Groton Zoning & Land Use Guide
What we have on file vs. what to verify locally
We don't have editor-verified zoning prose for Grotonyet. Here's the structured data we do have, and the highest-leverage steps to confirm specifics for your parcel.
What we have on file
- Population:
- 38,411
- 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:
- Town of Groton Office of Planning & Development
- Municipal code:
- View code online
- Zoning map:
- View city zoning map
Verify these locally
- Call the Town of Groton Office of Planning & Development: (860) 446-5970
- Search the municipal code for the chapter that covers your zoning district and proposed use.
- Use the city 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 Groton and frequently restrict ADUs, fences, and exterior changes beyond what zoning allows.
Key Zoning Facts
Groton Zoning Overview
Groton is a town in New London County, Connecticut with a population of approximately 38,411 (2020 Census). The town manages land use through its zoning regulations, administered by the Office of Planning & Development and the Planning, Zoning, and Wetlands commissions.
Note: The City of Groton is a separate borough within the Town of Groton and has its own zoning regulations. This page covers the Town of Groton zoning.
Groton uses lot-size-based residential zones that distinguish between sewered and unsewered areas, along with commercial, mixed-use, and special design districts.
Key Zoning Districts
Residential Districts
- R-7 — Highest-density residential (7,000 sq ft min lot, near Mystic Village)
- R-12 — Residential (12,000 sq ft minimum lot)
- RS-12 — Residential Single-family (12,000 sq ft)
- RS-20 — Residential Single-family (20,000 sq ft)
- RU-20 — Residential Unsewered (20,000 sq ft)
- RU-40 — Residential Unsewered (40,000 sq ft, north of I-95)
- RU-80 — Residential Unsewered (80,000 sq ft, north of I-95)
Commercial and Mixed-Use Districts
- CN — Commercial Neighborhood
- CR — Commercial Regional (auto-oriented, Route 184 corridor)
- MTC — Mixed-Use Town Center
- MVC — Mixed-Use Village Center
- MDD — Mystic Design District
- NMDD — Naval Museum Design District
- WW — Working Waterfront
Industrial Districts
- IA / IB / IC — Industrial districts (legacy designations)
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 Groton are determined locally — contact the Office of Planning & Development at (860) 446-5970 to confirm current local ADU regulations.
Development Process
- Zoning Verification — Check your property's zoning using the GIS interactive map or contact Planning & Development at (860) 446-5970
- Application Submission — Submit required applications to the appropriate 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
- Town vs. City of Groton — Verify which jurisdiction applies to your property; they have different zoning codes
- Groton has unsewered (RU) zones with larger lot requirements in areas north of I-95
- The Mystic Design District (MDD) has special design standards for the historic Mystic area
- The Working Waterfront (WW) zone protects maritime uses along the coast
- Groton is undertaking a comprehensive zoning update
- Verify flood zone status using FEMA's Flood Map Service
Disclaimer: This guide provides general information about zoning in Groton and should not be relied upon as legal advice. Zoning codes are subject to change. Always verify current regulations with the Groton Office of Planning & Development at (860) 446-5970 before making development decisions.
Regulatory Layers That Apply in Groton
Your property is subject to ALL of these regulatory layers. Each one can impose additional requirements beyond the others.
Federal
- FEMA Flood Zones: Applicable
- 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 London County
- Role: County-level geographic reference; Connecticut has no county government.
City / Municipal
The city's zoning ordinance, building codes, and local permits form the primary layer of land-use regulation for your property.
Overlay Districts
No overlay districts identified.
Private Restrictions
- HOA / CC&Rs common: Yes
- Check HOA CC&Rs and deed restrictions for additional requirements.
Statewide Context (Connecticut)
Local data for Groton 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 Groton
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 Town of Groton Office of Planning & Development.
Permit Costs & Timelines
Permit Costs & Timelines
Specific permit fee schedules for Groton are available from the local planning department. Fees vary based on project type, scope, and valuation.
Check Groton permit fees →Official Sources
City-specific