Barndominium cost = concrete slab + steel shell + erection + interior finish; a 2,000 sq ft mid-range barndominium costs about $301,500 at US-average prices, or $150 per sq ft, with a range of $206,000 to $404,500. The shell is the cheap part. The interior is two thirds of the money.
How the barndominium cost is calculated
A barndominium is a steel (or post-frame) shell finished as a house, so the calculator prices the two halves separately:
- Slab: $5 to $20 per footprint sq ft, typical $12. General Steel gives $10 to $15 for a steel building and $5 to $8 for wood, BuildingsGuide $6 to $14, Metal Building Outlet $15 to $20.
- Steel shell package: $20 to $35 per footprint sq ft, typical $26.50 (BuildingsGuide $20 to $35, General Steel $20 to $31). Frame, roof and wall panels, materials only.
- Erection: $7 to $12 per sq ft, typical $9.50 (General Steel).
- Interior finish: $40 to $160 per finished sq ft, typical $100, including plumbing, electrical and HVAC (General Steel). The calculator splits it with NAHB's cost shares: 37% mechanical, 63% finishes.
Cost = footprint × (slab + shell + erection) + floor area × interior finish + grading + permits
Budget, mid-range and high-end pick the interior band: $40 to $100, $70 to $130 or $100 to $160 per sq ft before the state factors. The shell, slab and erection do not change with finish, because a steel kit is a steel kit.
Worked example: 2,000 sq ft, one story, mid-range
| Line | Typical |
|---|---|
| Excavation and grading | $3,300 |
| Permits | $2,000 |
| Concrete slab, 2,000 sq ft × $12 | $24,000 |
| Steel shell, 2,000 sq ft × $26.50 | $53,000 |
| Erection, 2,000 sq ft × $9.50 | $19,000 |
| Mechanical: plumbing, electrical, HVAC | $74,000 |
| Interior finishes | $126,000 |
| Total | $301,500 (range $206,000 to $404,500) |
Lines are rounded. Excavation and permits come from HomeAdvisor's steel home page ($1,300 to $5,300 and $500 to $2,000) and BuildingsGuide ($500 to $5,000). The $150 per sq ft result sits inside BuildingsGuide's $65 to $160 range for a finished barndominium (August 2026).
Cost by size
| Living area | Typical, mid-range | BuildingsGuide standard finish |
|---|---|---|
| 1,200 sq ft (30 x 40 ft) | $183,000 | $120,000 to $192,000 |
| 2,400 sq ft (40 x 60 ft) | $360,500 | $240,000 to $384,000 |
| 3,200 sq ft (40 x 80 ft) | $479,000 | $320,000 to $512,000 |
Finish level, a loft and rural services
At 2,000 sq ft the interior band moves the total from $241,500 (budget) through $301,500 (mid-range) to $361,500 (high-end). Choosing two stories puts half the floor area on the second level: the slab, shell and erection are priced on the ground-floor footprint, so the same 2,000 sq ft drops to $253,500. That understates a two-story steel frame, whose taller walls need heavier framing, so treat it as a floor.
Land without sewer or water needs a septic system ($8,986 to $16,350 from Fixr, $15,000 to $30,000 from BuildingsGuide) and a well ($2,500 to $25,000, Fixr; $8,000 to $15,000, BuildingsGuide). With both and a general contractor's fee (10% to 20%, HomeAdvisor) the 2,000 sq ft example reaches $381,000. Bringing power to a remote site starts around $15,000 and grows with distance (BuildingsGuide); it is not in the estimate.
What raises the price
- The interior. Kitchens, baths and finishes at $100 per sq ft of interior dwarf the $26.50 shell.
- Site and services. Utilities on a rural lot can cost more than the slab.
- Height and spans. Wider clear spans and taller walls raise the kit price.
- Contractor fee. Off by default, since many barndominiums are owner-managed. Switch it on to see a contractor's fee.
Permits and zoning
Rural parcels usually need a building permit, a septic permit and a driveway permit. Check zoning first: some counties do not treat a steel building as a dwelling. The kit maker's stamped drawings for your wind and snow load are what the permit office asks for.
What to work out next
Size the concrete slab, choose the metal roof panels, plan the insulation and check the service size with the electrical load calculator. To compare with a stick-built house see the house construction cost calculator; for an unfinished shell see the metal building cost calculator or the pole barn cost calculator. All estimates are in the project costs hub.
These are dated estimates from published national data adjusted for your state, not a quote.