Garage floor cost — material + installed
Concrete Garage Floor Cost Calculator
Answer first: a 20x20 garage floor at 4 in costs ~$1,046 in material and $3,200–$7,200 installed. A 24x24 runs $4,700–$10,500 installed. Calculate your slab dimensions, check whether to repair or replace, and verify every line item in the contractor bid.
20x20 garage floor at 4 in
5.43 yd³ with 10% waste — 245 80-lb bags — ~$1,046 material
Ready-mix strongly recommended for slab volumes over 2 yd³. Installed cost $3,200–$7,200 depending on base, reinforcement, and finish.
24x24 two-car garage at 4 in
7.82 yd³ — 352 80-lb bags — ~$1,440 material
Two-car garages often need thickened perimeter edges (8 in). Add $800–$1,500 for thickened-edge design.
Garage floor cost per sq ft
$6–$12/sq ft installed; $3–$5/sq ft material only
Heated floors (radiant), vapor barrier, epoxy coating, and control joints are priced separately.
Interactive workflow
Run the numbers, then save or export the project
How much does a concrete garage floor cost per square foot?
A concrete garage floor costs $6–$12 per sq ft installed in 2026. Material alone runs $3–$5/sq ft ($1,046 for a 400 sq ft 20x20 garage). Labor, 4–6 in gravel base, vapor barrier, reinforcement, joints, and broom finish add $3–$7/sq ft. Epoxy coating adds $3–$12/sq ft on top.
How much does a 20x20 concrete garage floor cost?
A 20x20 garage floor (400 sq ft) at 4 inches thick costs $3,200–$7,200 installed in 2026. Material: 5.43 yd³ with 10% waste (~$1,046 at $4/bag × 245 bags). Labor, base, vapor barrier, and finish: $2,154–$6,154. Add $1,000–$2,000 for a thickened perimeter edge if the slab will support heavy loads.
How thick should a garage floor be?
A residential garage floor should be at least 4 inches thick for standard passenger vehicles. For heavy trucks, SUVs, or storage loads over 10,000 lb, use 5–6 inches with #4 rebar at 24-in spacing. Many contractors recommend a 6-in thickened perimeter edge regardless of thickness. Check local code.
Should I repair or replace my garage floor?
Repair when cracks are under ¼ in, isolated, and the slab is level. Consider crack repair + epoxy coating for cosmetic improvement ($3–$8/sq ft). Replace when cracks are wide or structural, the floor is heaved, or spalling covers more than 25% of the surface. Full replacement costs $6–$12/sq ft.
Does a garage floor need rebar or wire mesh?
Most codes allow either rebar (#4 at 18–24 in spacing) or welded wire mesh (6×6 W2.9×W2.9) for a standard residential garage floor. Rebar is stronger and better for heavy loads. Wire mesh is cheaper and easier to install DIY. Fiber reinforcement (synthetic fibers in the mix) reduces plastic shrinkage cracking but is not a structural substitute.
What does a garage floor concrete bid include?
A complete bid should cover: excavation and grading, 4–6 in compacted gravel base, vapor barrier (6-mil poly), concrete (mix spec, yd³, psi), reinforcement (rebar or mesh), placement and finishing (broom, trowel, or exposed aggregate), control joints, curing compound, and cleanup. Permits, epoxy coating, and radiant heat are typically separate.