Concrete driveways are estimated by square footage at a per-sq-ft installed price, or broken into volume (cubic yards), forming, reinforcement, and finishing as separate line items. The full-detail approach protects margin better on complex jobs.
Concrete Volume Formula
Cu yd = L × W × thickness (in ft) ÷ 27. For 4-inch driveway: thickness = 0.333 ft.
Example
20×40 driveway at 4 inches: 20 × 40 × 0.333 ÷ 27 = 9.87 cubic yards → order 10.5 with 7% overage
Waste factor: 7% concrete volume; 15% rebar
Measure driveway dimensions (L × W). Calculate cubic yards using the formula. Standard residential driveway: 4-inch thickness. Heavier use (RV parking, commercial): 5–6 inches. Calculate separately for thickened edges if used (6-inch perimeter with 4-inch field).
Inspect existing sub-base: compacted gravel at 4-inch depth is standard. If replacing an asphalt driveway, factor in asphalt removal ($1.50–$3.00/sq ft). If the sub-base is soft or poorly drained, add compacted gravel base ($1.00–$2.00/sq ft). Do not pour concrete over a soft sub-base — it will fail.
Perimeter forming: linear feet of driveway edge × height of form board. Standard 2×4 or 2×6 lumber. For a 20×40 driveway: 120 LF of forming. Include stakes, duplex nails, and form release in materials. Forming labor: 0.1–0.15 hrs/LF.
#4 rebar at 18-inch on-center grid: calculate the grid quantity from the plan. Alternatively, 6×6 W2.9 wire mesh (one roll per 750 sq ft): cheaper but less effective at crack control. Price rebar at cost + 20%; labor to place rebar: $0.40–$0.75/sq ft.
Broom finish (standard): included in base sq ft rate. Exposed aggregate: add $1.50–$3.00/sq ft. Stamped concrete: add $8–$18/sq ft for pattern and color. Sealer: add $0.50–$1.00/sq ft. Expansion joints (saw cut): $0.25–$0.50/LF.
Get a current concrete price the day you estimate
Ready-mix prices fluctuate with diesel fuel and aggregate supply. Never use a 2-week-old price on a new bid. A $15/yard price increase on a 10-yard pour is $150 of lost margin.
Require a site visit before every pour day
Verify sub-base condition, form placement, and rebar chairs the morning of the pour — before the truck arrives. Last-minute discoveries (soft spot, missing grade pin) on pour day are expensive.
Include a weather-delay clause
Concrete should not be placed when temperatures are below 40°F or above 90°F without special measures. Include this in your contract. Clients who push for a pour in marginal weather own the results — get it in writing.
A standard broom-finish concrete driveway runs $8–$14/sq ft installed in 2026, including sub-base prep, forming, 4-inch slab with rebar or mesh, and sealer. Stamped concrete is $16–$28/sq ft. Exposed aggregate is $12–$18/sq ft. Regional variation is significant — concrete prices and labor rates vary widely.
A 20×40 driveway at 4-inch thickness = 9.87 cubic yards. Order 7% extra for waste, form spillage, and sub-base absorption: 10.5 yards. Most batch plants have a minimum load of 5–7 yards — confirm before ordering a short load (which carries a $50–$150 surcharge).
#4 rebar at 18-inch on-center provides better crack control than wire mesh and is worth the additional cost ($0.50–$1.00/sq ft) for a 25-year driveway. Wire mesh often ends up at the bottom of the slab (kicked down during pouring) and provides minimal benefit. For residential drives, rebar is the professional standard.
Saw-cut control joints within 12–24 hours of pour (when concrete is hard enough to cut without raveling). Place joints at 10–12 foot intervals (panels should be roughly square). Joints should be cut to 1/4 of slab depth (1 inch for a 4-inch slab). Skipping control joints almost guarantees random cracking within 1–2 years.
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