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Wellesley, Massachusetts: what can you build or do?

Plain-English answers to common homeowner questions, taken from Wellesley's published bylaws, with every rule linked to the section it comes from.

Last reviewed 2026-10-05

• Accessory Dwelling Units (ADUs)
  Yes. Wellesley's Zoning Bylaw allows one accessory dwelling unit (attached or detached) with any single-family home in a Single Residence District, with a building permit and Planning Department compliance certification. The ADU must be 250 to 900 sq ft and no more than half the main home's floor area, and it can't be rented for less than 30 days.Allowed with a permit
• Backyard Chickens
  Yes, but only with a Board of Health permit, granted after a public hearing that you must notify abutters about by certified mail. Birds must be kept at least 100 ft from a neighbor's house and 50 ft from any street, and roosters need an annual hearing.Allowed with a permit
• Short-Term Rentals (Airbnb / VRBO)
  Wellesley's bylaws we reviewed have no short-term rental license, registration or rules for renting out a whole house on Airbnb or VRBO. The one direct rule: an accessory dwelling unit (ADU) can't be rented for less than 30 days or leased more than once in any 30-day period.Not specifically regulated
• Fences
  Wellesley's bylaws we reviewed set no general fence height limit or property-line setback for homes; this verdict rests on that silence, so confirm with the Building Department before building. The one townwide rule: at street corners, nothing that blocks sightlines may stand in a triangle measured 20 ft back from the intersection. Fences in a Historic District, the Flood Plain District or a Neighborhood Conservation District need extra approval.Allowed
• Sheds & Accessory Buildings
  Yes. A detached shed of 100 sq ft or less doesn't have to meet Wellesley's side and rear yard setbacks, but a larger one must: typically 20 ft from side lines and 10 to 40 ft from the rear line, depending on your district and when the lot was created. Under the state building code, sheds over 200 sq ft also need a building permit.Allowed
• Burn Permits & Backyard Fires
  Backyard fire pits, chimineas and outdoor fireplaces at one- and two-family homes need a $35 permit from the Wellesley Fire Department, and the fire must be at least 20 ft from buildings, property lines and trees. The town sources we reviewed don't set local brush-burning rules; seasonal brush burning follows state rules and needs a Fire Department permit.Allowed with a permit
• Home-Based Businesses
  Yes. In Single Residence Districts, a quiet home occupation is allowed by right once you notify the Inspector of Buildings, as long as there are no non-resident employees, no sign, no extra parking and no change to the home's appearance. A bigger home business, with up to the equivalent of two full-time non-resident employees, needs a special permit from the Zoning Board of Appeals.Allowed with a permit
• Swimming Pools
  Yes, with a building permit. Wellesley's Zoning Bylaw requires a pool to be at least 30 ft from any street line and at least 10 ft (up to 30 ft, depending on how far the pool sits above grade) from other property lines, and it must be enclosed by a fence at least 6 ft high with self-latching gates.Allowed with a permit
• Building Near the Water (Wetlands Rules)
  Building, filling or altering land within 100 ft of a wetland, pond or stream, or within 200 ft of a perennial river or stream, needs a permit from Wellesley's Wetlands Protection Committee. Its regulations bar almost all work within 25 ft of a water body, bank or vegetated wetland (the 25-foot No Disturbance Zone) unless you get a waiver.Allowed with board review
• Docks, Piers & Floats
  Wellesley has no dock or harbor bylaw, but a dock, pier or float on a pond or stream is regulated under the town's Wetlands Protection Bylaw: its regulations list docks, pilings and floats as obstructions in water, so you need a permit from the Wetlands Protection Committee before installing one. No local size limits were found; state Chapter 91 licensing may also apply on great ponds such as Lake Waban.Allowed with board review