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.
Not quite the right footprint? Price any dimensions with the metal building price calculator, or read what metal buildings cost per square foot before you commit to a size.
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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