Why Illuminated Signs Require Two Permits
A sign permit confirms your sign meets the location's zoning rules: the right size, type, and placement for your district. An electrical permit covers the safety of the electrical installation: the wiring, the power connection, and the load. These are separate reviews handled by separate departments and inspectors. You cannot energize (turn on) an illuminated sign until both permits are approved and the electrical inspection has passed.
In practice, most sign companies file both permits simultaneously and schedule their work so the electrical inspection happens before the sign is fully commissioned. The sign installer handles the sign permit; a licensed electrician handles the electrical permit.
What Counts as "Illuminated"
Nearly every definition of an illuminated sign in U.S. municipal codes includes:
- Internally illuminated signs — light source inside the sign cabinet, including standard cabinet signs, backlit panels, and illuminated channel letters
- Neon signs — including exposed neon tubes and neon-flex LED strips designed to replicate neon
- LED and digital displays — electronic message centers and full-color digital billboards
- Externally illuminated signs — signs lit by dedicated floodlights or spotlights mounted separately from the sign
- Halo or reverse-lit signs — channel letters mounted away from the wall so light projects behind the letters
- Backlit awning signs — awning fabric with internal lighting
Signs that are NOT considered illuminated (and don't trigger the electrical permit requirement):
- Non-illuminated signs that happen to be in a well-lit area
- Signs lit only by general area or parking lot lighting not dedicated to the sign
- Reflective signs (retro-reflective materials with no power source)
The Sign Permit Process for Illuminated Signs
The sign permit application for an illuminated sign follows the same process as any other sign permit, with additional documentation requirements:
- ✓ Completed sign permit application
- ✓ Sign drawings with exact dimensions, letter height, and depth (for channel letters)
- ✓ Specification for the light source (LED type, color temperature, brightness in nits or foot-candles)
- ✓ Site plan showing sign location
- ✓ Building photo
- ✓ Landlord authorization (if tenant)
- ✓ Sign permit fee
For digital / LED display signs, many cities require additional documentation: hours of operation (some ordinances limit illuminated signs to specific hours), maximum brightness (often capped at 0.3 foot-candles above ambient in residential adjacent areas), and message dwell time (minimum seconds each message displays).
The Electrical Permit Process
The electrical permit is separate from the sign permit and goes through your city's or county's electrical division. Key points:
- Who applies: The licensed electrical contractor performing the installation. In most states, only a licensed electrician can pull an electrical permit — the business owner cannot apply directly for electrical work.
- What's reviewed: The electrical drawings, load calculations, wire gauge, breaker sizing, and connection to the electrical panel.
- What's required: A wiring diagram showing how the sign connects to the building's electrical system, the sign manufacturer's UL listing documentation, and the electrical contractor's license number.
- Inspection: After installation and before the sign is turned on, an electrical inspector must visit and approve the wiring. Only after the inspector signs off can the sign be energized.
Special Rules for Digital / LED Signs
Digital and electronic message center (EMC) signs face the most restrictive rules of any sign type. Common restrictions include:
- Brightness limits — most codes cap brightness at levels that prevent light pollution and driver distraction. Typical limit: 0.3 foot-candles above ambient illuminance at a specified distance.
- Message dwell time — messages must display for a minimum period (often 4–8 seconds) before changing. Animation, scrolling, and flashing are prohibited in most sign codes.
- Hours of operation — many codes require automatic dimming after 11 p.m. or require signs to be turned off entirely during late night hours in residential-adjacent locations.
- Zone restrictions — digital signs are banned outright in many residential, historic, and neighborhood commercial zones.
- Distance from residences — some ordinances require a minimum setback from residential properties regardless of zone.
Timeline for Illuminated Sign Permits
| Sign Type | Sign Permit Review | Electrical Permit Review | Total Estimated Time |
|---|---|---|---|
| Illuminated wall sign (channel letters) | 1–3 weeks | 3–7 business days | 2–4 weeks |
| Internally lit cabinet sign | 1–2 weeks | 3–7 business days | 2–3 weeks |
| Neon sign | 1–2 weeks | 3–7 business days | 2–3 weeks |
| Externally lit sign (spotlight) | 1–3 weeks | 3–10 business days | 2–4 weeks |
| Digital / LED message center | 3–8 weeks | 1–2 weeks | 4–10 weeks |
| Any sign in historic district | Add 3–6 weeks for design review | Same | 6–12 weeks total |
Grandfathered Illuminated Signs
Many older illuminated signs were installed legally under previous sign ordinances that have since been updated. A sign that was legally permitted under old rules may be "grandfathered" — allowed to remain but not expanded or replaced in-kind without meeting current code. Key points about grandfathered signs:
- Grandfathered status typically applies to the sign's location and type, not the specific sign unit. If the sign is destroyed (by fire, wind, or vandalism), a replacement must meet current code.
- Routine maintenance and face changes generally don't affect grandfathered status. Structural modifications or changes to illumination type typically do.
- Some cities have "amortization" provisions that require non-conforming signs to be brought into compliance by a specific date. These are relatively rare but worth checking if your sign is very old.
Illuminated Sign FAQs
Small LED "Open" signs occupy a grey area. Some cities explicitly exempt them if they're under a specific size (often 288 square inches or 2 sq ft) and are plug-in rather than hardwired. Others require a permit for all illuminated window signs. The safest approach: call your planning department and specifically ask about small LED open signs. The call takes two minutes and prevents a violation notice.
External lighting added to an existing non-illuminated sign typically requires both a modification to your sign permit (or a new sign permit treating the illuminated sign as a new sign type) and an electrical permit for the fixture installation. Retrofitting an existing sign with illumination is a modification that triggers the full illuminated sign permit process in most jurisdictions.
If the sign is visible from outside and from a public right-of-way, most sign codes treat it as a window sign subject to their rules — which typically require a permit if illuminated. The physical location of the sign (inside vs. outside the glass) matters less than whether it functions as a sign visible to the public. Confirm your city's specific definition of "window sign."
Planning an illuminated sign?
Download our sign permit application checklist — includes the specific items needed for illuminated signs and electrical permits.
Download Checklist → Estimate Your Fees →Disclaimer: Illuminated sign permit requirements vary by city, county, and zoning district. This page is for general informational purposes only. Always verify current permit requirements with your local planning department and ensure your electrical contractor confirms permit requirements before beginning installation.