Concrete Contractor in Colbert, WA: Driveways, Patios, Shop Slabs & Foundations

Concrete contractor in Colbert, WA, pouring driveways, patios, shop slabs and foundations to Spokane County's 24-inch frost depth. Raven Buildings brings the crew that pours our steel building foundations to Colbert and the north Spokane County acreage along the Little Spokane River and toward Green Bluff, with air-entrained mixes, compacted base and footings set below the frost line.

Concrete work we do around Colbert

• Driveways and approaches: new driveways, replacements, widening and the approach where your driveway meets a County road
• Patios and walkways: broom-finish and stamped patios, steps and sidewalks
• Shop and barn slabs: floors for metal buildings, pole barns and garages, thickened where lifts, trucks or tractors will sit
• Foundations and footings: for shops, garages, additions and pre-engineered metal buildings
• Equipment and RV pads: parking for motorhomes, trailers, boats and farm equipment

Which office?

Colbert isn't an incorporated city, so most parcels there fall under Spokane County.

• Building permits: Spokane County Building and Planning, at 1026 W. Broadway in Spokane (509-477-3675), handles footings, foundations and shop slabs that are part of a permitted building
• Road approaches: Spokane County requires an approach permit from its Division of Engineering and Roads to connect a driveway to any County road, and widening an existing approach needs a permit and a County inspection too
• How we check: we pull your parcel number before we quote, so the design and the paperwork go to the right office

Rural driveway rules that apply on most Colbert acreage

Spokane County's rural residential approach packet and its private driveway handout (BP-14) set the numbers we build to:

• Approach width: the fire district asks for an approach at least 20 feet wide so an emergency vehicle can get in
• Approach grade: in rural areas the approach within the right-of-way can't rise or fall more than 2 percent, and driveway grades can't exceed 10 percent within 10 feet of the County road right-of-way
• Sight distance: the County's rule of thumb is 10 feet of sight distance in each direction for every mile per hour of posted speed, so a 45 mph road needs 450 feet
• Long private driveways: a 12-foot clear, all-weather travel way, a turnout about every 400 feet, and a turnaround for driveways over 150 feet long
• Culverts: cross pipes where a private driveway meets a fire apparatus access road are at least 12 inches in diameter

For the slab itself, our driveway thickness guide covers depth and base.

Spokane County's numbers for concrete

• Frost depth: 24 inches to the bottom of the footing, under the City of Spokane and Spokane County joint frost depth policy. Our frost depth guide explains why it matters
• Snow load: the County's residential packet lists a 39 psf ground snow load, and its SCOUT map shows parcel-specific loads. Parcels north of Spokane can run higher, and that drives the column loads a shop foundation has to carry

The right mix for freeze-thaw

Washington's residential code (IRC Table R402.2) sets minimum concrete strengths by weathering potential. Where weathering is severe:

• Garage floors, porches, carport slabs and exposed steps: at least 3,500 psi, air-entrained
• Air content: 5 to 7 percent total air
• Foundation walls and other vertical concrete exposed to the weather: at least 3,000 psi, air-entrained
• Deicers: for driveways and flatwork that see deicing chemicals, the residential concrete code ACI 332-20 calls for 4,500 psi with a maximum water-to-cement ratio of 0.45

We order mixes to match and don't add water on site. Our concrete psi guide, rebar guide and control joint spacing guide go deeper.

What a concrete patio costs

Raven's current pricing for a concrete patio, including site prep and the pour:

• Broom finish: about $12 to $20 per sq ft
• Stamped: about $18 to $30 per sq ft
• What moves the price: the size of the patio and whether a pump truck is needed to reach it

Driveways, shop slabs, equipment pads and foundations are priced per project after a site visit, since base work, thickness, tear-out and access change the cost.

Slab and building from one contractor

Putting up a shop or barn? We can pour the footings and floor and erect the building too, with anchor bolts set to the manufacturer's drawings. See our page for metal buildings in Colbert, our PEMB foundation guide and our shop slab thickness guide.

Why Colbert owners call Raven

• Concrete is our core trade: our own crew forms, pours and finishes. See our concrete flatwork services
• We build to the County's numbers: frost depth, rural approach standards and your parcel's snow load
• We work all around you: we also pour concrete in Mead, Chattaroy, Elk and Deer Park

Stamped patios too

Want a patio with the look of stone or slate? See our stamped concrete contractor page for Mead, which serves the Colbert side of the valley too.

Get a Colbert concrete quote

Call 509-350-2016 or request a free quote with your project, rough size and address or parcel number.

Sources

• Patio pricing: Raven Buildings' current rates
• Spokane County Rural Residential Approaches (E-3)
• Spokane County BP-14, Private Driveways
• Spokane County BP-06, Residential Building Permits (design criteria)
• Spokane County SCOUT map, Snow Loads layer
• City of Spokane / Spokane County Joint Policy BUILD-07, Official Frost Depth (PDF)
• 2021 Washington Residential Code, Chapter 4 Foundations (Table R402.2)
• ACI 332-20, Code Requirements for Residential Concrete (preview)