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

At a glance

Building permit

Issued locally; municipal enforcement is mandatory above 4,000 residents and elective at or below that threshold¹⁴

Zoning

Municipal rules vary; the state land-use commission governs Unity Township²

Septic permits

Same statewide process everywhere: apply through your town's Local Plumbing Inspector (HHE-200 form)³

Owner-builder

A future occupant may wire a new single-family home with the required certificate and inspections; this does not waive building permits⁵

Certificate of occupancy

Required before occupancy in a municipality with more than 2,000 residents⁶

Tiny homes

Allowed up to 400 sq ft where single-family homes are allowed, subject to applicable land-use rules⁷

Subdivision

Dividing land into 3+ lots within 5 years is a regulated subdivision needing municipal review⁸

Septic soil difficulty

Only 4.3% of county soils are free of severe limits for a conventional drain field⁹

Who to call

Contact details are copied from each office’s official page and were checked against it on October 10, 2026.

Do you need a building permit 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 Township¹². 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.

Who handles building permits in Kennebec County, and how do you reach them?

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 property¹². 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 starts¹². Septic approval does not move to a county building department: each municipality's Local Plumbing Inspector issues the septic permit under the statewide program³¹³. The Maine CDC Subsurface Wastewater Program provides the statewide septic rules, forms and technical help¹⁴.

Does Kennebec County have zoning?

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 apply¹⁵. 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 service¹⁶. 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.

How do septic permits work in Kennebec County?

Septic permits in Kennebec County go through each municipality's Local Plumbing Inspector under Maine's statewide subsurface-wastewater rules³¹³. 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 excepted¹⁷. 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 apply¹⁸. The system must pass site-preparation and pre-backfill inspections, and work must commence within 24 months after permit issuance¹⁷. 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 system¹⁹.

Can you live in an RV or tiny home on your land in Kennebec County?

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 land²⁰. 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 year²¹². 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 requirements¹⁵.

Building a home in Kennebec County: the steps, in order

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 plans¹⁴.
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 inspections¹⁷.
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 Area²².
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.

What to check before you buy land in Kennebec County

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 costs²³²⁴. In Augusta, a subdivision touching a flood-prone area must identify the mapped flood elevation and place principal structures at least 1 foot above it²⁵. Elsewhere, mapped flood-prone development may require a local Flood Hazard Development Permit²⁶. 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 well²⁷. The county's effective property-tax rate is about 1.1%, and its median annual property-tax bill is about $2,510²⁸²⁹.

Watch-outs

• A small municipality may choose not to enforce MUBEC, but the building owner remains responsible for code compliance⁴.
• We could not confirm one countywide minimum lot size, setback, lot-coverage limit or building-height schedule; ask the municipality governing the parcel².
• We could not confirm a countywide right to live long-term in an RV on private land; Unity Township has a 150-day transient-occupancy limit for a residential campsite, while incorporated municipalities may set their own rules²¹².

Sources

1. City of Augusta Code Ch. 134 Building Construction (2026 county census)
2. Title 30-A, §4352: Zoning ordinances, quoted and re-checked
3. Maine CDC Subsurface Wastewater System Permitting (2026 county census)
4. Division of Building Codes and Standards, quoted and re-checked
5. Title 32, §1102-D: Single-family dwelling exception; certificate required, quoted and re-checked
6. Title 25, §2357-A: No occupancy without certificate; appeal, quoted and re-checked
7. Title 30-A, §4363: Regulation of tiny homes, quoted and re-checked
8. Title 30-A, §4401: Definitions, quoted and re-checked
9. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
10. Building & Energy Codes, quoted and re-checked
11. Construction — Permitting Guidance, quoted and re-checked
12. Title 10, §1489: Exemption, quoted and re-checked
13. Subsurface Wastewater Unit, quoted and re-checked
14. Maine CDC Subsurface Wastewater Program (maine.gov)
15. Title 30-A, §4358: Regulation of manufactured housing, quoted and re-checked
16. Title 30-A, §4364-B: Accessory dwelling units, quoted and re-checked
17. Subsurface Wastewater System Permitting, quoted and re-checked
18. Subsurface Wastewater System Permitting, quoted and re-checked
19. Title 38, §1160: Connection of private sewers (Maine statewide rule), quoted and re-checked
20. Title 12, §9342: Seasonal use only, quoted and re-checked
21. Maine Land Use Planning Commission Chapter 2, Definitions (Maine statewide rule), quoted and re-checked
22. Driveway and Entrance Permitting, quoted and re-checked
23. Wooded share of land: Bolthole Index county data
24. Share of land at 15% slope or less: Bolthole Index county data
25. Part 4: Subdivision and Site Plan Review - City of Augusta, ME, quoted and re-checked
26. Floodplain Ordinances & Permit Forms (Maine statewide rule), quoted and re-checked
27. New Well and New Source Approval, quoted and re-checked
28. Effective property tax rate: Bolthole Index county data
29. Median property tax bill: Bolthole Index county data

Written October 10, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.