Building permits in Cumberland County, Maine
Find the right authority before you build. Cumberland County permitting follows Maine law — here is exactly who issues the permit and where to start.
Cities issue permits
City of Portland — Permitting & Inspections
Maine is a town-based state: building permits are issued by the individual municipality (city/town Code Enforcement), not by the county. In Cumberland County the City of Portland Permitting & Inspections Department issues permits for Portland; other towns (e.g., Scarborough, South Portland, Cumberland) run their own code-enforcement offices.
Open the official permit portal →
Maine enforces the Maine Uniform Building & Energy Code (MUBEC) at the municipal level. Confirm permit requirements, trade permits, and inspections with the specific town where the property is located.
Permit cheat-sheet (Maine rules)
| Project | Permit? | Authority | Typical fee | Timeline | Go / No-Go | Key notes |
|---|---|---|---|---|---|---|
| 🏠 Accessory Dwelling Unit (ADU) | Permit required | city | Valuation-based; set by the issuing municipality (no statewide flat fee). | Plan review typically 2–4 weeks in staffed cities; over-the-counter where pre-approved. | Generally allowed | Maine has no statewide ADU law. ADUs are allowed only where the local ordinance permits them (e.g., Portland). Verify with your Code Enforcement Officer — many small towns have no ADU provision at all. Exempt: No statewide ADU mandate; size limits set by local ordinance. |
| 🪵 Deck / Porch | Conditional | city | Valuation-based; set by the issuing municipality (no statewide flat fee). | 1–4 weeks for plan review; simple exempt work is over-the-counter. | Generally allowed | Maine uses a 200 sq ft deck exemption (higher than the base IRC 120 sq ft). Footings must reach the local frost depth (commonly 48–60 in). Attached decks need a permit even if small — confirm with the Code Enforcement Officer. Exempt: Freestanding decks ≤200 sq ft and ≤30 in above grade are exempt. |
| 🧱 Fence / Wall | Conditional | city | Usually no building-permit fee for fences; zoning review may apply. | Often over-the-counter or no permit where exempt; verify locally. | Generally allowed | Maine has no uniform fence-permit rule — it is set locally. Check your town’s land-use/zoning ordinance. Pool barriers must meet the statewide barrier law (Title 22, Ch. 266, §1632). Exempt: Many towns exempt fences ≤6 ft; some require a permit for any fence. |
| 🛖 Shed / Outbuilding | Conditional | city | Valuation-based; set by the issuing municipality (no statewide flat fee). | Small exempt sheds over-the-counter or no permit; larger need plan review (1–4 weeks). | Generally allowed | Maine raises the IRC shed exemption from 120 to 200 sq ft. A land-use/zoning permit and shoreland-zoning review can still apply at any size. Towns under 4,000 population may not enforce MUBEC — but zoning still applies. Exempt: One-story detached sheds <200 sq ft are exempt from a building permit. |
| 🪜 Basement Finish | Permit required | city | Valuation-based; includes trade permits (electrical, plumbing, mechanical). | Plan review typically 2–4 weeks. | Generally allowed | Finished basements are uncommon in much of Maine but follow standard permit logic when finished. Verify egress and energy-code items with the Code Enforcement Officer. Exempt: Cosmetic finishing (paint, flooring) is exempt. |
| 🚗 Garage / Carport | Permit required | city | Valuation-based; includes trade permits. | New-structure plan review; varies by municipality (typically 2–4 weeks). | Generally allowed | Attached and detached garages require a full building permit and plan review. Footings must reach local frost depth (48–60 in). Exempt: Detached accessory structures over 200 sq ft require a permit (under 200 sq ft may be exempt). |
| ☀️ Rooftop Solar PV | Permit required | city | Building + electrical permits; fee set by the municipality. Electrical permit is issued through the State of Maine. | Often expedited; 1–2 weeks typical. | Generally allowed | Maine requires a licensed electrician for all electrical work, including solar. Provide racking/structural design for snow-load compliance. Exempt: No size exemption; all rooftop PV requires permits. |
| 🌡️ HVAC Replacement | Conditional | city | Mechanical permit; fee set by the municipality. | Trade permits often issued same-day/over-the-counter. | Generally allowed | Maine requires licensed contractors for HVAC. Equipment must meet current energy-efficiency rules. Exempt: In-kind replacement in the same location may be exempt. |
| 🍳 Kitchen Remodel | Conditional | city | Valuation-based when structural/plumbing/electrical work is included. | Standard review for permitted scopes (1–4 weeks). | Generally allowed | Maine’s energy code (stricter insulation/air-sealing) is triggered on substantial renovations. Verify with the Code Enforcement Officer. Exempt: Cabinet/countertop swap in the same layout is exempt. |
| 🛁 Bathroom Remodel | Conditional | city | Valuation-based when plumbing is relocated. | Standard review for permitted scopes. | Generally allowed | Ventilation to the exterior is required. Licensed plumber needed for plumbing permits in Maine. Exempt: Fixture-for-fixture swap in place is often exempt. |
| 🏗️ Room Addition | Permit required | city | Valuation-based; includes trade permits. | Plan review typically 3–4 weeks; multiple inspections. | Generally allowed | Lot-coverage, energy-code, and shoreland-zone compliance are reviewed. Footings to local frost depth. Exempt: No exemption — any new conditioned footprint requires a permit. |
| 🪟 Window / Door Replacement | Conditional | city | Usually no fee for in-kind swap; permit needed if opening is enlarged or energy code triggered. | In-kind swaps typically need no review. | Generally allowed | Replacement products should meet energy-code U-factor when the code is triggered. Verify with the Code Enforcement Officer. Exempt: Same-size, in-kind replacement is generally exempt. |
| 🏘️ Roof Replacement | Conditional | city | Often over-the-counter or exempt for same-footprint re-roof. | Re-roof often same-day/next-business-day if structural members unchanged. | Generally allowed | Ice-barrier/underlayment and snow-load requirements apply in Maine’s cold climate. Exempt: Same-material, same-slope re-roof is generally exempt. |
| 🅿️ Driveway / Parking Pad | Conditional | city | Building permit often not required; curb-cut/right-of-way work is separate. | Right-of-way permits reviewed by the town/road commissioner. | Generally allowed | A separate right-of-way/curb-cut permit is usually needed to connect to the street. Verify with the municipality. Exempt: Replacing a driveway in the same footprint (no new curb cut) is generally exempt. |
| 🏊 Swimming Pool / Spa | Permit required | city | Valuation-based; includes barrier/fencing and electrical bonding review. | Plan review 4–6 weeks; barrier inspection required before filling. | Generally allowed | Maine’s statewide pool-barrier law (Title 22, Ch. 266, §1632) requires a fence around every pool except above-ground pools with sidewalls ≥24 in. Electrical bonding/grounding is inspected by the State of Maine. Exempt: Prefabricated pools <24 in deep are often exempt; permanent pools always permitted. |
| 🧱 Retaining Wall | Conditional | city | Valuation-based when over the height threshold. | Over-threshold walls need plan review (1–4 weeks). | Generally allowed | Walls in shoreland zones or supporting a driveway/structure usually need a permit regardless of height. Verify with the Code Enforcement Officer. Exempt: Walls ≤4 ft measured from bottom of footing to top are exempt (unless supporting a surcharge). |
| 💥 Demolition / Teardown | Permit required | city | Demolition permit fee set by the municipality (valuation- or flat-based); verify with the Code Enforcement Officer. | Varies by municipality — typically 1–3 weeks for review and utility-disconnect coordination. | Generally allowed | Full or structural demolition of a building requires a permit from the local Code Enforcement Officer. A pre-demolition asbestos and lead-paint survey is generally required, and all utilities (electric, water, gas, sewer) must be disconnected by the serving utility before work begins. Interior non-structural demolition (e.g., removing non-load-bearing walls inside) may be exempt where it does not affect structure, egress, or MUBEC compliance — verify with the CEO. |
| 🚰 Septic System | Permit required | state | Subsurface wastewater permit fee set by the Maine CDC Subsurface Wastewater Unit / Local Plumbing Inspector; verify locally. | Site evaluation and plan review typically several weeks; a soil evaluation is required. | Generally allowed | Septic (onsite wastewater) systems in Maine are regulated under the Maine Subsurface Wastewater Rules by the Maine CDC Subsurface Wastewater Unit; permits are issued by the Local Plumbing Inspector (LPI) in many towns or by the state where no LPI serves. A new or replacement system requires a permit and a site/soil evaluation. This is NOT a building-department permit — contact your local plumbing inspector or the Maine CDC. |
| 🔌 EV Charger | Permit required | city | Electrical permit fee set by the municipality; verify with the Code Enforcement Officer / electrical inspector. | Electrical permits often issued same-day to 1–2 weeks. | Generally allowed | Installing an EV charging circuit (NEC Art. 625) requires an electrical permit; a dedicated branch circuit and often a new receptacle/panel is needed. Maine requires licensed electricians for all electrical work. Where adopted, the 2021 IRC Appendix T and 2023 IECC require EV-ready circuitry in new dwelling garages — verify local adoption with the CEO. |
| ⚡ Standby Generator | Permit required | city | Electrical (and gas, if fuel-fired) permit fee set by the municipality. | Electrical/mechanical permits often issued same-day to 2 weeks. | Generally allowed | A standby generator requires an electrical permit; fuel-fired units also need a gas/mechanical permit and combustion/venting review. Maine requires licensed electricians and plumbers. Review NEC Art. 445 (Generators) and Art. 702 (Legally Required Standby Systems); verify placement, load calc, and transfer-switch wiring with the local inspector. |
Frequently asked questions
Who issues building permits in Cumberland County, Maine?
City of Portland — Permitting & Inspections is the permitting authority for Cumberland County. Permits are issued by the incorporated cities; the county handles only unincorporated areas. Start at the official portal linked above.
Do I go to the county or my city for a building permit in Cumberland County?
Permits are issued by the incorporated cities; the county handles only unincorporated areas.
What home projects need a permit in Cumberland County?
The same project types shown in the cheat-sheet above (ADU, deck, fence, shed, solar, and more) — rules follow Maine state law. Whether the county or your city issues it depends on your property's incorporation status.
How do I apply for a permit in Cumberland County?
Use the official permit portal linked above. Most offices accept online submissions; have your plans, site information, and contractor details ready before applying.