"Flatwork" is the trade's word for any horizontal slab that isn't a foundation — patios, walkways, sidewalks, equipment pads, and the like. It's the most approachable concrete project a homeowner can take on: smaller than a driveway, rarely permit-heavy, and the place most people first consider a decorative finish. This page covers costs in Salinas and Monterey County, the finish choices, what the crew actually does, and how to compare bids from licensed contractors.
Patio and flatwork costs in Salinas (September 2026)
| Item | Installed cost | Typical 400 sq ft job |
|---|---|---|
| Plain concrete patio / flatwork Broom or light trowel finish, 4-inch slab | $7–$12 per sq ft | $2,800–$4,800 |
| Walkway / sidewalk flatwork Same per-sq-ft band as a patio; small pours may carry a minimum | $7–$12 per sq ft | $2,800–$4,800 |
| Integral-color (no stamp) | $8–$15 per sq ft | $3,200–$6,000 |
| Exposed-aggregate finish | $10–$18 per sq ft | $4,000–$7,200 |
| Stamped / decorative concrete One pattern, one integral color, sealed | $12–$20 per sq ft | $4,800–$8,000 |
The plain range covers a 4-inch slab with a compacted gravel base, forms, control joints, and a broom finish, installed. A 400 sq ft patio — the common 20 × 20 ft backyard size — lands at $2,800–$4,800. Sources and the date checked are in our cost guide.
What moves a flatwork quote
-
Access
A backyard the truck can't reach means a pump or wheelbarrows — both add labor. Side-yard gate width is the first thing a good estimator checks.
-
Grading and demolition
Removing an old slab, pavers, or a deck, and cutting a level, well-drained base into a sloped yard, are the common prep costs.
-
Finish
Broom is the baseline. Integral color ($8–$15 per sq ft), exposed aggregate ($10–$18 per sq ft), and stamping ($12–$20 per sq ft) each add material and skilled hours.
-
Size and shape
Curves, steps, and multiple levels cost more per square foot than a rectangle. Very small pours carry a minimum charge.
-
Drainage
A patio must slope away from the house. If the yard slopes toward it, a drain or a raised slab edge is part of the job.
-
Anything attached or covered
A patio cover, a raised slab, or a retaining edge moves the project into permit territory and adds inspection time.
What's involved
- Layout. The patio is marked out, the slope away from the house is set (about a quarter inch per foot), and the crew checks where downspouts and hose bibs discharge.
- Excavation and base. Sod and soil come out to about 8 inches, then 4 inches of gravel go in and get compacted. On clay-heavy lots common in parts of the Salinas Valley, a thicker base is cheap insurance against heaving.
- Forms and reinforcement. Forms set the edges and height; wire mesh or rebar goes in where furniture, a spa, or foot traffic concentrate loads.
- Pour, screed, float, finish. The slab is placed, leveled, floated, and finished — broom for grip, or the decorative treatment you chose. Control joints are tooled or cut on a grid.
- Cure. Foot traffic after a day or two, furniture after a week, sealer (for decorative work) once the contractor confirms it's cured.
Finish options for outdoor slabs
- Broom finish — the standard. Slip-resistant, cheapest, and honest-looking. Recommended anywhere fog makes surfaces damp most mornings, which is most of Monterey County.
- Sand or light-broom finish — a finer texture for a cleaner look with most of the grip.
- Integral color — pigment mixed into the concrete, so the color goes all the way through and wear doesn't expose gray. $8–$15 per sq ft.
- Exposed aggregate — the top paste is washed off to reveal the stone. Durable, naturally slip-resistant, and hides dirt. $10–$18 per sq ft.
- Stamped — patterned and colored to read as stone, slate, or wood plank. $12–$20 per sq ft; needs re-sealing every 2–3 years. Full detail on the stamped concrete page.
Common flatwork projects around Salinas
- Backyard patio — the 400 sq ft rectangle off the back door is the single most common pour. Consider running it a few feet wider than the furniture footprint; the marginal square feet are the cheapest you'll ever add.
- Front walk and entry — a 3- to 4-foot-wide walk from driveway to door, often paired with a small landing. Sand or exposed-aggregate finishes are popular here because they read as "designed" without stamped-concrete money.
- Side-yard strip and trash-can pad — small, cheap per job but not per square foot; bundle it with a larger pour.
- Equipment and spa pads — a level, reinforced slab for a hot tub, AC condenser, shed, or generator. Tell the contractor the load; a filled spa needs more than a standard 4-inch pad.
- Sidewalk replacement — a lifted or broken public sidewalk panel in front of your home is often the property owner's responsibility in California cities, and because it sits in the right-of-way it usually involves the city. Ask your city's public works or building division before hiring.
- Pool deck — flatwork around an existing pool, almost always finished with broom, exposed aggregate, or a stamped pattern with a non-slip sealer additive.
Local notes for Salinas and the Peninsula
Mild temperatures mean patios here are usable most of the year, and the rare hard freeze means freeze-thaw damage isn't the concern it is inland. Two things are. First, moisture: the marine layer keeps surfaces damp, so slip resistance is a real safety consideration and drainage away from the house is non-negotiable. Second, salt air on the Peninsula — Monterey, Seaside, Marina — is hard on unsealed decorative finishes and on reinforcing steel if a slab ever cracks; a sealer schedule belongs in the plan for any colored or stamped patio near the bay.
Vetting a flatwork contractor
-
C-8 license, checked
Concrete flatwork is C-8 work. Look the number up on cslb.ca.gov — takes two minutes with our walkthrough.
-
A written quote with thickness and base
"400 sq ft patio" isn't a spec. You want slab thickness, base depth, reinforcement, finish, and joint layout on paper.
-
Slope stated
The quote or drawing should show which way the slab drains. Away from the house, always.
-
Deposit within legal limits
For home improvement contracts, California caps the down payment at $1,000 or 10% of the price, whichever is less. A demand for half up front is a red flag.
See how to verify a CSLB C-8 license and our roster of licensed contractors based in Salinas. Related: driveways · repairing an existing patio.