Connecticut building code
Connecticut has adopted 2022 CSBC (2021 IBC portion of the 2022 Connecticut State Building Code) based on 2021 IBC. The table below lists the governing edition for every discipline a plan check touches, followed by the Connecticut cities and counties that amend it locally.
- Current edition
- 2022 Connecticut State Building Code / 2022 CT State Fire Safety & Fire Prevention Codes (2021 I-codes, 2020 NEC, 2021 NFPA 1 & 101), effective 2022-10-01
- Prior edition
- 2018 Connecticut State Building Code, based on the 2015 I-codes and 2017 NEC, applying to permit applications filed 2018-10-01 through 2022-09-30 (per the OSBI regulations page, verified 2026-07-02)
- Code authority
- Connecticut Department of Administrative Services (DAS): Office of the State Building Inspector (OSBI) and Office of the State Fire Marshal (OSFM), jointly with the Codes and Standards Committee
Edition changeover: Projects with a complete application on or before 2022-09-30 may still be reviewed under the 2018 Connecticut State Building Code, based on the 2015 I-codes and 2017 NEC, applying to permit applications filed 2018-10-01 through 2022-09-30 (per the OSBI regulations page, verified 2026-07-02).
Adopted code by discipline
| Discipline | Adopted code | Local amendment |
|---|---|---|
| Building | 2022 CSBC (2021 IBC portion of the 2022 Connecticut State Building Code) based on 2021 IBC | n/a |
| Residential | 2022 CSBC (2021 IRC portion of the 2022 Connecticut State Building Code) based on 2021 IRC | n/a |
| Existing buildings | 2022 CSBC (2021 IEBC portion of the 2022 Connecticut State Building Code) based on 2021 IEBC | n/a |
| Fire | 2022 2022 Connecticut State Fire Safety Code (CSFSC) + 2022 Connecticut State Fire Prevention Code (CSFPC) based on 2021 IFC (CSFSC Part III, new work / post-2006 permits) + 2021 NFPA 101 (CSFSC Part IV, buildings permitted before 2006-01-01); 2021 NFPA 1 (CSFPC) | n/a |
| Electrical | 2022 CSBC (2020 NFPA 70 NEC portion of the 2022 Connecticut State Building Code) based on 2020 NFPA 70 (NEC) | n/a |
| Mechanical | 2022 CSBC (2021 IMC portion of the 2022 Connecticut State Building Code) based on 2021 IMC | n/a |
| Plumbing | 2022 CSBC (2021 IPC portion of the 2022 Connecticut State Building Code) based on 2021 IPC | n/a |
| Energy | 2022 CSBC (2021 IECC portion of the 2022 Connecticut State Building Code) based on 2021 IECC (commercial compliance includes ASHRAE 90.1-2019 path per IECC; DOE lists CT commercial as 2021 IECC & 90.1-2019) | n/a |
| Accessibility | 2022 CSBC (ICC A117.1-2017 portion of the 2022 Connecticut State Building Code, with CT amendments) based on ICC A117.1-2017 | n/a |
| Fuel Gas | 2022 (state code); NFPA 54-2021, NFPA 58-2020, NFPA 2-2020 NFPA 54 / NFPA 58 / NFPA 2 (via 2022 CT State Fire Safety Code and 2022 CT State Fire Prevention Code) based on 2021 NFPA 54, 2020 NFPA 58, 2020 NFPA 2 | n/a |
Overlays that can apply
Mapped hazard and district overlays stack on top of the adopted code. These are the overlays recorded for Connecticut. They apply by parcel, not jurisdiction-wide, so confirm the parcel before assuming one is in play. Check CAL FIRE's fire hazard severity viewer and FEMA's flood map service.
- FEMA mapped flood hazard area
- California Coastal Zone
Sources
- https://portal.ct.gov/en/DAS/Office-of-State-Building-Inspector/Connecticut-State-Building-Code/Regulations
- https://portal.ct.gov/das/-/media/das-beta/pdf/office-of-state-building-inspector/2022-csbc-final.pdf
- https://portal.ct.gov/das/-/media/das/office-of-state-building-inspector/2022-state-codes/2022-csfsc-final.pdf
- https://portal.ct.gov/-/media/DAS/Office-of-State-Building-Inspector/2022-State-Codes/2022-CSFPC-Final.pdf
- https://portal.ct.gov/en/DAS/Office-of-State-Building-Inspector/Building-and-Fire-Code-Adoption-Process
- https://portal.ct.gov/en/DAS/Office-of-State-Fire-Marshal/CT-Fire-Safety-and-Prevention-Codes
- https://www.concrete.org/Portals/0/Files/PDF/Master-I-Code-Adoption-Chart_December_2025.pdf
- https://www.energycodes.gov/state-portal
Common questions
What building code does Connecticut use?
Connecticut uses 2022 CSBC (2021 IBC portion of the 2022 Connecticut State Building Code) based on 2021 IBC. It is administered by the Connecticut Department of Administrative Services (DAS): Office of the State Building Inspector (OSBI) and Office of the State Fire Marshal (OSFM), jointly with the Codes and Standards Committee. The prior edition was 2018 Connecticut State Building Code, based on the 2015 I-codes and 2017 NEC, applying to permit applications filed 2018-10-01 through 2022-09-30 (per the OSBI regulations page, verified 2026-07-02).
Do cities in Connecticut amend the state code?
Local amendments are adopted by ordinance at the city or county level. Confirm with the building department that reviews your permit.
Which edition applies to a permit already in review in Connecticut?
Projects with a complete application on or before 2022-09-30 may still be reviewed under the 2018 Connecticut State Building Code, based on the 2015 I-codes and 2017 NEC, applying to permit applications filed 2018-10-01 through 2022-09-30 (per the OSBI regulations page, verified 2026-07-02).
Check a plan set against Connecticut code
Knowing the adopted edition is the easy half. Architechtura reads your drawings, resolves which of these provisions actually apply to the project, and returns the corrections a plan checker would write up, each one cited to the section it came from.
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Compiled from published state and municipal adoption ordinances. Local governments amend their codes on their own schedule, and a pending ordinance can change what applies to your permit. Confirm the governing edition with the building department before you submit. This page is reference information, not a code determination.