Sheds create more permit confusion than any other backyard project, because the permit exemption and the placement rules are two different things. Here is the part that matters for your paperwork: if your shed needs a permit, the application needs a site plan, and even many permit-exempt sheds still need their placement checked.
The exemption trap
Most cities exempt small sheds from building permits, commonly under 120 or 200 square feet depending on the state (the shed permit rules by state cover the thresholds). Homeowners hear "exempt" and skip the paperwork entirely. Then the code officer letter arrives, because the exemption covers the building permit, not the zoning rules. Setbacks, easements, lot coverage, and accessory-structure counts apply to every shed, exempt or not, and a shed inside an easement or over a setback line has to move no matter how small it is.
That is why the site plan matters even when the permit does not: it is the five-minute check that saves you from relocating a fully built shed.
If you already know you need the drawing, shed site plans are drawn to your lot from county records and delivered in 24 to 48 hours from $89, with free revisions until your building department accepts them. The rest of this page is how to tell whether you need one, what the reviewer checks, and what it costs either way.
Where a shed permit is required, by the numbers
We maintain the shed rules on all 51 state guides on this site, 50 states plus Washington, DC, and the thresholds cluster far harder than the usual "it depends" answer suggests:
- 39 of the 51 guides describe a 200 square feet exemption line somewhere in common local practice, which traces back to the model code language most states adopt.
- 18 of the 51 reference a tighter 120 square feet line, either statewide or in their larger cities. Several states appear in both counts, because the threshold moves between jurisdictions inside the same state.
- The exemption is nearly always written around a one-story detached accessory structure under the size cap, with a height limit attached, commonly 10 to 15 feet.
- The exemption usually evaporates the moment the shed includes utilities. Run power for lights or a freezer, add plumbing or heat, and a building permit is required in most places regardless of floor area.
Two things follow. A shed of 200 square feet or larger is a permit conversation almost everywhere, and a permit application means a site plan. And the size number alone never settles it: check with your local building department for the figure that applies at your address, because your state's typical threshold and your city's adopted threshold are two different facts. The shed permit rules by state are the place to start, not the final word.
Setback requirements are the reason the drawing exists
Zoning decides where a shed on your property may sit, and the site plan is the only way a reviewer can confirm compliance from a desk. Three numbers carry most of the review:
- Rear and side setback requirements for accessory structures, commonly 3 to 10 feet depending on the town and the zone. These are usually looser than the setbacks that apply to your house, which is exactly why people who look up the wrong line in the zoning table end up drawing the shed in the wrong place.
- Separation from the house and from other buildings, which many building codes regulate independently of any property line.
- Lot coverage, the share of your parcel that structures may occupy, counted cumulatively with everything already standing.
Local building codes and the zoning ordinance are separate documents administered by separate desks, and a shed can satisfy one while violating the other. That is the single most common surprise in shed permitting: the building department says no permit is required, and the zoning department still has an opinion about where the shed goes. When the two answers seem to conflict, they usually are not conflicting at all, they are answering different questions.
What a shed permit costs and how long review takes
From the fee research behind our state guides, 250 tracked city records for sheds:
- Median permit fee: about $100. The full spread runs from $25 in the cheapest tracked cities to roughly $800 at the top, usually where the fee is calculated from project valuation rather than charged flat.
- Typical review: about two weeks at the median upper bound, with same-day counter approvals in some cities and up to eight weeks in the slowest.
Against that, the drawing is the smaller line item and the one most within your control. Look up your own city in the permit cost calculator, or read the full comparison on the building permit cost page.
What the shed site plan has to show
When a permit does apply, the reviewer checks the drawing for:
- Property lines with lot dimensions
- Existing structures, including the house, garage, and driveway
- The shed, to scale, with its footprint dimensions labeled, the same numbers the exemption threshold is measured against
- Setbacks from the shed to the rear and side property lines, written as numbers
- Separation between the shed and the house or other structures, which many codes regulate
- Easements, the classic avoidable shed rejection
- The basics block: north arrow, scale, parcel number or address
Getting the drawing without the drama
The drafted route: a shed site plan runs $89 to $259 and is delivered in 24 to 48 hours, drawn from county GIS and satellite imagery with the shed dimensioned, setbacks labeled, and free revisions until your building department accepts it. For a purchase most people make once, it is the shortest path between "I bought a shed" and "the city said yes."
The DIY route is legitimate for simple lots: the six-step drawing walkthrough shows the method, and the Pre-Submission Checklist catches the mistakes reviewers catch. Budget an afternoon, and be strict about drawing to a stated scale, because a mislabeled setback costs a correction notice and a redraw.
Five corrections that send shed plans back
Applying for a permit goes faster when you pre-empt the comments reviewers write most often:
- No setback numbers written on the drawing. The shed is in a legal spot and nothing proves it. Reviewers do not scale drawings with a ruler to find out.
- An easement crossing the shed. Utility and drainage easements sit on the recorded plat and are invisible in the yard. This is the correction that costs real money, because the fix is moving the shed rather than the drawing.
- The shed measured off the fence instead of the property line. Fences are routinely a foot or more off the boundary, and a plan drawn from one inherits that error permanently.
- No stated scale, or a drawing that does not hold the scale it claims. If the page says 1 inch = 20 feet, it has to measure that way everywhere.
- Existing structures left off. The house, the garage and the driveway all feed the lot-coverage math. Omit them and the reviewer cannot finish the calculation.
If the shed is already standing
Plenty of people arrive here after the fact, usually because a neighbor complained or a code officer drove past. The path is well worn and it starts with the same drawing: our guide to retroactive permits covers how to legalize work already done, and what happens if you build without a permit covers the range of outcomes honestly. A site plan showing the shed where it actually stands is the first thing the zoning department will ask for.
One more placement note
Prefab shed deliveries are unforgiving: the truck arrives, the shed goes where you point, and moving it later is a crane conversation. Settle the placement on paper first, against your real property lines, not the fence line, since fences are famously not on the boundary. The complete guide to site plans for permits covers how to verify your lines and everything else on this page in more depth.