Quick Answer: A 30×40 metal building (1,200 sq ft) typically runs $21,000–$24,700 kit-only (~$19.04/sq ft) or $29,500–$34,700 fully installed turnkey (~$26.76/sq ft). Get your free quote for the exact number on your site.
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Most kits run $16–$20 per sq ft. Your real number depends on size, location, foundation & finish. Takes two minutes to find out.
14,068 kits sold 50-year Structural Warranty
A 30×40 is a step up from a single garage bay — at 1,200 square feet it’s large enough to hold multiple vehicles, a full workshop, or the shell of a compact living space, while still fitting on most standard residential or rural lots without needing extra acreage. It’s one of our most-quoted sizes because it hits a practical middle ground: big enough to be genuinely useful, small enough to keep permitting and site prep straightforward in most areas.
How Much Does a 30×40 Metal Building Cost?
| Cost Component | Estimate |
|---|---|
| Kit only (DIY) | $21,000–$24,700 total (~$19.04/sq ft avg) |
| Turnkey (installed) | $29,500–$34,700 total (~$26.76/sq ft avg) |
| Concrete foundation add-on | ~$6,000 |
| Professional labor add-on | $3–$5/sq ft |
These figures reflect current published industry benchmarks for this size, positioned at our wholesale rate — get a quote for pricing specific to your location.
Popular Uses for a 30×40 Metal Building
At 1,200 square feet, a 30×40 has enough room to combine functions rather than serve just one purpose:
- RV or boat garage with room to spare — the extra length over a 30×30 accommodates longer vehicles with space left over for a workbench
- Small barndominium shell — a popular starting footprint for an efficiency-style live/work layout; see our barndominium options for what’s involved in converting a shell like this
- Two-bay garage with an attached workshop — park two vehicles and still keep a dedicated shop area
- Combination workshop and small storefront — enough space for equipment plus a customer-facing area for a home-based business
- Home-based business workshop or storage — inventory, tools, and equipment for a growing side business
- Small equipment or vehicle fleet storage — landscaping equipment, trailers, or multiple smaller vehicles
See the full size index for every available size if 30×40 isn’t quite the right fit.
What’s Included
Kit-only pricing on a 30×40 building covers the primary steel frame, roof and wall panels, one walk door, one drive-in door, engineering stamps sized to your local code, and delivery to your site — the full structure, ready for you or a contractor to assemble.
Turnkey pricing adds the concrete foundation, professional erection and labor, and permit coordination, so the building shows up finished rather than as a kit still waiting on a crew.
Not included at either level: insulation, interior finish-out, custom colors, additional windows beyond the standard package, and electrical or plumbing rough-in. See insulation options and finishing options for what those typically add to a 30×40, which matters more at this size if you’re eyeing a barndominium conversion.
What Affects Your Price
- Foundation type — a standard 4″-6″ slab is the baseline; a foundation engineered for a residential conversion or difficult soil costs more
- Region — labor rates and code requirements vary meaningfully by state; check your state page for local specifics
- Finishing level — insulation, interior walls, and custom exterior colors are priced separately from the base structure
- Door and window count — the standard kit includes one walk door and one drive-in door; a barndominium-style layout typically adds several more of each
Foundation Requirements for a 30×40
A 30×40 building typically sits on a standard 4″-6″ concrete slab, estimated at around $6,000 for this footprint. That’s a meaningful step up from smaller sizes, since a 1,200 sq ft slab requires more material and more site time to pour correctly.
- Soil conditions — soft, sandy, or expansive soil may require additional reinforcement, especially if the building will eventually be finished as living space
- Site prep — clearing, grading, or drainage correction adds to the base foundation cost
- Frost line depth — colder climates often require deeper footings, which raises material and labor cost
See foundation options for a full comparison of slab types.
Common Mistakes to Avoid
| Mistake | Why It Costs You | Fix |
|---|---|---|
| Comparing a kit-only quote here to someone else’s turnkey number | Turnkey includes foundation and labor, so the two prices aren’t measuring the same thing | Confirm whether every quote you’re comparing is kit-only or fully installed |
| Undersizing to 30×40 to save on sticker price when a barndominium shell is the goal | A smaller footprint can leave too little room once interior walls and finish-out are added, and expanding later is far more expensive than building right the first time | Size for your finished floor plan, not just the raw shell cost |
| Skipping a soil or site assessment before ordering | Unexpected soil conditions can add foundation cost after your budget is already set, especially relevant for a residential-grade slab | Get a soil and site check before finalizing your foundation estimate |
| Waiting to plan finishing options until after the structure is up | Retrofitting insulation, wiring, or interior finish-out costs more than specifying it at the time of your quote | Decide on your finishing level, especially if converting to living space, before your building ships |
Get Your Exact 30×40 Price
We’ve shipped more than 14,000 kits backed by 50-year structural warranties, all at wholesale pricing. Getting your exact number for a 30×40 building — priced for your location, foundation, and finish level — takes just a few minutes. Get your free, no-obligation quote.
FAQ
How much does a 30×40 metal building cost?
Kit-only pricing for a 30×40 (1,200 sq ft) building typically runs $21,000–$24,700, or about $19.04 per square foot. A turnkey, fully installed building typically runs $29,500–$34,700, or about $26.76 per square foot, before finishing options.
What can I fit in a 30×40 building?
A 30×40 comfortably fits an RV or boat with room to spare, a two-bay garage with an attached workshop, a small barndominium shell, a combination workshop and storefront, or storage for equipment and multiple vehicles.
Do I need a permit for a 30×40 metal building?
In nearly all jurisdictions, yes, and requirements are more involved at this size than for a small garage, especially if you’re planning a residential conversion. Check your state page for local permitting guidance.
Is a 30×40 metal building hard to construct myself?
The steel shell is manageable for an experienced DIY crew with the right equipment, but most 30×40 buyers hire professional labor for erection, particularly when a foundation upgrade or future finish-out is part of the plan.
What size foundation does a 30×40 building need?
A standard 4″-6″ concrete slab sized to the building’s 1,200 sq ft footprint, estimated at around $6,000 depending on soil conditions and site prep.
Can I finance a 30×40 metal building?
Yes. See financing options and rent-to-own for ways to spread out the cost instead of paying in full upfront.
How do I get an exact price for my 30×40 building?
The fastest way is a free custom quote, since pricing depends on your exact location, foundation choice, and finish level. Get your free, no-obligation quote.
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