If you're pricing out a 30x40 metal building, you already know the building itself is only part of the budget. The concrete slab underneath it is just as important, and most buyers don't find out what it costs until they're already deep in the process.

We want to change that. This guide breaks down the full cost of a 30x40 metal building with a concrete slab so you know exactly what you're looking at before you pick up the phone.

The 30'x40'x9' Workshop Garage Building (AMS#80) from Arkansas Metal Structures is priced at $17,475. Add a concrete slab at $6–$12 per square foot ($7,200–$14,400 for 1,200 sq ft) and your total project cost runs between $24,675 and $31,875. Call us for your exact quote.

Here's everything that goes into that number.

How Much Does a 30x40 Metal Building Cost?

A 30x40 metal building covers 1,200 square feet of usable space. That's enough room for a two- or three-car garage, a serious workshop, a small barn, or a combination of all three. It's one of the most popular sizes we sell, and for good reason: it hits the sweet spot between affordable and genuinely useful.

Pricing on a 30x40 metal building varies based on roof style, wall height, doors, windows, and the accessories you choose. To give you a concrete reference point, one of our most popular options in this size is the 30'x40'x9' Workshop Garage Building (AMS#80) — a fully enclosed, vertical-roof steel building with the following standard specs:

What's Included in the AMS#80 Workshop Garage Building

Dimensions: 30 ft wide x 40 ft long x 9 ft eave height
Roof: Vertical style (superior drainage, longer-lasting finish)
Frame: 14-gauge galvanized steel
Panels: 29-gauge steel
Doors: Two 8'7" roll-up doors on the end, one 8'7" roll-up door on the side
Entry: Two walk-in doors
Windows: One 24"x36" window
Wind rating: 140 MPH certified
Snow load: 35 PSF certified
Warranty: 20-year rust-through + 30-day workmanship
Delivery and installation: Included at no extra charge

The AMS#80 is priced at $17,475. Final pricing may vary slightly based on your location, color selections, and any add-ons you choose. Call us at +1 (479) 408-5300 or request a free quote to confirm your exact price.

Optional Add-Ons That Affect Your Total

The base building is a ready-to-go structure, but many customers like to customize theirs. Common upgrades that affect the final price include:

Add-On	What It Does
Additional height	More clearance for tall vehicles or equipment
Extra roll-up doors	Easier drive-through access
Insulation package	Double bubble, R17 single, or Prodex R17 double
Lean-to additions	Extra covered space attached to the main structure
Color customization	14 color options for roof, walls, and trim

We offer insulation starting at $1.50/sq ft for Double Bubble, $2.00/sq ft for R17 Single, and $3.00/sq ft for Prodex R17 Double. These are worth factoring into your budget early if you plan to work in the building year-round.

How Much Does a Concrete Slab Cost for a 30x40 Building?

The concrete slab for a 30x40 building covers 1,200 square feet, and the cost depends primarily on how thick you pour it.

We price concrete slabs at $6 to $12 per square foot, depending on thickness. Here's how that breaks down for a standard 30x40 footprint:

Concrete Slab Cost by Thickness

Slab Thickness	Best For	Cost Per Sq Ft	Total Cost (1,200 sq ft)
4 inches	Light use, personal vehicles, storage	$6.00	$7,200
5 inches	General workshops, moderate loads	$8.00	$9,600
6 inches	Heavy equipment, trucks, commercial use	$10.00	$12,000
6+ inches (reinforced)	Very heavy loads, lifts, commercial vehicles	$12.00	$14,400

Which thickness do you need? Here's the simple rule:

4-inch slab: Fine for storage, standard passenger vehicles, and light workshop use
5-inch slab: A safe choice for most homeowners using the building as a garage or hobby shop
6-inch slab: The right call if you're parking heavy trucks, running a vehicle lift, or storing farm equipment
6+ inch reinforced: Required for commercial operations or anything with concentrated point loads

Pro tip: Going from a 4-inch to a 6-inch slab adds roughly $7,200 to your foundation cost but can make a significant difference in longevity and load capacity. If you're on the fence, go thicker. You can't pour more concrete under an existing building.

Why Getting the Slab Right Matters

A metal building is only as solid as what it sits on. An undersized slab can crack under load, shift with freeze-thaw cycles, or create drainage problems that affect the structure above it. We see it happen when buyers use a separate concrete contractor who doesn't coordinate with the building specs. That's exactly why we handle both — our team pours the slab to match your building's anchor layout and load requirements from day one.

Total Cost: 30x40 Metal Building With Concrete Slab

Now let's put it all together. The table below combines the building cost with our concrete slab pricing at each thickness level. Building pricing is based on a quote for the 30'x40'x9' Workshop Garage Building (AMS#80) — call us at +1 (479) 408-5300 for your exact number, since final pricing depends on location and configuration.

Combined Cost Estimate: AMS#80 + Concrete Slab

Slab Thickness	Slab Cost	AMS#80 Building	Total Project Cost
4-inch	$7,200	$17,475	$24,675
5-inch	$9,600	$17,475	$27,075
6-inch	$12,000	$17,475	$29,475
6-inch reinforced	$14,400	$17,475	$31,875

The biggest variable in your total is slab thickness. Going from a 4-inch to a 6-inch slab adds $4,800 to your foundation cost, but it's the right call if you're parking heavy trucks or running equipment. Most buyers who go the two-vendor route spend more time, more money, and deal with coordination headaches that slow the whole project down. Bundling both with us keeps it simple.

What's Not Included in These Numbers

To give you a complete picture, here are costs that fall outside the building and slab:

Site preparation and grading: If your land needs leveling before we pour, that's a separate cost. Budget $1,500 to $6,000 depending on the condition of your site.
Permits: Local building permits typically run $500 to $2,500. Requirements vary by county and state.
Electrical and plumbing: If you need power or water inside the building, that's contracted separately with a licensed electrician or plumber.
Interior finishing: Drywall, flooring beyond the concrete slab, and interior walls are not part of the standard build.

Most buyers are surprised by how manageable the total is once they see the full picture in one place. The biggest variable is almost always the slab thickness and whether the site needs grading work before we start.

Why Buy Your Building and Concrete Slab From the Same Company?

Most metal building companies sell you the structure and wish you luck finding a concrete contractor. You're left making calls, getting separate quotes, coordinating schedules, and hoping both crews show up on the same timeline.

We do it differently. At Arkansas Metal Structures, we handle the concrete slab and the building under one contract. That means:

One point of contact for your entire project, from site prep to final installation
Anchor bolt placement is coordinated with your building's exact specs — no misalignments, no rework
One project timeline instead of two separate schedules that may or may not line up

When a concrete contractor pours a slab without knowing the building's anchor layout, mistakes happen. Bolts end up in the wrong position. The slab edge doesn't align with the building perimeter. These aren't catastrophic problems, but they cause delays and extra costs. Our team avoids them entirely because we're working from the same set of plans.

The bottom line: buying your building and your slab from us isn't just more convenient. It's the smarter way to build.

What Makes the AMS#80 a Smart Choice for a 30x40 Build?

There are plenty of 30x40 metal buildings on the market, but the 30'x40'x9' Workshop Garage Building (AMS#80) stands out from the crowd. Why?

Built to Handle Real Conditions

The AMS#80 is engineer-certified to withstand 140 MPH winds and 35 PSF snow loads. That's not a marketing claim. It’s a stamped certification that matters when your county processes a building permit. Many cheaper buildings skip this step entirely, leaving you with a structure that can't be legally permitted in certain jurisdictions.

Vertical Roof: Worth the Upgrade

The AMS#80 comes standard with a vertical roof, which is the best roof style available on a metal building. Here's why it matters:

Panels run vertically, so rain and debris shed off the roof instead of sitting on it
Vertical roofs last significantly longer than boxed-eave or regular-style roofs in wet climates
They're the only roof style we recommend for buildings that will be used year-round

Three Roll-Up Doors as Standard

Most workshop garages come with one or two roll-up doors. The AMS#80 includes three. Two on the end wall and one on the side. That gives you drive-through access options and makes it significantly easier to move large equipment, vehicles, or materials in and out without awkward maneuvering.

100% American-Made Steel

All of our buildings use American-made steel. That matters for quality consistency, lead times, and supporting domestic manufacturing. You're not getting a building that sat in a container for three months before arriving at your property.

Free Delivery and Installation

The price you get for the AMS#80 includes delivery and professional installation. We serve Arkansas and surrounding states, and our crews handle the full build. You don't need to hire a separate installation crew or rent equipment.

Frequently Asked Questions

How much does a 30x40 metal building with a concrete slab cost?

The concrete slab alone for a 30x40 building (1,200 sq ft) costs between $7,200 and $14,400 depending on thickness, at our rate of $6 to $12 per square foot. The AMS#80 30'x40'x9' Workshop Garage Building is priced at $17,475, making the total project cost $24,675 to $31,875 depending on slab thickness.

What thickness concrete slab do I need for a metal building?

For most residential uses, a 4- to 5-inch slab is sufficient. If you plan to park heavy trucks, use a vehicle lift, or store farm equipment, go with a 6-inch or reinforced slab.

Does Arkansas Metal Structures pour the concrete slab?

Yes. We handle both the building and the concrete slab, which is unusual in this industry. It means one contract, one timeline, and anchor bolts placed correctly the first time.

Is delivery and installation included in the building price?

Yes. Free delivery and professional installation are included with every building we sell, including the AMS#80. You're not paying extra for a crew to show up and put it together.

How long does it take to complete a 30x40 metal building with a slab?

Timeline depends on your location, permit requirements, and site conditions. Once permits are in hand and the site is ready, most builds are completed within a few weeks.

Can I Customize the AMS#80?

Absolutely. You can adjust the height, add more doors and windows, choose from 14 color options for the roof, walls, and trim, add insulation, or include a lean-to. The AMS#80 is a starting point, not a limitation. Use our 3D builder to design your version before you call.

Ready to Get Your 30x40 Metal Building With a Concrete Slab?

You now have the full cost picture. The AMS#80 is $17,475. The slab runs $7,200 to $14,400 depending on thickness. Bundle both with us and one team handles everything from the ground up. No second contractor, no coordination headaches.

Here's how to take the next step:

Call us at: +1 479-440-8281 and talk to someone who can give you a real number for your location and specs
Design your building: Use our free 3D builder to visualize your layout before you commit
Request a quote: Get a free, no-obligation quote online and we'll follow up with pricing

We've been building metal structures for over 29 years. We know what it takes to get a build done right, on time, and without the runaround. Give us a call and let's get started.

30x40 Metal Building Cost With Concrete Slab: What to Budget in 2026