Concrete Garage Floor Cost Calculator
Estimate your concrete garage floor costs with our free calculator. Get detailed pricing for materials, labor, and total installation cost for any garage size.
Dimensions
Pro Tips
- →Garage floor installation costs $3-8 per square foot for a standard broom finish
- →A standard 2-car garage (20x20 ft) costs $1,200-$3,200 installed
- →Upgrade to 5-inch thickness for heavy vehicles or workshop use — adds $0.50-1.00 per sq ft
- →Epoxy coating adds $2-5 per square foot but dramatically extends floor life
- →Control joints every 10-12 feet prevent cracking and are included in professional installs
Estimated concrete cost (materials + delivery) · For projects over 1 cubic yard, ready-mix is typically more economical and easier to work with.
245 bags × 80lb
5.43 cubic yards + delivery
400 sq ft × $3.00–$8.00/sq ft
Prices vary by location and time. Contact local suppliers for accurate quotes.
Includes 10% waste factor
For general step-by-step instructions, read our complete Garage Floor Thickness and Garage Floor Epoxy Guide.
Garage Floor Costs: What Determines Your Price
Garage floors are among the most cost-effective concrete projects — large, flat, rectangular slabs with straightforward access. The $3–8/sq ft range reflects genuine variation in substrate conditions, thickness, and finish requirements.
Cost Breakdown: Standard 2-Car Garage (400 sq ft)
| Item | Cost Range |
|---|---|
| Subgrade prep (grading, compaction) | $200–600 |
| Gravel base (4 inches) | $150–300 |
| Vapor barrier | $100–200 |
| Concrete (5.4 cu yd at 4 inches) | $800–1,200 |
| Forming and placement labor | $500–900 |
| Broom finish and control joints | $300–600 |
| Total installed | $2,050–3,800 |
Project Examples by Garage Size
| Garage Type | Dimensions | Area | Installed Cost |
|---|---|---|---|
| 1-car | 12×20 ft | 240 sq ft | $720–$1,920 |
| 1.5-car | 16×20 ft | 320 sq ft | $960–$2,560 |
| 2-car standard | 20×20 ft | 400 sq ft | $1,200–$3,200 |
| 2-car tandem | 12×40 ft | 480 sq ft | $1,440–$3,840 |
| 3-car | 30×22 ft | 660 sq ft | $1,980–$5,280 |
| Oversized workshop | 24×30 ft | 720 sq ft | $2,160–$5,760 |
When to Go Thicker
Standard 4-inch thickness handles normal passenger vehicles and light use. Increase to 5–6 inches if:
- You park heavy trucks, RVs, or vehicles over 6,000 lbs
- You run a home workshop with floor-standing machinery
- You plan to install a vehicle lift (requires an engineered slab design)
- Your soil has poor bearing capacity
Each additional inch adds approximately $0.40–0.70/sq ft installed.
Finish Options and Upgrade Costs
| Finish | Added Cost | Best For |
|---|---|---|
| Broom finish (standard) | — | Any garage |
| Epoxy coating | $2–5/sq ft | Workshop, decorative |
| Polyurea/polyaspartic | $3–7/sq ft | Faster cure, more durable than epoxy |
| Acid stain | $2–4/sq ft | Decorative workshop or showroom |
| Polished | $3–8/sq ft | High-end showroom |
DIY Considerations
A 400 sq ft garage floor is at the upper limit of a practical DIY pour. You'll need:
- Ready-mix delivery (5+ yards is too much for bagged mix)
- At least 2–3 helpers for pouring, screeding, and finishing
- Concrete finishing tools (screed board, bull float, hand trowel, edger)
- Saw-cut control joints within 4–6 hours of the pour
Potential savings: $500–1,500 on a standard 2-car floor. The risk is a poorly finished surface you'll look at every time you park. If you've never poured a slab before, start with a smaller shed base to practice the technique.