Do you need a permit to build a shed? In most of the country, the answer turns on 200 square feet. If your shed is one story, detached from the house, isn’t a storm shelter, and comes in at or below that floor area, you can typically build without a permit. Go bigger, add a permanent foundation, run electricity or plumbing to it, or build in a flood zone or historic district, and a permit is almost certainly required. The part that catches homeowners off guard: “no permit required” never means “no rules apply.”
When a Shed Needs a Permit
The 200-square-foot threshold comes from the International Residential Code, which forms the basis of building regulations in 48 states. Roughly, that’s a 10-by-20 or 14-by-14 shed. Many local jurisdictions adopt the IRC number directly. Others set lower limits of 100 or 120 square feet. A few are more generous, but that’s the exception, not the rule.
Measure by the exterior dimensions of the structure, not the usable interior. If your design sits right at the edge of the local threshold, a few inches of overhang or an exterior wall thickness you forgot to count can push you over.
Size isn’t the only trigger. Several other factors can require a permit even when the footprint is small:
- Height. Local codes set maximum heights for permit-exempt structures, commonly in the range of 10 to 14 feet from grade to the peak of the roof. A steep roof pitch or a loft design can push a small-footprint shed over the limit.
- Foundation type. A shed resting on concrete blocks, gravel pads, or wooden skids is generally treated as temporary. Pouring a concrete slab or installing concrete footings almost always triggers a permit regardless of the shed’s size.
- Utilities. Running electricity, plumbing, or gas to the shed requires separate trade permits and inspections for each type of work, even if the shed itself is small enough to be permit-exempt.
- Flood zones. If your property sits in a FEMA-designated Special Flood Hazard Area, the normal size exemptions often don’t apply. Accessory structures in flood zones must meet National Flood Insurance Program requirements, including anchoring to resist flotation and collapse, using flood-resistant materials below the base flood elevation, and elevating mechanical equipment above it. A floodplain development permit is typically required even for a small shed.1FEMA. Floodplain Management Requirements for Agricultural and Accessory Structures
- Historic districts. Properties in a designated historic district usually need design review approval from a local historic preservation board before any new structure goes up, with restrictions on materials, colors, roof style, and visibility from the street.
Rules That Still Apply If You Don’t Need a Permit
This is where homeowners get into real trouble. The IRC says explicitly that exemption from a permit does not authorize work that violates any other provision of the code or local ordinances. Your shed may not need a permit, but it still has to follow every zoning rule on the books.
Setbacks are the most important of those rules. They dictate how far your shed must sit from property lines, your house, and any easements. Side and rear setbacks for accessory structures typically start at 5 feet but vary widely. Some jurisdictions require 10 feet or more from a rear property line, and corner lots often have stricter rules on the street-facing side. Your property may also have utility or drainage easements that aren’t obvious from the yard but show up on your plat or survey.
Most communities also restrict sheds to the rear yard. Placing one in a front or side yard is either prohibited outright or requires a variance, which is a formal request to deviate from the zoning code. Variances involve a hearing, your neighbors get notified, and approval is not guaranteed.
If you live in a community governed by a homeowners association, check your HOA’s covenants before you do anything else. HOA rules frequently go beyond what the local code requires, restricting shed size, materials, color, roof style, and even which part of the backyard you can use. You’ll need written HOA approval in addition to any municipal permit. Skipping this step can lead the HOA to force you to modify or remove a shed that’s perfectly legal under local building codes.
Pre-Fab and Delivered Sheds Follow the Same Rules
Buying a finished shed from a retailer and having it dropped off by truck doesn’t bypass permit requirements. The same size, height, foundation, and setback rules apply whether you build from scratch or take delivery of a complete structure. The jurisdiction doesn’t care who built it; it cares about what’s sitting on your lot.
Some retailers market their products as “permit-free” because they fall under the 200-square-foot threshold. That may be true for the building permit itself, but it ignores zoning compliance, setbacks, and HOA restrictions. The retailer won’t be the one paying fines if your shed sits too close to the property line.
How to Confirm the Rules for Your Property
Start at your local municipal or county government website. Look for the building department, planning department, or code enforcement section. Many jurisdictions publish accessory structure guides that spell out the size threshold, height limit, setback distances, and any special overlay zones like floodplains or historic districts.
If the website is vague or outdated, call the building department. A permit technician or zoning officer can tell you the exact rules for your property in a five-minute conversation. Have your address ready so they can check for easements, flood zone designations, or overlay districts tied to your specific lot. The call is free and can save you thousands of dollars in mistakes.
What the Permit Process Looks Like
If your shed does need a permit, the process is more straightforward than most people expect. You submit an application to the local building department, usually through an online portal, along with a site plan and sometimes basic construction drawings. Permit fees for a standard backyard shed generally run from a few dozen dollars to a couple hundred, depending on the jurisdiction and the scope of work.
The site plan is the most important document. It needs to show your property boundaries with dimensions, the footprint and location of your house, all existing structures, and the proposed shed location with measurements to each property line. Include easements, driveways, and the scale of the drawing. If construction drawings are required, those typically show the floor plan, elevations, and foundation details.
After submission, a plan reviewer checks the application against local building and zoning codes. Approval for a simple shed usually takes a few days to a couple of weeks. Once the permit is issued, post it visibly at the site. Most jurisdictions require at least two inspections: one after the foundation is set and a final inspection when construction is complete. Don’t schedule the final until everything is finished, including any trade work. The permit isn’t closed until that final inspection is signed off.
What Happens If You Skip the Permit
The risks are real and go well beyond a slap on the wrist. If a building inspector discovers unpermitted construction, they can issue a stop-work order immediately. From there, the typical progression is fines, a requirement to apply for a retroactive permit, and potentially an order to tear the structure down.
Fines vary enormously. Some jurisdictions charge a flat penalty; others impose daily fines that accumulate until the violation is resolved. A handful charge double or triple the normal permit fee as a penalty for starting work without authorization. The fines alone routinely exceed what the permit would have cost.
If the shed violates setbacks or other zoning rules that can’t be cured by a retroactive permit, the municipality can order you to demolish it. You’d bear the full cost of tearing it down and hauling it away.
Insurance
Homeowners insurance companies treat unpermitted structures as a liability. If your shed is damaged in a storm or causes damage to a neighbor’s property, your insurer can deny the claim on the grounds that the lack of a permit constitutes negligence. Some insurers will raise your premium or cancel the policy entirely if they discover unpermitted work. An injury that happens in or around an unpermitted shed can leave you personally liable for medical costs the policy would otherwise cover.
Selling the Home
An unpermitted shed almost always surfaces during a sale, through the buyer’s inspection, a title search, or the lender’s appraisal. Mortgage lenders frequently refuse to finance a property with known code violations, which can stall or kill a deal. Even a willing buyer will negotiate the price down to cover the cost of resolving it. You’ll likely need to either obtain a retroactive permit, which may require bringing the structure up to current code, or remove the shed before closing.
Property Taxes
Adding a permanent structure can trigger a reassessment that raises your property tax bill. Assessors often learn about new structures through the permit process, which is one reason some homeowners try to skip it. The strategy backfires: assessors also use aerial photography, neighbor complaints, and property sales to identify undisclosed improvements. A shed on a temporary foundation like blocks or skids is less likely to affect your assessment than one on a concrete slab, but practices vary. If this matters to your decision, ask your local assessor’s office how accessory structures are handled before you build.