Derby Zoning & Land Use Guide
Official references and local checks
Use the official references below to identify the rules that apply to your address, then confirm parcel-specific requirements with the local authority before filing an application.
Official references
- Population:
- 12,325
- State building code:
- 2018 CT State Building Code (based on IBC)(statewide default)
- State ADU law:
- Yes — Connecticut Public Act 21-29 (2021) added CGS section 8-2o, which establishes a statewide default that municipalities must allow at least one accessory apartment as of right on each lot containing a single-family dwelling. Municipalities could opt out through a statutory two-thirds vote of their legislative body and zoning commission. Where the default applies, local regulations must permit ADUs at a maximum net floor area of at least 30 percent of the principal dwelling or 1,000 square feet, whichever is less.
- FEMA flood map:
- Search flood zones
- Planning department:
- City of Derby Planning & Zoning Commission
- Municipal code:
- View code online
- Zoning map:
- View local zoning map
Before you apply
- Call the City of Derby Planning & Zoning Commission: (203) 736-1450
- Search the municipal code for the chapter that covers your zoning district and proposed use.
- Use the local zoning map to look up your parcel's zoning designation before applying for a permit.
- Check FEMA flood zone for your parcel — flood-zone status changes setbacks, foundation requirements, and insurance.
- Check your HOA CC&Rs and recorded deed restrictions — they are common in Derby and frequently restrict ADUs, fences, and exterior changes beyond what zoning allows.
Key Zoning Facts
Derby is a city in New Haven County, Connecticut with a population of approximately 12,325 (2020 Census). The city manages land use through its zoning regulations, available on eCode360 and administered by the Planning & Zoning Commission.
Derby's zoning code includes residential districts (R-1 through R-6, R-M), business districts (B-1, B-2), industrial zones (I-1, I-C), and several special districts for downtown redevelopment and institutional uses.
Key Zoning Districts
Residential Districts
- R-1 — Large lot residential (private sewage capable)
- R-2 — Residential
- R-3 — Urban residential (single/two-family)
- R-4 / R-5 / R-6 — Higher-density residential
- R-M — Residential Multiple (multi-family)
- CR — Center Residence
Business Districts
- B-1 — Business
- B-2 — Business
- CDD — Center Design Development (downtown redevelopment)
Industrial and Special Districts
- I-1 — Industrial (moderate intensity, non-nuisance)
- I-C — Industrial Campus
- MDD — Mill Design District
- HC — Hospital/Campus
- OS — Open Space
- P — Public and Semi-Public
Accessory Dwelling Units (ADUs)
Connecticut PA 21-29 (2021) set a statewide default allowing accessory dwelling units (ADUs) as-of-right, but municipalities could opt out by a 2/3 vote of their legislative body before January 1, 2023. ADU rules in Derby are determined locally — contact the Planning & Zoning Commission at (203) 736-1450 to confirm current local ADU regulations.
Development Process
- Zoning Verification — Review the zoning map or contact City Hall at (203) 736-1450
- Application Submission — Submit required applications to the Planning & Zoning Commission
- Public Hearing — Required for special permits, variances, and zone changes
- Building Permit — Obtain from the Building Department
- Inspections — Schedule required inspections during construction
Key Considerations
- The Center Design Development (CDD) and Mill Design District (MDD) zones support downtown and historic mill redevelopment
- Derby has a Hospital/Campus (HC) zone for institutional uses
- Review the zoning regulations on eCode360 for specific dimensional standards
- Verify flood zone status using FEMA's Flood Map Service
Disclaimer: This guide provides general information about zoning in Derby and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations with the Derby Planning & Zoning Commission at (203) 736-1450 before making development decisions.
Regulatory Layers That Apply in Derby
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA flood mapping: check parcel-specific flood-zone status
- View FEMA Flood Map
State — Connecticut
- Building Code: 2022 Connecticut State Building Code (based on 2021 IBC as amended)
- State ADU Override: Yes (CGS Sec. 8-2o (Connecticut Public Act 21-29, 2021) — statewide default requires municipalities to allow at least one accessory apartment as of right; opt-out by two-thirds vote of legislative body and zoning commission.)
County — New Haven County
- Role: County-level geographic reference; Connecticut has no county government.
City / Municipal
The municipality's zoning ordinance, building-code enforcement, and local permits form the primary local layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- Private covenants, deed restrictions, condominium rules, or association rules can impose requirements beyond zoning.
- Check HOA CC&Rs and deed restrictions for additional requirements.
Statewide Context (Connecticut)
Local data for Derby is limited. The following state-level facts apply across Connecticut and are inherited by this page until city-specific details are verified.
- State Building Code
- 2018 CT State Building Code (based on IBC)
- State ADU Preemption
- Yes — state law overrides local rules
- Coastal Zone
- Yes
- Wildfire Zones
- No
ADU Rules in Derby
State law (statewide context, not city-specific):
Connecticut Public Act 21-29 (2021) added CGS section 8-2o, which establishes a statewide default that municipalities must allow at least one accessory apartment as of right on each lot containing a single-family dwelling. Municipalities could opt out through a statutory two-thirds vote of their legislative body and zoning commission. Where the default applies, local regulations must permit ADUs at a maximum net floor area of at least 30 percent of the principal dwelling or 1,000 square feet, whichever is less.
For local size, setback, and parking specifics, contact the City of Derby Planning & Zoning Commission.
Permit Costs & Timelines
Check Current Permit Fees & Timelines
Permit fees and review times can vary by project type, scope, valuation, and required approvals. Check the current schedule with the local permitting authority before filing.
Check current Derby permit information →Official Sources
City-specific