Clinton, MA Accessory Structures: Carport Rules (2026)

Carports in Worcester County are regulated as accessory structures under 780 CMR (MA State Building Code) and local zoning adopted under MGL c. 40A. Any carport with a roof structure requires a building permit per 780 CMR 105, regardless of whether it has walls. Key design requirements: (1) Snow load — Worcester County ground snow loads (Pg) per ASCE 7 range 50-60 psf (higher in elevated areas like Princeton, Barre, Athol); roof snow load calculated per 780 CMR 1608. This effectively eliminates many low-cost pre-fabricated carports that don't meet MA loads. (2) Wind load — Worcester County is in Risk Category II, wind speed 110 mph per 780 CMR 1609 ASCE 7 maps, with exposure category set by site. (3) Foundation — footings typically required below frost line (48 inches minimum). (4) Setbacks — local zoning varies: Worcester Zoning Ordinance Article IV requires accessory structures be at least 5 ft from side/rear lot lines. Leominster and Fitchburg have similar 5-10 ft rear/side setbacks. Front yard placement usually prohibited. (5) Lot coverage — counts toward maximum impervious/structure coverage (commonly 25-40% max). Attached carports (sharing a wall with the dwelling) require additional 780 CMR 706 fire separation if under certain size. Electrical, if included (lighting), requires 527 CMR 12.00 permit. Historic district properties may require Historic District Commission approval under MGL c. 40C. HOAs may restrict or prohibit; CC&Rs enforceable.