Barndominium permitting is limited statewide; extra approvals or variances may be needed.
The Board of Building Regulations and Standards adopts the state building code. All municipalities must enforce it. Local amendments are not permitted beyond state code.
Primary Code
Massachusetts State Building Code (780 CMR)
Code Version
10th Edition based on 2021 IBC / 2021 IRC with MA amendments
Adoption Level
Statewide
Statewide Enforcement
Yes
All municipalities have building inspectors. Some communities have adopted the MA Stretch Energy Code, which is even more restrictive.
Residential
Required
Commercial
Required
Agricultural
Required
Limited agricultural exemptions. Farm buildings generally must meet building code requirements.
Very small structures may be exempt per state code provisions.
Cape Cod and the islands have hurricane wind loads. Heavy snow loads statewide, higher in western MA mountains.
Wind Load
110–145 mph
high zone
Snow Load
30–65 psf
Seismic
A–B
Category
Flood
FEMA Regulated
Energy Code
MA Energy Code / Stretch Code
Version
2021 IECC-based with MA amendments
Many municipalities have adopted the Stretch Energy Code, which exceeds the base state energy code.
License Type
Home Improvement Contractor (HIC) registration and Construction Supervisor license
Massachusetts requires Construction Supervisor licenses for structural work. Home improvement contractors must register with the state.
Front
25–40 ft
Side
10–20 ft
Rear
20–30 ft
Strict zoning in most communities. Variances difficult to obtain.
Frost depth 48 inches. Full basements are standard and expected in residential construction.
Full permits required. Zoning must allow accessory structures.
Limited agricultural exemptions. Most farm buildings require permits.
Very challenging. Strict zoning and aesthetic requirements in most towns. Western MA is most feasible.
Full permits required.
Full state building code compliance. Stretch Code may apply.
HOAs exist but zoning regulations are the primary restriction. Most towns have strict zoning that limits non-traditional construction.
Coastal flood zones along the entire coast. Riverine flooding inland.
Verify the information above directly from these official sources. Regulations change — always confirm with your local building department before starting construction.
Disclaimer: This guide is for informational purposes only and does not constitute legal or professional advice. Building codes, permit requirements, and zoning regulations change frequently. Always verify current requirements with your local building department, planning office, or a licensed professional before starting construction. Homestead Steel Structures & Design is not a legal authority on building codes or zoning regulations. Last updated February 2026.
