Can I keep backyard chickens in Hamilton, Massachusetts?
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.
| Minimum lot size for a coop/barn | 80,000 sq ft [1] |
| Coop/barn setback | 50 feet from any lot line [1] |
| License | Poultry buildings must be licensed by the Board of Health [1] |
| Use | Occupants' own use only [1] |
| Poultry kept for others | ZBA special permit (R-1A, R-1B, RA); not allowed in Town Center [2] |
| Max number of hens / roosters | Not specified in the bylaws reviewed [1] |
Zoning rules for coops
In the R-1A, R-1B and RA districts and the Downtown Residential sub-district, the zoning bylaw generally allows agricultural activities as accessory uses [3]. Farm buildings such as barns and shelters, including buildings for keeping animals and poultry, are allowed as accessory structures on lots of at least 80,000 square feet. They must be licensed by the Board of Health, are for the occupants' use only, and can't be closer than 50 feet to any lot line [1]. The bylaw doesn't spell out whether a small coop on a smaller lot is allowed, so ask the Building Department before building one.
Selling eggs or keeping birds for others
The Table of Principal Uses lists "the raising or keeping of poultry, horses, or cows for other than the use of the occupants of the residence" as needing a Zoning Board of Appeals special permit in the residential districts. It is not allowed in the Town Center sub-districts [2].
Flock size and roosters
The bylaws we reviewed set no maximum number of hens and don't mention roosters. Those limits, if any, would come from the Board of Health license.
Right to Farm
Hamilton's Right to Farm bylaw counts the "keeping and raising of poultry" as farming [4], and recognizes the noise and odors of normal farm practices. It mainly protects farms, defined as land used primarily for commercial agriculture, rather than backyard flocks.
Board of Health
We could not find a posted Board of Health regulation on keeping animals or poultry. Since the zoning bylaw requires poultry buildings to be licensed by the Board of Health, contact the Health Department for current license terms, fees and any flock limits.
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Next steps
- Check your lot size and zoning district with the Building Department (978-626-5250); the zoning coop rules assume a lot of at least 80,000 sq ft.
- Contact the Hamilton Board of Health/Health Department to apply for the required license for a poultry building and ask about flock limits and roosters.
- Site the coop at least 50 feet from every property line and ask whether a building permit is needed for its size.
- If you plan to sell birds or keep them for others, apply to the Zoning Board of Appeals for a special permit.
Common questions
- Can I keep chickens in Hamilton, Massachusetts?
- Possibly, on larger lots. The zoning bylaw allows poultry buildings for the household's own use on residential lots of at least 80,000 square feet, licensed by the Board of Health.
- How far must a chicken coop be from the property line in Hamilton, Massachusetts?
- At least 50 feet from every lot line.
- Can I sell eggs or keep chickens for others in Hamilton, Massachusetts?
- Keeping poultry for anyone other than the household needs a special permit from the Zoning Board of Appeals.
- How many hens can I have in Hamilton, Massachusetts?
- The bylaws reviewed don't specify a maximum number of hens or roosters. Ask the Board of Health about flock limits and roosters.
Massachusetts state rules on backyard poultry
Massachusetts has no statewide right to keep backyard hens. Whether you can keep chickens, how many, and where the coop goes are set locally, through your town's zoning bylaw and Board of Health regulations.
- Board of Health power: under M.G.L. c. 111, §31, local boards of health may adopt "reasonable health regulations", and many use this power to require a permit to keep poultry. Violations can bring fines of up to $1,000. In towns with an agricultural commission, the board must send that commission any proposed rule affecting the non-commercial keeping of poultry, livestock or bees for a 45-day review.
- Agricultural zoning protection is for farms, not most backyards: c. 40A, §3 stops zoning from banning or requiring a special permit for commercial agriculture. Towns may limit that protection to parcels of 5 acres or more, or 2 acres or more if the land produces at least $1,000 per acre a year in sales. A typical backyard flock doesn't qualify.
- Annual barn inspections: your town's animal inspector, working under the state Department of Agricultural Resources (MDAR), does annual barn inspections and a census of livestock and poultry. Backyard flock owners may be contacted.
- Nuisance rules still apply: a board of health may also regulate or prohibit an activity that causes a nuisance or offensive odors (c. 111, §143).
What the bylaw says
- Sec. 3.2.2(2), Zoning By-Law (first adopted 1954, including amendments up to December 9, 2025 STM), p. 25
Activities associated with agriculture, horticulture and floriculture, such as barns, private stables, and shelters, and other farm buildings are allowed as Accessory Uses and/or Structures on Lots not less than eighty thousand (80,000) square feet in area, and including Buildings for keeping animals and poultry, duly licensed by the Board of Health, for occupant’s use only, provided that no such barns, private stables, and shelters, and other farm buildings shall be nearer than fifty (50) feet to any Lot line.
- Sec. 3.1, Table of Principal Uses, C.3, Zoning By-Law (first adopted 1954, including amendments up to December 9, 2025 STM), p. 22
3. The raising or keeping of poultry, horses, ZBA ZBA ZBA N N N N N or cows for other than the use of the occupants of the residence
- Sec. 3.2.2(1), Zoning By-Law (first adopted 1954, including amendments up to December 9, 2025 STM), p. 25
Accessory Uses on the same Lot with and customarily incidental to a permitted main use on the same premises are allowed, including but not limited to: agricultural activities, private swimming pools, tennis courts, and Private Garages.
- Ch. XXVIII Right to Farm By-Law, Sec. 2, Town By-Laws (updated May 1, 2024; through STM Nov 6, 2023, AG approved Feb 5, 2024), p. 62
Keeping and raising of poultry, swine, cattle, ratites (such as emus, ostriches and rheas) and camelids (such as llamas and camels), and other domesticated animals for food and other agricultural purpose, including bees and fur-bearing animals.