A single-story Valley home with a concrete driveway and carport

Carport Slabs

Carport Slabs in Phoenix, AZ

A carport slab in Phoenix, AZ is the ground-level concrete under a freestanding or attached carport.

Under new or existing carports
Post footings to plan
Cars, trucks or RVs
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What a carport slab involves

A carport slab is a driveway-grade pad that sits under a roof, so it has to be planned with the structure: where the posts land, how they are anchored, and which way water runs off the roof and the slab. Carports are common across the Valley, from older homes with attached carports to steel carports added for an RV or a boat.

The slab is flatwork. The carport above it is a structure, and in Phoenix a structure over 200 square feet, or one attached to the house, needs a building permit. That permit and its plan set the post footings, so get the carport plan first and pour to it.

An older Valley home with a carport and a concrete drive — Older Valley homes often have a carport on an original slab. Replacing that slab is a common job when it has cracked or settled.

Before the pour

The carport plan or kit drawing, with post locations and footing sizes
The carport permit, if the structure needs one
What parks under it: cars, a truck, a trailer or an RV, which sets the slab thickness
Where roof runoff lands, so it does not undercut the slab edge
Whether the slab ties into an existing driveway, which needs a clean joint

Carport slabs in Phoenix, AZ: frequently asked questions

Does a carport need a permit in Phoenix?

The carport structure usually does. The City of Phoenix exempts only one-story detached accessory structures up to 200 square feet, and most carports are larger or attached to the house. The slab under it is ground-level flatwork, but it is planned together with the carport's permit and footings.

Can carport posts sit on the slab?

It depends on the carport design and its engineering. Many carport kits and engineered plans call for footings at the posts, either separate or thickened into the slab. The post locations and footing details come from the carport plan, so they should be known before the pour.

How thick should a carport slab be?

Like a driveway: 4 inches reinforced for cars, 5 to 6 inches for trucks, trailers or an RV. The posts and footings follow the carport's own plan.

Should the slab be poured before or after the carport goes up?

Usually before, with the post footings set out to the carport plan, so the slab can be finished without working around the posts. Where a carport already stands on dirt or gravel, the slab can be poured around the existing posts with isolation joints at each one.

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