Here is the short answer: if your patio needs a permit, the application needs a site plan, and even the patios that skip the permit face a zoning check most homeowners have never heard of. For a project people describe as "just a slab," an awful lot of the review happens on the drawing.
If you already know you need the drawing, a patio site plan is drawn to your lot from county records and delivered in 24 to 48 hours from $89, with free revisions until your city accepts it. The rest of this page is how to tell whether your patio needs a permit at all, and what the reviewer recalculates when you submit.
The patio paradox
Ground-level, uncovered patios are the friendliest project in permitting, often exempt from building permits entirely, and the patio permit guide covers where that line sits state by state. So why do patio applications still ask for a drawing? Because what a patio changes is not structural, it is hydrological. Every square foot you pave changes how much of your lot sheds rainwater instead of soaking it up, and cities regulate exactly that.
Impervious coverage: the check nobody expects
Many cities cap the percentage of a lot that can be covered by impervious surfaces: roofs, driveways, walkways, pool decks, and most patios. When your application lands, the reviewer takes your lot's square footage, adds up everything already paved or roofed, adds your proposed patio, and checks the total against the cap.
All of those numbers come from your site plan. This is the detail that separates a patio site plan from other projects: the drawing has to show your existing hardscape, not just the new slab, because the math is cumulative. Leave the driveway and walkways off the plan and the reviewer either sends a correction notice or, worse, approves against numbers that a later inspection contradicts.
Patio permit requirements, by the numbers
Reading across all 51 state guides on this site, patio permit requirements split cleanly along one line, and it is not size:
- 40 of the 51 guides describe ground-level uncovered patios as exempt from a building permit in typical local practice.
- 50 of the 51 describe covered patios and patio structures as requiring one.
- Where a size or height trigger appears, 12 guides cite a 200 square feet threshold and 9 cite the 30-inch-above-grade rule that also governs decks.
So the honest summary is that flat, uncovered concrete slabs typically require no building permit, and anything with a roof over it typically requires one. That is a useful rule and a dangerous one, because it describes the building permit only. Zoning review, impervious coverage and setback requirements do not follow the same line, which is the whole subject of the next two sections.
Your building department is the authority for your address, and the patio permit guide collects the state-level patterns.
Setback requirements apply even when the permit does not
This is the part homeowners are most often surprised by. A concrete patio that needs no building permit is still a structure as far as most zoning ordinances are concerned, and most ordinances set a minimum distance from a paved surface to the property line, commonly in the 3 to 5 foot range for flatwork. Building codes and zoning ordinances are separate rule sets with separate enforcement, and "no permit required" answers only the first.
Two practical consequences:
- A patio poured to the property line is a zoning violation in most of the country even where nobody ever needed to pull a permit for it.
- Because it is concrete, the remedy when it is discovered is demolition rather than paperwork. This is the one project on this site where the cheapest possible mistake is still expensive.
What a patio permit costs and how long it takes
From the 250 tracked city records behind our state guides:
- Median permit fee: about $175 for patios that need one, with the full range running from $20 to roughly $1,000 at the top, typically where the fee is calculated from project valuation.
- Typical review: about three weeks at the median upper bound, which is the slowest of the four common projects we have parsed review times for, mostly because covered patios pull in structural review.
Look up your own city in the permit cost calculator for a figure you can budget against.
The stop work order scenario
The reason to settle this on paper is that concrete is poured once. A stop work order posted mid-project is the outcome that turns a weekend patio into a season-long problem: work halts, the department opens a case, and the resolution usually requires exactly the drawing that would have taken an afternoon beforehand. Where the finished slab turns out to sit inside a setback or an easement, the department can require it removed, and no amount of after-the-fact paperwork changes that.
If that has already happened, retroactive permits walks through legalizing work that is already done, and what happens if you build without a permit covers the realistic range of consequences.
What the patio site plan has to show
- The patio footprint, to scale, with dimensions and total area labeled, since fees and review paths often key off the square footage
- Setbacks from the patio edge to your property lines, which apply even where the building permit does not
- The relationship to the house, drawn clearly, because uncovered flatwork and an attached covered patio are reviewed under different rules
- Existing paved and roofed surfaces, so the impervious-coverage math works
- Easements and drainage: the patio must stay out of recorded easements, and the grading should not aim runoff at your neighbor's lot
- The basics block: north arrow, scale, parcel number or address
Pavers, gravel and the impervious question
A common follow-up: does switching from poured concrete to pavers change the answer?
For the building permit, rarely. Cities that exempt a ground-level slab generally exempt a ground-level paver patio on the same terms, and cities that require a permit for one require a permit for the other. The trigger is the roof and the height above grade, not the material.
For the coverage math, sometimes. A growing number of jurisdictions give partial credit for permeable pavers or open-jointed systems, counting only a share of the area against the impervious cap. Where that credit exists it is written into the ordinance as a specific percentage, and your drawing has to identify the surface type before a reviewer can apply it. Where it does not exist, pavers count exactly like concrete.
Gravel is the least predictable of the three. Some ordinances treat a compacted gravel patio as pervious, some count it as impervious once it has a compacted base, and plenty do not mention it at all, which leaves the call to the reviewer. If gravel is your plan and your lot is anywhere near its coverage cap, that is a question worth asking the counter rather than assuming.
If your patio has a roof
One word changes the whole review: cover. A roofed or enclosed patio is a structure, and it needs a permit almost everywhere, including cities that exempt every slab. The site plan stays the anchor document, now showing the cover's footprint and whether it is attached or freestanding, with the structural details on accompanying building plans. If that is your project, start from the patio permit guide so the permit side does not surprise you, and expect the site plan to be non-negotiable.
Getting the drawing
The drafted route: a patio site plan runs $89 to $259 and is delivered in 24 to 48 hours, drawn to scale from county GIS records and satellite imagery with the footprint dimensioned, setbacks labeled, existing hardscape shown for the coverage math, and free revisions until your city accepts it.
The DIY route suits a simple lot and a city that accepts hand-drawn plans: the six-step walkthrough shows the method and the Pre-Submission Checklist is the final gate. The patio-specific discipline is measuring and drawing the surfaces you already have, because that is the part reviewers actually recalculate.
Before you pour
Concrete is the least movable mistake in the yard, so settle the placement on paper against your real property lines, not the fence line. Then spend two minutes on your city's checklist: some departments add grading or drainage notes for larger patios, and coastal and floodplain areas add their own. For everything about the drawing itself, the complete guide to site plans for permits goes deeper on each element above.