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How Much Does a 25×25 Concrete Slab Cost in 2024?

Knowing how much money you are expected to spend is essential when making a concrete slab. Concrete slabs are vital to construction projects because you can use them as flooring, walkways, or driveways. A 25×25 concrete slab is an excellent choice if you are looking to make flooring for an accessory dwelling unit for visiting in-laws or if you want to build a starter barndominium for rental purposes. 

The cost of a 25×25 concrete slab depends on factors like size, thickness, and the price of building materials. We will go over these factors to understand why they affect the overall cost of your project.

Read on, and we will discuss the breakdown of a concrete slab’s cost to help you develop an accurate budget for your 25×25 concrete slab. 

What Factors Determine the Cost of a 25×25 Concrete Slab?

How much you need to spend making a 25×25 concrete slab depends on several factors. One of these factors is the overall size of the slab. Making a 25×25 concrete slab gives you a total floor area of 625 square feet. A concrete slab’s size is important because the larger the slab is, the more building materials you need to make it. 

Another factor is your location. If building materials are costly in your location, expect your concrete slab to be pricier. If the site is not easily accessible, some suppliers will charge higher delivery fees. Location can also affect labor costs. If the labor rates in your location are high, you’ll need to set aside more money for labor expenses. Some contractors charge more if the construction site is hard to reach. 

How Much Does a 25×25 Concrete Slab Cost?

The characteristics of a concrete slab affect the cost of a concrete slab. This section will explain the characteristics of concrete slabs and why they are important. 

Per Thickness

Concrete slabs have varying thicknesses depending on their intended use. Thick slabs are often reserved for load-bearing purposes. A thick slab can handle the stress of heavy loads without resulting in cracks or breaks. For example, if you have a garage that houses a boat or an RV, a thick slab is a better choice because these are heavy machines.

If you want to install a pathway around your barndominium, a thin slab will suffice because it can handle the weight of a person walking on it. So, why should the thickness of a slab matter when it comes to cost? Because a thicker slab uses more materials and will cost more to make. 

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)


Making a concrete slab requires building materials, tools, and equipment. If you want a properly-made concrete slab, you cannot do without these things. These are called inclusions. A reinforcing bar or rebar is an excellent example of inclusion. A rebar can help you properly form your concrete slab. Aside from giving your concrete slab form, the use of rebar can help improve its tensile strength.

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As a result, there will be minimal cracks on the concrete slab. A wire mesh is an alternative to using rebar. It is cheaper because it is thinner. A wire mesh should be enough for a thin concrete slab. 

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

Although most concrete slabs are plain, some have additional features. These features vary depending on how you will use the slab. If your floor plan includes a basement, you need to add a vapor barrier to your concrete slab flooring. The flooring of a basement is vulnerable to moisture and leaks.

A vapor barrier can help prevent moisture from getting through the concrete slab and causing water damage. Excessive moisture in pole barn homes and barndominiums can encourage mold growth and endanger the health of their occupants. Mold damage is hard to control and can reduce your barndominium’s value if you decide to sell it in future. 

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.

25×25 Concrete Slab Cost Breakdown

Let us now break down the cost of a 25×25 concrete slab.

Concrete Bag Cost Estimate

Making a concrete slab requires using concrete mix. This is your primary building material, costing around $4.50 – $27 per bag (9). The price of a bag of concrete mix will depend on the size of the bag and the type of mixture it contains. 

Labor Cost Estimate

Labor costs can set you back around $2 – $3 per square foot (10). These figures can be higher should you decide to hire a veteran builder because they often charge more than those with less experience. If you make a concrete slab while building your barndominium, the labor expenses will be tallied in the final barndominium cost

Truck Cost Estimate

If you want to build your concrete slab quickly, consider getting wet concrete delivered. This will eliminate the need to mix concrete, which takes time. Getting wet concrete delivered can also help you ensure that the mixture you will use is properly mixed. Wet concrete gets delivered on concrete mixer trucks and costs around $125 – $133 per cubic yard (11). Depending on the supplier, you might have to pay around $40 – $50 per truckload as a fuel surcharge if your area is remote or beyond the supplier’s service area. 

How Do You Calculate the Cost of a 25×25 Concrete Slab?

There are several ways to compute how much a 25×25 concrete slab will cost. We will provide you with several price cost averages you can use as a reference in computing your concrete slab’s cost. 

Let us start by calculating the amount of concrete you need to make a 625-square-foot concrete slab. This calculator estimates that you need 11.574 cubic yards of concrete. Note that we are using six inches as the reference thickness since this is how thick most concrete slabs are. We will also add 10% as a waste allowance, so we now have a total of 12.73 cubic yards of concrete.

One cubic yard of concrete costs $137, according to data from the National Ready Mixed Concrete Association (10). This brings the total cost of 12.73 cubic yards of concrete to $1,744.01. 

concrete volmune estimate for 25x25 slab
Concrete volmune estimate for 25×25 slab

We can also compute the cost of a concrete slab on a per-square-foot basis. As mentioned earlier, a 6-inch thick slab costs $6.20 per square foot (1). Since you are building a concrete slab with a total area of 625 square feet, we need to multiply this figure by $6.20. Add the 10% waste allowance to the result, and you will get $4,262 as the total cost. 

Should You DIY or Hire a Contractor for Your 25×25 Concrete Slab Project?

Although you can try making a concrete slab yourself, we do not recommend it. A concrete slab should be durable, especially if it is used to bear heavy loads. When done incorrectly, you might need to redo the slab, increasing the amount of money you need to finance a barndominium. It is best to hire a contractor who can get the job done the first time correctly. 


The ability to compute a concrete slab’s cost is a valuable skill because it can help you ensure that you are not spending too much in making a 25×25 concrete slab. It also lets you determine if a component of your slab is too pricey. If you want to add extra features, you can use the computations above to estimate the budget you need to create a concrete slab successfully.

Follow our Facebook page to access sample floor plans, design ideas, and DIY tips which can be helpful as you build your barndominium, shipping container garage, shouse, and other 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