Before You Build in Lowell, MA: Permit & Rule Checklist (2026)

All residential swimming pools in Lowell must be enclosed by a barrier at least 48 inches tall with self-closing, self-latching gates, per 780 CMR.

Fences over 6 feet in height require a building permit in Lowell; shorter residential fences generally do not, but historic district approval may be needed.

Retaining walls over 4 feet in height (measured from bottom of footing to top) require engineered plans and a building permit in Lowell.

Residential fences in Lowell are generally limited to 6 feet in side and rear yards and 4 feet in front yards, with taller fences requiring a special permit.

Massachusetts law (MGL c.49, the Fence Law) governs shared boundary fences; Lowell applies these rules along with zoning setbacks.

Lowell treats above-ground pools over 24 inches deep the same as in-ground pools for permitting, barrier, and electrical safety, with some allowances for pool-wall barrier compliance.

Lowell hot tubs and spas require building and electrical permits and must have a locking safety cover meeting ASTM F1346 or a code-compliant barrier.

Lowell requires a building permit for all permanent in-ground and above-ground pools over 24 inches deep, plus electrical and plumbing permits under the Massachusetts State Building Code.

Lowell pools must comply with the federal Virginia Graeme Baker Pool and Spa Safety Act anti-entrapment requirements plus Massachusetts supervision, signage, and equipment rules.

Lowell pool barriers must meet the International Swimming Pool and Spa Code adopted by Massachusetts with a 48-inch minimum height, self-closing self-latching gates, and compliant gap spacing.

Lowell requires a building permit from the Development Services Department for any detached garage. Detached garages must be one (1) story in maximum height, set back at least 5 feet from side and rear property lines, and at least 10 feet from the principal structure on the same lot, with the front-yard setback determined by the underlying Lowell Zoning Ordinance district.

Under the Massachusetts Affordable Homes Act of 2024 and MGL c.40A s.3A, ADUs up to 900 square feet are allowed by right on single-family lots in Lowell. The city updated its zoning to comply with the state ADU mandate effective February 2025.

Tiny homes on permanent foundations can qualify as ADUs in Lowell under the 2024 state ADU mandate up to 900 square feet. Tiny houses on wheels are generally not allowed as permanent dwellings because they are classified as RVs under state law.

Carports are treated as accessory structures in Lowell and require a building permit if they exceed 120 square feet or are attached to the house. They must meet zoning setbacks and may not be located in the front yard setback.

Sheds in Lowell generally require a building permit if over 120 square feet under the Massachusetts State Building Code. Smaller sheds are permit-exempt but must still meet zoning setbacks and may need historic review in designated districts.

Open burning of brush is prohibited in Lowell because the city is classified as a non-burn community under 310 CMR 7.07. Residents cannot burn yard waste, leaves, or brush at any time of year.

Lowell permits recreational fire pits on private residential property when fuel is clean seasoned wood and the fire is attended, but permits from the Lowell Fire Department are required for larger outdoor fires under Massachusetts fire code.

Lowell draws drinking water from the Merrimack River and generally has abundant supply, so routine outdoor watering restrictions are limited. Drought-stage restrictions on irrigation can be imposed by the state or city during Massachusetts Drought Management Plan declarations.

Private trees may generally be removed without a permit in Lowell, but any public shade tree requires Tree Warden approval and a posted hearing under MGL c.87. Trees in wetland buffers also need Conservation Commission review.

Trees on private property in Lowell may be trimmed by the owner, but public shade trees in the tree belt or right-of-way are protected under MGL c.87 and require a permit and hearing from the Tree Warden before any cutting.