Building permits, zoning and land rules in Washington County, Maine

In Washington County's LUPC service area, a new house, camp or expansion of an existing residential structure generally requires an LUPC building permit¹. A qualifying accessory structure may avoid a permit, but the owner must notify LUPC and verify that the project meets its standards⁹. Construction cannot begin until LUPC issues the permit¹. Incorporated municipalities handle their own permit administration, so ask the town code office what application and inspections apply². MUBEC applies statewide; larger municipalities must enforce it, while smaller municipalities may choose whether to enforce it locally³. In municipalities above 2,000 inhabitants, a building subject to required inspections may not be occupied until the building official issues a certificate of occupancy¹⁰.

For building permits and zoning approval on land in the unorganized or deorganized territory, contact the Maine Land Use Planning Commission's Augusta office at (207) 287-2631¹¹. The required LUPC form depends on the development, and floodplain work needs the floodplain supplement with the underlying permit application¹². For building permits and zoning approval in an incorporated municipality, start with that town or city's code office because local administration varies². Septic permits stay separate: they are issued by a Local Plumbing Inspector, appointed by the town in organized municipalities and assigned for the unorganized territories, whichever side of the line the parcel is on^4,13. The Washington County Commissioners' / County Manager's Office handles general county administration at 207-255-3127, but it is not a substitute for LUPC or a municipal code office¹⁴. The Registry of Deeds holds land records at 85 Court Street in Machias and can be reached at 207-255-6512¹⁵. The Office of Washington County Unorganized Territories handles local roads and other municipal-style services at (207) 255-8919¹⁶.

Washington County does not have one zoning answer for every parcel. LUPC is the planning and zoning authority for the unorganized and deorganized territory, including 34 townships and 3 plantations covering approximately half the county². LUPC zoning subdistricts and the current land-use guidance map control there; confirm the official map with LUPC because published tabloid and digital maps are not definitive¹⁷. Organized municipalities administer their own land-use ordinances, and their zoning status varies². In LUPC territory, a typical residential minimum lot is 40,000 square feet with on-site wastewater or 20,000 square feet with off-site common or community sewer, subject to the parcel's subdistrict and exceptions¹⁸. Municipal ADUs generally must be allowed where residential uses are permitted and must be at least 190 square feet, but those standards do not extend to LUPC territory¹⁹.

A new, expanded or replacement septic system anywhere in Washington County, including LUPC territory and organized towns, requires a septic permit from the Local Plumbing Inspector before work begins, except for normal maintenance and repair⁴. The application generally requires a licensed site evaluator, or a professional engineer or licensed site evaluator for an engineered system, and work must start within 24 months after permit issuance⁴. Installation requires a site-preparation inspection before work and another inspection before final backfilling; give the inspector at least 24 hours' notice when the system is ready⁵. Off-grid does not mean permit-free: permanent alternative toilets require permits, and primitive or limited graywater systems remain subject to system and setback rules²⁰. Only about 1% of Washington County soils are free of severe limits for a conventional drain field, so obtain the site evaluation before committing to a building location²¹.

In incorporated municipalities, a tiny home must be permitted on an individual house lot where single-family homes are allowed, subject to the applicable rules for a single-family home or accessory structure⁷. We could not confirm a distinct tiny-home occupancy rule for LUPC territory, so ask LUPC about the parcel's subdistrict and permit path. For a personal-use campsite in LUPC territory, tents, trailers and RVs may be present for no more than 120 days per calendar year; the stated limit in a P-FP flood area is 90 consecutive days⁶. Separate LUPC flood-prone-area standards allow an RV for no more than 150 consecutive days if it remains licensed and highway-ready, unless it meets the applicable manufactured-home elevation and anchoring route¹⁸. Those provisions do not establish a general right to live full-time in an RV. Manufactured homes in LUPC flood-prone areas face elevation, permanent-foundation and anchoring requirements¹⁸.

1. Confirm whether the parcel is in an organized municipality or LUPC territory because zoning and permit administration differ².
2. Check the deed and parcel history with the Washington County Registry of Deeds¹⁵.
3. In LUPC territory, confirm the official zoning subdistrict and choose the application matching the project^12,17.
4. Obtain any required state-highway or local-road driveway permit and include it with the LUPC application²².
5. Do not begin regulated residential construction until LUPC issues the permit¹.
6. In an organized municipality, ask the code office which permits and inspections it administers; MUBEC compliance remains mandatory³.
7. Arrange the septic evaluation, permit and installation inspections through the Local Plumbing Inspector^4,5.
8. Complete LUPC self-certification; if the permit requires a Certificate of Compliance, obtain it before occupancy^23,24.

Soils: only 1% of Washington County soils are free of severe limits for a conventional septic drain field, so obtain a site evaluation before fixing the home site²¹. Jurisdiction: verify whether the parcel is in an organized municipality or LUPC territory before assuming any permit or zoning rule². Dimensions: in LUPC territory, the applicable subdistrict can change lot size, coverage, height and allowed uses; the baseline building coverage is 30%, but exceptions apply²⁵. Access: a driveway onto a state or state-aid highway may need MaineDOT approval, while a local-road permit may come from the county, town or plantation²². Flood: mapped flood-hazard work uses the LUPC floodplain supplement with the underlying application¹². Taxes: the effective property tax rate is about 1.1%, with a median annual bill around $1,654²¹.