These are the choices you make before a pour: the material, then the thickness, steel, mix and finish. The answers below are written for North Bay conditions, which means wet winters, dry summers, clay on the flats and slopes on the east side.
The dollar ranges on this page are national figures that HomeGuide published for 2026. They are not quotes from us. Sonoma County labor rates, material prices, truck access and the soil on your lot will push a real price above or below them. Last checked October 2026.
Concrete or asphalt for a driveway?
Concrete costs more up front and lasts longer with less upkeep. Asphalt is published at $5 to $12 or more per square foot, or $2,000 to $4,800 for a 20x20 area, against $6 to $15 for concrete. Asphalt softens in hot spells, needs resealing every few years and frays along unsupported edges. It suits long rural lanes where concrete would cost too much. Concrete handles heat, gives a cleaner edge and offers finishes asphalt cannot.
Poured concrete or pavers?
Pavers are published at $10 to $17 per square foot installed, or $3,800 to $6,800 for a 20x20 patio, so they sit above plain concrete and near stamped. Their strength on moving clay is that a settled area can be lifted and relaid, and a utility repair leaves no scar. Their weakness is weeds, ants and sand loss in the joints, and edges that creep. Poured concrete is one piece, easier to keep clean and cheaper in a plain finish.
How thick should a concrete driveway be?
Four inches is the usual minimum for cars and light pickups, and 5 to 6 inches is better where an RV, a loaded work truck or a delivery truck will park. Many builders thicken the edges and the apron. The compacted rock base under the slab matters as much as the thickness, especially on clay.
Do I need rebar or wire mesh?
For a driveway here, yes, we recommend one or the other. Rebar on a grid, held up on supports so it sits in the middle of the slab, is the stronger option. Wire mesh works for lighter slabs if it is kept off the ground during the pour. Steel earns its place on expansive clay and in earthquake country, because it keeps cracked sections locked together and level.
What PSI concrete do I need?
Residential flatwork is commonly ordered at 2,500 to 3,000 PSI, and many contractors use 3,000 to 4,000 PSI for driveways. Because hard freezes are rare in Santa Rosa, the air-entrained mixes used in cold states are usually not required. Structural footings and slabs follow the PSI stated on the engineer's drawings.
Is stamped concrete worth it?
Stamped concrete is worth it when appearance matters and you will keep up with resealing. It gives a stone or brick look in one slab for less than most natural stone. The trade-offs are a higher price than plain, sealer upkeep every few years, slipperiness if sealed too glossy, and repairs that are hard to blend. For a utility area, a broom finish is the better buy.
Should I seal my new concrete, when, and how often after that?
Sealing is optional for plain broom-finished concrete here and necessary for stamped or colored work. Without freeze-thaw cycles, sealer mainly guards against stains, moss and water soaking through to the clay. Most sealers go on after the slab has cured about 28 days, on a dry day. Cleaning and sealing is published at $1 to $3 per square foot, or $575 to $1,700 for a two-car driveway.
As for how often: about every 2 to 3 years for a film-forming sealer on stamped or colored concrete in full sun, and every 5 years or longer for a penetrating sealer on plain concrete. A simple test: if water no longer beads and the surface darkens straight away, it is time.
Broom finish or smooth finish? What about a steep driveway?
Outdoors, choose a broom finish. Its fine ridges give grip on wet winter mornings. A smooth steel-trowel finish belongs in garages and indoor floors, where it is easy to sweep. Exposed aggregate and sand-wash finishes also give good footing and are popular around Sonoma County.
On a steep driveway, use a heavy broom finish pulled across the slope, or grooves pressed in across it. Hillside drives in Fountaingrove, Bennett Valley and Rincon Valley get slick with rain and fallen leaves. Avoid smooth trowel finishes and glossy sealers on any grade.
What does a hot tub pad need?
A hot tub pad needs to be level and strong. A filled spa with people in it can weigh several thousand pounds. A reinforced slab at least 4 inches thick on compacted rock is the usual minimum, and many spa makers ask for more, so check the manual. Plan the electrical run, the drain direction and access to the equipment panel before the pour.
I want a shop slab for a vehicle lift or heavy equipment. What changes?
A lift puts very large loads on small anchor points. Lift manufacturers publish a minimum slab thickness and concrete strength, often 4 to 6 inches at 3,000 PSI or more, and some require thickened footings under the posts. Get the model's requirements before the slab is designed. A shop floor in an enclosed building also needs a vapor barrier and usually a permit.
Do I need gravel under a slab, or a vapor barrier?
In most of Santa Rosa, yes. A layer of compacted crushed rock under the slab spreads the load, drains water and separates the concrete from clay that swells and shrinks. Four inches is common, and more where the native soil is poor. Pouring directly on clay or on loose fill is a leading reason slabs crack and settle.
A vapor barrier is needed under any slab that will be enclosed or covered with flooring. It is a plastic sheet placed under the slab to stop ground moisture rising through it. Winter groundwater on the Santa Rosa Plain makes this important for garages converted to living space, additions and shops. Driveways, walks and open patios do not need one.
My pad has to take delivery trucks. How should it be built?
Tell us the heaviest vehicle and how often it comes. A pad for delivery trucks, a loaded trailer or a rubbish truck is typically 6 inches or thicker, with rebar, a deeper rock base and closer joints. Turning areas and the spot where a truck stops take the most stress. A slab built for cars will break up under regular truck traffic.
My pool deck is worn. Resurface, pavers or new concrete?
If the pool deck is solid and only looks tired, resurfacing is the economical choice, published at $3 to $6 per square foot. A textured coating also stays cooler and gives grip. If panels have sunk or tilted toward the pool, lift or replace those first. Pavers suit decks where pipes may need access later. New poured concrete makes sense when the whole deck is cracked or you are changing its shape.
A patio is going against the house. What goes between the two?
An isolation joint, also called an expansion joint, goes between the patio and the house. It is a strip of compressible material that lets the patio move without pushing on the foundation. The patio must also slope away from the wall and sit below the stucco weep screed or siding, so water and termites have no easy path in.
The real number for your property comes from a free on-site estimate with measurements and a written quote. Call (707) 385-5837, or text a photo of the area.