Massachusetts permit requirements

We have read and dated 23 permit rules across 2 jurisdictions in Massachusetts. They do not all say the same thing: shed thresholds alone run from 120 to 200 sq ft across 2 of them.

Jurisdictions: 2
Verified rules: 23
Permit always required: 13
Depends on the project: 8

Do you need a building permit in Massachusetts?

Usually yes, but not from Massachusetts itself: permits are issued by the city or county, not the state, so the rule that governs your project is the one your own jurisdiction publishes. 13 of those local rules require a permit outright, 8 depend on a size or scope condition the office publishes, and 0 need none. Massachusetts sets the building code those local rules derive from; your city or county sets the threshold and the fee.

Do Massachusetts jurisdictions agree?

Every row below is a measurement at least two Massachusetts jurisdictions publish, compared against each other. This is the question a statewide answer cannot settle, because the number that governs your project is the one your own city or county publishes.

Project	Published threshold	Jurisdictions	Agreement
Shed	120 to 200 sq ft	2	2 different numbers
Fence	6 to 7 feet	2	2 different numbers
Deck	200 sq ft	2	Same number in all 2

1 of 3 comparable measurements is uniform across Massachusetts; 2 are not. Latest verification 2026-08-15.

Where Massachusetts jurisdictions split

The verdict for each project across the 2 Massachusetts jurisdictions we cover. On 1 of 12 projects they do not give the same answer, which is why a statewide answer is not one.

Project	Permit required	Depends	Across the state
Pool	1	1	Answer varies
Deck		2	Same answer everywhere
Electrical	2		Same answer everywhere
Fence		2	Same answer everywhere
HVAC	2		Same answer everywhere
Plumbing	2		Same answer everywhere
Roof Replacement	2		Same answer everywhere
Shed		2	Same answer everywhere
Solar	2		Same answer everywhere
Bathroom Remodel		1	Same answer everywhere
EV Charger	1		Same answer everywhere
Water Heater	1		Same answer everywhere

Building without a permit in Massachusetts

Violation of the state building code is a criminal matter under M.G.L. c. 143, s. 94: punishable 'by a fine of not more than one thousand dollars or by imprisonment for not more than one year, or both, for each such violation,' and 'Each day during which a violation exists shall constitute a separate offense.' The code itself hooks into this: 780 CMR 114.4 (10th edition) makes anyone who violates 780 CMR or works in violation of a permit 'subject to penalties as prescribed by M.G.L. c. 143, s. 94(a),' and 115.3 applies the same penalties, with the per-day separate offense language, to continuing work after a stop work order.

Penalties, the as-built path, and what the statute actually says

What you can build without a permit in Massachusetts

0 of the 21 answered rules across Massachusetts need no permit at all and 8 turn on a size or scope condition the jurisdiction publishes, by project and jurisdiction, in each office's own words.

The exemptions and conditions, jurisdiction by jurisdiction

Building code in Massachusetts

Massachusetts State Building Code (780 CMR), Residential volume. Based on the International Residential Code (IRC), with Massachusetts amendments.

Administered by Massachusetts Board of Building Regulations and Standards (BBRS). Official source

Applies statewide and is enforced by local building departments.

Most local permit thresholds derive from this code. See our sources and standards.

What each Massachusetts jurisdiction publishes

One line per jurisdiction, written from its own rules rather than from a state summary. This is the section that used to be a list of links, and the states with the fewest jurisdictions to compare are the ones it says the most about.

Boston 13 rules
8 of 12 projects always need a permit and 4 turn on the size or scope of the work. The ones that depend on the project are bathroom remodel, deck, fence and shed. Published thresholds include deck at 200 sq ft and fence at 6 feet. 1 question is unresolved because the jurisdiction publishes no answer.
Worcester 10 rules
5 of 9 projects always need a permit and 4 turn on the size or scope of the work. The ones that depend on the project are deck, fence, pool and shed. Published thresholds include fence at 7 feet and shed at 200 sq ft. 1 question is unresolved because the jurisdiction publishes no answer.