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How Much Does a 24×40 Concrete Slab Cost in 2024?

A concrete slab is a flat surface made by pouring cast concrete. It has many uses and is vital to almost any construction project. You can turn it into flooring, roofing, or a pathway. A concrete slab measuring 24×40 is perfect if you need a flooring option for a garage or a small barndominium. 

You must prepare the funding for a concrete slab like any construction project. For this reason, you need to know the costs associated with it. Concrete slabs have several components, and it will be best to know each element’s costs. We aim to teach you how to properly compute the costs of a concrete slab to prepare an adequate budget to see your 24×40 concrete slab to completion. 

What Factors Determine the Cost of a 24×40 Concrete Slab?

The cost of a concrete slab hinges on multiple factors. Knowing about these factors and how they affect the cost of your 24×40 concrete slab is important. The first factor is size—a 24×40 concrete slab results in an area covering 960 square feet. The size of the concrete slab is critical because it will determine the number of materials you will need. 

Your location is another factor because it affects costs in several ways. For one, if you live in an area where building materials are expensive, your concrete slab will cost more to build. Shop around for building materials to identify a supplier with reasonable prices. If possible, you can also try a supplier from a different location. Compute the total costs and add the delivery fee.

This will give you an idea of whether it is more economical to get expensive supplies from a local supplier or inexpensive supplies and just shoulder the delivery fee. 

How Much Does a 24×40 Concrete Slab Cost?

A concrete slab has several characteristics that affect its cost. This section will help you understand these characteristics and their effects on pricing. 

Per Thickness

Concrete slabs can be thick or thin. Why do they have different thickness levels? A thick concrete slab can handle more weight than a thin slab. If you need a concrete slab as the flooring of your barndominium’s garage, you need a thick concrete slab to support the weight of your vehicles. This can prevent the slab from cracking due to the weight of several vehicles. Why is thickness important? Because thick concrete slabs use more building materials, making them more expensive to build. 

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ThicknessCost per square foot
4 inches $5.35
5 inches  $5.80
6 inches $6.20 
8 inches$7
A table showing the average cost of concrete slabs per square foot in 2023, depending on thickness (1).


Inclusions are the tools and materials you need to make a concrete slab. A concrete mixer is an example of inclusion. This is an important piece of equipment because it ensures you properly mix concrete. It can also help you mix concrete faster to complete your slab on schedule. For small projects, a one-bag concrete mixer should be enough, and you can rent one from a local building or rental company. However, buying a concrete mixer might be more practical if you know that you will mix concrete for future projects. 

Inclusion Cost 
Cement Mixer          Prices start at $439 (2)
Concrete Mixer Rental$97 per day (3)
Concrete Rebar $1.40 – $1.85 per 2 feet (4)
Wire Mesh$0.28 per square foot (5)
This table shows the average costs of inclusions when making a concrete slab in 2023.

With Additional Features

Some concrete slabs have additional features depending on what the slab is for. Stained concrete slabs are excellent options for floorings of barndominiums and pole barn homes. Stained concrete slabs have added colors to make them more appealing. They can be more expensive but will add value to your property. Another option is to use stamped concrete. These are slabs made to look like wood, tiles, or bricks. They can increase your barndominium’s cost, but they look more appealing than plain concrete. 

Vapor barrier $0.50-$0.70 per square foot (6)
Stamped concrete$9 – $20 per square foot, inclusive of materials (7)
Stained concrete$2 – $4 per square foot, staining only (8)
This table shows the average costs of added features of a concrete slab in 2023. 

24×40 Concrete Slab Cost Breakdown

Let’s look at the different components of concrete slabs. 

Concrete Bag Cost Estimate

A bag of concrete mix costs between $4.50 and $27 per bag (9). It is important to know its cost because this is the main building material you need to make a concrete slab. Concrete bags come in different sizes and mixture types, so make sure you buy the right mixture for your project.

Labor Cost Estimate

If you are hiring a contractor to build a concrete slab, expect to pay between $2 and $3 per square foot (10). However, labor rates vary depending on the prevailing rates in your area and the qualifications of the contractor you are hiring. 

Truck Cost Estimate

Building a concrete slab measuring 960 square feet will use a huge amount of concrete, and it will be more practical to buy wet concrete instead of mixing it yourself. Aside from being faster, getting wet concrete from a supplier helps ensure that you use properly-mixed concrete. Wet concrete costs between $125 and $133 per cubic yard (11). Some suppliers also have fuel surcharges of between $40 and $50 per truckload, depending on where the concrete will get delivered (9)

How Do You Calculate the Cost of a 24×40 Concrete Slab?

Now that we know all about the basics of a concrete slab, let’s compute the cost of a 24×40 concrete slab. We’re giving you several price cost averages to help you compute costs in several ways. 

The first thing that we need to do is determine how much concrete you need for a 960-square-foot concrete slab. According to this calculator, you will need 17.778 cubic yards of concrete. We’re adding 10% as a waste allowance, so you’ll need a total of 19.56 cubic yards of concrete. According to the National Ready Mixed Concrete Association (NRMCA), a cubic yard of concrete costs $137 (10). This means that 19.56 cubic yards of wet concrete costs $2,679.72.

concrete volume estimate for 24x40 slab
Concrete volume estimate for 24×40 slab

Another way of computing costs is by checking how much a square foot of concrete costs. We have already established that a six-inch thick concrete slab costs $6.20 per square foot (1). Multiply this figure by 960 square feet, and we can see that it will cost you $6,547, inclusive of the 10% waste allowance. 

Should You DIY or Hire a Contractor for Your 24×40 Concrete Slab Project?

We believe hiring a contractor to make your 24×40 concrete slab is better. Professionals can make slabs faster. They can also ensure that you have a properly completed and durable concrete slab. 


Knowing how to compute the cost of a 24×40 concrete slab is essential because we can use the computation to prepare a proper budget. If a concrete slab is part of your floor plan, you can use these computations to anticipate the amount your need in financing a barndominium or shouse to build your dream building without going over your budget. Make sure you follow our Facebook page for more informative articles about barndominiums, prefab homes, shipping container houses, and other unique metal buildings. 


  1. How Much Does A Concrete Slab Cost In 2023? Homeadvisor.
  2. Cost Of A Concrete Driveway ConcreteNetwork
  3. What Are Common Rebar Prices for Concrete Projects? Angi
  4. How to Compare the In-Place Cost of Wire Mesh Versus Synthetic Fibers ABC Polymer Industries
  5. How Much Does Crawl Space Encapsulation Cost? Angi 
  6. Stamped Concrete Cost For Patios, Driveways & More ConcreteNetwork
  7. Concrete Floor Cost – What You’ll Pay For Polished Or Stained Concrete ConcreteNetwork
  8. How Much Does Concrete Cost? Angi
  9. How Much Does a New Concrete Slab Cost? Angi
  10. How Much Does It Cost to Have Concrete Delivered in Your Area? Fixr
  11. Ready Mixed Concrete Industry Data Survey. NRMCA