REScheck Services in Westport, MA.

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REScheck Services

Professional REScheck Reports for New Construction, Additions & Renovations in Westport and the SouthCoast | IECC Compliance | Building Permit Ready

Accurate REScheck reports prepared by experienced, locally based insulation professionals
Serving Westport, MA and surrounding SouthCoast communities
Fast turnaround — permit-ready reports delivered electronically
Backed by 10+ years of hands-on insulation installation expertise in southeastern Massachusetts

If you are building a new home in Westport, adding on to an existing one, or undertaking a substantial renovation, your project almost certainly requires a REScheck compliance report before the Town of Westport Building Department will issue a permit. This is not optional, it is not a technicality, and it is not something to handle at the last minute.

Westport is located in IECC Climate Zone 5A — the same zone as the rest of Bristol County and the SouthCoast. Massachusetts has adopted the 2021 International Energy Conservation Code (IECC) with state-specific amendments, and Westport building permits for new residential construction and qualifying renovations require documented energy code compliance. REScheck is the accepted tool for providing that documentation.

At AFT Insulation Contractors, Inc., we prepare REScheck compliance reports that are accurate, permit-ready, and grounded in real insulation knowledge — not just software inputs. We are based in Freetown, MA, directly adjacent to Westport, and we work with Westport-area builders, contractors, architects, and homeowners every season. We know what the local building department expects and we prepare reports accordingly.

Call (774) 955-4113 to discuss your Westport project and get your REScheck started.

REScheck Services

What Is REScheck — And Why Does Your Westport Project Require One?

REScheck is a free compliance software tool developed and maintained by the U.S. Department of Energy (DOE). It was created specifically to help builders, contractors, designers, and homeowners demonstrate that a residential building project meets the energy efficiency requirements of the applicable residential energy code — in Massachusetts, that is the 2021 IECC with Massachusetts amendments, incorporated into the Massachusetts State Building Code (780 CMR 13.00).

A completed REScheck report documents all of the thermal envelope components of your building — walls, ceilings, floors, foundation, windows, doors, and skylights — and calculates whether the proposed assembly, taken as a whole, meets the minimum energy performance requirements for Westport’s climate zone. The completed report is submitted with your building permit application as evidence of compliance. Without it, your permit application is incomplete and the permit will not be issued.

What Projects in Westport Require a REScheck?

The following project types in Westport, MA typically require REScheck documentation for permit issuance:

New single-family home construction — this is the most common trigger. Any newly constructed conditioned residence requires energy code compliance documentation
Home additions that add conditioned (heated or cooled) square footage to an existing home
Substantial renovations involving changes to the thermal envelope — new windows replacing existing, new roof assembly with insulation changes, new exterior wall construction
Detached accessory structures being converted to conditioned living space or accessory dwelling units (ADUs)
New construction of in-law apartments, cottages, or guest houses on existing residential properties
Any project for which the Westport Building Department requests energy compliance documentation as a condition of permit issuance

If you are not certain whether your project requires a REScheck, call us before you submit your permit application. A brief conversation can save you the delay of a rejected submission.

What Happens If You Get It Wrong

There are two common failure modes with REScheck: submitting without one when one is required (your application comes back incomplete), and submitting an inaccurate one (the report shows passing values that do not reflect what will actually be installed).

The second problem is more serious. During the final building inspection, the inspector verifies that what was installed matches what was specified in the REScheck. If the actual insulation R-values, window U-factors, or other thermal envelope values differ from what the report documents — even if the installed values are technically compliant — the discrepancy can require field corrections, additional insulation, or window replacements. In a worst case, a stop-work order. All of this is avoidable with an accurate report prepared by someone who understands both the software and the actual materials being installed.

An accurate REScheck is not just a permit checkbox. It is the specification document that your insulation installer, window supplier, and Westport building inspector will all reference throughout the construction process.

Westport, MA Climate Zone and Energy Code Requirements

Westport, Massachusetts is located in IECC Climate Zone 5A. This is the climate zone for all of Bristol County, including the SouthCoast cities and towns immediately surrounding Westport — Fall River, Dartmouth, New Bedford, Freetown, Fairhaven, Acushnet, Somerset, and Swansea. Climate Zone 5A designates a cold climate with significant heating demand and moderate cooling demand, consistent with Westport’s coastal New England weather patterns.

Massachusetts adopted the 2021 IECC as its residential energy code, with state-specific amendments that in several cases are more stringent than the base IECC. The following minimum requirements apply to new residential construction in Westport under this code:

Minimum Requirements for Westport, MA — Climate Zone 5A (2021 IECC / Massachusetts)

Attic insulation (flat ceiling with attic above): R-49 minimum. Blown cellulose or blown fiberglass to the attic floor is the most common installation method. Spray foam applied to the underside of the roof deck (unvented hot roof assembly) must achieve equivalent thermal performance
Cathedral and sloped ceilings: R-49 continuous or equivalent compliant assembly. Spray foam is often the only practical way to achieve this in a limited rafter depth
Above-grade frame walls: R-20 cavity insulation alone, or R-13 cavity insulation plus R-5 continuous exterior insulation (foam sheathing). A 2×6 wall with R-21 batts or closed-cell spray foam to the appropriate depth typically meets or exceeds this requirement
Below-grade basement walls: R-15 continuous insulation, applied to the interior or exterior face of the foundation wall. This is one of the most commonly under-insulated assemblies in Westport-area new construction
Crawl space walls (unvented conditioned crawl spaces): R-15 continuous insulation
Slab-on-grade perimeter insulation: R-10, extending at least 2 feet vertically down the inside of the foundation wall or horizontally inward under the slab. Many Westport projects with slab foundations miss this requirement in permit documentation
Windows (fenestration): U-factor 0.30 or lower — this is the whole-window U-factor including the frame, as rated by the National Fenestration Rating Council (NFRC). Standard double-pane windows often do not meet this requirement; specifying low-e coatings and warm-edge spacers is typically required
Skylights: U-factor 0.50 or lower
Opaque exterior doors: U-factor 0.20 or lower
Air leakage: Maximum 3 air changes per hour at 50 Pascals (3 ACH50), verified by blower door testing at the rough-in and final inspections for new construction

These are the minimums required for code compliance. REScheck uses a whole-building trade-off calculation that allows components exceeding minimum requirements to offset components that fall short — which means a project with exceptional attic insulation may have more flexibility on wall assembly choices. We explain this trade-off approach in detail further below.

Why Westport’s Coastal Location Does Not Reduce Code Requirements

Some homeowners in coastal towns assume that proximity to the ocean — and the moderating effect of the water on extreme temperatures — reduces their insulation requirements. It does not. Climate zone assignments in the IECC are based on county-level heating degree day data, and Westport, as part of Bristol County, falls squarely in Zone 5A. The code requirements are identical to those applying to inland Bristol County communities.

What Westport’s coastal location does affect is moisture dynamics. Homes close to the water experience more humidity cycling and salt air exposure, which increases the importance of proper vapor management in wall and roof assemblies. This is a factor we account for when specifying insulation assemblies for Westport projects — particularly when recommending closed-cell spray foam, which provides both thermal performance and a vapor barrier.

What a Complete Westport REScheck Report Documents

A properly prepared REScheck for a Westport, MA project is not a matter of entering a few R-values into a form. Every input must accurately reflect the actual materials and assemblies proposed for the project. Here is what we document in every report we prepare, and why each component requires careful attention:

Attic and Ceiling Assemblies

Westport homes are built with a variety of ceiling configurations — flat ceilings with accessible attics, vaulted ceilings over living spaces, shed dormers, and combinations of all three in the same structure. Each distinct ceiling assembly requires separate documentation in the REScheck. We specify the insulation type (blown cellulose, blown fiberglass, batt, or spray foam applied to the roof deck), the installed depth, and the resulting R-value for each assembly. Attic access hatches, pull-down attic stairs, and knee wall doors are documented separately. Massachusetts code requires these penetrations to be insulated and air-sealed. They are frequently omitted from homeowner-prepared reports and flagged during inspections.

Above-Grade Wall Assemblies

Wall assembly documentation requires the most precision of any component in a Westport REScheck. We document the full assembly: framing dimension (2x4 or 2x6), framing factor (the proportion of the wall surface that is structural framing versus insulated cavity), cavity insulation type and R-value, and any continuous insulation applied to the exterior surface. The framing factor is a critical input that is frequently entered incorrectly in self-prepared reports. A typical wood-framed wall has a framing fraction of approximately 25% when accounting for studs, plates, headers, corners, and blocking. Entering zero framing — treating the wall as 100% insulated cavity — significantly overstates the wall's effective R-value and produces a report that passes on paper but understates actual heat loss. For Westport projects where AFT Insulation is installing spray foam in wall cavities, we document the foam type (open-cell or closed-cell), the installed thickness, and the R-value per inch specific to the product we are using — not a generic industry average.

Below-Grade Foundation and Basement Walls

Foundation insulation is one of the most significant heat loss pathways in a Westport home during winter. Many existing Westport homes have uninsulated or minimally insulated basements, and new construction must meet the R-15 continuous insulation requirement for below-grade walls. We document whether insulation is applied to the interior or exterior of the foundation wall, the material (foam board, spray foam, or batt with thermal break), and the R-value. For Westport projects with crawl spaces — common in older neighborhoods and on properties with irregular grades — we document whether the crawl space is conditioned or vented, and specify the insulation accordingly.

Slab-on-Grade Floors

New construction in Westport on slab foundations requires perimeter insulation meeting R-10 minimum, extending at least 2 feet down the inside of the foundation wall or inward under the slab. This requirement is frequently missed in permit submissions for Westport slab-on-grade projects. We document the insulation type (typically rigid foam board), the R-value, and the installation depth.

Windows, Doors, and Skylights

Window performance has a larger impact on REScheck compliance in Westport than many builders expect, particularly for homes with ocean-view orientations that include large glazing areas facing south or west. We document each window and door type separately using NFRC-rated U-factors from the manufacturer's data sheet or window schedule. Generic U-factors — 'standard double pane' — are not sufficient for permit submission. If window selections have not been finalized at the time of permit application, we document conservative (highest permissible) U-factor values that maintain compliance. The report is then revised when actual window specifications are confirmed before installation.

Air Leakage and Mechanical Ventilation

The 2021 IECC requires new residential construction in Westport to demonstrate a maximum air infiltration rate of 3 ACH50, verified by blower door testing. This requirement is documented in the REScheck and verified by the building inspector at both rough-in and final inspections. For projects using spray foam insulation — which dramatically reduces air infiltration compared to batt insulation — meeting this requirement is typically straightforward. For projects using batt insulation alone, achieving 3 ACH50 requires deliberate air sealing at all penetrations, top plates, rim joists, window and door rough openings, and electrical and plumbing penetrations. We document the proposed air infiltration rate based on the insulation strategy and air sealing approach planned for the project — not an optimistic assumption.

The REScheck Trade-Off Approach — Flexibility for Westport Projects

Most builders and homeowners who have encountered REScheck think of it as a prescriptive checklist: each component must meet its minimum R-value, and the project either passes or fails based on whether every box is checked. This is the prescriptive compliance path, and it is the simpler of the two options REScheck offers.

The trade-off compliance path is more powerful. REScheck calculates a maximum allowable UA value for your entire building envelope — UA stands for U-value (heat transfer per square foot) multiplied by area (square footage). This single number represents the total heat loss budget for your building’s thermal envelope. If your proposed assembly’s total UA is equal to or lower than the maximum allowed UA, the project passes — regardless of whether any individual component meets its prescriptive minimum.

This matters because Westport projects regularly present design constraints that the prescriptive path cannot accommodate cleanly:

A Westport home with a large south-facing window wall for ocean or harbor views will have high fenestration area that drives up the UA. Specifying high-performance triple-pane windows (U-0.20 or better) and adding additional wall insulation brings the total UA back into compliance without requiring the homeowner to sacrifice the view
A new Westport home with architectural features — a cathedral great room, exposed timber framing, or a custom ceiling assembly — may not accommodate R-49 in every ceiling section. Exceptional attic insulation elsewhere in the building, combined with high-performance windows, allows the total UA to remain compliant
A Westport coastal property with a design that limits exterior wall thickness (lot coverage rules, setback constraints, or historic district design guidelines) may not accommodate standard 2×6 framing with full cavity insulation. Exterior continuous foam insulation over 2×4 framing, or closed-cell spray foam achieving higher R-values in a thinner cavity, can meet the requirement in a narrower assembly
A project that uses spray foam throughout — with its superior air sealing performance — can claim credit for the air sealing benefit in ways that batt-insulated assemblies cannot, creating additional trade-off flexibility

Understanding and correctly applying the trade-off approach is where a professional REScheck preparer with real insulation knowledge adds value that an online form-filling service cannot. We have prepared compliant reports for Westport-area projects with complex design requirements that would have failed a simple prescriptive check.

How We Prepare Your Westport REScheck — Step by Step

Step 1 — Project Intake and Information Gathering

You contact us with the basics of your project: the Westport property address, the type of construction (new build, addition, renovation), the conditioned floor area, and any preliminary plans or specifications you have available. If you are working with an architect or designer, we can work directly from their drawings. If you are a homeowner managing the project yourself, we walk you through exactly what information we need.

We confirm the applicable climate zone (Zone 5A for Westport), identify the specific code requirements that apply to your project type, and flag any components where additional information will be needed before we can complete the report.

Step 2 — Assembly Review and Compliance Analysis

Before running the REScheck calculation, we review your proposed insulation assemblies against current Massachusetts code requirements. This is the step where problems get caught early — an attic insulation spec that falls short of R-49, a window U-factor that will not meet 0.30, a basement wall assembly that lacks continuous insulation.

When we identify a compliance gap, we do not simply flag it and hand it back to you. We suggest specific, practical solutions based on our knowledge of what insulation products and assemblies work in Westport-area construction. Often we can resolve a compliance issue with a relatively minor change to the specification — adding a layer of foam sheathing to an exterior wall, substituting closed-cell spray foam for batt insulation in a rim joist assembly — without significantly impacting project cost.

Step 3 — REScheck Report Generation and Compliance Verification

We enter all project data into the DOE REScheck Web software, verify every input against the project specifications, and run the compliance calculation. If the project does not pass on the first run using the prescriptive path, we apply the trade-off approach to find a compliant configuration that aligns with your design intent and budget.

We do not submit a report that does not reflect what will actually be installed. An inaccurate report that passes on paper is a liability — it creates inspection problems and potentially requires expensive field corrections after construction is underway.

Step 4 — Report Delivery

We deliver the completed REScheck report as a PDF formatted for permit submission, along with the REScheck data file (.xml) if required by the Westport Building Department. The report includes all documentation required for permit review: the project description and address, all envelope assembly specifications, the UA calculation summary, and the pass/fail determination clearly shown.

We also prepare a plain-language insulation specification summary — a document that translates the REScheck requirements into clear installation instructions for the insulation contractor (or for our own installation crew, when AFT is performing the installation).

Step 5 — Revision Support Through Permitting

Design changes happen during the permitting process. Window selections change, a wall assembly is revised, the architect adjusts the floor plan. When your project changes in ways that affect the thermal envelope, the REScheck must be updated. We provide revision support through the life of your permit application — a revised report when specifications change, a resubmission if the building department has questions, and coordination with your architect or builder if compliance issues arise.

REScheck Preparation and Insulation Installation — AFT Does Both

The vast majority of REScheck services are provided by third-party energy raters or online platforms that have no involvement in the actual insulation installation. They generate a compliant report based on the numbers you give them, issue the PDF, and their involvement ends. The disconnect between what the report specifies and what actually gets installed is the primary source of REScheck-related inspection failures.

AFT Insulation is different. We are an insulation contractor first. When we prepare your REScheck, the specifications we document are specifications we are prepared to install — or specifications we can verify will be correctly installed by the contractor performing the work. When AFT performs both the REScheck and the installation for a Westport project, here is what that means in practice:

Every R-value we document in the report is based on the actual product performance data for the materials we will install — not a generic industry assumption
The air sealing requirements documented in the report are met because we perform the air sealing as part of our installation process
The insulation installer knows exactly what the REScheck requires, because we prepared both documents
If the Westport building inspector has a question at rough-in or final inspection, we can provide direct technical support and documentation
You have one point of accountability from compliance documentation through installed insulation — not two separate companies pointing at each other when something does not align

Spray Foam Insulation and REScheck in Westport

AFT Insulation specializes in spray foam insulation — both open-cell and closed-cell — and spray foam has specific advantages in the Westport REScheck context. Closed-cell spray foam achieves R-6 to R-7 per inch of thickness, which means it can meet Massachusetts wall insulation requirements (R-20) in a 2×4 wall cavity with approximately 3 inches of foam — without requiring exterior continuous insulation or a wall thickness increase. This is particularly valuable in Westport renovation and addition projects where existing wall dimensions constrain the insulation assembly.

Closed-cell spray foam also provides a Class II vapor retarder, which is beneficial in Westport’s coastal climate where moisture management in wall and roof assemblies is important. When we specify closed-cell foam in a REScheck for a Westport project, we document the foam’s R-value per inch, the installed thickness, and the resulting total R-value with precision — not an approximation.

Open-cell spray foam, at R-3.5 to R-3.7 per inch, is the most efficient path to achieving R-49 in an unvented cathedral ceiling assembly in Westport homes with deep rafter bays. It provides excellent air sealing and completely fills the rafter cavity, eliminating the thermal bridging through framing that reduces the effective R-value of batt insulation installations.

REScheck Mistakes That Delay Westport Building Permits

We review a significant number of self-prepared and contractor-prepared REScheck reports that have errors. The following are the most common problems we see in REScheck submissions for Westport-area projects:

Incorrect Climate Zone Entry

Westport is IECC Climate Zone 5A. Using Zone 4 values significantly understates the R-value requirements. Using Zone 6 values over-specifies insulation unnecessarily and may create budget problems. The climate zone is determined by the project address and must be entered correctly. This seems obvious, but is one of the more common errors in reports prepared by out-of-area services.

Wrong Framing Factor for Westport Wall Assemblies

Wood-framed wall assemblies in typical Westport residential construction have a framing fraction of approximately 23–27% when all framing members are accounted for — studs at 16 inches on center, double top plates, sill plates, headers over openings, corners, and intersecting wall framing. Entering a framing factor of zero (treating the wall as all cavity) overstates the wall's thermal performance by approximately 10–15% for a typical 2x6 wall with R-21 batts. The whole-wall effective R-value of such an assembly is closer to R-17 to R-18, not R-21. This difference can tip a borderline project from passing to failing on careful inspection.

Using Nominal Rather Than Installed R-Values

Batt insulation products are rated at their nominal thickness. A batt rated R-21 is designed for a 5.5-inch 2x6 cavity at full thickness. If the batt is compressed — for example, if the stud cavity is slightly shallower than 5.5 inches due to inconsistent framing, or if wiring runs force the batt to be compressed against the sheathing — the actual R-value is lower than the nominal rating. We use installed R-values that account for real-world installation conditions.

Missing Rim Joist and Band Joist Documentation

The rim joist — the band of framing around the perimeter of each floor level — is one of the most significant thermal bypasses in a Westport wood-framed home. Uninsulated rim joists create a continuous cold bridge at each floor level. Massachusetts code requires rim joist insulation, and REScheck should document the assembly. Rim joists are among the most commonly omitted components in self-prepared reports and are one of AFT's most effective spray foam applications — a continuous bead of closed-cell foam completely fills and air-seals the rim joist cavity in a single step.

Generic Window U-Factors

Windows have an outsized impact on REScheck compliance, particularly for Westport homes with large amounts of glazing. Using a generic 'double-pane' U-factor of 0.35 or 0.40 for windows that need to meet a 0.30 maximum will fail. Actual NFRC-rated U-factors for the specific window product being installed must be used. For Westport projects where windows have not yet been selected at permit submission, we use 0.30 (the maximum allowed) as a placeholder — which forces the window selection to meet the code requirement when purchases are made.

Omitting Slab Perimeter Insulation

New construction in Westport on slab foundations requires R-10 perimeter insulation. This is missed in a surprising number of permit submissions for Westport slab projects. The insulation must extend at least 2 feet down the inside of the foundation wall or inward under the slab — and it must be documented in the REScheck for the report to be complete.

Not Addressing the Air Leakage Requirement Separately

The 3 ACH50 air leakage requirement is a mandatory provision of the Massachusetts energy code that applies alongside the insulation requirements documented in REScheck. A report that shows compliant insulation R-values but does not reflect a realistic air sealing strategy for the proposed construction type is incomplete. The blower door test at rough-in and final inspection will expose this gap if the installation does not deliver the assumed air tightness.

Who Works With AFT for REScheck Services in Westport

Westport Residential Builders and General Contractors

Builders working on new residential construction in Westport — whether single-family custom homes, spec homes, or subdivisions — work with us to get permit-ready REScheck documentation that accurately reflects the insulation specification for each project. For builders who use AFT for insulation installation, the REScheck and the installation are coordinated from the start, eliminating the disconnect between what was specified and what was installed that is the most common source of inspection problems.

Architects and Residential Designers Working in Westport

Architects and residential designers whose projects are located in Westport, MA engage us to verify that the proposed thermal envelope assemblies will meet Massachusetts energy code requirements before the permit drawings are finalized. Finding a compliance issue at the design stage — when specifications can be adjusted on a drawing — is dramatically less expensive than finding it during construction. We review proposed assemblies, identify any compliance concerns, suggest solutions, and prepare the REScheck documentation for inclusion in the permit package.

Westport Homeowners Managing Their Own Projects

Owner-builders in Westport undertaking new construction or substantial additions often find the REScheck process confusing and time-consuming. The DOE REScheck software is available for free, but knowing which inputs are correct, which assumptions are valid for Westport construction conditions, and what the Westport Building Department expects in the submission is not intuitive. We handle the full process: intake, compliance analysis, report generation, and delivery in the format required for permit submission. You receive a permit-ready document and a clear explanation of what insulation your project requires.

Real Estate Developers Building in Westport and Surrounding Communities

Developers building new residential units in Westport — whether single-family homes, multi-family structures under three stories, or mixed-use buildings with residential components — work with us for REScheck services across all unit types. We provide consistent documentation quality and fast turnaround that supports efficient permitting across multiple units or phases of development.

REScheck Compliance vs. Real Energy Performance in Westport Homes

This is a distinction worth making clearly. A Westport home that passes REScheck meets the minimum energy efficiency requirements of Massachusetts law. It will be more energy-efficient than a pre-code home, and it will be significantly more efficient than an older Westport home with no insulation or outdated insulation. But minimum code compliance is not the same as high performance.

A home built to the bare prescriptive minimums of the 2021 IECC in Westport — R-49 attic, R-20 walls, R-15 basement, U-0.30 windows — will have annual heating and cooling costs that are noticeably higher than a home built to a higher performance standard such as ENERGY STAR for New Homes, DOE Zero Energy Ready Home, or Passive House. The difference is real, measurable, and compounding over the life of the building.

What This Means for Your Westport Project

When we prepare a REScheck for a Westport project, we always have a conversation about the client’s goals. If the goal is simply to obtain the permit with a compliant specification, we prepare a report that meets code minimums efficiently. If the goal is a genuinely high-performance home with substantially lower energy bills, better comfort, and a smaller carbon footprint, we can design an insulation specification that significantly exceeds code minimums — and prepare a REScheck that documents those higher-performance assemblies.

The incremental cost of upgrading from code-minimum insulation to a high-performance specification is almost always smaller than homeowners expect. Going from R-49 to R-60 in the attic with blown cellulose is a marginal cost difference. Upgrading from U-0.30 to U-0.22 triple-pane windows on a Westport home with significant south-facing glazing can meaningfully reduce heat loss and solar heat gain variability. We can quantify these differences in real terms and help you make an informed decision.

Mass Save Rebates for Westport Homeowners

Mass Save — the statewide energy efficiency program administered by Eversource, National Grid, and other Massachusetts utilities — provides rebates for insulation upgrades in existing Westport homes, and incentives for new construction that exceeds code minimums. While REScheck compliance is required for permit purposes, insulation levels above code minimums may support eligibility for Mass Save rebates and the Mass Save Heat Loan program (0% financing for qualified energy efficiency improvements). We can advise on how your Westport project’s insulation specification relates to Mass Save eligibility.

Why Westport Property Owners Choose AFT Insulation for REScheck Services

We Are Local — Based Minutes From Westport

AFT Insulation is based in Freetown, MA — directly adjacent to Westport, in the same part of Bristol County. We are not a national online service or an out-of-state energy consulting firm. We work in Westport and the surrounding SouthCoast communities every week. We know the local building stock, the local building department's documentation expectations, and the local contractors who will be executing the insulation specifications we document in the report.

Real Insulation Knowledge Behind Every Report

Every REScheck we prepare is informed by more than 10 years of hands-on insulation installation experience. We know how spray foam, blown cellulose, fiberglass batts, and rigid foam board actually perform in southeastern Massachusetts building assemblies. We know the field conditions that affect installed R-values, the air sealing details that matter for blower door performance, and the product specifications that will hold up under inspection. This knowledge informs every input in every report we prepare.

We Serve Westport from Permit to Installation

For Westport homeowners and builders who want a single point of accountability, we provide both the REScheck and the insulation installation. The specification in the report is the specification we install. There is no translation gap, no coordination friction, and no blame-shifting when the building inspector arrives. The job passes because we designed it to pass and then installed it exactly as designed.

Transparent, Direct Communication

If your Westport project has a compliance challenge — an architectural feature that complicates the thermal envelope, a budget constraint that creates tension with code requirements, a design that requires careful trade-off analysis — we tell you directly and work through the options with you. We do not prepare reports that pass on paper but fail in the field, and we do not use REScheck as a sales tool to push you toward more expensive insulation systems than your project requires.

Fast Turnaround for Westport Permit Submissions

REScheck preparation is often on the critical path for building permit applications. A delayed report means a delayed permit means a delayed construction start. We provide fast turnaround — typically 2–3 business days for straightforward new construction projects — and same-day or next-day turnaround for revisions on projects already in progress.

When You Hire AFT Insulation Contractors, You Get Experience, Knowledge, Quality and Commitment

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FAQ

Frequently Asked Questions

Does every new home built in Westport require a REScheck?

Yes. New single-family residential construction in Westport, MA is subject to the Massachusetts State Building Code (780 CMR), which incorporates the 2021 IECC residential energy code requirements. REScheck is the accepted compliance documentation tool for the Westport Building Department. Your permit application will not be complete without it.

My project is an addition to an existing Westport home. Do I need a REScheck?

In most cases, yes. Additions that add conditioned square footage require energy compliance documentation. The REScheck for an addition typically covers the new addition only — the existing structure is generally grandfathered unless you are making changes to the existing thermal envelope (replacing windows, re-insulating existing walls, etc.). We assess your specific project scope and determine exactly what the REScheck needs to cover.

How long does it take to get a REScheck for a Westport project?

For a straightforward new construction project in Westport with complete plans and specifications, we typically deliver the permit-ready report within 2–3 business days of receiving all required information. For projects with incomplete specifications or complex assemblies, we discuss the timeline during intake. Revisions to existing reports are typically completed same-day or next-day.

What information do I need to provide?

At minimum: the Westport property address, the type of construction (new build, addition, or renovation), conditioned floor area, ceiling heights, proposed insulation R-values for each assembly (attic, walls, basement, slab), and window and door specifications including U-factors. If you have architectural drawings, those are the most efficient way to convey this. We follow up with questions on anything not covered in the initial submission.

Can the REScheck be revised if we change window specifications or wall assemblies after submission?

Yes, and this is common. Window selections often change during the permitting or purchasing process. If a design change affects the thermal envelope — new window U-factors, a revised wall assembly, a change to the ceiling configuration — the REScheck must be updated. We provide revision support through the life of your permit application and into construction if needed.

Does a passing REScheck mean my Westport home will be energy-efficient?

It means the home meets the minimum energy efficiency requirements of Massachusetts law — which is a meaningful baseline. Whether the home is genuinely energy-efficient depends on whether the specifications in the REScheck are correctly installed in the field, and whether the homeowner chose to exceed code minimums in any assemblies. A home built exactly to code minimums will be more efficient than most existing Westport homes, but not as efficient as a home built to a higher performance standard. We are happy to discuss what a higher-performance specification would look like for your project.

What does a REScheck cost?

The cost depends on the complexity of the project — the number of distinct assemblies, whether the design requires trade-off analysis, and the extent of revision support needed during permitting. Contact us at (774) 955-4113 for a quote based on your Westport project. For projects where AFT is also performing the insulation installation, REScheck preparation is included as part of the overall project scope.

Can I prepare the REScheck myself?

The DOE REScheck Web tool is free and publicly available. Homeowners and builders can prepare their own reports. The challenge is knowing which inputs are correct for Westport’s construction conditions, applying the right framing factors, using verified window U-factors, and producing a report formatted to the Westport Building Department’s expectations. Errors in self-prepared reports are common, and the cost of fixing a compliance failure found at inspection is always higher than the cost of a professionally prepared report. We are happy to review a self-prepared report and identify any issues before submission.

Does AFT provide REScheck for commercial buildings in Westport?

REScheck is a residential-only compliance tool — it covers single-family homes and low-rise multifamily residential construction up to three stories above grade. Commercial buildings and mixed-use commercial projects use different compliance software (COMcheck). AFT Insulation’s expertise is in residential construction; contact us to discuss your project type and we will advise on the appropriate compliance pathway.

What is the difference between REScheck compliance and a HERS rating?

REScheck is a pass/fail code compliance tool. A HERS (Home Energy Rating System) rating is a quantified measure of a home’s overall energy performance, expressed as a number on a scale where 0 is net-zero energy and 100 is the code-reference home. REScheck is required for building permits in Westport. A HERS rating is required for some incentive programs (ENERGY STAR for New Homes, DOE Zero Energy Ready Home) and can support Mass Save rebate applications. They serve different purposes and are not interchangeable.

Start Your Westport, MA REScheck Today

Do not let energy compliance documentation hold up your Westport building permit. AFT Insulation Contractors prepares accurate, permit-ready REScheck reports for residential construction projects throughout Westport and the SouthCoast — backed by the same hands-on insulation expertise we bring to every installation job we complete in this community.

We are based minutes from Westport. We know the local building requirements. We prepare the report, and when needed, we install the insulation. Call us today.