Metal Building Sizes: Common Dimensions, Wall Heights & Prices
The right metal building size starts with how you will use it, not with a number off a price list. Width decides the framing and most of the cost, length decides how many bays you get, and wall height decides which doors and equipment fit.
This guide covers the most common sizes from 30x40 shops to 80x100 commercial buildings: floor area, framing by width, wall heights, slab costs and installed prices.
Metal Building Size Guides
| Size | Area | Vehicles | What Fits | Installed Price |
|---|---|---|---|---|
| 30x40 Building | 1,200 sq ft | Shop, three-car garage, equipment storage | From $16,000 installed | |
| 40x60 Building | 2,400 sq ft | Shop with office, three-bay garage, equipment barn | From $32,000 installed |
Common Metal Building Sizes Chart
| Use | Common Sizes (W x L) | Floor Area | Notes |
|---|---|---|---|
| Shop or three-car garage with a workbench | 30x40, 30x50 | 1,200 to 1,500 sq ft | One builder calls the 30x40 its most requested residential size |
| Side-entry bays on a narrow lot | 30x70 | 2,100 sq ft | Five or six bays along the 70-ft side |
| Shop with an office or small business | 40x60 | 2,400 sq ft | The commercial counterpart to the 30x40 |
| Contractor shop or farm building | 40x70 | 2,800 sq ft | One more bay than a 40x60 |
| Warehouse or multi-bay service shop | 40x100 | 4,000 sq ft | Long and narrow, six or more doors |
| Gym, church, warehouse or hay barn | 80x100 | 8,000 sq ft | Heavy framing for an 80-ft span |
How Metal Building Sizes Are Measured
Sizes are listed as width x length x eave height. A 40x60x14 is 40 feet wide, 60 feet long and 14 feet tall at the sidewall. The peak is higher, depending on the roof pitch.
Some builders quote roof length, which can run a foot longer than the frame. One builder reminds buyers to pour a 40x60 slab to 40x60, not to the 40x61 roof run. Width is clear span, so there are no posts in the middle at any of the sizes on this page.
How Wide Should A Metal Building Be?
Width does more to the price than length, because it decides the framing. One framing guide breaks it down this way:
| Building Width | Framing | Sizes On This Site |
|---|---|---|
| Up to 24 ft | Standard tubular framing | Garages and smaller shops |
| 26 to 30 ft | Welded truss | 30x40, 30x50, 30x70 |
| 32 ft and up | Commercial truss | 40x60, 40x70, 40x100 |
| Above about 50 ft | Consider red iron (I-beam) | 80x100 |
If you need more floor, adding length is usually cheaper than adding width: the truss stays the same and you only add frame lines.
How Tall Should A Metal Building Be?
Choose your biggest door first, then the wall height. Builders offer roll-up doors from 6x6 to 14x14, plus commercial doors and framed openings for a door you buy locally. Walls run from 8 to 20 feet.
| Door Height | Typical Use | Wall Height To Plan |
|---|---|---|
| 10 ft | Cars, pickups, trailers | 12 ft |
| 12 ft | Tractors, campers, a two-post lift | 14 ft |
| 14 ft | Motorhomes, loaders, large equipment | 16 ft |
| Commercial doors | Warehouses, racking, forklifts | 16 to 20 ft |
Concrete Slab Cost By Size
One 2026 guide prices garage and shop slabs at $8 to $10 per square foot. At that rate:
| Size | Floor Area | Slab At $8 To $10 Per Sq Ft |
|---|---|---|
| 30x40 | 1,200 sq ft | $9,600 to $12,000 |
| 30x50 | 1,500 sq ft | $12,000 to $15,000 |
| 30x70 | 2,100 sq ft | $16,800 to $21,000 |
| 40x60 | 2,400 sq ft | $19,200 to $24,000 |
| 40x70 | 2,800 sq ft | $22,400 to $28,000 |
| 40x100 | 4,000 sq ft | $32,000 to $40,000 |
| 80x100 | 8,000 sq ft | $64,000 to $80,000, and usually more for a commercial slab |
Shops with lifts, forklifts or heavy racking need a thicker, reinforced slab, so price the slab to the load as well as the size.
Metal Building Prices By Size
Each row comes from a single published source and is not blended with others. Prices are for the building, delivered and installed, without the slab.
| Size | Floor Area | Published Price | Source Notes |
|---|---|---|---|
| 30x40 | 1,200 sq ft | $16,000 to $23,000 installed | One builder's 2026 price list |
| 30x50 | 1,500 sq ft | $18,000 to $26,000 installed | One builder's 2026 price list |
| 30x70 | 2,100 sq ft | $29,514 installed | 30x70x12 with four 10x10 door frame-outs and a walk-in door |
| 40x60 | 2,400 sq ft | $32,000 to $48,000 installed | One builder's 2026 price list |
| 40x70 | 2,800 sq ft | $36,112 installed | 40x70x12 with two 10x10 roll-up doors (sale price) |
| 40x100 | 4,000 sq ft | $60,556 installed | 40x100x16 with two 10x10 roll-up doors (sale price) |
| 80x100 | 8,000 sq ft | By quote | A 2026 industry article puts the average at $135,000 to $182,000, without saying whether installation is included |
Wall height, door count, frame gauge (14-gauge standard, 12-gauge upgrade) and your county's wind and snow ratings move the price more than anything else.
Advertised pricing, checked November 2026. Final price depends on your state, site and options.
Metal Garage Or Metal Building?
The frames are the same. Our metal garage sizes guide is built around parking: how many vehicles fit, door sizes for trucks and campers. This guide is for shops, farm buildings and commercial space, where wall height, bay count and office space matter more. A 30x40 shows up in both, as a 30x40 garage and a 30x40 metal building.
Get Free Metal Building Quotes
Tell installers your size, eave height, doors and how you will use the building. Quotes are free, and comparing several on the same spec is the fastest way to see what your site will cost.
Metal Building Size FAQs
What Roof Style Do Larger Metal Buildings Need?
One installer requires a vertical roof on any building longer than 36 feet, which covers every size on this page. Vertical roofs add bracing and shed rain and snow down the panels.
How Long Does It Take To Install A Metal Building?
Once materials are on site, one installer puts up a 30x50 in 1 to 2 days, and another says a 40x50 usually takes 2 to 3 days. Permits, the slab and factory lead time take far longer than the install.
How Much Does Insulation Add?
One builder quotes insulation at about $3 per square foot per surface and asks that it be ordered with the building, so it goes on as the panels are installed. Adding it after the walls are closed in usually means spray foam or interior framing, which costs more.
Do You Need A Permit For A Metal Building?
Usually. Enclosed buildings bigger than a small shed generally need one, and one installer notes that commercial buildings like an 80x100 need a permit and engineered drawings everywhere. Ask for certified drawings rated for your county's wind and snow loads.
Can You Finance A Metal Building?
Some installers offer $0-down financing and rent-to-own plans with no credit check on buildings this size. Rent-to-own payments run higher than financing, so compare the total cost of both before you sign.