Steel building prices by size

Each size below is priced by the same model as the designer above: a tube-steel building at the dealer’s list price, delivered and installed on your level site, with the doors a dealer would put on it. The price per square foot is the installed range divided by the floor; the slab has its own column. Prices were read Oct 30, 2026, and each range holds the middle 80% of what sellers publish for a comparable building. Pick a size to open it in the designer.

Size	Cars inside	Price, installed	Per sq ft	4 in slab	Concrete
20 × 20 ft10 ft walls, two 8 × 8 ft roll-ups, one walk door	2 cars	$8,600–$23,700	$22–$59	$1,600–$3,200	7.5 cu yd
24 × 30 ft10 ft walls, two 9 × 8 ft roll-ups, one walk door	2 cars	$11,300–$31,200	$16–$43	$2,900–$5,800	13 cu yd
30 × 40 ft12 ft walls, three 10 × 10 ft roll-ups, one walk door	3 cars	$17,600–$48,400	$15–$40	$4,800–$9,600	20 cu yd
30 × 50 ft12 ft walls, three 10 × 10 ft roll-ups, one walk door	3 cars	$20,000–$55,000	$13–$37	$6,000–$12,000	25 cu yd
40 × 50 ft12 ft walls, two 12 × 12 ft roll-ups, one walk door	4 cars	$22,300–$61,300	$11–$31	$8,000–$16,000	32 cu yd
40 × 60 ft14 ft walls, two 12 × 12 ft roll-ups, one walk door	6 cars	$26,700–$73,400	$11–$31	$9,600–$19,200	38 cu yd
50 × 100 ft16 ft walls, two 14 × 14 ft roll-ups, two walk doors	10 cars	$48,100–$132,400	$10–$26	$20,000–$40,000	76 cu yd

These are ranges of published list prices, not quotes. Delivery distance, the steel gauge, permits and options such as insulation change what a dealer quotes.

Cost per square foot

The price per square foot falls as the building grows. A 20 × 20 ft building runs $22–$59 per square foot installed; a 40 × 60 ft building runs $11–$31, and a 50 × 100 ft building $10–$26. The roof grows with the floor, but the walls grow only with the edge, and the doors are a count, not an area: on a bigger floor they weigh less per foot.

So a per-square-foot price taken from one size does not carry to another. Price the size you will build: the designer works it out for any width, length and wall height, with your doors.

What moves the price

For one footprint, the model behind the range prices the roof, the walls and the doors. On a 30 × 40 ft building with 12 ft walls and three 10 × 10 ft roll-ups, one walk door:

Each roll-up door adds $1,400–$3,900 to the range.
Each walk door adds $600–$1,600.
Walls 2 ft taller add $1,100–$2,900: every foot puts steel on all four walls.

The table keeps three roll-ups on the 40 ft side wall and changes only the walls; a wall too low for the doors gets the tallest door it takes. Pick a height to open it in the designer.

Wall height	Peak	Price, installed	With a 4 in slab
10 ft wallsthree 9 × 8 ft roll-ups, one walk door	13 ft 9 in	$16,500–$45,500	$21,300–$55,100
12 ft wallsthree 10 × 10 ft roll-ups, one walk door	15 ft 9 in	$17,600–$48,400	$22,400–$58,000
14 ft wallsthree 10 × 10 ft roll-ups, one walk door	17 ft 9 in	$18,600–$51,300	$23,400–$60,900
16 ft wallsthree 10 × 10 ft roll-ups, one walk door	19 ft 9 in	$19,700–$54,200	$24,500–$63,800

Kit, installed or post frame

The same 30 × 40 ft footprint is sold three ways, and each price leaves out different work:

Tube steel, installed: $17,600–$48,400. Delivered and installed on a level site. Slab and site prep extra.
Steel kit: $15,700–$29,400. Kit only: frame, panels, trim and stamped drawings. Delivery, erection, doors and slab extra.
Post frame: $18,500–$33,800. Materials kit, usually delivered. Labor and slab extra.

A kit can look cheaper than the installed building and cost more once the crew, the doors and the freight are added. Get those prices before you compare, or see metal building kits by size.

Slab cost and concrete

The slab is not in the building’s price. Under a 30 × 40 ft building a 4 in slab takes 20 cu yd of concrete and runs $4,800–$9,600 installed, so the building on its slab comes to $22,400–$58,000. A 6 in slab, for a car lift or heavy equipment, takes 29 cu yd and runs $7,200–$12,000.

The slab cost is a per-square-foot range from the cost guides of Angi, HomeGuide and This Old House: $4 to $8 per square foot for 4 in. The concrete count covers the footprint, a thickened edge under the walls and extra for spillage: 4 in slab, 12 in thickened edge, 10% extra. A 4 in slab is above the code minimum for a concrete floor on the ground (International Residential Code, section R506.1). Grading, fill or a pump to reach the site cost more.

The thickened edge in the concrete count is a planning allowance, not a footing design: its depth is local, and a red-iron building’s piers and anchor bolts come from its engineer.

Snow load and the price

Enter a ZIP code in the designer and it looks up the ground snow load in the Utah State University snow-load data release (2023), CC BY 4.0, from weather stations within 25 km (16 miles) of it. The ranges on this page do not change with the load; a dealer’s quote does, because a frame and a roof built for a heavier load take more steel.

That is a planning value from a named dataset, not an engineer’s design. The building code sets the ground snow load for your site, and the building’s designer works out the roof load from it.

How the numbers are worked out

Price range

What it covers: A tube-steel building at the dealer’s list price, delivered and installed on your level site. The slab and site preparation are extra.
What moves it: The roof area, the wall area and the doors. The model behind it is fitted to 146 published prices from Alan's Factory Outlet, Carport Central and Get Carports.
Why it is wide: Sellers list the same building at very different prices, and the range holds the middle 80% of them. Where your quote lands depends on the seller, the steel and the options you add.
Where it stops: The data holds widths of 12 to 100 ft, lengths of 20 to 250 ft and walls of 6 to 20 ft; past them the designer marks the range as rough. Steel kits and post-frame buildings are priced by their own models, from their own sellers.

Per square foot and what a change adds

The price per square foot is the installed range divided by the floor area, each end rounded to the dollar: the same range, as wide, for the same doors. What a door or a taller wall adds is the model’s price with the change less its price without it, at each end of the range.

Questions

How much does a 40X60 metal building cost with a slab?

$36,300–$92,600 for a 40 × 60 ft tube-steel building with 14 ft walls and two 12 × 12 ft roll-ups, one walk door, delivered and installed on a 4 in slab. The building lists for $26,700–$73,400 and the slab runs $9,600–$19,200; it takes 38 cu yd of concrete. The 40x60 page prices it by wall height.

What does a 20X20 metal building cost?

$8,600–$23,700 delivered and installed, with 10 ft walls and two 8 × 8 ft roll-ups, one walk door. That is $22–$59 per square foot, the most of any size in the table. A 4 in slab adds $1,600–$3,200.

What is the average cost of a 30x50 metal building with a slab?

$26,000–$67,000 for a 30 × 50 ft building with 12 ft walls on a 4 in slab: $20,000–$55,000 for the building and $6,000–$12,000 for the slab, which takes 25 cu yd of concrete. It is a range, not an average: the middle 80% of what sellers list.

How much does a 50x100 ft steel building cost?

$48,100–$132,400 in tube steel with 16 ft walls and two 14 × 14 ft roll-ups, two walk doors, delivered and installed: $10–$26 per square foot. As a steel kit, before freight, erection and doors, it lists for $46,900–$88,000. A 4 in slab adds $20,000–$40,000.

How much does it cost to build a 2000 sq ft metal house?

This site prices the shell. A 40 × 50 ft building is 2,000 sq ft; with 12 ft walls it lists for $22,300–$61,300 in tube steel, delivered and installed, and its slab runs $8,000–$16,000. A house inside it adds insulation, interior walls, plumbing, wiring and finishes, which these prices do not hold.

Sources

Building prices: 146 published prices of tube-steel buildings from Alan's Factory Outlet, Carport Central and Get Carports, read Oct 30, 2026. Steel kits: 68 published prices from Armstrong Steel, QE Building Co., Simpson Steel Building Company, Sunward Steel and Worldwide Steel Buildings. Post frame: 92 from FBi Buildings and Hansen Pole Buildings.
Slab cost: concrete slab cost guides by Angi, HomeGuide and This Old House.
Snow loads: Wagstaff, Wheeler, Bean, Maguire and Sun (2023), Supplementary Files for "Adaptive Mapping of Design Ground Snow Loads in the Conterminous United States". Utah State University snow-load data release (2023), CC BY 4.0.
2024 International Residential Code, chapter 5 (floors), section R506.1: the minimum thickness of a concrete floor on the ground.
FEMA P-957, Snow Load Safety Guide (January 2013), section 2.1: how the code’s ground snow load becomes the design load on a roof.

Metal building cost calculator: price per sq ft

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