Concrete Slab Cost in California
Quick answer: a 4-inch concrete slab in California costs about $8.00 – $15.00 per sq ft installed, 25% above the U.S. average. A 12 × 12 ft patio runs about $1,330 – $2,290, a 24 × 24 ft garage floor $5,120 – $8,900 and a 20 × 40 ft driveway $7,030 – $12,260.
California has the highest concrete prices of any mainland state in our model, and the Bay Area runs higher still. Labor and contractor overhead drive the gap; a bag of mix or a sheet of wire mesh costs about the same here as anywhere, so doing the work yourself saves a bigger share in California than in most states.
Concrete Prices in California by Project
| Project | California installed | Per sq ft | U.S. average | DIY materials |
|---|---|---|---|---|
| 12 × 12 ft patio | $1,330 – $2,290 | $9.00 – $16.00 | $1,130 – $1,970 | $590 – $820 |
| 10 × 12 ft shed slab | $1,140 – $1,940 | $9.00 – $16.50 | $970 – $1,680 | $520 – $710 |
| 20 × 20 ft slab | $3,360 – $5,940 | $8.00 – $15.00 | $2,810 – $5,060 | $1,310 – $1,950 |
| 24 × 24 ft garage floor (5 in) | $5,120 – $8,900 | $8.50 – $15.50 | $4,250 – $7,540 | $2,160 – $3,090 |
| 20 × 40 ft driveway (5 in) | $7,030 – $12,260 | $8.50 – $15.50 | $5,820 – $10,380 | $2,930 – $4,210 |
| 30 × 40 ft shop floor (6 in) | $11,160 – $19,160 | $9.00 – $16.00 | $9,190 – $16,140 | $5,010 – $6,930 |
4-inch slabs unless shown. Installed: forms, broom finish and labor, up to vapor barrier, #4 rebar and contractor overhead and profit. DIY: concrete (ready-mix or 80-lb bags, whichever is cheaper) and forms, up to vapor barrier and rebar. Excavation, gravel base and permits are extra.
Metro Areas
Prices in the biggest metro areas differ from the state as a whole, mainly because of labor costs.
| Area | Factor | Slab per sq ft | 12 × 12 patio | 24 × 24 garage | 20 × 40 driveway |
|---|---|---|---|---|---|
| California (statewide) | 1.25 | $8.00 – $15.00 | $1,330 – $2,290 | $5,120 – $8,900 | $7,030 – $12,260 |
| San Francisco Bay Area, CA | 1.35 | $8.50 – $16.00 | $1,410 – $2,420 | $5,460 – $9,440 | $7,510 – $13,020 |
| Los Angeles metro, CA | 1.20 | $8.00 – $14.50 | $1,290 – $2,230 | $4,940 – $8,630 | $6,790 – $11,890 |
Building a Slab in California
| Weathering (IRC) | Negligible on the coast and in the valleys; severe in the Sierra Nevada and other mountain areas. |
|---|---|
| Concrete strength | 3,000 PSI for patios and driveways in most of the state; 3,500 PSI air-entrained above the snow line. 3,000 PSI ready-mix runs about $169 – $200 per yd³ here. |
| Frost depth | About 12 in or less in coastal and valley areas. Mountain counties set deeper frost depths, often 18 to 30 in or more. |
| Soil | Expansive clay in parts of the Bay Area, the Sacramento Valley and Southern California. A soils report may call for a thicker base, moisture conditioning or heavier rebar. |
| Pouring season | Year-round on the coast. In the Central Valley and the inland deserts, summer pours should start at first light to stay inside hot-weather limits. |
- Many California cities limit new paved area to control stormwater runoff. A large new patio or driveway can trigger a drainage review, or a requirement for permeable paving in part of it; ask before you design.
- Driveway work at the street (apron, curb cut or sidewalk) needs a city encroachment permit, separate from any building permit for the slab.
- Because labor is the expensive part here, small slabs are where DIY pays most: the DIY column in the table below is a smaller share of the installed price than the national average.
Frost depths and permit rules are set by your city or county; check with the local building department before you dig. A permit for a small residential slab or driveway typically costs about $50 – $350.
Price Your Own Slab in California
The calculator below starts at California prices. Enter your size, thickness, finish and reinforcement; if you have local prices for ready-mix or labor, type them over the defaults.
Concrete Slab Cost & Volume Estimator
Precision multi-layer project budgeting: Materials, Sub-Base, Reinforcement, Labor & Equipment
Picking a location sets the ready-mix, excavation and labor rates below to that area's typical level. You can still type your own local prices afterwards. Slab prices by state.
Closer spacing uses more steel and raises the rebar cost.
Not charged when bagged concrete is selected.
A scaled plan of your slab: rebar grid at the spacing you chose, support chairs about every 3 to 4 ft, and the recommended control-joint saw cuts (2.5 times the thickness in inches, in feet, capped at 15 ft). It redraws as you change the inputs.
| Scope Item / Material Description | Amount |
|---|
Enter the total your contractor quoted. We compare it with a benchmark for the same slab and scope you set in the calculator: materials at your entered prices plus labor at the regional standard rate, before any overhead or profit. Make sure the calculator scope (base, rebar, finish, pump, demolition) matches what the bid includes.
Optional: enter the bid's line items to see where the markup sits
Enter the forecast for pour day. The check follows ACI 306R (cold weather) and ACI 305R (hot weather) and estimates the surface evaporation rate that drives plastic shrinkage cracking.
How These Prices Are Worked Out
These are modelled prices, not quotes collected from California contractors. Each project is priced with the same line items as the slab cost calculator at national unit prices, then California's location factor of 1.25 is applied to ready-mix concrete and labor, as the calculator does when you pick California. Bagged concrete, forms, rebar and the delivery fee stay at national prices. The factors are approximate, set by our editors to reflect typical construction cost differences between states; the full method is in the 2026 concrete price report.
Have a quote already? Check it with the concrete quote checker, which uses the same factors.
California Concrete Questions
About $8.00 to $15.00 per sq ft installed for a 4-inch slab with forms, a broom finish and labor, 25% above the national average. A 12 x 12 ft patio runs about $1,330 to $2,290 and a 24 x 24 ft garage floor (5 in) about $5,120 to $8,900. Excavation, gravel and permits are extra.
A 20 x 40 ft driveway, 5 inches thick with rebar and a broom finish, costs about $7,030 to $12,260 installed in California ($8.50 to $15.50 per sq ft). Removing an old driveway and the street apron are extra.
About $169 to $200 per cubic yard for 3,000 PSI ready-mix before delivery fees, and about $179 to $225 for 4,000 PSI. Small loads add a short-load fee of $80 to $200 or more.
In the San Francisco Bay Area area our model puts 3,000 PSI ready-mix at about $182 to $216 per cubic yard before delivery, and a 4-inch slab at about $8.50 to $16.00 per sq ft installed, 35% above the U.S. average. A 12 x 12 ft patio runs about $1,410 to $2,420 and a 20 x 40 ft driveway about $7,510 to $13,020.
In the Los Angeles area our model puts 3,000 PSI ready-mix at about $162 to $192 per cubic yard before delivery, and a 4-inch slab at about $8.00 to $14.50 per sq ft installed, 20% above the U.S. average. A 12 x 12 ft patio runs about $1,290 to $2,230 and a 20 x 40 ft driveway about $6,790 to $11,890.
Mostly labor and overhead: finishers' wages, insurance and business costs are higher, and ready-mix costs more around the big metros. In our model California runs 25% above the national average, and the Bay Area 35% above. Bagged concrete, mesh and rebar cost close to national prices, so DIY saves a larger share here.
They are the site's national cost model with California's location factor (1.25) applied to ready-mix and labor, the same thing the calculator does when you pick California. They are modelled estimates, not prices collected from California contractors; get local quotes before you build.