REScheck & COMcheck Williamsburg MA - Quick Facts
Local energy code in Williamsburg
- New construction and major renovations in Williamsburg follow the Massachusetts Stretch Energy Code. IECC Climate Zone 5A.
- Massachusetts has three energy-code levels - base (2021 IECC), Stretch, and Specialized (Opt-In) - and Williamsburg is on the Stretch Code.
REScheck & COMcheck in Williamsburg
- REScheck documents the prescriptive residential path for Williamsburg additions, alterations and renovations (from $300); new-construction performance projects use a full HERS energy model instead.
- Commercial projects use COMcheck for the prescriptive path (from $600); larger new commercial buildings need third-party performance certification under the Stretch Code.
- 24-48 hour turnaround - documentation ready to upload with your Williamsburg permit application.
What you can get back: 2026 Mass Save
- All-electric renovations and additions can earn Mass Save incentives up to $20,000 (Level 1) or $30,000 (Level 2) for a single-family home, verified by a RESNET-certified HERS rater.
RESNET-certified · 15,000+ ratings completed · 5.0 stars across 136 Google reviews · (617) 501-6788
REScheck & COMcheck Williamsburg MA
Home Energy Efficiency Consultants prepares REScheck (residential) and COMcheck (commercial) compliance documentation for Williamsburg projects. When your build does not trigger a full HERS rating, these DOE compliance reports are the fast, affordable path to your permit.
What we deliver
A stamped, signed compliance report matched to your plans and ready to upload with your Williamsburg building permit application.
REScheck vs. COMcheck: What’s the Difference?
REScheck and COMcheck are DOE-developed programs that show a building meets the IECC energy code. Which one your Williamsburg project needs depends on whether the work is residential or commercial — here is how they differ.
What is a COMcheck?
For commercial and four-plus-story residential buildings, COMcheck is required. It documents envelope, lighting, and mechanical compliance against the IECC or ASHRAE Standard 90.1 and produces the certificates a commercial plan reviewer expects.
What is a REScheck?
For homes, REScheck is the go-to. This DOE program checks residential envelopes — detached houses and multifamily up to three stories — and allows insulation and fenestration trade-offs to show prescriptive or component-based IECC compliance.
REScheck Projects in Williamsburg
REScheck is the simplest path for smaller residential projects in Williamsburg that do not trigger a full performance-path energy rating. It is typically the right tool when your project is:
- New residential construction or an addition under 1,200 square feet that does not require a HERS rating
- Permit applications needing residential envelope documentation on the prescriptive or UA trade-off path
- Additions, alterations, or renovations to a one- or two-family home
- Projects where insulation and window trade-offs are enough to demonstrate compliance
- Detached accessory structures with conditioned space
Commercial Work That Needs a COMcheck in Williamsburg
COMcheck is required for commercial and larger projects in Williamsburg. Reach for a COMcheck when your project involves:
- Envelope work on commercial structures requiring IECC or ASHRAE 90.1 compliance
- Commercial buildings — offices, retail, restaurants, warehouses, and mixed-use
- Tenant fit-outs and interior or exterior lighting alterations
- Medical, dental, and professional office construction
- Warehouse, industrial, and light-manufacturing conditioned spaces
Inside Your REScheck or COMcheck Report
COMcheck report
The COMcheck Envelope, Lighting, and Mechanical Compliance Certificates plus the Plan Review Checklist — the full package a commercial plan reviewer expects for permit submission.
Fast, permit-ready turnaround
We deliver documentation ready to upload with your building permit application, and we answer plan-review questions if the department asks for revisions.
Plans matched to code
We enter your assemblies, fenestration, and (for commercial) lighting and mechanical details exactly as designed, so the report reflects what you are actually building in Williamsburg.
REScheck report
A signed REScheck compliance certificate matched to your plans, the inspection checklist, and the UA trade-off summary showing your insulation R-values and window U-factors meet the residential energy code.
Serving Williamsburg and Hampshire County
Williamsburg sits in Hampshire County, Massachusetts, in IECC climate zone 5A — the cold-climate zone that drives the insulation and air-sealing levels your REScheck or COMcheck must document. We prepare compliance reports for projects throughout Hampshire County, matched to the code edition Williamsburg currently enforces.
What a REScheck or COMcheck Costs in Williamsburg
Transparent starting prices. Final cost depends on project size, number of assemblies, and scope.
- REScheck (residential): starting at $300
- COMcheck (commercial): starting at $600
- Revisions to match plan-review comments are handled promptly
REScheck reports start at $300 and COMcheck reports start at $600 for projects in Williamsburg. Send your plans for an exact quote.
Trusted by Williamsburg Builders & Owners
Google Review
“Best decision I made was hiring Home Energy Efficiency Consultants LLC. Their attention to detail and willingness to answer all my questions made the process stress-free.”
Need a REScheck or COMcheck in Williamsburg?
Send us your plans and we will tell you which report you need and get it back to you fast — ready for your Williamsburg permit.
Email Energyconsultants01@gmail.com Call 617-501-6788HERS Ratings Across Williamsburg and Nearby Communities
Home Energy Efficiency Consultants rates new homes, additions, and major renovations throughout Williamsburg — including Williamsburg Center, and Haydenville. Every Williamsburg project is filed with the Town of Williamsburg Building Department, and we handle the energy model, blower door and duct leakage testing, and the compliance paperwork from start to finish.
We also serve the communities right around Williamsburg, including Northampton, Easthampton, Goshen, Whately, and Hatfield. Our Marlborough office at 272 Lincoln St is the closest of our four Massachusetts locations — see our Marlborough office or call (617) 501-6788 to get a Williamsburg rating on the schedule.
Williamsburg Specialized Energy Code — HERS Index Targets
Williamsburg enforces the Massachusetts Specialized (Opt-In) Energy Code. The required HERS score depends on fuel type and project scope — a lower index is stricter.
| Project type | Mixed-fuel | Mixed-fuel + solar | All-electric | All-electric + solar |
|---|---|---|---|---|
| New construction | HERS 42 | 42 | 45 | 45 |
| New construction — embodied-carbon credit | 45 | 45 | 48 | 48 |
| Accessory dwelling unit (ADU) | 52 | 55 | 55 | 58 |
| Major alteration / renovation / change of use | 65 | 70 | 70 | 75 |
A HERS rating is triggered by new construction, additions over 1,000 sq ft (or more than 100% of the existing conditioned area), and Level 3 alterations over 1,000 sq ft affecting more than 50% of the home. New homes must also pass a blower-door test at 3.0 ACH50 and include electrification-ready wiring for heat pumps, EV charging, and solar. We model your Williamsburg project up front so you know the exact target and the fastest path to hit it — call (617) 501-6788.
More Massachusetts Towns We Serve
Certified HERS ratings, blower door testing and energy code compliance across all 351 Massachusetts cities and towns.
