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Concrete Patios in Houston, TX

Quick answer

A concrete patio in Houston should be poured over compacted soil and a base, slope gently away from the house, and be jointed into roughly square panels. On flat lots, plan where runoff goes before the pour. Check your city's permit rules and your HOA's limits on hard-surface coverage, and mention any future patio cover so the slab can be built for it.

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Many Houston-area homes were built with a small slab off the back door, and extending it is one of the most common concrete projects in the region. A bigger patio makes room for a table, a grill, an outdoor kitchen or a future patio cover. On flat, clay-heavy lots with heavy rain, the details that decide whether it lasts are drainage, base preparation and how the new slab meets the old one.

Planning the patio

  • Size for real use. Lay out furniture, the grill and walking room with a hose or string before anyone forms the slab.
  • Sun and heat. An unshaded slab facing west can get very hot on a Houston summer afternoon. Lighter colors, textured finishes and shade help.
  • Future structures. If you might add a patio cover, pergola or outdoor kitchen, say so now. Posts and heavier loads often need thickened areas or footings, and covered structures generally need a permit.
  • Access. Fenced backyards with no side gate may mean pumping concrete over the fence or wheeling it in, which affects price.

Drainage on a flat lot

A patio should slope gently away from the house. That sounds simple, but on Houston's flat lots there may be only a few inches of fall to work with, and a new slab can block the path water used to take across the yard. Ask where runoff will go, whether a yard drain or swale is needed, and whether gutters and downspouts should be rerouted. Water that pools against the foundation can also add to the seasonal swelling and shrinking of the clay beneath the house.

Extending an existing slab

Most extensions are poured against an existing patio. Contractors commonly drill and dowel rebar into the old slab or separate the two with an isolation joint, and each approach has tradeoffs on moving clay. Ask which they recommend and why. New concrete won't match the old color exactly, so some homeowners cover both with a coating or stain, or choose a contrasting border.

Base, thickness and joints

Patios are commonly about four inches thick over compacted soil and a sand or gravel base. Soil next to the foundation is often backfill from construction and may be looser than the rest of the yard. Control joints divide the slab into roughly square panels so shrinkage cracks follow the joints instead of running across the middle.

Finish options

  • Broom finish: economical and slip-resistant.
  • Exposed aggregate: textured and good underfoot.
  • Stamped or colored: patterned to look like stone, tile or wood. See stamped and decorative concrete.
  • Smooth trowel: attractive but slippery when wet, so it's less common outdoors.

Permits, HOAs and lot coverage

Permit rules for an uncovered patio vary across the region. The City of Katy, for example, lists patios among the work that needs a permit, while other cities treat a ground-level slab differently. Master-planned communities and The Woodlands also limit how much of a lot can be covered with hard surfaces, and patios count. Check with your city or county and your HOA before the pour is scheduled.

Questions to ask

  • How will the patio drain, and where will the water go?
  • Will you dowel into the existing slab or isolate it?
  • What base, thickness and joint layout are included?
  • Who handles permits and HOA submittals?

Ready to plan it? Request a patio contractor and share a photo of the space and the existing slab.

See how it works

How a concrete mixer truck delivers a pour. Press the buttons to run each step and see what happens inside. Made with Colorfigures ·
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Frequently asked questions

Do I need a permit for a patio in the Houston area?

It depends on where you live. The City of Katy lists patios among work that needs a permit, while other cities treat an uncovered ground-level slab differently. Covered patios generally need a building permit. Check with your city or county and your HOA.

Should a patio extension be tied into the old slab?

Contractors either dowel rebar into the existing slab or separate the two with an isolation joint. On moving clay each has tradeoffs, so ask which your contractor recommends and why.

How do I keep a patio from flooding on a flat lot?

Give the slab a gentle slope away from the house, keep downspouts from dumping onto it, and plan where the water goes next, which may mean a swale or yard drain. Don't let a new slab block the path water used to take across the yard.

Sources and further reading

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