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Hamilton, Massachusetts: what can you build or do?

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

Last reviewed 2026-10-05

• Accessory Dwelling Units (ADUs)
  Yes. Hamilton allows one attached or detached ADU by right in all single-family residential districts with a building permit from the Building Commissioner. It can be no larger than 50% of the main home's gross floor area or 900 square feet, whichever is smaller, needs one off-street parking space, and can't be used as a short-term rental.Allowed with a permit
• Backyard Chickens
  Possibly, on larger lots. Hamilton's zoning bylaw allows buildings for keeping poultry for the household's own use on residential lots of at least 80,000 square feet (about 1.8 acres), licensed by the Board of Health and set at least 50 feet from every lot line. Keeping poultry for anyone other than the household needs a special permit from the Zoning Board of Appeals.Restricted
• Short-Term Rentals (Airbnb / VRBO)
  Unclear for a main home, and not allowed in an ADU. Hamilton has no short-term rental registration or license in the bylaws we reviewed, and its zoning bylaw doesn't list short-term rentals as a use, though it treats any unlisted use as prohibited. The zoning bylaw expressly bans short-term rentals in accessory dwelling units, so confirm with the Building Commissioner before listing your home.Restricted
• Fences
  Hamilton's bylaws don't set a fence height limit or fence setback for homes, and the zoning bylaw's definition of a yard expressly allows fences in required yards, so this answer rests on that silence. The main rule is corner clearance: on a corner lot, nothing between 3.5 and 8 feet high may stand within the 15-foot triangle at the street intersection. Pool fences must be at least 4 feet high.Not specifically regulated
• Sheds & Accessory Buildings
  Yes. One small storage shed, no larger than 8 by 12 feet and no taller than 10 feet, can sit as close as 5 feet to the side and rear lot lines. Larger sheds and other accessory buildings must be at least 25 feet from the street line and at least 20 feet (or their height, if greater) from side and rear lot lines.Allowed
• Burn Permits & Backyard Fires
  Hamilton's bylaws we reviewed don't have their own open-burning or fire pit rules. Brush burning follows the state rules and needs a burn permit from the Hamilton Fire Department, which the town issues through its online burning permit site.Not specifically regulated
• Home-Based Businesses
  Yes. Hamilton allows a customary home occupation by right in its residential districts, run by someone who lives there, in the house or an accessory building. It must stay secondary to the home, with no more than 2 non-resident employees, no outdoor storage or display, no more than 2 commercial vehicles parked outside, and signs limited to 3 square feet.Allowed
• Swimming Pools
  Yes, with a building permit. Hamilton's bylaw requires any outdoor pool deeper than 18 inches to be enclosed by a fence or wall at least 4 feet high with a self-closing, self-latching gate. The Building Department's pool handout says the pool and any structural deck must be at least 20 feet from side and rear lot lines, 25 feet from the front lot line and 12 feet from the house.Allowed with a permit
• Building Near the Water (Wetlands Rules)
  Work near a wetland, pond, lake or stream in Hamilton needs a permit from the Conservation Commission. The town's wetlands bylaw sets a no-disturbance zone and a no-build zone next to wetlands: on residential lots that were occupied, or had a house building permit, by December 31, 2007, nothing may be disturbed within 25 feet and nothing built within 50 feet; on other lots those limits are 50 and 75 feet.Allowed with board review
• Docks, Piers & Floats
  Hamilton's bylaws we reviewed have no specific rules for private docks, piers or floats. Hamilton is an inland town, and any dock on a pond, lake or river would need a permit from the Conservation Commission under the town wetlands bylaw, and possibly state approvals.Not specifically regulated