Bridgeport allows accessory dwelling units (ADUs) in single-family residential zones (AAA, AA, R-3, R-2, A, B, C) as a permitted accessory use under the City of Bridgeport Zoning Regulations. The city did not affirmatively opt out of Connecticut Public Act 21-29 (codified at CGS Section 8-1c), so the state's as-of-right ADU framework applies as a baseline floor. Construction is reviewed under the Connecticut State Building Code (CT Supplement 2022 adopting the 2021 IBC/IRC) by the Bridgeport Building Department.
An ADU project in Bridgeport intersects three regulatory layers. First, the City of Bridgeport Zoning Regulations (most recently amended July 25, 2022) permit attached or internal ADUs in zones AAA, AA, R-3, R-2, A, B, and C, with detached ADUs allowed on lots of at least two acres. Local rules cap unit size at the lesser of 40 percent of the principal dwelling's floor area or 1,500 square feet, require one off-street parking space, and call for owner-occupancy of either the main dwelling or the ADU. Second, Connecticut Public Act 21-29 (2021), codified at CGS Section 8-1c, requires every municipality to permit ADUs as-of-right in single-family zones (maximum 1,000 sq ft or 30 percent of the principal dwelling) UNLESS the local zoning commission and the highest legislative body each opted out by a two-thirds vote before January 1, 2023. The Bridgeport Planning and Zoning Commission did NOT adopt an opt-out resolution, so the state's as-of-right framework operates as a backstop where local rules are more restrictive. Third, the Connecticut State Building Code (CT Supplement 2022, adopting 2021 IBC/IRC) governs construction; the Bridgeport Building Department (Margaret E. Morton Government Center) issues building, electrical, plumbing, and mechanical permits. The Bridgeport Zoning Department reviews the zoning compliance application through the Park City Portal, requiring a site plan, scope of work, and construction drawings. CT State Fire Safety Code under CGS Section 29-291 (Regulations 29-292 adopting the IFC) requires smoke and carbon monoxide alarms in each unit.
Building an ADU without zoning approval or building permits triggers a stop-work order from the Bridgeport Building Official and a notice of zoning violation from the Zoning Enforcement Officer under CGS Section 8-12. Penalties include daily civil fines, double permit fees on after-the-fact applications, exposure of concealed framing and mechanical work for inspection, and possible injunctive relief in Connecticut Superior Court. Unpermitted units cannot be lawfully rented and may be cited under the Bridgeport Housing Code (Chapter 15.12). State fire-safety violations are enforceable by the Bridgeport Fire Marshal under CGS Section 29-298.
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See how Bridgeport's adu permits rules stack up against other locations.
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