Connecticut Sign Permit Guide: New London, Groton, Stonington & Westerly
Step-by-step sign permit requirements for southeastern Connecticut and Westerly RI. Size limits, illumination rules, historic districts, and how long approvals actually take.
Sign permits in southeastern Connecticut are not hard.
They're just inconsistent — every town has its own zoning code, its own square-foot limits, its own rules about illumination, and a handful have historic district overlays on top.
This is the field guide we wish someone had handed us. Skip to your town below.
New London, CT
Permit required: Yes, for any new exterior sign, replacement sign, or sign over 4 sq ft.
Where to file: New London Building Department, 181 State Street.
Cost: Approximately $50 base + per-square-foot fee.
Wall sign size limit: Generally 1.5 sq ft per linear foot of building frontage in commercial zones (CBD differs).
Freestanding sign limit: 40 sq ft, max 12 ft height in most commercial districts.
Watch out for: The downtown Bank Street historic district has additional design review. Internally-illuminated cabinet signs are often denied; halo-lit dimensional letters are encouraged.
Typical approval time: 2–4 weeks for standard signs, 6–8 weeks if historic review is triggered.
Groton, CT (Town and City of Groton)
Two separate jurisdictions to know — the Town of Groton (most commercial areas including Route 1) and the City of Groton (the dense urban core near the river).
Town of Groton permit: Required for all signs over 6 sq ft. Filed at the Office of Planning and Development Services on Fort Hill Road.
City of Groton permit: Required for all signs, including window graphics over 25% coverage.
Wall sign size limit: 10% of building face in most commercial zones, capped at 100 sq ft.
Watch out for: The Naval Submarine Base corridor has setback requirements that are stricter than typical zoning would suggest.
Internally-illuminated signs are permitted in most commercial zones, but residential-adjacent properties face additional brightness limits.
Typical approval time: 3–5 weeks.
Stonington, CT (including Pawcatuck and Mystic)
Permit required: Yes, for any exterior sign. Even temporary banners over 30 days require a permit.
Where to file: Stonington Land Use Office, 152 Elm Street.
Wall sign size limit: 1 sq ft per linear foot of frontage, capped at 32 sq ft in the Village District.
Watch out for: Stonington Borough and Mystic both have strict design review. Plastic-faced cabinet signs are routinely denied. Carved, dimensional, and gold-leaf signs sail through.
Illuminated signs in historic districts must be externally lit (gooseneck-style) rather than internally illuminated.
Typical approval time: 4–8 weeks. Borough projects can stretch to 10+ weeks if the design needs revision.
Westerly, RI
Different state, different rules — but only marginally.
Permit required: Yes, for all permanent exterior signs and window signs over 4 sq ft.
Where to file: Westerly Building Official, 45 Broad Street.
Cost: $35 base permit + per-square-foot fee.
Wall sign size limit: 1.5 sq ft per linear foot of frontage, capped at 50 sq ft in the General Business district.
Watch out for: Downtown Westerly and Watch Hill both have additional design overlays. The Watch Hill design guidelines specifically favor wooden, dimensional, externally-illuminated signs and discourage backlit acrylic.
Typical approval time: 2–4 weeks downtown, 4–6 weeks Watch Hill.
The five most common permit denials we see
- Too bright. Internally illuminated signs in historic districts get denied 90% of the time.
- Square footage exceeded. Owners measure the sign face; zoning measures the bounding box including any architectural surround.
- Setback violation. Freestanding signs need to sit a minimum distance off the property line.
- Wrong materials. Mystic and Watch Hill specifically call out unacceptable materials in their design guidelines.
- Missing engineered drawings. Anything over 32 sq ft typically requires stamped structural drawings.
How WaterMark handles permits
We handle the entire permit process for every client — included in the project price, never billed separately.
That means:
- Pre-design zoning review (no wasted design work)
- Scaled architectural drawings ready for submittal
- Filing the application and tracking the review
- Responding to revision requests from zoning officials
- Coordinating with historic district commissions when required
Talk to someone who's done this 200+ times
We've pulled permits in every town listed above this year alone. If you're staring at a zoning code trying to figure out what you're allowed to do, save yourself the headache.
Call (860) 334-7412 with your address. We'll tell you in 5 minutes what's possible at your location.
Service-specific pages: New London signs, Groton signs, Westerly signs.