Do You Need a Permit to Build a Shed?

Common size exemptions, what always triggers a permit, and what happens if you build without one.

Last updated: July 2026

Quick Answer: Most U.S. jurisdictions let you build a shed of 100–200 square feet without a permit, and 120 sq ft is the single most common threshold. But any shed with electrical wiring, plumbing, or a permanent foundation usually needs a permit regardless of size — and even permit-exempt sheds must follow setback rules.

One thing before we get into the numbers: permit rules are set by local jurisdictions — your city, county, or township — and they vary widely from one to the next. The figures on this page are the most common thresholds used across the U.S., not a guarantee for your address. Always confirm the rules with your local city or county building department before you buy materials or break ground.

Common Size Thresholds

The single biggest factor in whether your shed needs a permit is its footprint. Most jurisdictions exempt small "accessory structures" from permitting, and the exemption line typically falls between 100 and 200 square feet:

≤120 sq ft: Exempt in the majority of U.S. jurisdictions — this comes straight from the International Residential Code's model exemption, which many localities adopt. A 10×12 shed sits exactly at this line.
≤200 sq ft: Some areas (including many that follow newer IRC editions) allow up to 200 sq ft without a permit — enough for a 12×16.
Height limits: Exemptions usually also cap height, commonly around 10–15 feet at the peak. A tall gambrel-roof shed can lose its exemption even with a small footprint.
Setbacks: Even a permit-exempt shed must typically sit 5–10 feet from property lines and clear of easements. Setback violations are the most common way "no permit needed" sheds still get flagged.

Fun fact for planners: America's most popular shed size, the 10×12, is 120 sq ft — exactly at the most common exemption line. That's not a coincidence; builders and kit manufacturers size to the threshold. If your area exempts "under 120 sq ft" rather than "120 sq ft and under," a 10×12 might tip you over — one more reason to ask your building department for the exact wording.

What Always Triggers a Permit

Size exemptions cover a basic storage box. Add utilities or permanence and the calculus changes almost everywhere:

Electrical: Running power to a shed requires an electrical permit in virtually every jurisdiction, no matter how small the shed. This is the most commonly skipped — and most commonly caught — permit.
Plumbing: Any water supply or drain line triggers a plumbing permit, and often reclassifies the structure entirely.
Concrete slab foundations: Some areas treat a poured slab as a "permanent foundation" that voids the accessory-structure exemption, even for a small shed. Gravel pads and deck blocks rarely have this problem.
Attaching to the house: The moment a structure connects to your home, it's an addition, not an accessory building — full permit and code review apply.

What Happens If You Skip It

Plenty of sheds get built without required permits, and enforcement varies. But when it goes wrong, it goes wrong in expensive ways:

Stop-work orders and fines: A neighbor complaint or a passing inspector can halt your build mid-project. Fines vary widely but often exceed what the permit would have cost many times over.
Forced removal: If the shed violates setbacks or can't be brought to code, the jurisdiction can require you to move or demolish it at your expense.
Insurance denial: If an unpermitted shed burns, floods, or collapses onto something, your homeowner's insurer may deny the claim — including claims for damage the shed causes to other property.
Sale complications: Unpermitted structures show up in home inspections and title work. Buyers may demand retroactive permits (often with penalty fees), price reductions, or removal before closing.

Permit Cost & Process

If you do need a permit, the good news is that shed permits are among the cheapest and simplest permits out there. Typical fees run $50–$200. Most jurisdictions ask for a simple site plan sketch — your lot, the house, the proposed shed, and the distances to property lines — plus basic construction details (dimensions, height, foundation type). Approval commonly takes 1–4 weeks, and many small-structure permits are issued same-day over the counter. Compared to the cost of the shed itself (see our shed cost guide), the permit is a rounding error — and it protects your investment.

Ready to plan the build? Size your material list with the shed calculator and walk through the process in our how to build a shed guide.

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Reminder: permit rules are set by your local jurisdiction and vary widely. The thresholds above are the most common U.S. figures — confirm with your city or county building department before starting.

Frequently Asked Questions

In most U.S. jurisdictions, sheds up to 120 square feet don't require a building permit — that's the most common threshold, and some areas allow up to 200 sq ft. Exemptions usually also cap height at roughly 10–15 feet and require the shed to meet setback rules, commonly 5–10 feet from property lines. The popular 10×12 shed is exactly 120 sq ft, right at the line, so check whether your local rule says "up to" or "under" 120. Always confirm with your local building department, since thresholds vary by city and county.

Yes — in virtually every U.S. jurisdiction, running electrical wiring to a shed requires an electrical permit regardless of the shed's size. Even a shed small enough to be exempt from a building permit loses that simplicity the moment you add power. The electrical work typically needs to be inspected, and in many areas it must be done by a licensed electrician or, if DIY is allowed, pass the same inspection. Unpermitted shed wiring is a common cause of insurance claim denials after fires.

Possible consequences include stop-work orders, fines that often exceed the original permit fee many times over, and in worst cases a requirement to move or demolish the shed — especially if it violates setback rules. An unpermitted shed can also lead to denied insurance claims and complications when you sell your home, since buyers and inspectors flag unpermitted structures. Many jurisdictions offer retroactive permits, but these usually carry penalty fees and may require opening up finished work for inspection.