One of the first considerations in planning our barndominium home is budgeting for the concrete slab.

Because barndominium homes are so versatile, you can build them in almost any size. But pouring the foundation can get expensive.

Cost of a 40×60 concrete slab

Let’s say you’re building a 40×60 barndominium on a level lot. How much would a 40×60 slab cost?

The answer depends on concrete prices in your region but averages around $5-7 per square foot. So expect to spend around $12,000-17,000 for a 2400 square foot concrete slab.

Laying a cement floor
Construction crew pouring a cement slab foundation

That price should be for the fully finished slab including labor and materials. You’ll want to make sure that your slab is sufficiently engineered to support the weight of a 40×60 metal building plus any contents and vehicles.

Ask your contractor if they have a credentialed engineer who assures that the soil on your homesite is stable enough to support the building.

What factors into the price of a concrete slab?

  • Quantity of concrete mix (size and thickness of your footprint)
  • Fibermesh and rebar reinforcement
  • Wood frame template 
  • Labor and machinery

It’s a good idea to get a few estimates on price before you settle on one contractor. Ask around in your community for recommendations, the last thing you want is someone who doesn’t know what they’re doing.

Sometimes you get what you pay for, but you could overpay for a cruddy job. So make sure you ask for references and find some of their prior clients to make sure they’re happy with the results.

Man leveling concrete slab
Make sure to hire a quality contractor for best results

Poured concrete vs block foundation

Poured concrete is superior to cinder block foundation in its supportive strength, ease of installation, and water resistance.

Especially when you consider that a steel building is very heavy, making sure you get the highest quality foundation is critical.

Whenever possible, it’s best to consult with an engineer to make a plan for your foundation.

Not only do soil conditions differ from location to location, but the type of foundation that is appropriate for your building site should be chosen.

Why we love concrete slab foundations

Concrete slabs not only offer added strength and a stable footing, but you can feel comfortable driving on your slab foundation-even with the heaviest farm equipment.

Plus, concrete slab foundations are extremely resistant to extreme weather conditions like freezing.


  • Inexpensive compared to basement or crawl space
  • Lack of air space under house decreases utility bills
  • Quick to build compared to basement or crawl space
  • No space under your house for pests, mold, or mildew
  • Strong enough to support heavy builds and vehicles


  • No space under house for ducts or wires
  • Expensive to change or repair plumbing within slab
  • May crack in extreme weather conditions or with poor site prep
  • Inexperienced concrete pourers may leave an uneven surface

So that’s 40×60 concrete slab cost

Remember that the initial cost can be increased a lot by hiring a subpar contractor. So the most important thing to do is get the best you can afford and ALWAYS check references.