A barn or pole-barn slab is a 4-inch floor on a built-up, drained pad, thickened to 6 inches where equipment parks and at the edges where the building bears, with the post or column connection set to the building's drawing. The pad above grade and the water running away from it matter more than the slab.
Updated November 10, 2026 · DFW Stone & Concrete
County permits for a barn outside the cities vary by county, so check the page for yours.
A traditional pole building stands on pressure-treated columns embedded in concrete-backfilled holes, and the slab is poured afterward inside a pressure-treated skirt board that forms the slab edge; a supplier's guide calls pouring after the building is up the best time, with the skirt board's bottom even with the bottom of the floor. Alternatives are a slab on grade with column brackets, precast columns, or sonotube-and-bracket footings. A bolt-down metal building instead needs a thickened edge or grade beam poured first with anchor bolts to the bolt plan. Verify which system your building uses before the slab is quoted.
Source: Hansen Pole Buildings, pole building foundations
The same supplier puts it simply: on a well-drained site with good compacted fill, a nominal 4-inch slab is more than sufficient, and the strength of a floor is more a function of the fill beneath it than its thickness. For areas where heavy equipment, tractors or loaded trailers will be driven and parked, the guidance is 6 inches. A common layout is a 6-inch strip down the equipment bay and 4 inches in the stalls and tack room, with the thickness change shown on the sketch.
Source: Hansen Pole Buildings, concrete floor thickness for heavy equipment
Strip the topsoil, condition the clay, and build the pad up in compacted lifts so the finished floor sits above the surrounding ground and water falls away on every side; add swales or a French drain on the uphill side. On Blackland Prairie clay, Texas Parks & Wildlife's black, calcareous, heavy clay over chalk, a barn floor poured at grade on native soil will heave and hold water. Ask the quote for the fill material, lift thickness and a compaction standard; Fort Worth's 95 percent of standard Proctor is a usable benchmark.
Source: Texas Parks & Wildlife, Blackland Prairie ecoregion
Where a bolt-down building bears on the slab, the perimeter is thickened or turned down and the anchor bolts are set before the pour to the manufacturer's plan; where posts are embedded, the skirt board and the post holes carry the load and the slab edge is lighter. A supplier's guide warns that small precast footing pads under posts are often undersized to spread the building's load without settlement, so the post footing is its own line. Verify turndown depth and width and the bolt or bracket layout with the building supplier's foundation drawing; the slab crew builds to it, it does not design it.
Source: Hansen Pole Buildings, pole building foundations
Water lines to stalls, a frost-free hydrant, floor drains in a wash bay, conduit for lights and a sub-panel: all of it goes through the pad before the pour. A wash bay slopes to its drain and is often broom-finished coarse for grip; stall floors are often left rough or covered with mats. List every sleeve on the sketch with its size and location.
Barn floors are long rectangles, which is the shape most likely to crack at random. NRMCA guidance is contraction joints at 24 to 36 times the thickness, no more than about 15 feet apart, in near-square panels, cut to at least a quarter of the thickness within 4 to 12 hours of finishing. Steel sits on chairs in the top half of the slab, tied at crossings. Post locations get isolation joints so the slab can move without binding on the columns.
Source: NRMCA Concrete in Practice CIP 6, joints in concrete slabs on grade
This varies by county and the county pages on this site carry the sources. Collin County's FAQ lists barn and storage building among permanent structures that need a development permit. Ellis County lists shop, barn and carport as examples of activity that requires a permit, with a one-acre, 150-foot-frontage minimum. Denton County requires a development permit for any improvement to a property with a site plan showing distances to two property lines. Johnson County permits any new development and counts grading and paving as development. Dallas County permits residential and non-residential construction and grading in its unincorporated area. Tarrant County and Parker County issue no building permits and have no zoning outside the cities, so the quote is the record. Rockwall County's handbook does not mention barns; verify with the county's development coordinator. Inside any city limit, the city's accessory-structure rule applies instead.
Source: Ellis County, Department of Development FAQs
Pad built and compacted, forms and skirt boards set to grade, sleeves in, steel on chairs, bolts or brackets set to the plan, and a photo of all of it. Then the pour, the saw cuts on time, and a curing method named on the quote. The Portland Cement Association's reminder that most strength comes in the first month sets the date the first tractor rolls in.
Source: Portland Cement Association, curing in construction
It can, but a supplier's guidance is that pouring after the building is up, inside the skirt board, is the better sequence for an embedded-post building. A bolt-down building is the opposite: slab first.
Depends on the county: Collin and Ellis say yes and name barns; Denton and Johnson permit any new development; Tarrant and Parker issue no building permits. See the county pages.
Enough that water falls away on all sides after the yard settles; the building supplier or an engineer sets a number for your site. Verify it against the county's floodplain map if a creek is near.
Pattern, color method, sealer, stone and joint, or field thickness, edge, steel, base and membrane: one independent, insured North Texas contractor looks at the lot and writes it all down with dates.
Residential and acreage, in eight DFW counties. No price on this site, because the lot and the drawing decide the price.
One independent, insured North Texas contractor will call or text within one business day to set a time to look at it. You get a written quote with the pattern, color, stone and slab spec on it.