Do I Need a Permit for a Shed? Size Limits and Rules by City

Backyard sheds occupy a strange space in building codes. They are simple structures, but they are subject to zoning setbacks, size limits, and in many cases building permits. The rules vary enough between cities that a shed that is permit-free in one town requires a full application in the next.

The common exemption threshold: 120 to 200 square feet

Most cities exempt small sheds from building permit requirements if they fall under a specific size. The most common thresholds are 120 square feet (the International Residential Code default) and 200 square feet. A standard 10x12 shed at 120 square feet hits the threshold exactly, which means you need to check whether your city's rule is "under 120" or "120 or under." That one square foot matters.

Setback requirements still apply

Even permit-exempt sheds must comply with zoning setback requirements. Most cities require sheds to be at least 3 to 5 feet from side and rear property lines. Sheds in front yards are usually prohibited entirely. Corner lots have additional restrictions because both street-facing sides are treated as front yards in many zoning codes. Placing a shed in a utility easement is prohibited regardless of size.

Cities with stricter rules

Some cities require permits for any detached structure regardless of size. San Francisco requires a permit for any new structure. New York City requires permits for all accessory buildings. On the other end, Houston (which has no zoning code) imposes minimal restrictions on residential sheds.

Height limits

Most cities cap accessory structure height at 12 to 15 feet. This matters if you are building a barn-style shed with a loft or a two-story storage building. Exceeding the height limit triggers a variance process even if the footprint is small enough to be permit-exempt.

What happens if you skip the permit

Building without a required permit can result in a stop-work order, fines ranging from $100 to $1,000, and in the worst case a demolition order. More commonly, the issue surfaces when you sell your home. A buyer's inspection or title search may flag unpermitted structures, which can delay or kill a sale. Retroactive permits are available in most cities but cost more than the original permit and may require bringing the structure up to current code.