Sample Security Deposit Demand Letter for Connecticut (2026)

If your Connecticut landlord hasn't returned your security deposit, a written demand letter citing Conn. Gen. Stat. § 47a-21 is usually the step that gets it back — and Connecticut backs that letter with one of the sharper penalties in the country: twice the deposit you paid, plus interest.

This guide shows you a complete sample demand letter for Connecticut, explains how the return deadline actually works (it's a two-part clock, and your own letter can be part of it), and flags the outdated deadline figure that still circulates on much of the internet.

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Connecticut's Deadline: 21 Days — Not 30

Here's the single most important fact, because so many sources get it wrong: Connecticut's deposit-return deadline is 21 days. It was reduced from 30 days effective October 1, 2023, and plenty of older articles, templates, and even landlord form letters still cite the stale 30-day figure.

That outdated number matters in both directions. A landlord relying on an old template may believe they have more time than they do. And a tenant relying on an old article may wait longer than necessary before demanding their money. Your demand letter should use the current rule — and citing it correctly signals to the landlord that you've done the homework.

The Two-Part Clock (Whichever Is Later)

Under § 47a-21, your landlord must return your deposit — with accrued interest — or deliver a written, itemized statement of any damages, within whichever of these is later:

1. 21 days after your tenancy ends, or
2. 15 days after the landlord receives your forwarding address in writing.

That second prong is the one tenants overlook. If you never gave your landlord a written forwarding address, the 15-day branch of the clock may not have started yet — which doesn't excuse the landlord forever, but it does change what your letter should say. More on that below.

If you did provide a written forwarding address at or near move-out, both prongs run, the later one controls, and a landlord who has blown past it is in violation.

What a Landlord Who Misses the Deadline Owes

Connecticut's penalty provision, § 47a-21(d)(2), makes a landlord who violates the return-and-statement requirements liable for twice the amount of the full security deposit you paid — plus the accrued interest on it.

Note the base carefully: it's twice the deposit you paid, not merely twice whatever portion was withheld. On a $1,800 deposit, that's $3,600 of court exposure, plus interest — before the landlord has spent a dollar defending the case.

Two honest caveats that keep your letter credible:

• The double award is what a court can order if you sue and win. Your demand letter's job is to demand the deposit itself, with interest, and make the landlord's downside clear — not to claim the doubled amount is already owed to you today.
• Connecticut's deposit statute awards no attorney's fees. Letters that threaten "you'll also pay my lawyer" under § 47a-21 are overreaching, and a landlord's attorney will spot it immediately. The double-deposit exposure is strong enough on its own.

One more Connecticut-specific point: your deposit is required to earn interest at a state-set rate while the landlord holds it, so a correct demand includes the interest, not just the principal.

Sample Connecticut Security Deposit Demand Letter

Here's what a properly structured Connecticut demand letter looks like. The scenario: the tenant gave a written forwarding address at move-out, vacated June 20, and the landlord has returned nothing and sent nothing for seven weeks — both prongs of the clock have plainly run.

Notice what this letter does — and doesn't do:

• It states the current 21-day rule and the full two-part clock, including the written-forwarding-address prong — and confirms in writing that both have run. No landlord's attorney can answer it with the stale 30-day figure.
• It restates the forwarding address in writing. Even when the address was given before, restating it in the letter removes any argument that the 15-day prong never started.
• It demands the deposit plus interest — the amount actually due today — and presents the doubled amount as the court exposure it is, not as a sum already owed. That precision is what keeps the threat credible.
• It closes the side doors. Documented condition, no unpaid rent or fees — the two excuses landlords reach for first are addressed before they're raised.
• It makes no attorney-fee threat, because § 47a-21 grants none. Every claim in the letter is one the statute actually supports.

If You Never Gave a Written Forwarding Address

This is where Connecticut's clock gets interesting. If you moved out without providing your forwarding address in writing, the 15-day branch of the deadline may not have started — meaning your landlord may not technically be in violation yet, no matter how long ago you moved out.

The fix is simple: your demand letter itself supplies the written forwarding address. The moment the landlord receives it, the 15-day period begins. Your letter shifts from "you've violated the statute" to "here is my forwarding address in writing; § 47a-21 now requires return of my deposit with interest, or an itemized statement, within the statutory window" — and puts a hard date on the calendar.

Not sure which situation you're in? Our free security deposit deadline calculator works out Connecticut's later-of clock from your actual dates — including whether the clock has even started.

How to Send It

Send the letter by USPS Certified Mail with Return Receipt. In Connecticut this does double duty: it proves the landlord received your demand, and — if you're supplying your forwarding address for the first time — it establishes exactly when the landlord received it in writing, which is the event that starts the 15-day prong. Keep the tracking number, the return receipt, and a copy of the signed letter.

Then wait out your deadline. If the landlord pays, you're done. If not, the letter and the certified-mail receipt become the backbone of a Connecticut small claims case — where the double-deposit provision does its real work.

Frequently Asked Questions

How long does a landlord have to return a security deposit in Connecticut? 21 days after the tenancy ends, or 15 days after receiving the tenant's forwarding address in writing — whichever is later. The 21-day deadline took effect October 1, 2023.

I read that Connecticut landlords have 30 days. Is that true? Not anymore. The deadline was reduced from 30 to 21 days effective October 1, 2023. Sources citing 30 days are out of date.

What's the penalty if my landlord misses the deadline? A court can award twice the amount of the full security deposit you paid — not just the portion withheld — plus the accrued interest, under § 47a-21(d)(2).

Does my deposit earn interest in Connecticut? Yes. Landlords must hold deposits in an escrow account and pay interest at a state-set rate. A complete demand includes the accrued interest.

I never gave my landlord a forwarding address. Am I out of luck? No — but your deadline may not have started. Put your forwarding address in your demand letter and send it certified mail; that starts the 15-day period under § 47a-21.

Do I need a lawyer to send a demand letter in Connecticut? No. Deposit disputes are a core small-claims matter, and a well-drafted, statute-cited letter resolves many cases before court is ever needed.

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Get a Letter Built for Your Exact Situation

The sample above fits one specific fact pattern. Yours may differ — a partial refund, a late itemized statement, a move-out with no forwarding address on file — and § 47a-21 treats each differently.

TenantShield generates a Connecticut-specific demand letter built around your facts: the correct later-of deadline mechanics, the double-deposit exposure framed the way a court would actually see it, and a court-ready structure — in minutes, for $39. Every deadline and citation is verified against the current Connecticut statute.

Generate your Connecticut demand letter →

Also see: Connecticut security deposit law — deadlines and penalties · What to include in a security deposit demand letter · What to do if your landlord won't return your deposit · Sample demand letters for every state · Security deposit deadline calculator

This article is general information about Connecticut law, not legal advice for your specific situation.