Boston Net Zero Carbon Zoning (Article 37) Help

Who Boston Net Zero Carbon Applies To

Boston Net Zero Carbon (NZC) is part of Zoning Article 37. It covers new buildings with 15 or more units or 20,000 sq ft or more, and additions of 50,000 sq ft or more, that go through Article 80 review. Multifamily, office, retail, school, lodging and similar buildings must open with net zero operating emissions. Labs, hospitals and manufacturing get phased timelines.

Written by Dominic Zammuto, RESNET-certified HERS Rater (#3385643) and Phius Certified Verifier, Multifamily Qualified (Phius ID 124235). Checked against Boston Planning Department sources in November 2026. Zoning changes often, so confirm with the city or town before you design.

Project	Covered?
New building with 15 or more residential units	Yes
New building of 20,000 sq ft or more	Yes
Addition of 50,000 sq ft or more	Yes
Renovations	No (exempt)
Additions under 50,000 sq ft	No (exempt)
Change of use	No (exempt)

Ways to Reach Net Zero Carbon

Efficient, all-electric design

The cheapest ton of carbon is the one you never emit. An all-electric or very efficient low-carbon building needs far fewer offsets every year.

On-site renewables

Rooftop solar, solar thermal or wind on the building reduce the emissions you have to cover.

Off-site clean power

Power purchase agreements, Boston Community Choice Electricity and Massachusetts Class I RECs can cover the rest.

Alternative compliance payment

Emissions that are left over can be covered with a payment of $234 per ton of CO2.

Passive House and the Specialized Code path cut operating energy the most, so they shrink the yearly offset bill. Boston is a Specialized Code city, so residential buildings over 12,000 sq ft already have to use the Passive House path. See Specialized Code requirements.

What You File and When

Boston still requires LEED certifiable design under Article 37. Net Zero Carbon adds to it; it does not replace it.

Stage	What Boston asks for
Project Notification Form (PNF)	Energy model, Climate Resilience Checklist, LEED checklist and a preliminary embodied carbon analysis
Board approval	Net Zero Carbon Acknowledgement Letter
Building permit	Updated energy model, embodied carbon analysis, Climate Resilience Checklist and LEED checklist
After occupancy	Annual reporting through BERDO, with third-party data verification by May 15 after the first full calendar year

How We Help in Boston

Check the rules before design is locked

We read the Boston requirement against your plans early and pick the cheapest pathway that passes.

Energy modeling

Our Certified Passive House Consultant models the building early so the energy model you file with the PNF is realistic and the yearly emissions, and any offset cost, are known before you commit.

Documents for permits and review

We prepare the energy code paperwork for the building department and the energy numbers your architect or permitting team needs. HEEC does not do LEED; if your project needs LEED, your LEED consultant handles that part.

Testing and verification

We do the inspections, blower door and duct leakage testing and final verification with our own crew as a RESNET HERS Rater and Phius Certified Rater and Verifier (Multifamily Qualified).

More: Net zero and Passive House rules in other Massachusetts cities · Phius Passive House verification · Multifamily HERS, ENERGY STAR and Phius

FAQ: Boston Net Zero Carbon Zoning

What projects need to meet Boston Net Zero Carbon?

New buildings with 15 or more residential units or 20,000 sq ft or more, and additions of 50,000 sq ft or more, that go through Article 80 review. Renovations, smaller additions and changes of use are exempt.

Does a building have to be all-electric to meet Boston NZC?

Not strictly. You can use efficient low-carbon design, on-site or off-site renewables, clean power purchases, Class I RECs or an alternative compliance payment of $234 per ton. All-electric, efficient buildings need the fewest offsets.

Is LEED still required in Boston?

Yes. Article 37 still requires projects to be LEED certifiable. Net Zero Carbon is an added requirement.

How is Net Zero Carbon checked after the building opens?

Through BERDO. The building reports emissions every year, with third-party verified data due by May 15 after its first full calendar year.

Does Passive House help with Boston Net Zero Carbon?

Yes. A Passive House building uses much less energy, so it needs less renewable power or offset payments to reach net zero each year. Boston is also a Specialized Code city, where residential buildings over 12,000 sq ft must use the Passive House path.

Sources: Boston Planning Department, Article 37 Green Building and Climate Resiliency.