Does Connecticut preempt local rent control ordinances?

Connecticut has no statute barring local rent regulation; instead it expressly authorizes municipal fair rent commissions — and, since January 1, 2026, requires every municipality of 15,000 or more residents to create or join one — with power to hear complaints and roll back excessive rents. The mandate first applied to municipalities of 25,000 or more in July 2023; under the amended statute every municipality required to have a commission must adopt the ordinance by January 1, 2028, and the commission may be the municipality's own, joint with neighboring towns, or regional.

Can a landlord raise the rent during a fixed-term lease in Connecticut?

Rent cannot be changed during a fixed term unless the lease so provides; the rent-increase notice statute expressly does not allow an increase during the term of a rental agreement (Conn. Gen. Stat. 47a-4e). An increase takes effect only after written notice at least 45 days ahead or, for a lease with a term of one month or less, notice equal to one full term, and a tenant's failure to respond is not agreement to the increase (47a-4e, for rental agreements entered into, renewed or extended on or after October 1, 2024). A mobile manufactured home park lease may not let the owner raise the total rent during its term (21-83(a)(5)), and a park increase at the end of an agreement needs written notice at least 30 days before the new agreement starts (21-80(b)(5)).

How much notice is required to raise the rent in Connecticut?

Verified October 1, 2026 All Connecticut topics →

Check your municipality. Connecticut does not preempt local rent regulation — city or county ordinances may impose rent caps, notice periods, and fee limits that are stricter than the state law on this page. Verify your municipality's ordinances before relying on any figure below. Verified local pages: Connecticut municipalities, Stamford.

What the state record says

Connecticut has no statewide rent cap or stabilization formula. It instead mandates local rent oversight: every municipality of 15,000 or more must maintain a fair rent commission, and those commissions can roll a rent back to a fair and equitable level when it is harsh and unconscionable. The mandate is Conn. Gen. Stat. 7-148b, as amended by Nov. Sp. Sess. P.A. 25-1, eff. 2026-01-01: every municipality with a population of 15,000 or more MUST maintain a fair rent commission (or join a joint or regional one), and any smaller municipality MAY create one. Commissions receive complaints about rents and 'rental charges' (including any fee on top of rent), and may roll a rent back to a fair and equitable level if, weighing the 13 factors in 7-148c (comparable rents, condition, services, repairs, taxes and debt service, code compliance, tenant income, amount and frequency of increases, reinvestment), it is 'so excessive ... as to be harsh and unconscionable' (7-148c, 7-148d). They can also suspend rent into escrow for health/safety violations and order landlords to stop retaliating against complainants; violations of commission orders draw fines of $25-$100 per offense, with each day beyond five a fresh offense (7-148d, 7-148f). Every municipality required to have a commission must adopt the ordinance on or before January 1, 2028, and a required municipality that created a commission before 2026 may not abolish it before then unless it joins a joint or regional commission (7-148b(c)). The original mandate (25,000+, deadline July 1, 2023) came from P.A. 22-30. Separately, using rent-setting algorithms that compute on nonpublic competitor data is an unlawful practice under the Connecticut Antitrust Act (chapter 624) as of January 1, 2026 (47a-4f).

Connecticut requires written notice of a rent increase at least 45 days before it takes effect, or, for a lease of one month or less, notice equal to one full term, which for a month-to-month tenancy is one full month (47a-4e) — and it MANDATES local fair rent commissions, which since January 1, 2026 every municipality of 15,000 or more people must maintain and which can roll back any rent or proposed increase found 'harsh and unconscionable.'

Cited to Conn. Gen. Stat. §§ 7-148b to 7-148f (fair rent commissions; 15,000-population mandate) 7-148b(b)-(c) and 7 more cited sources · Verified October 1, 2026

State law sets no cap on the size of an increase, and a tenant's failure to answer the notice is not agreement to the increase; the 3-day notice to quit is an eviction document, not a rent-increase notice. The real limits are structural: a tenant anywhere in a covered municipality can take an increase to the local fair rent commission, which weighs 13 statutory factors (comparable rents, building condition, taxes, the size and frequency of increases) and can order the rent limited to a fair and equitable amount; tenants who are 62+ or have disabilities in 5+ unit buildings have a statewide right to only fair-and-equitable increases; a rent increase demanded within six months of a tenant's code complaint, repair request, commission complaint or tenants'-union activity is presumed retaliatory; and rent-setting software using nonpublic competitor data is banned as of 2026. There is no statewide rent control, and no preemption of local action either — the state orders a form of local rent oversight rather than forbidding it.

Connecticut rent increase notice at a glance

Notice — month-to-month	30 days
Varies by increase size	Not addressed by statute
Fixed-term leases	Rent cannot be changed during a fixed term unless the lease so provides; the rent-increase notice statute expressly does not allow an increase during the term of a rental agreement (Conn. Gen. Stat. 47a-4e). An increase takes effect only after written notice at least 45 days ahead or, for a lease with a term of one month or less, notice equal to one full term, and a tenant's failure to respond is not agreement to the increase (47a-4e, for rental agreements entered into, renewed or extended on or after October 1, 2024). A mobile manufactured home park lease may not let the owner raise the total rent during its term (21-83(a)(5)), and a park increase at the end of an agreement needs written notice at least 30 days before the new agreement starts (21-80(b)(5)). For state-protected tenants — age 62+ or with qualifying disabilities, in buildings or complexes of five or more units or mobile-manufactured-home parks — any increase, whenever it takes effect, must be 'fair and equitable' under the 13 criteria of Conn. Gen. Stat. 7-148c, and refusal to agree to an increase that is NOT fair and equitable is not a lawful ground for eviction; the fair-and-equitable eviction ground is unavailable during an existing lease term (47a-23c(b)-(c)). Landlords of 5+ unit buildings must give every new or renewing tenant the Department of Housing plain-language notice of these protections (47a-23c(e), since January 1, 2024).
Statewide rent control / stabilization	No
Rent control details	Connecticut has no statewide rent cap or stabilization formula. It instead mandates local rent oversight: every municipality of 15,000 or more must maintain a fair rent commission, and those commissions can roll a rent back to a fair and equitable level when it is harsh and unconscionable. The mandate is Conn. Gen. Stat. 7-148b, as amended by Nov. Sp. Sess. P.A. 25-1, eff. 2026-01-01: every municipality with a population of 15,000 or more MUST maintain a fair rent commission (or join a joint or regional one), and any smaller municipality MAY create one. Commissions receive complaints about rents and 'rental charges' (including any fee on top of rent), and may roll a rent back to a fair and equitable level if, weighing the 13 factors in 7-148c (comparable rents, condition, services, repairs, taxes and debt service, code compliance, tenant income, amount and frequency of increases, reinvestment), it is 'so excessive ... as to be harsh and unconscionable' (7-148c, 7-148d). They can also suspend rent into escrow for health/safety violations and order landlords to stop retaliating against complainants; violations of commission orders draw fines of $25-$100 per offense, with each day beyond five a fresh offense (7-148d, 7-148f). Every municipality required to have a commission must adopt the ordinance on or before January 1, 2028, and a required municipality that created a commission before 2026 may not abolish it before then unless it joins a joint or regional commission (7-148b(c)). The original mandate (25,000+, deadline July 1, 2023) came from P.A. 22-30. Separately, using rent-setting algorithms that compute on nonpublic competitor data is an unlawful practice under the Connecticut Antitrust Act (chapter 624) as of January 1, 2026 (47a-4f).
Local rent regulation	Connecticut has no statute barring local rent regulation; instead it expressly authorizes municipal fair rent commissions — and, since January 1, 2026, requires every municipality of 15,000 or more residents to create or join one — with power to hear complaints and roll back excessive rents. The mandate first applied to municipalities of 25,000 or more in July 2023; under the amended statute every municipality required to have a commission must adopt the ordinance by January 1, 2028, and the commission may be the municipality's own, joint with neighboring towns, or regional.
Frequency limits	Not addressed by statute

Cite this page: "Landlord Atlas, Connecticut Rent Increase Notice Laws (verified October 1, 2026), landlordatlas.com/laws/rent-increase-notice/connecticut/" — free to cite and quote with a link (how these records are verified). Everything above is cited in the citations section below.

Create a Connecticut rent-increase notice — free, no signup, built on the same verified Connecticut law as this page.

Notes and caveats

45 days' written notice — and '3 days' is an eviction document — since October 1, 2024, a rent increase takes effect only if the landlord gave the tenant written notice of it at least 45 days before or, for a lease with a term of one month or less, notice equal to one full term; a tenant's silence is not agreement, and the section does not allow an increase during a lease term (47a-4e). The 3-day figure in 47a-23 is a notice to quit — an eviction document that must never be rendered as rent-increase notice.
The commission threshold dropped to 15,000 on January 1, 2026 — almost every circulating guide still gives the 25,000-population threshold from P.A. 22-30 (2022). Nov. Sp. Sess. P.A. 25-1 §35 cut it to 15,000 effective January 1, 2026, and gave every municipality required to have a commission until January 1, 2028 to adopt the ordinance.
Wrong-act trap: the mandate is P.A. 22-30, not P.A. 23-207 — the fair-rent-commission mandate is often misattributed to P.A. 23-207 — wrong act. P.A. 23-207 did the late-fee cap and the deposit deadline; P.A. 22-30 created the mandate.
Neither rent control nor preemption — a third-camp state — Connecticut does not merely tolerate local rent regulation, it MANDATES fair rent commissions (7-148b(b): population 15,000+, 'shall'; all others 'may') — so calling it a preemption state would invert the law. The commissions are case-by-case tribunals, not caps: no formula, no percentage, which is why the rent-control flag stays false.
Two 2026 bills DIED — some coverage reads otherwise — HB 5092 (the Governor's bill treating a rent increase after a property transfer above 5% or the consumer price index change as excessive, enforced through fair rent commissions) died on the House calendar at the 2026-05-06 adjournment without a floor vote in either chamber, though some mid-session coverage reads as if it passed; SB 257 (just-cause eviction expansion) died without a floor vote.
Increase frequency is a rollback factor, not a limit — 7-148c(12) makes the amount and frequency of increases one of the factors a commission weighs in a rollback — there is no standalone frequency limit.
Longer notice after a condominium conversion — A tenant whose home has been converted to part of a common interest community is on a different clock. During the transition period, which runs until nine months after the conversion notice or the end of the existing lease, whichever is later, the rent may not be raised at all. After that, an increase must be fair and equitable measured by the fair rent criteria in § 7-148c, and the tenant must get at least 60 days' notice of any proposed increase (§ 47-289) rather than the general 45 days' written notice (§ 47a-4e).

Common questions: Connecticut rent increase notice

Each answer is the verified value from the table above, restated as a direct answer. Free to quote with a link to this page.

How many days' notice must a landlord give before raising rent in Connecticut?: 30 days.
Does Connecticut have rent control?: No — Connecticut has no statewide rent control or stabilization. Connecticut has no statewide rent cap or stabilization formula. It instead mandates local rent oversight: every municipality of 15,000 or more must maintain a fair rent commission, and those commissions can roll a rent back to a fair and equitable level when it is harsh and unconscionable.
Does Connecticut preempt local rent control ordinances?: Connecticut has no statute barring local rent regulation; instead it expressly authorizes municipal fair rent commissions — and, since January 1, 2026, requires every municipality of 15,000 or more residents to create or join one — with power to hear complaints and roll back excessive rents. The mandate first applied to municipalities of 25,000 or more in July 2023; under the amended statute every municipality required to have a commission must adopt the ordinance by January 1, 2028, and the commission may be the municipality's own, joint with neighboring towns, or regional.
Can a landlord raise the rent during a fixed-term lease in Connecticut?: Rent cannot be changed during a fixed term unless the lease so provides; the rent-increase notice statute expressly does not allow an increase during the term of a rental agreement (Conn. Gen. Stat. 47a-4e). An increase takes effect only after written notice at least 45 days ahead or, for a lease with a term of one month or less, notice equal to one full term, and a tenant's failure to respond is not agreement to the increase (47a-4e, for rental agreements entered into, renewed or extended on or after October 1, 2024). A mobile manufactured home park lease may not let the owner raise the total rent during its term (21-83(a)(5)), and a park increase at the end of an agreement needs written notice at least 30 days before the new agreement starts (21-80(b)(5)).
How often can a landlord raise the rent in Connecticut?: Not addressed by statute.

Citations

Conn. Gen. Stat. §§ 7-148b to 7-148f (fair rent commissions; 15,000-population mandate) · 7-148b(b)-(c) (verified 2026) Official source
Conn. Gen. Stat. § 47a-4e (notices of increase in rent: 45 days, or one full term for a lease of one month or less; P.A. 24-143 § 17, for rental agreements entered into, renewed or extended on or after October 1, 2024) · § 47a-4e (verified 2026) Official source
Conn. Gen. Stat. §§ 7-148c, 7-148d, 7-148f (harsh-and-unconscionable standard, rollback orders, penalties) (verified 2026) Official source
Conn. Gen. Stat. § 47a-23c (protected tenants: fair-and-equitable increase limit) · (b)(1)(B), (c), (e) (verified 2026) Official source
Conn. Gen. Stat. § 47a-20 (rent increase within 6 months of protected tenant action presumed retaliatory) (verified 2026) Official source
Conn. Gen. Stat. § 47a-23 (notice to quit — 3 days; NOT a rent-increase notice; cited as the derivation) · (a) (verified 2026) Official source
Conn. Gen. Stat. § 47a-4f (rent-setting algorithm ban, Nov. Sp. Sess. P.A. 25-1 § 32, eff. 2026-01-01) (verified 2026) Official source
Conn. Gen. Stat. § 47-289 (rent increases of conversion tenants) · (a), (b) (verified 2026) Official source

How this record was verified: Direct read of statute text on the official Connecticut General Assembly site (cga.ct.gov): chapters 830, 831, 832 and 98 downloaded in full from the current-revision pages AND from the 2026 Supplement (revised to January 1, 2026), which carries the 2025-session amendments to Conn. Gen. Stat. 47a-15a, 47a-21, 47a-23 and 7-148b — the supplement text is the operative text used here. Every number that decides an answer here was read at least twice in independent documents: the 2-month/1-month deposit caps, 21-day/15-day return deadline, double-deposit penalty, deposit-index interest rule, 9-day/4-day grace periods, $5-per-day/$50/5%-of-delinquent-payment late-fee cap, and the reasonable-notice entry standard were each confirmed verbatim on the official pages; the 2025 changes (fair-rent-commission threshold 25,000 to 15,000, +5-day online-payment-outage grace extension, rent-algorithm ban) were confirmed in both the 2026 Supplement and the enrolled November Special Session Public Act 25-1 (HB 8002) PDF on cga.ct.gov; the 30-to-21-day deposit-deadline change and late-fee cap were traced to PA 23-207 sections 8, 38 and 39 (effective 2023-10-01) in the enrolled act PDF. The 2026 security-deposit interest rate (0.49% deposit index) was double-read on two official Department of Banking pages. 2026-session sweep: PA 26-79 section 3 (SB 218) read in the enrolled PDF and incorporated when it took effect on October 1, 2026; bill-status pages read for HB 5092, HB 5359, SB 257 and SB 274, all of which died at the 2026-05-06 adjournment. September 5, 2026 addendum: the decisive figures touched by the 2025-2026 enactments reviewed that day were re-read on the official host — §§ 7-148b, 47a-4d, 47a-4f, 47a-15a, 47a-21 and 47a-23 in the 2026 Supplement on cga.ct.gov, with the 2026 public acts; the earlier reads stand as recorded. September 12, 2026 addendum: the security deposit figures in § 47a-21(b), (d), (h), (i), (j) and (k), the § 47a-15a grace periods and late-charge cap, and the § 47a-16 entry standard were re-read on cga.ct.gov (the 2026 Supplement for chapters 830 and 831 and the base revision for § 47a-16); §§ 47a-7c, 47-283 to 47-293 and 1-268 were read there the same day. The earlier reads stand as recorded. October 1, 2026 addendum: the 2026 public acts that took effect that day — P.A. 26-79 § 3 (§ 47a-21(j)(1)), P.A. 26-113 § 1 (§ 47a-4), P.A. 26-11 § 15 (§ 47a-23c) and P.A. 26-77 §§ 15, 16, 26 and 27 (§§ 46a-64 and 46a-64c) — were re-read in the enrolled acts on cga.ct.gov, with § 36a-50 for the civil-penalty ceiling; the General Statutes pages do not yet print them. The same day, every section the security deposit, rent increase, late fee, entry and eviction answers rest on was read again on cga.ct.gov: chapters 98, 412, 828, 830, 831, 832, 833 and 834 in the General Statutes revised to January 1, 2025, and each section the 2026 Supplement reprints in the Supplement. That reading added § 47a-4e (P.A. 24-143, § 17), the rent-increase notice section in force since October 1, 2024, which the rent increase answers had not stated. The Practice Book (2026 edition) and the Judicial Branch's summary process publications were read on jud.ct.gov.