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Plymouth, Massachusetts: what can you build or do?

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

Last reviewed 2026-10-15

• Accessory Dwelling Units (ADUs)
  Yes. Plymouth's zoning bylaw (October 2025 version) allows one accessory dwelling unit, attached or detached, per lot by right in all Residential and Mixed Use districts, up to 900 sq ft, with a zoning permit and then a building permit from Inspectional Services. The ADU can't be a short-term rental. The bylaw's definition still says the main house must be owner-occupied, but state law since Feb. 2, 2025 bars owner-occupancy requirements for one ADU per lot.Allowed with a permit
• Backyard Chickens
  Yes. Plymouth's Board of Health poultry rules allow backyard hens with no permit or flock-size limit, but roosters are banned. Coops must be at least 10 feet from your property lines and from any road, and manure must be kept at least 20 feet from property lines.Allowed
• Short-Term Rentals (Airbnb / VRBO)
  Yes, with a Board of Health permit. Since January 1, 2024, anyone renting a home or rooms in Plymouth for stays under 31 days (more than 14 days a year) must register and get a short-term rental permit from the Department of Public Health, with a $50 annual fee. Homes with failed or nonconforming septic systems get only a provisional permit, subsidized/affordable homes are ineligible, and ADUs can't be short-term rentals.Allowed with a permit
• Fences
  In Plymouth, a fence or wall in the required front yard can be up to 6 feet high and can't materially block drivers' view from the road; the zoning bylaw sets no side or rear height limit and lets fences stand within setbacks, up to the lot line. The bylaw counts anything 3 feet or taller as a structure (it calls a fence a "customary minor Structure") and requires a zoning permit for any new structure, so plan on a zoning permit for a fence 3 feet or taller and confirm with Inspectional Services.Allowed with a permit
• Sheds & Accessory Buildings
  Yes, but every shed needs town sign-off. In Plymouth a shed under 12 feet tall and under 300 sq ft is allowed by right if it sits at least 20 feet from the front lot line, 10 feet from side and rear lines and 10 feet from the house. Sheds up to 200 sq ft need a zoning application with a site plan; sheds 201 sq ft and up also need a building permit.Allowed with a permit
• Home-Based Businesses
  Yes, if it fits Plymouth's home occupation rules: the business can use no more than 25% of the home's floor area, have at most one non-resident employee on site, one small flat-mounted unlit sign (1 sq ft max), no outside storage and no more traffic than a normal home. Inspectional Services has you sign a home occupation form agreeing to these rules.Allowed with a permit
• Swimming Pools
  Plymouth has no pool-specific bylaw. The zoning bylaw requires a zoning permit before any structure is built, an above-ground pool 3 feet or taller must stay out of required yards, and on a septic lot an in-ground pool must be at least 10 feet from both the septic tank and the leach field. Pool fencing and barrier rules come from the state building code, not a local bylaw.Allowed with a permit
• Building Near the Water (Wetlands Rules)
  Work within 100 feet of a wetland, pond, stream, coastal bank, beach, dune or flood zone (200 feet of a vernal pool) needs a permit from the Plymouth Conservation Commission. The first 35 feet from the resource area is a no-touch zone, 35 to 50 feet is a no-build zone, and work from 50 to 100 feet is allowed only if there's no practical alternative.Allowed with board review
• Docks, Piers & Floats
  A private pier, dock or float in Plymouth needs a permit from the Conservation Commission, because driving piles or placing docks and floats in water counts as altering a protected resource area. On great ponds, a swim raft or moored float needs a Harbormaster mooring permit, can be no larger than 100 sq ft, must stay within 100 feet of shore, and must be out of the water from December 1 to May 1.Allowed with board review

We couldn't download Plymouth's bylaw text for the other 1 topics yet, so we don't cover them rather than guess.