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

Verified July 10, 2026 All Connecticut topics →

Check your municipality. Connecticut does not preempt local rent regulation — city or county ordinances may impose rent caps, notice rules, and fee limits that are stricter than the state-level rules on this page and are not covered here. Verify your municipality's ordinances before relying on any figure below.

What the state record says

No statewide rent cap or stabilization formula. Connecticut instead MANDATES local rent oversight: under 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). Newly covered municipalities (15,000-24,999) have until January 1, 2028 to adopt the ordinance; commissions existing before 2026 cannot be abolished before then. 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 unfair trade practice as of January 1, 2026 (47a-4f).

Pending legislation — not yet law. The rules on this page reflect current law only. The following bill would change it if enacted:

SB 218 (2026) — Public Act 26-79, Section 3 — Enacted but NOT yet effective. Amends Conn. Gen. Stat. 47a-21(j)(1) so that the Banking Commissioner, on finding a security-deposit violation within the commissioner's jurisdiction (deposit-amount cap, return/itemization duties, escrow duties, or interest duties), may order the landlord to PAY A CIVIL PENALTY under Conn. Gen. Stat. 36a-50 (up to $100,000 per violation) in addition to the existing cease-and-desist and compliance orders. Adds real administrative teeth to the deposit rules; incorporate into security_deposits penalty_for_violation on the first verification pass after the effective date.Status: Passed Senate 2026-04-15 and House 2026-05-05, signed by the governor 2026-05-27 as Public Act 26-79; Section 3 effective October 1, 2026. (checked 2026-07-10).

Connecticut has no statute requiring a set number of days' notice before a rent increase — but it is the only state that 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.' For ordinary month-to-month tenants, state law fixes no advance-notice period and no cap; the only statutory notice in the area is the 3-day notice to quit, which 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	No rent-increase statute — notice derives from tenancy-termination rules (see summary)
Varies by increase size	Not addressed by statute
Fixed-term leases	Rent cannot be changed during a fixed term unless the lease so provides (contract principle; no section of chapters 830-832 addresses mid-term increases). 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	No statewide rent cap or stabilization formula. Connecticut instead MANDATES local rent oversight: under 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). Newly covered municipalities (15,000-24,999) have until January 1, 2028 to adopt the ordinance; commissions existing before 2026 cannot be abolished before then. 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 unfair trade practice as of January 1, 2026 (47a-4f).
Local rent control preempted	No
Frequency limits	Not addressed by statute

Notes and caveats

Encoding decisions: notice_days_month_to_month=null because chapters 830-832 (read in full, current text plus 2026 Supplement) contain no rent-increase notice statute; the 3-day figure in 47a-23 is an eviction notice-to-quit and must never be rendered as rent-increase notice. rent_control_state=false AND local_control_preempted=false — Connecticut is a third-camp state like the MN encoding but stronger: the state does not merely tolerate local rent regulation, it MANDATES fair rent commissions (7-148b(b): population 15,000+, 'shall'; all others 'may'), so encoding preemption true would invert the law. The commissions are case-by-case tribunals, not caps — no formula, no percentage, so rent_control_state stays false with the machinery in rent_control_details. STALE-SOURCE TRAPS: (1) the 25,000-population threshold (P.A. 22-30, 2022) still appears in almost every circulating guide — Nov. Sp. Sess. P.A. 25-1 § 35 cut it to 15,000 effective 2026-01-01 (double-read: 2026 Supplement text and the enrolled HB 8002 PDF showing '[twenty-five] fifteen'), with the ordinance deadline for newly covered municipalities set at 2028-01-01; (2) the fair-rent-commission mandate is often misattributed to PA 23-207 — wrong act: PA 23-207 did the late-fee cap and deposit deadline, PA 22-30 did the mandate; (3) claims that CT requires 30/45 days' notice for increases have no statutory basis. DEAD 2026 BILLS (debunked, not flagged): HB 5092 (Governor's 5%-cap-on-transfer bill, enforceable via FRCs) died on the House calendar at the 2026-05-06 adjournment without a floor vote in either chamber — some mid-session coverage reads as if it passed; SB 257 (just-cause eviction expansion) died without a vote for the third straight year. frequency_limits=null: 7-148c(12) makes frequency a rollback FACTOR, not a limit.

Statute citations

Conn. Gen. Stat. §§ 7-148b to 7-148f (fair rent commissions; 15,000-population mandate) 7-148b(b)-(c) Official source
Conn. Gen. Stat. §§ 7-148c, 7-148d, 7-148f (harsh-and-unconscionable standard, rollback orders, penalties) Official source
Conn. Gen. Stat. § 47a-23c (protected tenants: fair-and-equitable increase limit) (b)(1)(B), (c), (e) Official source
Conn. Gen. Stat. § 47a-20 (rent increase within 6 months of protected tenant action presumed retaliatory) Official source
Conn. Gen. Stat. § 47a-23 (notice to quit — 3 days; NOT a rent-increase notice; cited as the derivation) (a) Official source
Conn. Gen. Stat. § 47a-4f (rent-setting algorithm ban, Nov. Sp. Sess. P.A. 25-1 § 32, eff. 2026-01-01) 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 load-bearing number 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 both the official pages and the Justia 2024-edition mirror (fetched raw); 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 flagged as pending (effective 2026-10-01); bill-status pages read for HB 5092, HB 5359, SB 257 and SB 274, all of which died at the 2026-05-06 adjournment.