Permit guide · Patio
It depends, and the answer isn't as simple as "concrete slab = no permit." Whether your patio needs a permit comes down to three things: is it covered or uncovered, does it push your lot over impervious surface limits, and does it meet setback requirements? A simple ground-level patio might be exempt, but add a roof and you're in full building permit territory.
Enter your address to find your building department, then answer a few questions to see if you likely need a permit.
What's an AHJ?
The specific city, village, or county office that issues permits. Their boundaries don't always match your mailing address.
GPS-verified
We cross-check your coordinates against municipal boundary polygons, not just ZIP codes.
Wrong AHJ = weeks lost
Filing with the wrong building department means your application sits unreviewed.
The short answer
An uncovered, ground-level patio (concrete, pavers, stone) often doesn't require a building permit. But it still has to comply with your lot's impervious surface limits and setback rules, which are zoning requirements, not building code requirements. A covered patio (patio cover, pergola with a solid roof, attached awning) almost always requires a building permit because it's a roofed structure with footings and structural loads. An enclosed patio (screened-in porch, three-season room) is treated as an addition.
What we check
This is the #1 hidden requirement homeowners miss. Many AHJs limit total impervious surface (buildings + driveways + patios + sidewalks) to 40-60% of your lot area. Your new patio counts. Exceeding the limit may require a stormwater management plan like a rain garden, dry well, or French drain. Permeable pavers can reduce your impervious calculation.
An uncovered patio at ground level is usually the simplest case. A covered patio requires structural review: post footings below frost depth, roof engineering for snow and wind loads, and attachment details if connected to your house. The distinction between "pergola" (open slats) and "patio cover" (solid roof) matters, and some AHJs treat them differently.
Covered patios typically must meet the same setbacks as your house (5-15' from property line). Uncovered patios may have reduced or zero setback requirements depending on your AHJ.
Patio surfaces must slope away from your house foundation at a minimum of 1/4 inch per foot. You cannot direct drainage onto a neighbor's property.
Adding outlets, lighting, or ceiling fans to a covered patio requires a separate electrical permit. Outdoor receptacles must be GFCI-protected.
Per state
IL
Suburban AHJs commonly limit impervious surface to 45-55% of lot area. Chicago has a specific stormwater management ordinance. Check before you pour.
WI
UDC applies to covered structures. Impervious surface limits are especially strict in lake communities and waterfront properties. 48" frost depth for covered patio footings.
IN
Varies widely. Marion County (Indianapolis) has MS4 stormwater requirements. Rural areas may have no impervious surface limits, but still have setback rules.
Watch for these
Done for you · from $99
Whether it's a simple concrete pad or a covered patio with electrical, we research the exact requirements for your address (impervious surface limits, setbacks, structural codes, and any stormwater rules) and give you a clear answer.
Our DIY Permit Package currently covers sheds and garages. For patio projects, our Done-For-You experts handle the research.
Tell us about your project and we'll send you a custom quote within 24 hours.
500+ permits per year, in person
Built by a former permit tech who processed 500+ building permits per year across IL, WI, and IN. We don't just check if you need a building permit, we check zoning too.