Maine Rent Increase Laws: The Landlord and Tenant Guide
45-Day Notice · 75 Days at 10 Percent · No Statewide Cap · Portland Rent Control · Habitability Limit · Retaliation Protections
Maine is unusual: it sets no statewide ceiling on how much a landlord may raise the rent, but it enforces one of the strongest statewide notice rules in the country. Under Maine Revised Statutes Title 14, section 6015, a rent increase on a residential tenancy needs at least 45 days’ written notice — and 75 days once the increase reaches 10 percent. On top of that sit a habitability limit under section 6016, anti-retaliation protections under section 6001, the Maine Human Rights Act’s source-of-income rule, and, inside the city of Portland, a voter-adopted rent control ordinance that does cap the number. Get the framework right and your increase holds; miss a piece and the tenant can refuse the overage and recover what was collected unlawfully.
The stakes are concrete. Section 6015 makes any waiver of the notice requirement void as against public policy, and a landlord who collects an increase without proper notice can be ordered to return the sums obtained, with interest, plus the tenant’s reasonable attorney’s fees and costs. Because Portland’s allowable percentage is recalculated every year and the fair-housing and rent-control rules are amended periodically, treat every figure here as a starting point and verify the current number for your city before you serve anything.
Below, a detailed overview video summarizes the Maine framework; the sections that follow break down each piece — the 45 and 75-day notice rules, when you may raise rent at all, the absence of a statewide cap, Portland’s rent control, the habitability limit, retaliation and fair housing, and a step-by-step landlord playbook — plus a Maine-specific FAQ.
Maine Rent Increase Rules at a Glance
Statewide Cap
None (notice rule only)
Notice Required
45 days · 75 days at 10% or more
Mid-Lease
Not allowed unless lease permits
Local Control
Portland caps increases
The 45 and 75-Day Notice Rule
The centerpiece of Maine rent-increase law is Maine Revised Statutes Title 14, section 6015, titled “Notice of rent or mandatory recurring fee increase.” It was substantially rewritten in 2023, and it governs statewide. The core rule is simple: before a landlord raises the rent — or adds or raises a mandatory recurring fee — on a residential unit, the landlord must give the tenant at least 45 days’ written notice.
Seventy-Five Days Once the Increase Hits 10 Percent
Section 6015 layers a longer period on larger increases. If the increase is 10 percent or more, the landlord must give at least 75 days’ written notice instead of 45. The statute also closes the obvious loophole: if a landlord raises rent more than once within a 12-month period and the increases add up to a total of 10 percent or more, the 75-day notice applies to the increase that brings the running total to 10 percent or more. In other words, the 10 percent line is measured cumulatively across the trailing year, not just by the size of the single increase in front of you.
“Mandatory recurring fee” counts too
Section 6015 does not stop at base rent. It reaches a mandatory recurring fee — a charge the tenant must pay on a repeating basis. Adding such a fee, or raising one, is treated like a rent increase for notice purposes, so the same 45-day (or 75-day) written notice applies. If you are introducing a new monthly charge, plan the notice as if you were raising the rent itself.
A waiver of the notice is void — and violations are costly
The statute states that a written or oral waiver of the notice requirement is against public policy and void, so a lease clause cannot shorten the 45 or 75 days. A landlord who violates the section is liable to return any sums unlawfully obtained from the tenant, with interest, plus reasonable attorney’s fees and costs. An under-noticed increase is not a technicality — the overage is recoverable by the tenant.
Certain subsidized and deed-restricted housing is treated differently
The 75-day enhancement for larger increases does not apply the same way to housing whose rent is already governed by an affordability deed restriction or by a federal, state, or local subsidy program, because those programs set their own rent-change rules. If your unit is subsidized or deed-restricted, follow the program’s procedures and confirm how section 6015 interacts with them before serving a notice.
Takeaway
Maine’s statewide rule is about notice, not amount: at least 45 days’ written notice for any rent or recurring-fee increase, and 75 days once the increase reaches 10 percent or more over a 12-month window, under Title 14, section 6015. The notice cannot be waived, and an under-noticed increase can be clawed back with interest and fees.
When You Can Raise the Rent at All
The notice rule only matters once you actually have the right to raise the rent. That right depends on the tenancy.
During a Fixed-Term Lease: Generally Locked
While a fixed-term lease is running, the rent is set at the agreed amount for the whole term. You cannot raise it mid-term unless the lease itself contains an explicit clause that permits the change. Absent that clause, the tenant is entitled to the agreed rent through the end of the term, and a mid-term increase is unenforceable.
At Renewal or on a Tenancy at Will
The two ordinary windows to raise rent are at renewal, when a new term begins, and during a tenancy at will — Maine’s term for a month-to-month tenancy — where a landlord may change the rent going forward by serving the proper section 6015 notice. On a tenancy at will, the increase takes effect only after the full 45-day or 75-day notice period runs; the tenant can accept the new rent and stay, or give proper notice and move out.
A rent increase is not a notice to quit — two different statutes
Do not confuse raising the rent with ending the tenancy. Raising rent on a tenancy at will uses section 6015 (45 or 75 days). Terminating a tenancy at will uses a separate statute, Title 14, section 6002, which generally requires at least 30 days’ written notice — and as little as 7 days in specific fault situations, such as serious unrepaired damage, creating a nuisance, or being seven or more days behind on rent. If your goal is to raise the rent, serve a section 6015 rent-increase notice, not a termination notice; for ending a tenancy see our guide to Maine eviction notice laws and Maine lease termination laws.
A mid-term increase without authority is void
Trying to raise rent partway through a fixed-term lease with no authorizing clause does not simply fail quietly — the increase is unenforceable, and a tenant who keeps paying the original rent is in the right. Do not treat a tenant’s silence as agreement. Wait for renewal, or convert to a lawful tenancy-at-will process, before adjusting the rent.
Takeaway
You may raise rent at renewal or on a tenancy at will with proper notice, but never mid-term on a fixed lease unless the lease expressly allows it. And keep the two notices straight: section 6015 raises the rent; section 6002 ends the tenancy.
No Statewide Cap — But Real Limits Remain
Unlike California or Oregon, Maine imposes no statewide percentage or dollar cap on how much a landlord may raise the rent. Statewide law regulates the process, not the amount. But “no cap” does not mean “anything goes” — several substantive limits still constrain a Maine increase.
The Habitability Limit Under Section 6016
Title 14, section 6016 provides that rent charged for a residential unit may not be increased while the dwelling is in violation of the implied warranty of habitability. The one carve-out is that a violation caused by the tenant, the tenant’s family, guests, or invitees does not bar an increase. Like section 6015, a waiver of this rule is void, and a landlord who raises rent on an uninhabitable unit can be ordered to return the sums obtained, with interest and reasonable attorney’s fees and costs. In practice, this means you cannot pair a rent hike with an unresolved habitability defect — fix the condition first.
Frequency is unlimited statewide, but be careful
Maine’s statewide law does not limit how often you may raise rent — only the notice each increase requires. But remember the cumulative 10 percent rule: several increases in a 12-month window that together reach 10 percent trigger the 75-day notice for the one that crosses the line. And in a rent-controlled city such as Portland, frequency is limited, typically to one increase per rental year. Check the local ordinance before scheduling more than one increase in a year.
Takeaway
There is no statewide cap on the size of a Maine rent increase, but section 6016 bars an increase while the unit is uninhabitable, the notice rule always applies, and retaliation and fair-housing law sit on top. “No cap” is not “no rules.”
Portland Rent Control: The Local Overlay That Caps the Number
The big exception to Maine’s no-cap framework is Portland. In November 2020, Portland voters adopted a rent control ordinance by referendum, and the city has amended it since. Inside Portland, the ordinance is stricter than the statewide notice-only rule, so it controls: it puts an actual percentage cap on the yearly increase for most covered units.
How Portland’s Allowable Increase Works
For most covered units, Portland ties the maximum yearly increase to a share of the change in the Consumer Price Index for the Greater Boston metropolitan area. The city recalculates and publishes the allowable percentage each year (set on a September 1 cycle), so the permitted number moves with inflation and is typically small — for 2026 the allowable increase has been reported at roughly 2.2 percent. Because amendments have adjusted the exact share of CPI used, always pull the current published figure from the city rather than reusing a prior year’s number.
Turnover, banking, and base rent in Portland
Portland limits rent even between tenants. When a covered unit becomes vacant through a voluntary move-out, the ordinance allows only a modest re-rental increase (reported at about 5 percent) rather than an unrestricted reset to market. A unit’s “base rent” traces back to a reference date set by the ordinance, and an allowable increase a landlord chooses not to take can, within limits, be “banked” and applied later. These mechanics have shifted with amendments, so verify the current re-rental cap, banking rule, and base-rent date with the Portland rent board before setting a new tenant’s rent.
Coverage and exemptions vary — and the rent board enforces
Portland’s ordinance covers most residential rentals but exempts categories such as buildings first constructed after the ordinance took effect, certain owner-occupied buildings with a small number of units, and units in hotels, inns, and similar lodging. The city’s housing office administers the ordinance and acts as a rent board with power to order rent reductions, oversee repairs, and impose penalties on landlords who exceed the cap. Confirm whether your specific building is covered and, if it is, follow the ordinance’s notice and registration steps in addition to the statewide 45-day rule.
Takeaway
Inside Portland, a voter-adopted rent control ordinance caps the yearly increase at a share of the Greater Boston CPI (about 2.2 percent for 2026), limits turnover increases, and is enforced by a rent board — and it controls because it is stricter than the statewide notice rule. Verify the current allowable percentage and coverage for the property’s exact address.
Retaliation and Fair Housing Limits
Two more limits apply on top of the notice rule and any local cap, and an increase that clears those can still be unlawful if it trips either one.
A Rent Increase Cannot Be Retaliatory
Maine law prohibits a landlord from retaliating against a tenant for exercising a legal right, and a rent increase is a form of retaliatory conduct the law reaches. Under Title 14, section 6001, a rebuttable presumption of retaliation arises when an adverse action follows within six months of a protected act — for example, complaining in good faith to a code-enforcement body about conditions that may violate a building, housing, or sanitary code; making a written repair request; filing a fair-housing complaint; or being involved with a tenants’ organization. When the presumption applies, the burden shifts to the landlord to prove a legitimate, non-retaliatory business reason. The safest practice is to time increases to the ordinary schedule and to document the market and cost reasons behind the number.
It Cannot Discriminate or Target a Source of Income
A rent increase also cannot be used to discriminate against a protected class under the federal Fair Housing Act and the Maine Human Rights Act — which covers race, color, religion, sex, sexual orientation, gender identity, national origin, ancestry, physical or mental disability, familial status, and more. Maine further protects source of income: a landlord may not refuse to rent to, advertise against, screen more strictly, or raise rent to push out a tenant because the tenant uses a lawful housing subsidy such as the Section 8 Housing Choice Voucher. Complaints go to the Maine Human Rights Commission. Confirm the current statute, because the fair-housing provisions are periodically updated.
Consistency is your best defense
Increases applied evenly across comparable units on a regular schedule are far easier to defend than a one-off increase aimed at a single tenant. A selectively applied hike, or one that lands right after a complaint, invites both a retaliation presumption and a fair-housing claim — even where no cap applies to the dollar figure.
Takeaway
An increase can still be unlawful if it is retaliatory — presumed under section 6001 when it follows a protected act within six months — or discriminatory, including targeting a lawful source of income like a Section 8 voucher under the Maine Human Rights Act. Apply increases consistently, on schedule, with a documented business reason.
The Maine Landlord Playbook
Put the whole framework into a repeatable sequence and a rent increase becomes routine instead of risky. Follow these steps every time.
Confirm tenancy type and lease authority
Determine whether the tenant is on a fixed-term lease (rent generally locked mid-term) or a tenancy at will (adjustable with notice). A mid-term increase needs an express lease clause.
Check for a local cap
Confirm whether the property sits in a rent-controlled city such as Portland. If it does, pull the current allowable percentage and the turnover and registration rules, and treat those as the binding limit.
Confirm the unit is habitable
Under section 6016 you cannot raise rent while the unit violates the warranty of habitability (unless the tenant caused the defect). Resolve any outstanding condition before you serve notice.
Serve the correct 45 or 75-day notice
Use at least 45 days’ written notice, or 75 days once the increase reaches 10 percent or more over the trailing 12 months. State the current rent, new rent, and effective date in writing, and remember a mandatory recurring fee counts.
Deliver provably and document everything
Serve by a provable method such as certified mail with return receipt or personal delivery with a signed acknowledgment, and keep the notice, proof of delivery, and a note of the market and cost reasons. Consistent, documented increases are the ones that hold up.
Need the notice itself?
A ready-to-fill notice keeps the required fields in place. See our free Maine rent increase notice form, and the Maine lease agreement form if you need an escalation clause or a fresh renewal term. Always tailor the numbers to your unit and verify current law.
Common Scenarios, Quickly Answered
✓ Usually Defensible
- Renewal increase with notice. A written 45-day (or 75-day) notice before renewal, stating current rent, new rent, and effective date.
- Tenancy-at-will raise with proper notice. A written 45-day notice for a single-digit percentage increase on a habitable unit outside a rent-controlled city.
- Portland increase within the cap. An increase at or under the city’s published allowable percentage, with the ordinance’s notice and registration steps followed.
- Consistent annual adjustment. The same schedule applied across comparable units, with documented comparables and no link to protected activity.
✕ Likely Unlawful
- Under-noticed increase. Fewer than 45 days, or fewer than 75 days once the increase reaches 10 percent — the overage is recoverable.
- Mid-term hike, no clause. Raising rent during a fixed lease with no authorizing clause.
- Increase on an uninhabitable unit. A raise under section 6016 while a habitability violation the tenant did not cause remains unfixed.
- Post-complaint or over-cap. A raise soon after a code complaint (a retaliation presumption), or above Portland’s allowable percentage inside the city.
Rent Increases Go Smoother With the Right Tenant
The tenants who fight every lawful increase are often the ones who show red flags on screening. Comprehensive credit, income, and eviction-history reports catch the mismatch before you ever sign a lease.
Frequently Asked Questions
How much notice must a Maine landlord give before raising rent?
Under Maine Revised Statutes Title 14, section 6015, a landlord must give at least 45 days’ written notice before increasing rent or a mandatory recurring fee on a residential tenancy. If the increase is 10 percent or more, the landlord must give at least 75 days’ written notice. When several increases within a 12-month period add up to 10 percent or more, the 75-day notice applies to the increase that carries the running total to 10 percent. A written or oral waiver of the notice requirement is void as against public policy, so a lease clause cannot shorten it. Verify the current statute before you serve a notice.
Is there a statewide rent cap in Maine?
No. Maine has no statewide limit on how much a landlord may raise the rent. Statewide law under Title 14, section 6015 controls how much notice you must give, not how large the increase can be. The one statewide substantive limit is section 6016, which bars a rent increase while the unit is in violation of the implied warranty of habitability unless the tenant caused the defect. A hard percentage cap exists only where a municipality has adopted rent control, most notably Portland. Confirm whether your city has an ordinance before relying on the absence of a cap.
Does Portland, Maine have rent control?
Yes. Portland voters adopted a rent control ordinance by referendum in November 2020, and it has been amended since. For most covered units it ties the yearly allowable increase to a share of the Greater Boston Consumer Price Index, so the permitted percentage is small and is recalculated each year; for 2026 the allowable increase is roughly 2.2 percent. Portland also limits how far rent can rise at turnover and runs a rent board with enforcement power. Because Portland’s rule is stricter than the statewide notice-only framework, it controls inside the city. Verify the current allowable percentage and the exact ordinance for the property’s address.
Can a landlord raise the rent in the middle of a lease in Maine?
Generally no. During a fixed-term lease the rent is locked at the agreed amount for the whole term unless the lease itself contains a clause that expressly allows a mid-term increase. A landlord may raise rent at renewal, or during a tenancy at will (month-to-month), by serving the proper 45-day or 75-day written notice under Title 14, section 6015. On a tenancy at will, the increase takes effect only after the full notice period runs.
What is the difference between a rent-increase notice and a notice to end a tenancy in Maine?
They are two separate statutes. A rent increase on a tenancy at will requires the 45-day or 75-day written notice under Title 14, section 6015. Ending a tenancy at will requires a separate written notice under Title 14, section 6002, which is generally at least 30 days (and as little as 7 days in specific fault situations such as serious damage or being seven or more days behind on rent). Raising rent and terminating a tenancy are governed by different sections and different notice periods, so do not confuse the two.
How does Portland’s rent control handle a vacancy or a new tenant?
Portland’s ordinance limits, rather than fully frees, the rent at turnover. When a covered unit becomes vacant through a voluntary move-out, the ordinance allows only a modest re-rental increase (reported at about 5 percent) rather than an unrestricted reset to market. The base rent tracks back to a reference date set by the ordinance, and unused allowable increases can sometimes be banked and used later within limits. These figures and mechanics have changed with amendments, so confirm the current re-rental rule with the Portland rent board before setting a new tenant’s rent.
Can a rent increase be illegal even if there is no cap?
Yes. Even where no percentage cap applies, an increase can be unlawful if it is retaliatory, if the unit is in violation of the warranty of habitability under Title 14, section 6016, if it discriminates against a protected class under the federal Fair Housing Act or the Maine Human Rights Act, or if it targets a tenant’s lawful source of income such as a housing voucher. Maine’s retaliation rule under Title 14, section 6001 presumes retaliation when an adverse action, including a rent increase, follows a protected act (like a good-faith code complaint) within six months, shifting the burden to the landlord.
Can a Maine landlord refuse a tenant with a Section 8 voucher?
No. The Maine Human Rights Act prohibits housing discrimination based on a lawful source of income, which includes federal, state, and local housing subsidies such as the Section 8 Housing Choice Voucher. A landlord cannot refuse to rent to, advertise against, apply stricter screening to, or raise rent to push out a tenant because the tenant uses a voucher or other rental assistance. Complaints go to the Maine Human Rights Commission. Confirm the current statute, because the fair-housing provisions are periodically updated.
How often can a landlord raise rent in Maine?
Statewide law does not limit how often a landlord may raise rent, only the notice each increase requires under Title 14, section 6015 (45 days, or 75 days once the running 12-month total reaches 10 percent or more). Local rent control changes this. Portland generally allows only one increase per rental year and caps the amount, so inside the city the frequency and size are both restricted. Check the local ordinance before scheduling more than one increase in a year.
Does the 45-day notice rule apply to fees, not just base rent?
Yes. Title 14, section 6015 applies to an increase in rent or in a mandatory recurring fee. A recurring charge the tenant must pay, added or raised, is treated like a rent increase for notice purposes, so the 45-day (or 75-day) written notice applies. The statute also makes a waiver of the notice requirement void, and a landlord who violates it can be liable for the return of sums unlawfully obtained, with interest, plus reasonable attorney’s fees and costs. Verify current law before adding or raising any recurring fee.
What is the safest way for a Maine landlord to raise rent?
Confirm the tenancy type and whether a fixed-term lease locks the rent, check whether the property sits in a rent-controlled city such as Portland and calculate the allowable amount there, give at least 45 days’ written notice (75 days for an increase of 10 percent or more) by a provable method, avoid raising rent mid-term without a lease clause or right after protected tenant activity, make sure the unit meets the warranty of habitability, and keep a copy of the notice and proof of delivery. Documenting a legitimate, non-retaliatory business reason turns a routine increase into one that holds up.
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