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How Much Does a 24×30 Concrete Slab Cost in 2024?

If you are working on a construction project, like building a barndominium, shed, or garage, you will most likely need a concrete slab. This is a versatile structure that can function as a floor, walkway, or driveway. If you are building a structure with a roof deck, a concrete slab roof is necessary to support the weight of your roof deck. A 24×30 concrete slab is just the right size for the workshop floor, a multi-car garage, or a small accessory dwelling unit. 

Before making your concrete slab, it will be best to know how to compute its cost. This knowledge can help you prepare a proper budget to complete the slab without delay due to budget constraints. This article explains what concrete slabs are, the materials you need, and the cost of making one.

What Factors Determine the Cost of a 24×30 Concrete Slab?

The amount of money you need to make a concrete slab depends on several factors. The most important consideration is size. A 24×30 concrete slab gives you a total area of 720 square feet. Size affects the cost because it dictates the amount of materials you need to make one. 

The condition of the site will also determine the cost of a 720-square-foot concrete slab. It would be best if you had a bare and clean area to build a durable slab. If the area has many rocks, bushes, and debris, you must clear it before making the slab. It would be ideal if you also made sure that the site is flat and even. If you cannot handle these tasks yourself, you’ll need a professional’s help, which will cost you money. 

How Much Does a 24×30 Concrete Slab Cost?

Concrete slabs have certain characteristics you need to take note of. Let’s check some of these characteristics and discover how they affect the cost of a concrete slab. 

Per Thickness

Concrete slabs can come in various thickness levels. This is an important characteristic because the thickness of the slab determines its durability. Thickness also determines where you can use a concrete slab. If the slab is for bearing heavy loads, you need to make it thicker. Examples are concrete slabs for driveways and roofs.

Concrete slab floors for pole barn homes and barndominiums need to be thick to support the contents of these structures. Concrete slabs that won’t be bearing enormous weights, like the base of garden benches or pergola floors, can be a bit thinner.

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).


There are basic materials and tools you need to make a concrete slab. We call these inclusions. A reinforcing bar is an excellent example of inclusion. A reinforcing bar or rebar is crucial because it helps form a concrete slab. It can also help minimize cracks and breaks. Rebars are important because they can increase the tensile strength of a slab. 

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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

While most concrete slabs are plain, some have additional features. The added features will depend on how you will use the concrete slab. For example, an exposed concrete aggregate is an excellent flooring choice for the pool’s surrounding area if you have a pool. Exposed concrete aggregate is concrete with the outer layer removed to expose the aggregates within. These aggregates can be pebbles, sand, or small rocks. Exposed concrete aggregate has a rougher texture than smooth concrete, making it less slippery and safer to walk on even when wet.

 If your barndominium’s floor plan has concrete slab flooring, you can stain it to make it look more attractive. Staining is the process of adding color to concrete. It is more expensive and will increase your barndominium’s cost, but it will help increase the value of your barndo. 

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. 

24×30 Concrete Slab Cost Breakdown

Let’s break down the costs of making a 24×30 concrete slab to make it easier to understand. 

Concrete Bag Cost Estimate

This is the base material of a concrete slab and costs between $4.50 and $27 per bag (9). Depending on your supplier, a concrete bag can come in several sizes. There are also several concrete mixture types depending on what you are using it for.  

Labor Cost Estimate

If you do not know how to make a concrete slab, hire a local expert to help you. Depending on your location, expect to pay between $2 and $3 per square foot (10). However, these rates can be higher if you hire a builder with years of professional experience. 

Truck Cost Estimate

If you don’t know how to mix concrete or want to ensure that the concrete gets mixed properly, you can have wet concrete delivered. This will cost between $125 and $133 per cubic yard (11). There are also fuel surcharges if your location is hard to reach or outside the supplier’s service area (9)

How Do You Calculate the Cost of a 24×30 Concrete Slab?

Let’s now compute the cost of a 24×30 concrete slab. We will provide you with several price cost averages to use in calculating the cost in several ways. 

We first need to determine the amount of concrete mix a 6-inch thick 720 square feet concrete slab requires. Using this calculator, you will need 13.33 cubic yards of concrete mixture. We will then add 10% as a waste allowance, so you need 14.67 cubic yards. One cubic yard of concrete costs $137, according to data by the National Ready Mixed Concrete Association (10), so expect to pay $1,985 for 14.67 cubic yards of wet concrete. 

concrete volume estimate for 24x30 slab
Concrete volume estimate for 24×30 slab

Another way is to compute the cost of your 24×30 concrete slab on a per-square-foot basis. We mentioned earlier that the average cost of a concrete slab six inches thick is $6.20 per square foot (1). A 24×30 concrete slab equals 720 square feet, so expect to pay $4,910 for the slab, including the 10% waste allowance. 

Should You DIY or Hire a Contractor for Your 24×30 Concrete Slab Project?

We don’t recommend making a concrete slab yourself, especially if this is your first time. Hiring a contractor may be more expensive, but you are assured that the slab will be durable. Expert builders also work faster, so you can complete your building project quickly.  


Knowing how to compute the cost of any construction project is essential, and concrete slabs are no exemption. When you know how to compute the cost of a 24×30, preparing an accurate budget is easier. It can also help you avoid spending more than what is necessary. You can also use the computations above to compute the cost of other concrete slab sizes. Make sure you follow our Facebook page for more informative articles about barndominium financing, shouses, shipping container homes, 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