Metal building kit prices by size

A steel building kit is the building in parts, shipped for you or a crew to put up. Each size below is priced twice, by models fitted to published prices: as a steel kit, and as a tube-steel building delivered and installed with the doors listed under its size. Prices were read Oct 30, 2026; each range holds the middle 80% of what sellers publish for a comparable building. Pick a size to open it in the designer above.

Size	Cars inside	Steel kit	Price, installed	4 in slab	Concrete
20 × 24 ft10 ft walls, two 8 × 8 ft roll-ups, one walk door	2 cars	$9,500–$17,700	$9,300–$25,700	$1,900–$3,800	9 cu yd
30 × 40 ft12 ft walls, three 10 × 10 ft roll-ups, one walk door	3 cars	$15,700–$29,400	$17,600–$48,400	$4,800–$9,600	20 cu yd
30 × 50 ft12 ft walls, three 10 × 10 ft roll-ups, one walk door	3 cars	$18,100–$34,000	$20,000–$55,000	$6,000–$12,000	25 cu yd
40 × 60 ft14 ft walls, two 12 × 12 ft roll-ups, one walk door	6 cars	$25,800–$48,400	$26,700–$73,400	$9,600–$19,200	38 cu yd
50 × 80 ft16 ft walls, two 14 × 14 ft roll-ups, one walk door	8 cars	$39,000–$73,200	$40,200–$110,600	$16,000–$32,000	62 cu yd
60 × 100 ft16 ft walls, two 14 × 14 ft roll-ups, two walk doors	10 cars	$54,600–$102,300	$54,800–$150,900	$24,000–$48,000	91 cu yd

The two columns are not the same purchase. The kit price stops when the steel leaves the seller: Kit only: frame, panels, trim and stamped drawings. Delivery, erection, doors and slab extra. The installed price has the crew and the doors in it: Delivered and installed on a level site. Slab and site prep extra.

These are ranges of published list prices, not quotes. Freight to your site, the steel gauge, the snow load the frame is built for and options such as insulation change what a seller quotes.

What a metal building kit includes

In the listings behind the kit prices, from Armstrong Steel, QE Building Co., Simpson Steel Building Company, Sunward Steel and Worldwide Steel Buildings, a kit is the steel and the paperwork: the frame, the wall and roof panels, the trim, and drawings stamped by an engineer for the loads at your site. The frames are red-iron I-beams or lighter cold-formed and open-web steel.

What is left for you to buy or arrange:

Freight from the plant to your site, quoted by the seller.
Erection: a crew and equipment to stand the frame and hang the panels, or your own time.
Doors: the kits come with framed openings, and the doors are bought on top.
The foundation: a slab or piers to the engineer’s drawings, with anchor bolts set before the steel arrives.

The installed buildings in the second column are tube steel, sold by dealers whose crews set them on your level site, with the doors in the price. The designer above prices that kind; the kit for the same size is in the table.

Kit or installed: comparing like with like

For the 30 × 50 ft building the designer opens on, with 12 ft walls and three 10 × 10 ft roll-ups, one walk door:

Steel kit: $18,100–$34,000, before freight, erection, doors and slab.
Tube steel, installed: $20,000–$55,000, with the crew and the doors.
Post-frame kit: $21,400–$39,100. Materials kit, usually delivered. Labor and slab extra.

The kit and the installed building overlap, so neither is cheaper by rule. Add the crew’s price, the doors and the freight to the kit before you compare it with an installed building, and compare the frames too: red iron, cold-formed steel and tube steel are different buildings at the same size.

The slab is extra for all three. Under a 30 × 50 ft building a 4 in slab takes 25 cu yd of concrete and runs $6,000–$12,000 installed, from the cost guides of Angi, HomeGuide and This Old House.

Types of metal building kits

Red-iron and cold-formed steel kits from Armstrong Steel, QE Building Co., Simpson Steel Building Company, Sunward Steel and Worldwide Steel Buildings: shops, warehouses and barndominium shells, in the widest spans. The kit column above.
Post-frame kits from FBi Buildings and Hansen Pole Buildings: wood posts set in the ground carry the steel panels. A 30 × 50 ft kit lists for $21,400–$39,100.
Quonset arch kits from SteelMaster Buildings: the arch is the wall and the roof in one. DIY kit, end walls not included. A 30 × 50 ft arch lists for $17,700–$23,600.
Tube-steel buildings, carports, garages and barns on a light tube frame, mostly sold installed by dealers: the installed column above and the designer.

Choosing a kit

Size the building from what it has to hold, not from a list of sizes. The designer opens on a 30 × 50 ft building with three 10 × 10 ft roll-ups, one walk door: “Fits two pickups and a tractor.” Park your own vehicles in it, then:

Doors set the walls. A roll-up door sits under the eave, so the door you need sets the wall height, and the wall height moves the price most once the size is set. With 10 ft walls this building lists for $18,800–$51,700 installed, with 16 ft walls for $22,400–$61,600.
The ZIP sets the load. Enter it in the designer for the ground snow load from the Utah State University snow-load data release (2023), CC BY 4.0, and give it to the seller: the kit is drawn for a stated load.
The slab comes first. Its anchor bolts follow the kit’s drawings, so the drawings come before the pour.

The snow load here is a planning value from a named dataset, not an engineer’s design. The building code sets the load for your site, and the kit’s engineer designs the frame for it.

How the numbers are worked out

Price range

What it covers: The kit column: a steel kit at the seller’s list price, before freight, erection, doors and slab. The installed column and the designer: a tube-steel building at the dealer’s list price, delivered and installed on your level site, without the slab.
What moves it: The roof area and the wall area, and for the installed building the doors. The kit model is fitted to 68 published kit prices; the installed model to 146 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. The steel gauge, the frame and the load it is drawn for move a quote within it.
Where it stops: Each model is used inside the sizes its sellers publish; a size outside them is marked rough. A kit price here is not a freight or an erection quote.

Concrete and fit

The concrete is the slab’s volume plus a thickened edge under the walls and extra for spillage, rounded up: 4 in slab, 12 in thickened edge, 10% extra. The fit places each vehicle behind a roll-up door with room to open its doors and walk around it.

Questions

What is the average cost of metal building kits?

It depends on the size more than anything. In the table, a 20 × 24 ft steel kit lists for $9,500–$17,700, a 40 × 60 ft kit for $25,800–$48,400 and a 60 × 100 ft kit for $54,600–$102,300, before freight, erection, doors and slab. Each is the middle 80% of what sellers list, not an average.

What are the common sizes of metal building kits?

Garages from about 20x24, shops of 30x40 to 40x60, and barns and warehouses of 50x80 and up: the sizes in the table. Sellers draw a kit to any width and length, so start from what it has to hold and open that size in the designer.

How to choose the right metal building kit?

Fit the size to what you will park or store, set the walls by the tallest door you need, give the seller your ZIP for the snow load, and compare the kit with the crew, doors and freight added against an installed building. The section above walks through each step.

What are the different types of metal building kits?

Red-iron and cold-formed steel kits, post-frame kits on wood posts, Quonset arch kits, and tube-steel buildings sold mostly installed. For a 30 × 50 ft footprint they list for $18,100–$34,000, $21,400–$39,100, $17,700–$23,600 without end walls, and $20,000–$55,000 installed.

Sources

Steel kit prices: 68 published prices from Armstrong Steel, QE Building Co., Simpson Steel Building Company, Sunward Steel and Worldwide Steel Buildings, read Oct 30, 2026. Post-frame kits: 92 from FBi Buildings and Hansen Pole Buildings. Arch kits: 9 from SteelMaster Buildings.
Installed prices: 146 published prices of tube-steel buildings from Alan's Factory Outlet, Carport Central and Get Carports.
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.
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 kits: prices by size and what’s included

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