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Connecticut · Conn. Gen. Stat. §29-453Connecticut smoke and carbon monoxide detector affidavit: what the seller signs at closing

At the closing of a transaction involving a residential building designed for one or two families, or a unit in a residential common interest community, the Connecticut seller presents the buyer an affidavit, signed and dated, stating that the building or unit has smoke detection and warning equipment complying with the statute, and either carbon monoxide detection and warning equipment or no CO risk because there's no fuel-burning appliance, fireplace or attached garage; the affidavit isn't a warranty beyond the transfer of title (Conn. Gen. Stat. §29-453(a)). Smoke equipment must be in or near each bedroom and sound when tested (§29-453(b)); CO equipment may run on batteries and must sound when tested (§29-453(e)). The affidavit states, to the seller's knowledge, whether the smoke equipment is battery powered, near each bedroom, powered by the household electrical service and interconnected – a home built before January 1, 1990 may be marked as not subject to the interconnection conditions – and carries a statutory statement that state law requires operable smoke and carbon monoxide equipment (§29-453(c)). The State Fire Marshal's office develops a model affidavit form (§29-453(d)). Exempt are, among others, transfers between co-owners, family transfers without consideration, court-ordered transfers, deeds in lieu, refinances, transfers by executors, administrators, trustees or conservators, and foreclosure acquisitions (§29-453(f)).

The rules

  1. 1. At closing (§29-453(a))

    Seller's signed, dated affidavit to the buyer.

  2. 2. Smoke (§29-453(b))

    In or near each bedroom; sounds when tested.

  3. 3. CO (§29-453(a), (e))

    Equipment present – or no fuel-burning appliance, fireplace or attached garage.

  4. 4. Exemptions (§29-453(f))

    Co-owners, family gifts, court orders, estates and trusts, foreclosures, refinances.

What the TC can do

  • Get the State Fire Marshal's model affidavit form to the seller ahead of closing.
  • Check whether an exemption applies, such as a sale by an executor or trustee.
  • Confirm the signed affidavit is in the closing package.

Questions about the Connecticut smoke and CO affidavit

When does a Connecticut seller give the smoke and CO affidavit?

At the time of closing, signed and dated by the seller (Conn. Gen. Stat. §29-453(a)).

What if a Connecticut home has no fuel-burning appliances?

The affidavit can state the home poses no carbon monoxide risk because it has no fuel-burning appliance, fireplace or attached garage (§29-453(a)(2)).

Does an estate sale in Connecticut need the affidavit?

No – transfers by executors, administrators, trustees or conservators are exempt (§29-453(f)(8)).

On a Connecticut deal, ClosingCode adds a document slot for the seller's smoke and CO affidavit and shows this rule under it – add a deal and see it.

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Source: Connecticut General Statutes §29-453 (cga.ct.gov, read October 26, 2026).

General information, not legal advice. Use the State Fire Marshal's form where available. ClosingCode is software; it is not a law firm. This guide is not a substitute for the advice or services of an attorney.