What a 30x40 or 40x60 Metal Shop With a Slab Really Costs in Spokane County (2026 Numbers)

"How much is a 40x60 shop?" is the most common question we get, whether it's for a pre-engineered metal building (PEMB, sometimes called a "red iron" building) or a pole building. Below is Raven's going installed rate for the Spokane area, what that number includes and leaves out, and the local Spokane County factors that push a quote up or down.

The quick answer: Raven's 2026 installed rate

Raven's going rate for an installed pre-engineered metal building in the Spokane area is about $60 to $75 per sq ft, not including electrical, plumbing or utility hookups, which are extra. Installed pole buildings run about the same in our market.

• 30x40 (1,200 sq ft): about $72,000 to $90,000 installed
• 40x60 (2,400 sq ft): about $144,000 to $180,000 installed
• Always extra: electrical, plumbing and utility hookups
• Varies by site: clearing, grading, gravel, the driveway to the building and how far power and water have to run

Why online kit prices look so much lower

National cost guides and kit sellers mostly publish the price of the steel package. HomeGuide lists prefab metal building kits at $10 to $25 per sq ft, and BuildingsGuide lists steel packages at $15 to $25 per sq ft (1, 2). That's the steel only. It leaves out freight, the engineered foundation and slab, erection, doors and insulation beyond the basic package, and site work. A kit priced for a low national snow load also isn't the building you'll permit on many Spokane County parcels (see snow load below). Compare complete installed bids, not kit prices.

The slab is part of the job

Slab prices from HomeGuide's 2026 concrete slab guide run $6 to $8 per sq ft for 4-inch and $8 to $10 per sq ft for 6-inch (3). On a 40x60, that's about $14,400 to $19,200 at 4 inches or $19,200 to $24,000 at 6 inches. A metal building's slab and footings have to be designed from the manufacturer's column reactions, so ask every bidder whether the slab, thickened edges and footings are included.

How much concrete is in a shop slab?

This is where you can check a bid yourself:

• A 4-inch slab takes about 1.23 cubic yards per 100 sq ft. A 6-inch slab takes about 1.85 (4).
• A 40x60 at 4 inches is about 29.5 yards before thickened edges. At 6 inches it's about 44 yards.
• A 30x40 at 4 inches is about 14.8 yards. At 6 inches it's about 22 yards.
• A metal building also needs thickened edges and column footings. One supplier estimates most 40x60 pours at 38–44 cubic yards, or four to five truckloads (5).

HomeGuide lists ready-mix at $119–$147 per cubic yard delivered within 20 miles, plus surcharges for short loads and weekend delivery (6). That makes the concrete alone for a 40x60 about $4,500–$6,500 at 38–44 yards. Base gravel, forming, rebar, vapor barrier, pumping, finishing and saw-cutting make up the rest of the slab price.

Spokane County factors that change your price

1. Snow load depends on where your lot is

Unincorporated Spokane County, the City of Spokane and Spokane Valley all use a 39 psf ground snow load with a 30 psf minimum roof snow load (7, 8). Some parts of the county are much higher. The County says some areas reach 150 psf, and parcel values are shown on the snow-load layer of its SCOUT map (9). Deer Park adopts 56–65 psf ground snow loads (10). A heavier snow load means heavier frames and purlins, which raises the kit price. Get your parcel's number before you compare kit prices, because an online quote built for 30 psf isn't the same building.

2. Frost depth sets your footing depth

The City and County's joint frost policy sets footings at 24 inches below finished grade. Detached residential accessory buildings may go to 18 inches, and frost-protected shallow foundations are allowed (11). Deer Park requires 36 inches (10). Lincoln County, which includes Davenport, requires 30 inches (12). Deeper footings mean more digging and more concrete.

3. Site work isn't in any of the ranges above

Every published range leaves out clearing, grading, drainage, the driveway to the building, and power or water. On rural lots in north Spokane County or Lincoln County, this can be a major line item. Walk the site with your contractor before you pick a building size.

Worked example: a 40x60 shop

At Raven's going rate of $60 to $75 per sq ft, a 40x60 (2,400 sq ft) shop runs about $144,000 to $180,000 installed. Electrical, plumbing and utility hookups are extra, and site work depends on your lot. If you heat the building, the Washington State Energy Code applies, and insulation becomes its own line item.

How to read a metal building quote

1. Check the design loads on the quote. They should match your parcel's snow load and the 110 mph wind speed in the local code tables (7).
2. Ask whether the slab is engineered for the anchor-bolt layout and column loads. A generic slab poured before the steel arrives is a common and expensive mistake.
3. Find out who handles excavation, gravel base and compaction.
4. Check for footing inspections. Spokane County requires one before footings are backfilled on pole buildings (13). Ask which inspections your project needs.
5. Get the door, insulation and gutter package in writing.

FAQ

How much does a 40x60 metal building with a slab cost in 2026? Raven's going installed rate in the Spokane area is about $60 to $75 per sq ft, so a 40x60 runs about $144,000 to $180,000. Electrical, plumbing and utility hookups are extra.

How much does a 30x40 metal shop cost? About $72,000 to $90,000 installed at Raven's going rate, with electrical, plumbing and utility hookups extra.

How many yards of concrete does a 40x60 slab need? About 29.5 yards at 4 inches before thickened edges. Most 40x60 metal-building pours run 38–44 yards (4, 5).

Why is my Spokane quote higher than an online kit price? Online kit prices are for the steel package only, often at lower snow loads than your parcel needs, and they leave out the slab, erection and site work. Spokane County roof snow loads start at 30 psf, and some parcels are much higher (9).

Get a real number for your site

Raven Buildings handles site prep, the foundation, erection and finish work, so you deal with one contractor. We aren't tied to one manufacturer. We price your pre-engineered building with the suppliers who can deliver fastest at your parcel's snow load, so you're not stuck waiting on a single factory's backlog. Call 509-350-2016 or request a free quote. See our steel building services, concrete flatwork and slabs, and pole buildings if post-frame fits your budget better.

Sources

• Installed pricing: Raven Buildings' current going rate for the Spokane area

1. HomeGuide, "How Much Does a Metal Building Cost? (2026)"
2. BuildingsGuide, "Metal Building Prices" Oct 2026
3. HomeGuide, "How Much Does a Concrete Slab Cost? (2026)"
4. MyConcreteCalc, "Concrete Slab Cost 2026"
5. SteelReady, "40x60 Metal Building With Slab: Cost Breakdown (2026)"
6. HomeGuide, "How Much Does Concrete Cost Per Yard? (2026)"
7. Spokane County BP-06 Residential Building Permits (design criteria table)
8. City of Spokane Valley, SVMC 24.40, Table R301.2(1)
9. Spokane County Building FAQ, "What is the basic minimum snow load"
10. City of Deer Park Municipal Code 15.04.010
11. City of Spokane / Spokane County Joint Policy BUILD-07 Official Frost Depth
12. Lincoln County, WA, Design Guidelines
13. Spokane County BP-32 Pole Buildings