Building Permit FAQ
Answers to the most frequently asked questions about residential building permits in the United States. Can't find your question? Use our free permit quiz to check your city's specific rules.
What is a building permit?
A building permit is an official government approval required before you start construction or renovation on your property. It ensures your project meets local building codes, safety standards, and zoning regulations. Permits are issued by your city or county building department after reviewing your plans.
What is a construction zoning permit?
A zoning permit (also called a land use permit) verifies your project complies with local zoning laws — rules about where buildings can be placed, how tall they can be, and how far they must be from property lines. It is separate from a building permit, which covers structural safety. Many cities require both. Read our full zoning permit guide.
Do I need a permit to build a shed?
In most cities, sheds under 100-200 square feet do not require a building permit. The exact threshold varies by city — Austin allows up to 200 sq ft, while Chicago requires permits over 100 sq ft. Even without a permit, setback rules still apply. View shed permit rules by city.
Do I need a permit to build a deck?
In most cities, yes. Attached decks and decks elevated more than 30 inches above grade almost always require a building permit. Some cities exempt small, ground-level freestanding decks. View deck permit rules.
Do I need a permit to build a fence?
Most cities allow backyard fences under 6 feet without a permit. Front yard fences, fences over 6 feet, and fences on corner lots often require permits. View fence permit rules.
Do I need a permit for a pergola?
It depends on the roof type, size, and whether it's attached to your house. Open-rafter freestanding pergolas are exempt in many cities. Solid-roof and attached pergolas typically need permits. View pergola permit rules.
Do I need a permit for a hot tub?
Portable plug-in hot tubs (120V) usually don't need permits. But most full-size hot tubs require a 220V dedicated circuit, which always needs an electrical permit. In-ground hot tubs need both building and electrical permits. View hot tub permit rules.
How much does a building permit cost?
Costs vary by city and project: sheds $50-$300, decks $100-$500, fences $0-$200, pools $300-$2,000, ADUs $1,000-$5,000+. Many cities charge based on project valuation. Use our cost estimator.
What happens if you build without a permit?
Consequences include fines ($200-$10,000+), stop-work orders, required demolition, retroactive permits at 2-4x cost, home sale complications, and insurance claim denials. Read the full guide.
What are setback requirements?
Setbacks are minimum distances structures must be from property lines — typically 3-5 feet from sides/rear and 15-25 feet from the front. They apply even when no permit is required. View setback rules by city.
What's the difference between HOA rules and city permits?
They are separate requirements — you must comply with both. City permits cover safety and zoning. HOA rules cover aesthetics and community standards. HOA rules are often stricter. Read the full comparison.
How long does it take to get a building permit?
Processing times vary: simple projects like sheds 1-5 business days, decks and pergolas 1-3 weeks, pools 2-6 weeks, ADUs 4-12 weeks. Some cities offer same-day over-the-counter permits for simple projects. View timelines by project type.