Cost guide · Updated September 2026 · 9 min read
Steel Building Cost per Square Foot by Size (2026)
What a steel building costs per square foot depends first on its size: a bigger footprint spreads the end walls, connections and engineering over more floor area, so the rate falls as the building grows. The table below gives structure-only budget ranges for ten footprints from 30×40 to 300×500 ft, updated September 2026, followed by what those ranges leave out and how to turn one into a quote.
Budget ranges by size: structure-only kit
| Size (ft) | Area | Budget range | Per sq ft |
|---|---|---|---|
| 30×40 | 1,200 sq ft | $12,000–$28,000 USD | $10–$23 USD/sq ft |
| 40×60 | 2,400 sq ft | $20,000–$48,000 USD | $8–$20 USD/sq ft |
| 50×100 | 5,000 sq ft | $40,000–$90,000 USD | $8–$18 USD/sq ft |
| 100×100 | 10,000 sq ft | $80,000–$180,000 USD | $8–$18 USD/sq ft |
| 100×150 | 15,000 sq ft | $110,000–$250,000 USD | $7–$17 USD/sq ft |
| 100×200 | 20,000 sq ft | $140,000–$320,000 USD | $7–$16 USD/sq ft |
| 100×300 | 30,000 sq ft | $200,000–$450,000 USD | $7–$15 USD/sq ft |
| 200×400 | 80,000 sq ft | $640,000–$1,400,000 USD | $8–$18 USD/sq ft |
| 200×600 | 120,000 sq ft | $900,000–$2,000,000 USD | $8–$17 USD/sq ft |
| 300×500 | 150,000 sq ft | $1,100,000–$2,500,000 USD | $7–$17 USD/sq ft |
How steel building pricing works
Four things set the price: the size, the tonnage of steel the design loads call for, the cladding and the accessories. Size moves the per-square-foot rate most, until longer spans start to need heavier frames. The ranges above are structure-only: primary and secondary framing, roof and wall cladding, trim and hardware. The foundation, site work, erection, permits, MEP, freight and import duties are not in them.
Small buildings: 30×40 to 50×100
Shops, storage and agricultural buildings. At this size the end walls, doors and trim are a large share of the steel, which is why the per-square-foot range is widest here. These footprints ship as standard kits: the kit size matrix gives the eave options, frame type, planning steel weight and flatbed count of each.
Mid-size buildings: 100×100 to 100×300
Warehouses, workshops and light manufacturing. These buildings are engineered for their site: the wind, snow and seismic loads of the address, and any crane or mezzanine, set the frame sizes. Clear-span frames keep the floor free of columns; where the layout allows interior columns, they bring the tonnage down.
Large buildings: 200×400 and up
Distribution centers and plants. At this scale the building is always engineered per project and often carries cranes, mezzanines or dock equipment, so the quote is built from your layout. Use the table to budget, then send the layout for a figure built from it.
Standard kit sizes you can quote directly
Eight footprints have their own row in the kit size matrix, with eave options, frame, planning steel weight and flatbeds: 30×40, 40×60, 40×80, 50×100, 60×120, 80×100, 100×100 and 100×200. The matrix shows no prices: every kit is quoted per project, and the ranges on this page are the budget reference.
What moves the price inside the range
| Factor | Effect | Why |
|---|---|---|
| Design loads | High | Wind, snow and seismic loads come from your site address; coastal and high-snow sites need heavier frames, bracing and anchorage. |
| Eave height | Medium | Taller walls need heavier columns and more bracing. |
| Steel grade | Medium | A572 Grade 50 costs more per ton than A36 but allows lighter sections. |
| Cladding and insulation | Medium to high | Insulated sandwich panels cost more than single-skin sheeting. |
| Doors and openings | Low to medium | Each roll-up door adds a framed opening as well as the door. |
| Cranes and mezzanines | High | Crane runways and mezzanine loads change the frames and the foundations. |
| Delivery | Medium | Freight is not in the ranges; the distance from Hermosillo and the delivery term set it. |
Landed cost checklist
The kit is one line of the budget. Before you compare it with a US supplier's delivered price, add up:
- The structure-only kit, from the table above.
- Freight: your carrier from our plant or from the border, or our DDP price to your site (steel building delivery terms).
- Import duty. For pickup at the plant or delivery at the border, your customs broker confirms the duty for your HTS classification before you order; with DDP, duty is part of our delivered price.
- The foundation and site work, designed by your foundation engineer from our anchor-bolt plan and reactions.
- Erection by your own crew or a local erector.
- The building permit, and your engineer of record's review and stamp.
- Doors, insulation and accessories beyond the base kit, where your quote does not include them.
Made in Mexico or imported from China?
A building from our Hermosillo plant is trucked north: no ocean leg, no port drayage and no container minimum, and the plant works on Arizona time. If you already hold an overseas supplier's drawings, we can re-engineer the same geometry to your site's loads and quote it side by side; the prefab steel warehouses page explains how.
Building in Mexico instead?
A plant or warehouse erected in Sonora is priced installed, foundation included, so it is a different number. Turnkey budget ranges for Sonora are on the prefabricated steel warehouses page; manufacture in Mexico explains how we build turnkey for manufacturers, and the nearshoring warehouse guide compares leasing with owning.
Questions
How much does a 100×100 steel building cost?
A 100×100 ft steel building (10,000 sq ft) budgets at $80,000–$180,000 for the structure-only kit, or $8–$18 per sq ft, in the September 2026 budget ranges. Foundation, erection, freight and import duties are extra.
How much does a 30×40 steel building cost?
A 30×40 ft steel building (1,200 sq ft) budgets at $12,000–$28,000 for the structure-only kit, or $10–$23 per sq ft, in the September 2026 budget ranges. Foundation, erection, freight and import duties are extra.
How much does a 40×60 steel building cost?
A 40×60 ft steel building (2,400 sq ft) budgets at $20,000–$48,000 for the structure-only kit, or $8–$20 per sq ft, in the September 2026 budget ranges. Foundation, erection, freight and import duties are extra.
How much does a 50×100 steel building cost?
A 50×100 ft steel building (5,000 sq ft) budgets at $40,000–$90,000 for the structure-only kit, or $8–$18 per sq ft, in the September 2026 budget ranges. Foundation, erection, freight and import duties are extra.
How much does a 200×400 steel building cost?
A 200×400 ft steel building (80,000 sq ft) budgets at $640,000–$1,400,000 for the structure-only kit, or $8–$18 per sq ft, in the September 2026 budget ranges. Foundation, erection, freight and import duties are extra.
What does a structure-only price include?
The primary frames, the secondary framing (purlins, girts and bracing), roof and wall sheeting, trim and fasteners. It does not include the foundation, site work, erection, permits, mechanical, electrical and plumbing, freight or import duties.
What else do I pay for besides the kit?
Freight from our plant or the border (or our DDP price to your site), import duty as your customs broker confirms it, the foundation, erection by your crew or a local erector, the building permit, and your engineer of record's review and stamp.