9 county-level rules, plus city-specific rules for 1 city in Cumberland County, Maine.
Verified from official government sources
Cumberland County does not adopt zoning or ADU ordinances. Maine state law (30-A MRS § 4364-B, enacted by LD 2003) requires every Cumberland County municipality to allow at least one accessory dwelling unit on any lot where a single-family dwelling is the principal structure.
Cumberland County does not issue building or zoning permits. ADU permits are obtained from the code enforcement officer (CEO) of the municipality where the lot is located. State law caps the timeline: under 30-A MRS § 4364-B, towns must process ADU applications under the same standards as a single-family dwelling.
Cumberland County imposes no impact fees of any kind — it does not zone, build infrastructure for municipalities, or issue building permits. Municipal impact fees on ADUs are permitted under 30-A MRS § 4354, but the fee must be tied to a documented capital improvement plan and cannot be used to deter ADU construction.
Cumberland County does not regulate ADUs and could not impose an owner-occupancy requirement if it tried. Under 30-A MRS § 4364-B (LD 2003), no Maine municipality may require the property owner to live on a lot in order to build or rent an ADU.
Cumberland County does not regulate ADU rentals. State law (30-A MRS § 4364-B) protects long-term ADU rental as a use-by-right, but does not bar municipalities from regulating short-term rentals (STRs) under home-rule authority. Many Cumberland County towns (Portland, Scarborough, Bar Mills, etc.) have separate STR ordinances that govern ADUs used as Airbnb/Vrbo.
Cumberland County itself adopts no shed ordinance. The Maine Uniform Building and Energy Code (MUBEC) under 25 MRS §2451 governs structural standards, and each of the county's 28 municipalities sets size, setback, and permit thresholds.
Cumberland County does not regulate garage conversions. Under 30-A MRS §4364-A (LD 2003, 2022), every Cumberland County municipality must allow at least one accessory dwelling unit in any zone permitting single-family homes — which expressly authorizes converting an attached or detached garage into an ADU.
Cumberland County has no carport ordinance. Carports are accessory structures regulated by each municipality's zoning code, subject to MUBEC (25 MRS §2451) and, where applicable, the Shoreland Zoning Act 75-foot setback (38 MRS §435).
Cumberland County has no tiny-home ordinance. State law treats site-built tiny homes under MUBEC Appendix Q (IRC), manufactured tiny homes under 30-A MRS §4358 manufactured-housing parity, and tiny homes used as ADUs under the LD 2003 mandate at 30-A MRS §4364-A. Tiny homes on wheels (THOWs) are RVs under Maine law and cannot be permanent dwellings.
1 cities in Cumberland County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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