ADU Town Rules & Regulations
Kennebunkport, ME
Feb 3, 2026
Last Updated
About
Kennebunkport, Maine, is a picturesque coastal town in York County with a year-round population of approximately 3,700 residents. Historically a shipbuilding and fishing village, it has evolved into one of New England’s most beloved summer colonies and tourist destinations. The town’s Dock Square is a lively hub filled with souvenir shops, art galleries, schooner attractions, seafood restaurants, and bed and breakfasts, offering visitors a quintessential seaside experience. Just a few miles away, Cape Porpoise maintains its charm as a working fishing harbor, featuring a small village center with local eateries, a church, grocery store, coffee shop, library, and gallery. Outdoor enthusiasts can enjoy Goose Rocks Beach, sailing tours, and whale-watching excursions, while those drawn to arts and culture will appreciate the town’s museums and seasonal celebrations like the Kennebunkport Christmas Prelude. With its rich maritime heritage and scenic coastal setting, Kennebunkport offers a unique blend of historic charm and relaxed coastal living.
ADU Rules
Only one ADU is permitted per single family dwelling.
Both the primary and the accessory dwelling unit shall be occupied as primary residences (primary residence shall be defined as occupying the property for more than 6 months per year).
The area of an accessory dwelling unit shall be a minimum of one hundred and ninety (190) square feet, and a maximum of eight hundred (800) square feet.
ADUs may be located within a dwelling, attached to an existing dwelling, or detached.
Accessory dwelling units shall not be used as short term rentals (must be rented for a period of six months or greater.)
The primary dwelling may only have one front entrance; however, a foyer may be created that leads from the foyer to the two dwellings.
ADUs are not permitted in Shoreland zoning unless the lot is double the lot size for that zone, double the minimum lot size, and double the shore frontage.
Town sewer or septic systems must be evaluated to ensure capacity and proper condition.
Properties on private wells must have a water quality test done prior to receiving a certificate of occupancy.