Building permits, zoning and septic rules in Kennebec County, Maine

Kennebec County does not issue one countywide residential building permit; the municipality shown on the parcel record handles building permits, while the Maine Land Use Planning Commission handles land-use permitting in Unity Township^1,2. Maine's building and energy code applies statewide, and municipalities with 4,000 or more residents must enforce it¹⁰. A municipality with up to 4,000 residents may elect not to enforce MUBEC, but the owner remains responsible for compliance⁴. Public buildings require a state construction permit before construction, alteration or a change of use regardless of project cost¹¹. A building in a municipality with more than 2,000 inhabitants may not be occupied until the building official issues a certificate of occupancy⁶. An owner who will occupy a new single-family home may do its electrical installation with the required certificate and inspections⁵. A separate home-construction-contract exemption changes contract requirements only; it does not waive building permits, inspections or a certificate of occupancy¹².

Start with the code-enforcement or building office for the municipality shown on the parcel record; that office decides the local building-permit and zoning-approval path, while Kennebec County does not operate one permit desk for every property^1,2. For Unity Township, start with the Maine Land Use Planning Commission because it administers land-use rules there². Ask the municipal office whether a building permit is required, which inspections apply and which zoning approval must be completed before work starts^1,2. Septic approval does not move to a county building department: each municipality's Local Plumbing Inspector issues the septic permit under the statewide program^3,13. The Maine CDC Subsurface Wastewater Program provides the statewide septic rules, forms and technical help³.

Kennebec County does not administer one zoning ordinance for all parcels: zoning approval, districts and dimensional rules vary by municipality, while the Maine Land Use Planning Commission administers zoning in Unity Township². We could not confirm one countywide minimum lot size, setback, lot-coverage limit or building-height schedule; ask the municipality governing the parcel, or the commission for Unity Township. Qualifying manufactured housing must be allowed on individual house lots where single-family homes are allowed, generally under the same requirements, though statutory design and safety criteria may apply¹⁴. At least one accessory dwelling unit must be allowed on a qualifying residential lot, including a nonconforming lot when the unit does not increase the nonconformity; the unit generally must be at least 190 square feet, and occupancy approval requires verification of adequate water and wastewater service¹⁵. A Maine-defined tiny home must be allowed where single-family homes are allowed or as an accessory structure, subject to the same applicable land-use requirements⁷.

Septic permits in Kennebec County go through each municipality's Local Plumbing Inspector under Maine's statewide subsurface-wastewater rules^3,13. Before installing, expanding or replacing a system or component, obtain the septic permit and a site evaluation prepared by a licensed site evaluator or professional engineer; normal maintenance and repair are excepted³. The state schedule lists $250 for a complete non-engineered system, $200 for a complete engineered system, $100 for a primitive or limited system, and a $40 minimum internal-plumbing fee; local requirements may also apply³. The system must pass site-preparation and pre-backfill inspections, and work must commence within 24 months after permit issuance³. Only 4.3% of Kennebec County soils are free of severe limitations for a conventional drain field, so arrange the evaluation before fixing the house site⁹. A sanitary district may require sewer connection within 200 feet, subject to the rule's conditions and an exception for a compliant private system¹⁶.

We could not confirm a countywide rule allowing long-term RV occupancy on private land in Kennebec County; ask the municipality's code office about zoning approval, occupancy and septic service before relying on an RV as housing². Maine's rule limiting stays at certain public campsites to 14 days in a 30-day period does not answer whether an owner may live in an RV on private land¹⁷. Unity Township follows the state land-use commission's rules, under which a private residential campsite is limited to transient occupancy of no more than 150 days in a calendar year^2,18. Tiny homes have a clearer municipal path: Maine municipalities must allow a Maine-defined tiny home where single-family homes are allowed or as an accessory structure, subject to applicable land-use requirements⁷. Qualifying manufactured homes likewise must be allowed on individual lots where single-family homes are allowed, subject to statutory and municipal requirements¹⁴.

1. Identify the municipality governing the parcel; for Unity Township, begin with the Maine Land Use Planning Commission².
2. Ask the municipal code office which building permit, zoning approval and inspection path applies, then confirm MUBEC compliance before finalizing plans^1,4.
3. Order a septic site evaluation early because only 4.3% of Kennebec County soils are free of severe limitations for a conventional drain field⁹.
4. Apply for the septic permit through the Local Plumbing Inspector and schedule the site-preparation and pre-backfill inspections³.
5. Apply for a MaineDOT driveway permit if a new or altered entrance connects to a state or state-aid highway, unless local rules govern in an Urban Compact Area¹⁹.
6. Obtain the building permit and zoning approval, then secure a certificate of occupancy before moving in where the municipality has more than 2,000 inhabitants⁶.
7. If dividing the tract, ask the municipal reviewing authority whether subdivision approval is required⁸.

Ask the governing municipality about the building permit, zoning approval, minimum lot size and setbacks before making an offer; for Unity Township, ask the Maine Land Use Planning Commission². Check soils before assuming a conventional septic field will work: only 4.3% of county soils are free of severe limitations for that use⁹. Kennebec County is 76.6% wooded, while 93.1% of its land has a slope of 15% or less, so a gently sloped parcel may still carry meaningful clearing costs⁹. In Augusta, a subdivision touching a flood-prone area must identify the mapped flood elevation and place principal structures at least 1 foot above it²⁰. Elsewhere, mapped flood-prone development may require a local Flood Hazard Development Permit²¹. State approval applies to new public water sources and associated wells, including site approval before drilling; that rule does not establish a universal permit for an ordinary private residential well²². The county's effective property-tax rate is about 1.1%, and its median annual property-tax bill is about $2,510⁹.