Pier and Beam vs. Slab: Which Do You Have, and Why It Matters

Why the foundation type matters

When you call about a crack or a sloping floor, one of the first questions you will hear is "slab or pier and beam?" The answer changes what is likely going on, what the repair looks like, and roughly what it costs. It also changes what you can check yourself before anyone comes out.

• Slab foundation: the house sits on a single pad of poured concrete at ground level. There is no space under the floor.
• Pier-and-beam foundation: the house sits on wood beams that rest on short columns (piers) and a perimeter wall or beam, leaving a crawlspace underneath. HomeGuide describes the floor as sitting about 18 inches off the ground.

How to tell which you have

Walk around the outside of your house and look at the bottom few feet of wall:

• Crawlspace access door or vents (small screened openings near the ground) almost always mean pier and beam.
• Steps up to the front door are more common with pier and beam, because the floor is raised. A slab house often has one low step or none.
• Floors that feel a little bouncy or squeak, or hollow-sounding wood floors, point to pier and beam. Slab floors feel solid and hard underfoot, even under carpet.
• Visible concrete edge a few inches tall all around the base of the brick or siding, with no openings, usually means slab.

Your home's age is another clue. Census housing data does not record foundation type, so no one can tell you for sure from public records, but age is a strong hint in Oklahoma City.

What our data says about your neighborhood

Pier and beam was common in older construction, while new homes in our part of the country are almost all slabs. The National Association of Home Builders, analyzing Census Bureau construction data, reports that 97.9% of new single-family homes started in 2024 in the West South Central division (Oklahoma, Texas, Arkansas and Louisiana) were built on slabs.

Our Census ACS 2020-2024 figures show which OKC ZIPs have the most older homes:

ZIP	Median year built	Homes built before 1960
73107	1949	72%
73103	1938	71%
73118	1947	69%
73106	1942	61%
73119	1959	52%

If you live in one of these ZIPs, your house is more likely than average to be pier and beam. That is a likelihood, not a fact about your house; plenty of mid-century homes were built on slabs too.

The newer suburbs run the other way. In Edmond's 73012 the median home was built in 2007, in 73134 in 2005 and in 73179 in 2013, with fewer than 7% of homes built before 1960. Homes there are mostly slabs.

You can see your own ZIP's age and soil profile on our map.

How each type fails on Oklahoma City clay

Much of the metro sits on expansive clay that swells when wet and shrinks when dry. Scientists measure that as LEP (linear extensibility percent); our soil data puts south and west-central OKC ZIPs like 73159, 73139, 73119 and 73120 at 69% to 84% high shrink-swell land. Older ZIPs sit on clay too: 73119 has an LEP of 6.68 (high) and 73103 has 5.93. Damage usually comes from uneven moisture under a house rather than the soil type alone, so one dry corner or one leaking pipe can matter a great deal.

Slab foundations

A slab is one rigid piece, so when the soil under part of it shrinks or swells, the slab bends or tips. Common signs:

• Diagonal cracks in drywall from the corners of doors and windows
• Stair-step cracks in exterior brick
• Doors that stick or won't latch, gaps above doors or windows
• Floors that slope toward one corner or edge
• Cracks in tile floors running in a line

Edges usually move first, because the soil at the perimeter wets and dries more than the soil under the middle of the house. In a drought the edges can drop; after heavy rain they can heave.

Pier-and-beam foundations

Pier and beam has more parts, so it can fail in more ways:

• Settled or tilted interior piers, leaving soft or sagging spots in the middle of a room
• Perimeter beam movement, which shows up as brick cracks and gaps much like a slab
• Shims that have shifted, crushed or rotted. A shim is a thin spacer between the pier and the beam.
• Wood damage: rot, termites or moisture in the sill plate (the wood that sits on the perimeter wall) and floor joists
• Bouncy or sloping floors without much cracking outside

The upside is access: a contractor can crawl under and see exactly what moved. The downside is that a damp, poorly vented crawlspace can rot wood regardless of what the soil does.

If you have spotted cracks or sloping floors and aren't sure which category they fall into, send a photo.

Typical repairs and published price ranges

Prices below are published ranges from national cost guides, not quotes. Your scope depends on an inspection.

Pier-and-beam repairs

Repair	What it is	Published range
Shimming and re-leveling	Jacking beams back up and adding or replacing shims	$1,000 to $3,500 (HomeGuide)
Adding or replacing piers	New support columns, often steel replacing wood	$1,000 to $1,600 per steel pier (HomeGuide)
Joist replacement	Replacing damaged floor framing	$350 to $1,000 per joist (HomeGuide)
Vapor barrier	Plastic sheeting over crawlspace soil to cut moisture	$1,200 to $4,000 (HomeGuide)
Overall pier-and-beam repair	Varies by scope	$2,000 to $15,000+ (HomeGuide); $750 to $25,000 (Angi)

Sill plate repair is often part of the job on older homes; HomeGuide notes older homes may need sill plates replaced.

Slab repairs

Repair	What it is	Published range
Steel push piers	Steel pipe driven under the slab edge to support and lift it	$990 to $1,350 per pier (Olshan)
Helical piers	Screw-like steel shafts turned into the ground	$3,500 to $4,400 per pier (Olshan)
Pressed concrete piers	Concrete cylinders jacked into the ground	Generally lower than steel; ask for a per-pier price
Mudjacking (slabjacking)	Pumping a cement mix under a sunken slab to raise it	$4 to $9 per sq ft (HomeGuide); $500 to $1,300 per job (Angi)
Overall slab repair	Varies by scope	$1,000 to $10,000 (HomeGuide)

Polyjacking is a cousin of mudjacking that injects expanding polyurethane foam instead of a cement mix. It is lighter and uses smaller holes. Mudjacking and polyjacking lift slabs but do not reach deeper, more stable soil, so on active clay they are more often used for driveways, patios and walkways than for a house that keeps moving. For full cost detail, see our foundation repair cost guide.

Want to know which of these your house actually needs? A local foundation specialist can look in person, including under a pier-and-beam floor, and write up the scope.

Prevention that works for both types

The same moisture habits help either foundation. Colorado State University Extension, writing about expansive clay, advises:

• Grade the ground so water drains away from the house.
• Keep sprinkler spray at least five feet from the foundation.
• Plant trees at least fifteen feet away.
• Leave downspout extensions in place rather than draining roof water into beds next to the house.

For pier and beam, add one more: keep the crawlspace vents clear and check under the house once a year for standing water, damp wood or sagging. For slabs, watch for a sudden jump in your water bill, which can mean a leak under the slab. Our drought guide covers watering during dry spells.

Which is "better"?

Neither type is immune to clay. Slabs are simpler and are what almost all new homes here use. Pier and beam is easier to inspect and re-level, but adds wood that can rot. What matters more is the condition of the foundation you have and whether water around it is under control. If you are buying an older home in 73103, 73106, 73107, 73118 or 73119, assume pier and beam is possible and ask for a crawlspace inspection. See also signs of foundation problems.

Not sure whether what you are seeing is serious? The symptom checker sorts common signs in about a minute.