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Sign Permit in Idaho: Cost, Steps & How to File

Every Idaho business owner eventually needs to answer the sign permit question: what does it cost, how long does it take, and where do I actually file? This page answers all three with the current Idaho numbers, plus the government link to start the application.

Typical cost

$50–$800

Timeline

7–45 days

Renewal

No renewal — one-time permit per sign, until you change the sign

Who needs it

commercial businesses installing exterior signage

Steps to get a sign permit in Idaho

Step 1: Measure the sign face area, height, and setback from property line
Step 2: Check the city's sign code — every city has size, height, illumination, and landmark district limits
Step 3: Get landlord written approval if you're a tenant
Step 4: Apply through the city's planning or building department with a scale drawing showing dimensions, materials, and mounting method
Step 5: Pay the sign permit fee (often based on sign area)
Step 6: Schedule the sign inspection after installation — the sign isn't legal until it passes

Required documents

Sign drawing to scale
Site plan showing sign location
Landlord approval letter
Contractor info (if hiring an installer)

Where to file in Idaho

Business filings: https://sosbiz.idaho.gov
Secretary of State: https://sos.idaho.gov
Tax authority: https://tax.idaho.gov
Labor/workforce: https://labor.idaho.gov

Heads up: A common Idaho mistake: assuming this sign permit covers your city and county requirements too. It usually doesn't. Check your city's business division separately — most cities in Idaho require their own general business license on top of state filings.

Related permits in Idaho

Business License in Idaho

Frequently asked questions

How much does a sign permit cost in Idaho?

Typical cost ranges from $50–$800. The exact fee depends on your specific business type, city, and any expedited processing you choose.

How long does it take to get a sign permit in Idaho?

Most Idaho applications complete in 7–45 days. Same-day or next-day processing is often available for an added fee at the state level.

Do I need a sign permit if I'm just starting a home business in Idaho?

In most cases, yes — even home-based businesses in Idaho are subject to the same state filing rules. Local rules (city and county) may add a home occupation permit on top.

This page reflects general Idaho filing rules as of 2026. Fees and processing times change; verify the current amounts with the linked state agency before filing.