Rent Increase Rules in Portland, Maine
This page combines the verified Maine baseline with a separately reviewed Portland local-rule snapshot.
Statewide baseline
Maine requires at least 45 days' written notice for a residential rent increase. If an increase is 10% or more—or multiple increases in 12 months reach 10% or more—the landlord must provide at least 75 days' written notice before the increase that reaches that threshold. Rent also may not be increased while the dwelling violates the warranty of habitability, subject to the statute's tenant-caused exception. Municipal rules may add protections.
State reference: 14 M.R.S. §§ 6015–6016 and local rules
State official source Editorial & verification policyVerified Portland local-rule snapshot
For a Portland Covered Unit, the City-published Allowable Increase Percentage is 2.2% for calendar year 2026. Rent may generally be increased only once in a 12-month period and requires at least 90 days written notice. Eligible new-tenancy, banked-rent, and Rent Board-approved components can support a larger lawful increase, but the total increase may not exceed 10%; eligibility, base rent, banked rent, registration, exemptions, and any Rent Board approval must be verified before using more than the standard AIP.
Current listed local maximum: 2.2% · Calendar year 2026
2026 Allowable Increase Percentage: 2.2%
Maximum combined eligible increase: 10% — Use only when City records and the ordinance support eligible new-tenancy, banked-rent, and/or Rent Board-approved components. The standard 2026 AIP alone is 2.2%.
Published notice baseline: at least 90 days written notice; property/tenancy facts can require additional review.
Local source reviewed: 2026-09-17
Official local-rule sourceCoverage, exemptions, lawful base rent, banking rules, registration, tenancy type, and property-specific facts can still change the result.
Portland rent increase quick answer
State baseline: Maine requires at least 45 days' written notice for a residential rent increase. If an increase is 10% or more—or multiple increases in 12 months reach 10% or more—the landlord must provide at least 75 days' written notice before the increase that reaches that threshold. Rent also may not be increased while the dwelling violates the warranty of habitability, subject to the statute's tenant-caused exception. Municipal rules may add protections.
Local rule: For a Portland Covered Unit, the City-published Allowable Increase Percentage is 2.2% for calendar year 2026. Rent may generally be increased only once in a 12-month period and requires at least 90 days written notice. Eligible new-tenancy, banked-rent, and Rent Board-approved components can support a larger lawful increase, but the total increase may not exceed 10%; eligibility, base rent, banked rent, registration, exemptions, and any Rent Board approval must be verified before using more than the standard AIP.
Last verified: 2026-09-17
Official source: Local source linked above.
Common questions
Does Portland have separate rent increase rules?
For a Portland Covered Unit, the City-published Allowable Increase Percentage is 2.2% for calendar year 2026. Rent may generally be increased only once in a 12-month period and requires at least 90 days written notice. Eligible new-tenancy, banked-rent, and Rent Board-approved components can support a larger lawful increase, but the total increase may not exceed 10%; eligibility, base rent, banked rent, registration, exemptions, and any Rent Board approval must be verified before using more than the standard AIP.
Where should I start?
Start with the verified Maine baseline, then check the rules for the property and tenancy type.