Stretch Code Permits in MA: Read the Town's Tier

TL;DR

• The same new-build permit is not worth the same in every MA town.
• A town's energy tier, base, stretch, or specialized, sets the mandatory spec by law.
• A specialized-code permit guarantees heat-pump heat, an electrification-ready panel, and EV-ready parking.
• Read the tier next to the permit to pre-score the electrification scope before you call.

A new-construction permit in Massachusetts is not worth the same in every town. The deciding factor is the energy code the town has adopted, because that tier sets what the building must contain by law, not by the owner's taste. A new house or ADU permit in one of the 60 specialized-code towns is electrification-bound: heat-pump heating, a heat-pump or electric water heater, an electrification-ready electrical panel, and EV-ready parking are mandatory. The same permit in a base-code town carries none of those guarantees. Read the town's tier next to the permit and you have pre-scored the spec, the trades, and the budget before anyone picks up the phone.

Almost every stretch-code article online explains the rule to homeowners and builders. None of them teach a lead-miner to use the town's energy tier as a scoring signal. That gap is the opportunity.

What the Massachusetts stretch code actually is

Massachusetts runs three energy-code tiers, and a city or town is on exactly one of them. The base code is the 10th edition of the state building code, which incorporates the 2021 IECC plus state amendments under 780 CMR. The stretch code, 225 CMR 22.00, is an opt-in code that beats the base by roughly a fifth in performance. The specialized code, 225 CMR 23.00, is a stricter opt-in tier built around electrification and a high-performance building envelope.

The adoption map is lopsided toward the stronger codes. As of June 2026, 242 of the state's 351 cities and towns have adopted the stretch code, covering about 59% of all residents. Sixty of those communities have gone further and opted into the specialized code, which alone covers roughly a third of the state's population. Boston, Cambridge, Somerville, Brookline, Newton, and Watertown are on the specialized tier. The Department of Energy Resources, DOER, administers the codes and keeps the current adoption list by municipality.

This is live, not settled. DOER opened a public comment window on proposed updates to both codes this spring, with a hearing on June 16, 2026 and written comments accepted through June 24. The tiers are not going away, and the direction is toward more electrification, not less.

Why a town's energy tier is a lead signal

Here is the part the homeowner-facing articles never reach. A permit is a signal about the homeowner, not the contractor, and the town's energy tier tells you what that homeowner is legally required to build. The owner did not choose the heat pump out of preference. In a specialized-code town, the code chose it for them.

That changes how you score two otherwise identical permits. A new single-family permit in Newton and a new single-family permit in a base-code town an hour west look the same on a lead list. They are not the same lead. The Newton build must run heat-pump heat, an electrification-ready panel, and EV-ready parking by code. The base-code build can still be a gas furnace, a 100-amp panel, and no charger rough-in. The first permit is a guaranteed multi-trade electrification job. The second is a coin flip.

So the energy map does work that a raw permit feed cannot. It pre-sorts new-construction and ADU records by the spec the town forces, before you spend a dollar of outreach budget.

What a specialized-code permit guarantees about the job

A specialized-code new-construction permit is the highest-confidence electrification signal in the data, because the code spells out the build. Compliant homes use heat pumps for space heating and a heat-pump or electric water heater. An all-electric path is the clean route. The mixed-fuel path is allowed but penalized: any home that keeps a fossil-fuel appliance has to be wired for future electrification, meaning every gas appliance gets a dedicated circuit and reserved panel space so it can be swapped to electric later without a rewire, and the home has to add on-site solar and EV-ready parking.

The practical read for a lead-miner is that a specialized-code build delivers a known stack of work. The heating is a heat pump. The panel is sized with electrification headroom, which often means a 200-amp service and a service-upgrade electrical permit under 527 CMR 12.00. The parking is roughed for a charger. Large multifamily buildings over 12,000 square feet face an even higher bar, the Phius passive-house standard, which adds deep envelope and air-sealing scope.

The stretch code is softer but still meaningful. It does not mandate all-electric, but it tightens insulation, fenestration, and air-sealing well past the base code, which raises the spec on windows, doors, and the building shell. A stretch-code permit is not a guaranteed heat-pump job, but it is a guaranteed better-envelope job.

Stretch, specialized, or base: the permit-value map

The fastest way to use this is to score every new-construction and ADU permit by the tier of the town it sits in. Same permit type, three different jobs.

Factor	Base-code town	Stretch-code town (225 CMR 22.00)	Specialized-code town (225 CMR 23.00)
MA communities (June 2026)	~109 of 351	242 adopted stretch or stronger	60 of the 242
Heating system	Owner's choice (often gas)	Owner's choice, tighter envelope	Heat pump required
Water heater	Any	Any	Heat-pump or electric
Electrical panel	As designed	As designed	Electrification-ready reserve
EV parking	Optional	Optional	EV-ready required
On-site solar	No	No	Required on mixed-fuel builds
Envelope spec	Base IECC 2021	~20% better than base	High-performance, near net-zero
Lead value	Variable, verify the systems	Reliable envelope and window scope	Guaranteed all-electric, multi-trade

The table is the shortcut. You do not need to call the owner to know a specialized-code new build is an electrified, multi-permit job. The town's code already told you.

Which trades the energy code feeds

The tier does not just predict whether a heat pump is coming. It predicts who else gets pulled onto the address.

The HVAC contractor is the clearest winner in a specialized-code town, because the heat pump is mandatory, not optional, and a co-filed mechanical permit confirms it. The electrician follows close behind: an electrification-ready panel, the dedicated circuits behind every reserved gas line, and the EV-ready rough-in are all 527 CMR 12.00 work. The EV-charger installer inherits a parking space already roughed for Level 2 service, which turns a future charger sale into a near-certain follow-on.

The envelope trades read the stretch tier even when there is no heat pump. The windows and doors specialist supplies the higher-spec fenestration the stretch code demands, and insulation and air-sealing crews get tighter targets to hit. An all-electric home with a heat pump is also a candidate for a Mass Save rebate, so a builder weighing the systems is reading the same 2026 Mass Save rebate changes that decide the homeowner's out-of-pocket cost. One permit, sorted by one town's tier, can feed five trades.

New construction, additions, and where the code bites

The full specialized package lands on new construction, and a new ADU counts as new construction, which is why the 2026 ADU wave and the specialized map reinforce each other. An accessory dwelling built in a specialized-code town is an all-electric, heat-pump, EV-ready unit by default, on top of being a funded, permit-first lead.

Additions and alterations are a softer signal, and this is where it pays to be precise rather than to overclaim. An addition or renovation does not trigger the whole new-construction package. It triggers the energy code's envelope rules when it creates or converts conditioned space, which means insulation, fenestration, and air-sealing review on the new or changed area. A heated addition in a stretch or specialized town is still a higher-spec job than the same addition in a base town, just not a guaranteed all-electric one. So weight new-build and ADU permits first, and treat conditioned additions as the second tier of the signal.

Timing follows the build, not a repair clock. New construction runs months from permit to finish, so the planning window is long and the trades behind the heat pump and the panel are unbooked early. Work the record in Weeks 1 to 8 after filing, while the new single-family pipeline is still open to subs and suppliers.

How to read the energy-code map in your outreach

Start by tagging every new-construction and ADU permit with its town's tier. The 60 specialized-code communities are your top pool, because the electrification scope is guaranteed and the trade list is long. The stretch-code towns are your second pool, strong for envelope and window work. Base-code records still matter, but you verify the systems instead of assuming them.

Then lead with the spec the town forces. A note that says you saw the new build going in on their street, and that a specialized-code home in that town runs a heat pump and an electrification-ready panel, reads as someone who knows the local code, not as a blind mailer. Naming the tier is the local-awareness move, because building and electrical permits are public record in Massachusetts and the town's energy code is public policy.

The whole advantage is that the energy map sorted the leads before you touched them. You spend outreach on the guaranteed electrification jobs and let the unscored permits go to whoever is mailing the same flyer to every address in the county.

Want to score permits by their town's energy tier? Download the free 2026 Massachusetts permit data to see what is already on the record, and set up daily permit alerts so a new build or ADU in a specialized-code town reaches you within 24 hours of filing, early in the Weeks 1–8 window when the heat-pump and electrical trades are still up for grabs.