Reading MA Density Waiver: LEED, Passive House, Net Zero

How the Reading Density Waiver Works

In Reading's Downtown Smart Growth District, extra density is granted by waiver from the Community Planning and Development Commission (CPDC) under Section 10.5.12, on a tiered schedule up to 50 units per acre. Every waiver project must achieve high performance building design: LEED Certified, Passive House, Net Zero or an equivalent rating system. The MBTA Communities amendments raised the district from 20 to 35 units per acre, and the Attorney General approved them. The Apartment 80 District allows up to 30 units per acre. The waiver tiers were written when the limit was 20, so they start at 21 units per acre; in practice a waiver matters for projects above 35. Confirm with Reading planning staff before you design.

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

Density	What you provide
Up to 35 units per acre	Allowed under the MBTA Communities upzoning (the tiers below were written when the limit was 20)
21 to 25 units per acre (Tier 1)	High performance building, plus at least one: open space and private amenity space, commercial space of 12.5% or more of gross floor area, 2 visitor parking spaces, or historic preservation
26 to 40 units per acre (Tier 2)	Tier 1, plus one more from a different category: 10% open space (or payment in lieu), 15% commercial space, added parking, or historic preservation
41 to 50 units per acre (Tier 3)	Tier 2, plus one more from a new category: 15% open space (or payment in lieu), 25% commercial space, deeper affordability, or shared parking

What Counts as High Performance Design

LEED Certified

Designed to the LEED Certified level. HEEC does not do LEED, so this route needs a LEED consultant. The other three routes we handle in house.

Passive House

Phius or PHI design. Our Certified Passive House Consultant models it and we verify it as a Phius Certified Verifier.

Net Zero

A building designed to make as much clean energy as it uses over a year, usually all-electric with solar.

Or equivalent

The bylaw also accepts an equivalent rating system. ENERGY STAR Multifamily New Construction with a low HERS score is a common way to document performance; ask the CPDC early whether it will accept your choice.

The bylaw also asks that the design beat the minimum energy code, keep utility and maintenance costs low for residents and leave room for future clean energy upgrades. Reading is not one of the Specialized Code towns, so the Specialized Code Passive House trigger does not apply there; the waiver is what brings in the high performance standard.

How We Help in Reading

Check the rules before design is locked

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

Energy modeling

We run the energy model that shows the building beats code and meets the standard you choose, so the CPDC has numbers to approve the waiver.

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: Reading Density Waiver

How many units per acre are allowed in Reading's Downtown Smart Growth District?

35 units per acre. The MBTA Communities amendments raised it from 20, and the Attorney General approved them. Above that, the CPDC can grant a density waiver under Section 10.5.12, up to 50 units per acre, and every waiver project must use high performance building design.

Who approves a density waiver in Reading?

The Community Planning and Development Commission (CPDC), under Section 10.5.12 of the zoning bylaw.

Does a Reading density waiver require Passive House?

Not specifically. It requires high performance building design to the LEED Certified, Passive House, Net Zero or an equivalent standard. Passive House is one of the choices.