A slab bid for a shop, garage, carport, RV pad or small addition should list the slab thickness, the thickened edge or beam detail, the steel, the base and compaction, whether a vapor retarder goes under it, anchor bolt layout for a building kit, and whether an engineer's design or city inspection is required.
One vetted, 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 full spec.
Updated November 10, 2026
Habitable additions on DFW clay almost always need an engineered design.
A slab that holds a building has edges that carry walls and a floor that may be finished, so the bid has to speak to the thickened edge (how deep and how wide), the steel in the edge as well as the field, and the vapor retarder if the inside will be conditioned or floored. ACI 332-20, the residential concrete code, has separate chapters for slab thickness, vapor retarders and concrete cover, which tells you these are not details a bidder gets to skip.
Source: ACI 332-20, Code Requirements for Residential Concrete (preview)
Ask for the field thickness, the edge depth and width, and the bar size in each. A 30x40 shop slab and a carport pad are not the same spec. If the bid lists one thickness for the whole thing with no edge detail, the crew is planning a flat slab, which is fine for a pad and not for a building.
Most of the eastern metro is on the Blackland Prairie's heavy clay and the western counties on the sandy loam and limestone of the Cross Timbers and Grand Prairie. Either way the bid should say the pad is built up with select fill or crushed stone, compacted in lifts, and that soft topsoil is removed first rather than buried under the slab.
Source: Texas Almanac, Physical Regions of Texas
For a shed, carport or equipment pad, usually not. For a room addition, casita, detached garage you will live over, or a large metal building, the city will often require a sealed design and inspections, and on expansive clay that design may be a post-tensioned or beam-and-slab foundation. The bid should say whether the design fee is included and who schedules inspections. Verify with your city before you sign.
If a metal building or a kit is going on the slab, the bid should reference the kit's anchor bolt plan and say who sets the bolts and sleeves for plumbing and electrical. Setting them after the pour means drilling your new slab.
Concrete gains most of its strength in the first month. The bid should give a date for framing or kit erection, and a slab that will be finished inside should be allowed to dry as well as cure.
Source: Portland Cement Association, curing in construction
Depends on what rolls on it. The bid should state the field thickness and the edge detail separately rather than one number for the whole slab.
If the interior will be conditioned, floored or used for storage that cannot get damp, yes. Ask the bidder to put it on the bid or to say why it is left off.
Most DFW counties issue a development permit for new construction in unincorporated areas even though they do not inspect buildings; a few, like Rockwall, require a county notice and third-party inspections for a house. See the county pages on this site.
That is normal. What you want is the number and who hires the engineer, so the two bids you compare both include it.
Tell us the job and where it is. One independent, insured North Texas contractor will look at it and send a written quote with thickness, steel, base, joints, finish, permits and dates on it.
Residential and commercial, in all eleven DFW counties. No price on this site, because the lot decides the price.
One vetted, 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 full spec.