Building a Steel-Frame (PEMB) Barndominium in Spokane County: 12-Step Pre-Build Checklist With Real Fees

"Barndominium Spokane WA" keeps climbing in local searches, and most people asking start with the building. Experienced builders start with the land: septic, water, snow load and access decide what you can build and what it costs. This checklist puts the steps in order with real 2026 fees and code numbers for Spokane County.

A barndominium is a house as far as the code is concerned. It's permitted and inspected as a single-family dwelling, with the same energy code, egress and inspections as any other home.

What a barndominium costs (published 2026 ranges)

• Finished barndominium: Published range: $65–$160 per sq ft ($130,000–$320,000 for 2,000 sq ft), land not included; Source: HomeGuide (1)
• Kit materials only: Published range: $20–$35 per sq ft; Source: HomeGuide (1)
• Installed steel shell, Raven's going rate in the Spokane area: about $60–$75 per sq ft, with electrical, plumbing and utility hookups extra. HomeGuide's national kit-plus-assembly figure ($30–$50 per sq ft) runs lower than local installed pricing (1)
• Slab foundation: Published range: $6–$14 per sq ft; Source: HomeGuide (1)
• Bringing utilities, clearing and road access to a rural lot: Published range: up to $75,000; Source: HomeGuide (1)

That range is national. A red-iron (PEMB) frame typically costs more than a post-frame barndo but gives you longer clear spans for a big shop bay. Your snow load (step 4) moves the steel price, too. For shop-only numbers, see what a 30x40 or 40x60 metal shop with a slab really costs.

The 12-step checklist

Land and utilities

1. Confirm your jurisdiction. Unincorporated land (Mead, Colbert, Elk, Nine Mile Falls) goes through Spokane County Building & Planning. Lots inside Deer Park, Cheney, Airway Heights or Liberty Lake go through that city (2).

2. Septic feasibility (SRHD). Septic in Spokane County is permitted by the Spokane Regional Health District, not the building department. A licensed designer does the site evaluation and test holes, then SRHD reviews and visits the site. 2026 fees for a complete new residential system are a $1,000 application fee plus an $890 permit fee. If the building department requires a water adequacy review, that's $180 more. Reinspections are $360 (3). Test holes must be dug within the previous 30 days, and the system has to stay uncovered until SRHD approves it (3).

3. Water supply. A home on a private well needs proof of adequate water before a building permit is issued (RCW 19.27, through SRHD's water adequacy review) (3). Ecology's permit-exempt well rules allow domestic use up to 5,000 gallons per day. Before drilling, a Notice of Intent and construction fee have to be filed with Ecology. Licensed drillers usually handle this, and Ecology's homeowner well guide explains the process. Confirm the current fee with your driller (4).

4. Snow load for your parcel. Most of Spokane County uses a 39 psf ground snow load (30 psf roof minimum), but the County says some areas reach 150 psf. Look up your parcel on the SCOUT snow-load layer (5). Deer Park adopts 56–65 psf (6). Give your steel supplier this number before you compare quotes.

5. Frost depth and soils. Footings go 24 inches below grade in Spokane County (7). Deer Park uses 36 inches (6). Lincoln County, if you're building out toward Davenport, uses 30 inches and a 50 psf ground snow load (8).

6. Access and driveway. Fire apparatus access, culverts and approach permits all come up on rural lots. Budget the driveway with your site work.

Design

7. Choose the frame: red iron (PEMB) vs post-frame. PEMB gives wide clear spans and a factory-engineered frame. Post-frame usually costs less up front for smaller buildings. Either way, the house part has to meet the residential code and the Washington State Energy Code.

8. Get the anchor-bolt and reactions package. With a PEMB, the supplier provides column reactions and the anchor-bolt plan, and your engineer designs the foundation. See our steel building services.

9. Plan the living area and shop as separate zones. Fire separation, insulation strategy and HVAC sizing are different for a heated home than for a shop bay. Decide early.

10. Plan the plumbing under the slab before the pour. Every drain, floor drain and utility sleeve has to be set before the concrete goes in. Plan for an in-floor heat manifold now if you might want one later.

Permits and build

11. Submit the building permit with the SRHD septic approval and the water adequacy documents. The county won't issue a home permit without them (3).

12. Schedule inspections: footing, under-slab plumbing, framing, insulation and final. Don't cover the septic until both SRHD and the designer approve it (3).

Money checklist (fees in this post)

• SRHD septic application + permit (residential): $1,890
• SRHD water adequacy review (if required): $180
• Ecology well Notice of Intent: current fee, confirm with driller/Ecology
• Building permit (national range): $500–$2,000 (HomeGuide) (1)

FAQ

How much does a barndominium cost in Spokane? HomeGuide's national 2026 range is $65–$160 per sq ft finished, not including land. Local snow load, site work and finish level decide where your project falls (1).

Do I need septic approval before a building permit? Yes. SRHD handles septic permitting, and the building permit needs that approval plus proof of water (3).

Can I build a barndominium in Deer Park? Yes, through the City of Deer Park's building department for lots inside city limits. Expect a 56–65 psf ground snow load and 36-inch frost depth (6).

Is a red iron barndominium better than a pole barn barndo? PEMB is better for wide clear spans and big shop bays. Post-frame often costs less for smaller footprints. Get both priced at your actual snow load.

Start with a site walk

Raven Buildings handles dirt work, foundations, steel erection and the house build, and we're manufacturer-neutral: we source your PEMB from whichever supplier can deliver fastest for your design. Call 509-350-2016 or request a quote. See steel buildings and custom home builds.

Sources

1. HomeGuide, "How Much Does a Barndominium Cost to Build? (2026)"
2. Spokane County Building FAQ (jurisdiction)
3. Spokane Regional Health District, "On-Site Sewage System Permitting Process" (fees 2026, modified Dec 2025)
4. Washington State Department of Ecology, Groundwater permit exemption; Homeowner's guide to well construction
5. Spokane County Building FAQ / SCOUT snow-load layer
6. City of Deer Park Municipal Code 15.04.010
7. City of Spokane / Spokane County Joint Policy BUILD-07 Frost Depth
8. Lincoln County, WA, Design Guidelines