Site Plan Review Reform: What the Proposed Changes Would Do

Site plan review is one of the most common local approvals in Massachusetts, yet the state Zoning Act (Chapter 40A) has never actually defined it. Communities have built their own versions over decades, and courts have filled in the rules case by case. Legislation filed in 2026 would change that.

What’s proposed

In April 2026, the Governor filed an economic development bill, the “Mass Wins Act” (H.5386), that includes a section codifying site plan review. As filed, it would:

• Define site plan review in Chapter 40A as review of a project’s layout, safety, and impacts against reasonable performance standards.
• Put the rules in the bylaw. All substantive requirements, including application requirements and performance standards, would have to be written into the zoning bylaw or ordinance itself rather than in separate regulations.
• Rule out aesthetics. Performance standards could not be used to regulate building aesthetics.
• Set a deadline. A decision would be required within 90 days of a complete application, or the plan would be constructively approved (with an exception when it’s reviewed together with a special permit by the same board).
• Require a simple majority vote for approval.
• Allow administrative review. Communities could let designated staff approve site plans without a public hearing.
• Limit conditions. Conditions would have to be necessary to ensure compliance with the bylaw, couldn’t exceed what the bylaw expressly regulates, couldn’t intrude on another board’s jurisdiction, and off-site conditions would have to be proportionate to the project’s actual impacts.
• Narrow the grounds for denial to failure to meet the bylaw’s requirements or to submit required fees or information.

Where it stands

Economic development legislation typically changes as it moves through the House and Senate, and a similar stand-alone site plan review bill was filed in the previous session. Check the bill’s current status before relying on any specific provision. We’ll update this entry as it moves.

Why it matters

For project teams, the proposal would mean more predictable timelines, clearer standards, and limits on conditions that go beyond what the bylaw requires. For communities, it would likely mean revisiting site plan review bylaws so they hold up under the new framework.

Whatever happens with the bill, the practical lesson is the same: read your community’s site plan review provisions closely before you file, including any regulations adopted outside the bylaw.

This entry summarizes legislation as filed. It’s general information, not legal advice.