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What to look for on a concrete quote
Concrete quotes are priced per square foot, but the price swings 2x based on thickness, reinforcement, finish, and preparation. A quality quote specifies PSI strength, slab depth, rebar or mesh, control joints, and cure method — not just a square-footage number.
Driveways typically 4" thick; heavy vehicles or commercial 5–6". Patios 4" standard. Slabs under houses 4–6".
3,000 PSI standard for residential. 4,000 PSI for driveways with heavier vehicles. 5,000 PSI for commercial.
Wire mesh is budget; #4 rebar on 16" grid is standard for driveways; fiber-reinforced mix is newer alternative.
4" compacted gravel base under slab. Expansive soils need more; sandy soils less.
Control joints every 8–10 ft prevent random cracking. Expansion joints where slab meets other structures.
Broom finish (standard, slip-resistant), smooth trowel, stamped, exposed aggregate, or stained/colored.
Water cure, curing compound, or plastic sheet. Proper cure is critical first 7 days.
1/8"–1/4" per foot away from house. Should be called out on quote.
Control joints cut with concrete saw within 24 hours of pour.
Required in most jurisdictions for driveways, large patios, and any structural slab.
Cracking (usually 1-year limited), settlement (1–5 yrs), workmanship (1–2 yrs).
Red flags in a concrete quote
A 3" slab saves $1–$2/sq ft but fails 5–10 years earlier. 4" is minimum for driveways; some inspectors won't pass 3".
Unreinforced concrete cracks badly within 2–5 years. Mesh is bare minimum; rebar is standard for driveways.
Calcium chloride speeds cure but weakens final concrete. Acceptable for indoor or small work, not for driveways or structural.
Concrete poured directly on soil settles unevenly. 4" compacted gravel base is standard; skipping this causes cracking and settlement.
All concrete cracks eventually. Control joints force cracks into straight lines where you want them. Without joints, random cracks ruin appearance and structure.
Concrete has thin margins. $3/sq ft quote for driveway concrete is usually a lowball with thin slab, no reinforcement, or skipped prep. Fair market is $6–$12/sq ft installed.
Quality concrete contractors offer at least 1-year workmanship warranty covering excess cracking and settlement. No warranty = bargain crew.
Common hidden costs and change orders
These items are often missing from the initial concrete quote and show up later as change orders or surprise fees. Ask about each before signing.
- Removal of existing concrete ($2–$6/sq ft)
- Subsoil excavation / regrading for drainage
- Thickened edges for driveway apron or structural loads
- Decorative finish upcharges (stamped, colored, exposed)
- Sealer application ($0.50–$1.50/sq ft)
- Expansion joints against existing structures
- Steel reinforcement upgrade (rebar vs mesh)