Do You Need a Permit to Build a Shed?

The honest answer is: it depends on size, and nobody can tell you the exact number without knowing your city or county. What is true almost everywhere is that a permit decision is driven by a handful of the same factors, and checking them before you pick a design saves a redesign later.

The size threshold that comes up most often

Many jurisdictions in the United States exempt sheds under roughly 100–200 square feet from a full building permit, though the exact cutoff varies by city, county, and sometimes by HOA on top of that. A shed that is 120 square feet might need nothing in one town and a full permit two towns over — this is not a number you can safely assume.

What changes the rules even for a small shed

• Setback distance: most areas require a minimum distance from property lines and other structures, regardless of the shed's size.
• Electrical or plumbing: running power or water to a shed usually triggers a separate permit even if the structure itself is exempt.
• Intended use: a shed used as a home office, guest space, or business space is often reviewed differently than pure storage.
• HOA rules: a homeowners' association can restrict size, placement, or appearance even where the city requires nothing.

The one call that saves a redesign

Before finalizing a shed design, one call to your local building department (often five minutes) answers the size threshold, setback distance, and whether your intended use changes anything. Doing this after the foundation is already poured is a far more expensive conversation.

Why this affects foundation choice too

In some areas, a shed over a certain size is required to sit on a permanent foundation rather than skids or blocks, which changes both the cost and the build timeline. This is another reason to confirm local rules before choosing between a gravel pad and a poured foundation.

Deciding on a foundation next? See gravel vs. concrete shed foundation.