Metal Building Cost With Slab, by Size
Most cost pages online are written by people selling you the building. We are the structural engineers who stamp the foundation, so we have no reason to shade the concrete number or hide what the engineering costs.
Each page below breaks a size into four honest line items — building kit, concrete slab and footings, erection labour, and site prep — then explains what the foundation actually has to do at that span. Ranges are typical 2026 market costs, not quotes.
The Sizes People Ask About Most
| Building | Floor Area | Turnkey Range | Notes |
|---|---|---|---|
| 30x40 with slab | 1,200 SF | $26k–$56k | The classic shop |
| 30x50 with slab | 1,500 SF | $33k–$71k | Shop plus storage |
| 40x60 with slab | 2,400 SF | $48k–$101k | The commercial workhorse |
| 30x30 with slab | 900 SF | $23k–$47k | Compact and square |
| 40x40 with slab | 1,600 SF | $35k–$72k | Wide span, square footprint |
| 20x30 with slab | 600 SF | $16k–$34k | Entry-level footprint |
Other Common Footprints
| Building | Floor Area | Turnkey Range | Notes |
|---|---|---|---|
| 30x60 with slab | 1,800 SF | $40k–$77k | Long and narrow |
| 20x40 with slab | 800 SF | $21k–$42k | Narrow and deep |
| 40x50 with slab | 2,000 SF | $42k–$86k | Two thousand square feet |
| 20x20 with slab | 400 SF | $12k–$25k | Smallest permanent build |
| 40x80 with slab | 3,200 SF | $61k–$125k | Warehouse scale |
Building a size that is not listed? We engineer foundations for any footprint, in all 50 states. Talk to a PE →
The Line Item Almost Everyone Forgets
Your metal building manufacturer sends you a steel package, a set of reaction tables, and an anchor bolt plan. What they do not send is a foundation design — and no building department will issue a permit without foundation drawings stamped by a Professional Engineer licensed in your state.
That gap is where most first-time projects stall. The building is ordered, the slab is about to be poured, and someone realizes nobody has engineered what the slab is supposed to be. Then the search for an engineer begins — and many structural firms decline metal building work entirely.
We do nothing else. Published pricing, revisions always included, PE-stamped and permit-ready, licensed in all 50 states. Why your manufacturer does not include it →
Know Your Foundation Number
Send your reaction tables and anchor bolt plan. Fixed-price quote within the hour.