Concrete Garage Floor Cost Calculator
Concrete garage floor installation costs $3–8 per square foot. A standard 20×20 two-car garage floor runs $1,200–$3,200 installed. Enter your garage dimensions below for a full material and labor estimate.
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.
That's typically a professional pour. See volume ↓
4 short emails from Dave: what a fair quote should land at for your slab, the scope changes that swing it ±$500, and whether DIY is actually cheaper at your volume. Reply anytime — he'll review your real quote.
Includes 10% waste factor
For general step-by-step instructions, read our complete Garage Floor Thickness and Garage Floor Epoxy Guide.
Cost Breakdown: Standard 2-Car Garage (400 sq ft)
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.
| 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 Costs 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 (and What It Costs)
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 vs. Contractor: Garage Floor
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.