How much does a 30x40 pole barn cost?
A 30x40 pole barn (1,200 square feet) costs $18,000–$48,000 according to HomeGuide's 2026 guide, and $20,000–$35,000 as a contractor-built shell according to PoleBarnCosts' 2026 guide.
With a concrete slab and basic electrical, PoleBarnCosts puts the national average at $35,000–$40,000.
HomeGuide publishes one range for the size. PoleBarnCosts prices each stage of the build separately, and the ladder below shows those stages, so you can see which one your own building is.
These are ranges published by two cost guides, not quotes, and not prices a builder has given us. Both guides were read on 2 November 2026: PoleBarnCosts, 30x40 pole barn cost and HomeGuide, pole barn prices.
What does a 30x40 cost at each stage of the build?
Most of the spread in 30x40 prices online is one word: finished. A kit, a shell, a shell with a floor, a wired shell and a fully finished building are different purchases, so the table runs through them in the order a build adds cost.
| Stage | Published range | What it covers |
|---|---|---|
| Kit, materials only | $12,000–$20,000 | Posts, trusses, purlins, girts, steel panels, trim and hardware. No slab, overhead door, electrical, site work or permits. |
| Contractor-built shell | $20,000–$35,000 | Materials and labor to erect the building, usually with the permit. No slab. |
| Shell with concrete slab | $26,000–$42,000 | The shell plus the poured floor. |
| Slab plus electrical | $30,000–$48,000 | The slab plus a basic electrical package. |
| Fully finished | $35,000–$55,000 | Insulated, wired, with doors. |
Every row above is PoleBarnCosts' published range for a 30x40, read on 2 November 2026. Source: PoleBarnCosts, 30x40 pole barn cost.
What does a 30x40 cost as a garage, a workshop or farm storage?
The use decides the specification, and the specification decides the stage on the ladder above.
| Use | Published range | What it covers |
|---|---|---|
| Vehicle storage or garage | $28,000–$42,000 | Slab, two overhead doors, a walk-in door, basic electrical with lighting and insulation blankets. |
| Workshop | $32,000–$50,000 | The garage specification plus 220V circuits, more outlets and insulation for year-round use. |
| Agricultural storage | $18,000–$28,000 | Shell with one overhead door, a gravel floor and no insulation. |
These three totals are also PoleBarnCosts' published ranges for a 30x40, read on 2 November 2026. Source: PoleBarnCosts, 30x40 pole barn cost.
A second published range, for comparison
HomeGuide's 2026 guide gives $15–$40 per square foot installed for a pole barn, which at 1,200 square feet is the $18,000–$48,000 above. Source: HomeGuide, pole barn prices.
What moves the price of a 30x40 pole barn?
Seven things move a 30x40 up or down its range: the floor, the doors, the wall height, the steel, the insulation, the electrical and where you are building. Each figure below is one source's published range.
The concrete floor
A concrete slab adds $6,000–$12,000 to a 30x40: a 4-inch slab runs $6,000–$8,500 and a 6-inch reinforced slab for heavy equipment $9,000–$12,000.
Doors
A 10x10 overhead door costs $800–$2,000 installed; a 12x12 or 12x14 door for taller vehicles runs $1,500–$3,500.
Wall height
Going from the standard 10–12 foot eave to 14–16 feet adds $2,000–$5,000 in longer posts, more siding and reinforcement.
Steel thickness
Upgrading from 29-gauge to 26-gauge steel adds $1,500–$3,000.
Insulation
Fiberglass batts for walls and ceiling run $1,500–$3,000, vinyl-backed blankets $2,000–$4,000 and spray foam $4,000–$8,000.
Electrical
A basic electrical package (panel, 6–8 outlets, lights) runs $2,500–$4,500 and a workshop package with a subpanel and 220V circuits $4,500–$7,500.
Where you build
PoleBarnCosts says prices vary 20–40% by region, with Midwest states the lowest, and gives a contractor-built shell at $20,000–$28,000 in Indiana or Ohio and $28,000–$35,000 or more in the Northeast or West Coast.
Whichever range you compare against, a builder's quote should say which stage of the ladder it prices. A shell quote and a finished quote for the same 30x40 are different buildings.
Get 30x40 quotes from builders in your state
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30x40 pole barn cost: frequently asked questions
How much does a 30x40 pole barn cost?
A 30x40 pole barn (1,200 square feet) costs $18,000–$48,000 according to HomeGuide's 2026 guide, and $20,000–$35,000 as a contractor-built shell according to PoleBarnCosts' 2026 guide.
How much does a 30x40 pole barn cost installed?
Installed, HomeGuide gives $15–$40 per square foot for a pole barn, which at 1,200 square feet is the $18,000–$48,000 range. PoleBarnCosts' contractor-built shell, with materials and labor, is $20,000–$35,000.
How much does a 30x40 pole barn cost with a concrete slab?
PoleBarnCosts publishes $26,000–$42,000 for a contractor-built 30x40 with a concrete slab. The slab alone adds $6,000–$12,000.
How much does a finished 30x40 pole barn cost?
PoleBarnCosts publishes $35,000–$55,000 for a fully finished 30x40 that is insulated, wired and fitted with doors.
How much does a 30x40 pole barn kit cost?
PoleBarnCosts publishes $12,000–$20,000 for a 30x40 kit of materials only. A kit does not include the slab, overhead door, electrical, site work or permits.
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