Connecticut building permits

Where to get a building permit in Connecticut

Apply to the building department of the city, town or county where the property is (the steps).

Connecticut state agencies

These offices set statewide codes or license the trades. They do not issue permits for most home projects.

Building code in Connecticut

For homes, the residential code is the 2021 International Residential Code portion of the 2022 Connecticut State Building Code², in effect since October 1, 2022⁷ (statewide; applies everywhere¹⁰).

Every code family, edition and effective date is on Connecticut building codes.

State rules on which work needs a permit

Conn. Gen. Stat. § 29-263(a); 2022 Connecticut State Building Code §§ R105.1, R105.2, 105.2; P.A. 25-152, § 8

• Permit required unless excepted. Except as provided in subsection (h) of section 29-252a and the State Building Code adopted pursuant to subsection (a) of section 29-252, after October 1, 1970, no building or structure shall be constructed or altered until an application has been filed with the building official and a permit issued.¹⁰
• Owner or agent applies before work. Any owner or owner’s authorized agent who intends to construct, enlarge, alter, repair, move, demolish or change the occupancy of a building or structure, or to move a lot line that will affect any existing building or structure, or to erect, install, enlarge, alter, repair, remove, convert or replace any electrical, gas, mechanical or plumbing system, the installation of which is regulated by this code, or to cause any such work to be performed, shall first make application to the building official and obtain the required permit.²
• Exemption does not excuse other law. Exemption from the permit requirements of this code shall not be deemed to grant authorization for any work to be done in any manner in violation of the provisions of this code or any other laws, statutes, regulations or ordinances of the jurisdiction.²
• 200 square feet. Other than storm shelters, one-story detached accessory structures used as tool and storage sheds, playhouses and similar uses, provided the floor area is not greater than 200 square feet (18.58 m2).²
• 7 feet. Fences, other than swimming pool barriers, not over 7 feet (2134 mm) high.²
• 3 feet. Retaining walls that are not higher than 3 feet (914 mm) measured from finished grade at the bottom of the wall to finished grade at the top of the wall, unless supporting a surcharge.²
• 30 inches. Sidewalks, driveways and on-grade concrete or masonry patios not more than 30 inches (762 mm) above adjacent grade and not over any basement or story below.²
• Finish work exempt if no structural changes or alterations. Painting, papering, tiling, carpeting, cabinets, countertops and similar finish work not involving structural changes or alterations.²
• 24 inches. Prefabricated swimming pools that are equal to or less than 24 inches (610 mm) deep.²
• 200 square feet. Decks and ramps not exceeding 200 square feet (18.58 m2) in area, that are not more than 30 inches (762 mm) above grade at any point, are not attached to a dwelling, do not require guards, and do not serve the exit door required by Section R311.4.²
• 25%. Repairs that are limited to 25 percent of roof covering and building siding within one calendar year.²
• Minor electrical repair work exempt (lamps, fuses, connecting portable equipment). Minor repair work, including the replacement of lamps and fuses or the connection of approved portable electrical equipment to approved permanently installed receptacles.²
• Leak and stoppage repairs exempt only if no valve, pipe or fixture is replaced or rearranged. The clearing of stoppages or the repairing of leaks in pipes, valves or fixtures, and the removal and reinstallation of water closets, provided such repairs do not involve or require the replacement or rearrangement of valves, pipes or fixtures.²
• Zoning sign-off required before building permit. Pursuant to subsection (f) of section 8-3 of the Connecticut General Statutes, no building permit shall be issued, in whole or in part, for a building, use or structure subject to the zoning regulations of a municipality without certification in writing by the official charged with the enforcement of such regulations that such building, use or structure is in conformity with such regulations or is a valid nonconforming use under such regulations.²
• “pool alarm” means a device which emits a sound of at least fifty decibels when a person or an object weighing fifteen pounds or more enters the water in a swimming pool.¹⁰
• Pool alarm condition on permit. No building permit shall be issued for the construction or substantial alteration of a swimming pool at a residence occupied by, or being built for, one or more families unless a pool alarm is installed with the swimming pool.¹⁰
• 180 days. Every permit issued shall become invalid unless the work authorized by such permit is commenced within 180 days after its issuance or after commencement of work if more than 180 days pass between inspections.²
• 9 years. Nine years from the date of issuance of a building permit issued pursuant to section 29-263 for construction or alteration of a one-family dwelling, two-family dwelling or structure located on the same parcel as a one-family dwelling or two-family dwelling, for which construction or alteration a certificate of occupancy, as defined in the regulations adopted pursuant to section 29-252, has not been issued by the building official, such building permit shall be deemed closed.¹⁰
• Fine $200-$1,000 and/or up to 6 months. Any person who violates any provision of the State Building Code shall be fined not less than two hundred dollars or more than one thousand dollars or imprisoned not more than six months, or both.¹⁰
• Agricultural hoop houses and high tunnels exempt. Notwithstanding any provision of the State Building Code, the agricultural use of structures commonly referred to as "hoop houses" or "high tunnels" shall not be subject to any permitting or construction standards.¹¹

Can local rules be stricter?

Building code exemptions: state process only; zoning and other local law still apply²

Homeowners doing their own work

Conn. Gen. Stat. § 20-340(11); Conn. Gen. Stat. §§ 29-263(a), 20-419(5)(B)(vi)

• No permit shall be issued except upon application of the owner of the premises affected or the owner's authorized agent.¹⁰
• …persons engaged in the installation, maintenance, repair and service of glass or electrical, plumbing, fire protection sprinkler systems, solar, heating, piping, cooling and sheet metal equipment in and about single-family residences owned and occupied or to be occupied by such persons; provided any such installation, maintenance and repair shall be subject to inspection and approval by the building official of the municipality in which such residence is located and shall conform to the requirements of the State Building Code…¹²
• …any work performed without compensation by the owner on such owner's own private residence or residential rental property.¹³

Contractor licensing

Conn. Gen. Stat. §§ 20-419 to 20-421, 20-334, 20-338a, 20-338c, 20-337, 20-341, 29-263(a); ch. 399a

• Home improvement contractor registration. No person shall hold such person out to be a contractor or salesperson without first obtaining a certificate of registration from the commissioner as provided in this chapter…¹³
• Permit requires registration details. No permit shall be issued to a contractor who is required to be registered pursuant to chapter 400, for work to be performed by such contractor, unless the name, business address and Department of Consumer Protection registration number of such contractor is clearly marked on the application for the permit, and the contractor has presented such contractor's certificate of registration as a home improvement contractor.¹⁰
• $120. Each application for a certificate of registration as a home improvement contractor shall be accompanied by a fee of one hundred twenty dollars, except that no such application fee shall be required in any year during which such person has paid the registration fee required under section 20-417b or in any year in which such person's registration as a new home construction contractor is valid.¹⁴
• $20,000. …proof that the applicant has obtained general liability insurance coverage in an amount not less than twenty thousand dollars, demonstrated by providing the policy number and business name of the insurance provider…¹⁴
• New home construction contractor registration. No person shall engage in the business of new home construction or hold such person out as a new home construction contractor unless such person has been issued a certificate of registration by the commissioner in accordance with the provisions of sections 20-417a to 20-417k, inclusive.¹⁵
• Trade license required. No person shall engage in, practice or offer to perform the work of any occupation subject to this chapter in this state, including offering to perform such work in any print, electronic, television or radio advertising or listing, unless such person has first obtained a license as provided in section 20-333, or possesses a card of registration from the Labor Department or the board and is subject to all of the regulations adopted under this chapter for the purpose of governing apprenticeship training, or has been issued a license for such particular work under this chapter prior to July 6, 1967.¹⁶
• Licensed work on permitted jobs. Any contractor who applies for a building permit from a local building official for any work required to be performed by a person licensed under the provisions of this chapter, shall cause such work to be performed by a person licensed under the provisions of this chapter.¹⁶
• Permit before licensed work starts. No person licensed pursuant to sections 20-330 to 20-341, inclusive, shall commence work within the scope of sections 20-330 to 20-341, inclusive, unless each applicable permit with respect to the specific work being performed by such licensee has been obtained as required pursuant to local ordinances and the general statutes.¹⁶
• Contractor of record. …responsible for acting on behalf of the business in obtaining any building permit required by such business.¹³
• Class B misdemeanor for willful unlicensed trade work. Any person who wilfully engages in or practices the work or occupation for which a license is required by this chapter or chapter 399b without having first obtained an apprentice permit or a certificate and license for such work, as applicable [...] shall be guilty of a class B misdemeanor…¹²
• No home improvement work without certificate. …offer to make or make any home improvement without having a current certificate of registration under this chapter…¹⁷
• Class B misdemeanor under § 20-427(b). …any person who violates any provision of subsection (b) of this section, except subdivision (8), shall be guilty of a class B misdemeanor…¹⁷
• Https://portal.ct.gov/dcp/verify-a-license. The Connecticut eLicense portal is a comprehensive, real-time system for managing and verifying more than 800 types of licenses regulated by state agencies.⁵
• [email protected]. Feel free to email the Department of Consumer Protection at [email protected] with any questions about education and licensing for the building trades.⁶

Handyman limits

Conn. Gen. Stat. § 20-419(4)(B), (5)(A), as amended by P.A. 26-100, § 34 · in effect October 1, 2026¹³

• $1,000. (B) "Contractor" does not include a person for whom the total price of all of such person's home improvement contracts with all of such person's customers does not exceed one thousand dollars during any period of twelve consecutive months.¹³
• $200. …in which the total price for all work agreed upon between the contractor and owner or proposed or offered by the contractor exceeds two hundred dollars.¹³

Deadlines for permit decisions and inspections

Conn. Gen. Stat. § 29-263(a)

• 30 days. Such permit shall be issued or refused, in whole or in part, within thirty days after the date of an application.¹⁰
• 30 days. Pursuant to section 29-263 of the Connecticut General Statutes, the building official shall examine or cause to be examined applications for permits and amendments thereto within 30 days after filing and either issue or deny a permit within such 30-day period.²

Private plan review and inspections

• Building official administers code. Such officer shall be known as the building official.¹
• Special inspections are additional, IBC-scope. These special inspections and tests are in addition to the inspections by the building official that are identified in Section 110.²
• Third-party green-building verification. Such requirements shall include a method for demonstrating compliance at the time of application for a certificate of occupancy, including, but not limited to, private third-party certification or verification of compliance with the relevant portions of such rating systems, including, but not limited to, the energy and environmental portions.¹⁰

Selling a home with unpermitted work

Conn. Gen. Stat. §§ 20-327b to 20-327e

• Residential condition report required. …each person who offers residential property in the state for sale, exchange or for lease with option to buy, shall provide a written residential condition report or reports to the prospective purchaser at any time prior to the prospective purchaser's execution of any binder, contract to purchase, option or lease containing a purchase option.¹⁸
• 1-4 units. The provisions of this section shall apply only to transfers by sale, exchange or lease with option to buy, of residential real property consisting of not less than one nor more than four dwelling units which shall include cooperatives and condominiums, and shall apply to all transfers, with or without the assistance of a licensed real estate broker or salesperson, as defined in section 20-311.¹⁸
• Buyer notice on permits and certificates of occupancy. Prospective buyers should consult with the municipal building official in the municipality in which the property is located to confirm that building permits and certificates of occupancy have been issued for work on the property.¹⁸
• Must disclose known problems. Pursuant to the Uniform Property Condition Disclosure Act, the seller is obligated to answer the following questions and to disclose herein any knowledge of any problem regarding the following…¹⁸
• $500. …every agreement to purchase residential real estate, for which a written residential condition report is, or written residential condition reports are, required pursuant to section 20-327b, shall include a requirement that the seller credit the purchaser with the sum of five hundred dollars at closing should the seller fail to furnish the written residential condition report or reports as required by sections 20-327b to 20-327e, inclusive.¹⁹
• Civil action for undisclosed defects. A purchaser may, without limiting any other remedies available to the purchaser, bring a civil action in the judicial district in which the residential real estate is located to recover actual damages from a seller who fails to disclose to such purchaser any defect described in subsection (b) of this section.¹⁹
• Actual knowledge only. The representations made by the seller pursuant to section 20-327b or 20-327c shall be construed only to extend to the seller's actual knowledge of the property and no constructive knowledge shall be imputed to the seller.¹⁹

Accessory dwelling units (ADUs)

Conn. Gen. Stat. § 8-2o, as amended by P.A. 26-7, § 2 · in effect October 1, 2026²⁰

• …provided at least one accessory [apartment] dwelling unit shall be allowed as of right on each lot that contains a single-family dwelling and no such accessory [apartment] dwelling unit shall be required to be an affordable accessory [apartment] dwelling unit…²⁰
• Attached, internal or detached. Allow accessory [apartments] dwelling units to be attached to or located within the proposed or existing principal dwelling, or detached from the proposed or existing principal dwelling and located on the same lot as such dwelling…²⁰
• At least 30% of principal dwelling or 1,000 sq ft, whichever is less. Set a maximum net floor area for an accessory [apartment] dwelling unit of not less than thirty per cent of the net floor area of the principal dwelling, or one thousand square feet, whichever is less, except that such regulations may allow a larger net floor area for such [apartments] accessory dwelling units…²⁰
• 65 days. …that a decision on any such application be rendered not later than sixtyfive days after receipt of such application by the applicable zoning commission, except that an applicant may consent to one or more extensions of not more than an additional sixty-five days or may withdraw such application.²⁰
• Sprinklers only if required for principal dwelling or by fire code. …require the installation of fire sprinklers in an accessory [apartment] dwelling unit if such sprinklers are not required for the principal dwelling located on the same lot or otherwise required [...] by the fire code.²⁰
• No required correction of nonconformities. A municipality shall not (1) condition the approval of an accessory [apartment] dwelling unit on the correction of a nonconforming use, structure or lot…²⁰
• …any more than one parking space for any such accessory [apartment] dwelling unit…²⁰
• No required separate utility connection. [A] No municipality, special district, sewer or water authority or water company, as defined in section 16-1, shall [not] (1) consider an accessory [apartment] dwelling unit to be a new residential use for the purposes of calculating connection fees or capacity charges for utilities, including water and sewer service, unless such accessory [apartment] dwelling unit was constructed with a new single-family dwelling on the same lot, or (2) require the installation of a new or separate utility connection directly to an accessory [apartment] dwelling unit or impose a related connection fee or capacity charge.²⁰
• Building code still applies. Be interpreted and enforced such that nothing in this section shall be in derogation of (A) applicable building code requirements…²⁰
• Opt-out closed after Jan. 1, 2023. …except that, on and after January 1, 2023, no municipality may opt out of the provisions of said subsections.²⁰
• TOD override of opt-out. …any owner of real property located within a transit-oriented district, as defined in section 8-13hh, who has owned such real property located within a transit-oriented district in the municipality for not fewer than three years, may construct an accessory [apartment] dwelling unit on such real property as of right…²⁰
• "Accessory dwelling unit" defined. (1) ["Accessory apartment"] "Accessory dwelling unit" means a separate dwelling unit that (A) is located on the same lot as a principal dwelling unit of greater square footage, (B) has cooking facilities, and (C) complies with or is otherwise exempt from any applicable building code, fire code and health and safety regulations…²⁰
• Signed May 7, 2026. 05-07-2026 SIGNED BY THE GOVERNOR…²¹
• Broader bill not shown as enacted. 04-15-2026 TABLED FOR THE CALENDAR, HOUSE…²²

Applies to

Zoning regulations under § 8-2 or any special act²⁰

Can local rules be stricter?

No²⁰