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How Much Does It Cost to Pour A Concrete Slab?

Last updated: 7th Jun 2019


Businesses that carry out concrete slab work charge an average of $60/m2 for their services. However, the thickness of the slab and the size of the area always affect the cost of the job. Thus, the price goes from $50/m2 to $85/m2.

Where do these prices come from?

All prices stated in this article are based on FY 2018 pricing data compiled by The figures resulted from a comprehensive analysis of quotes submitted by Concreters on the site from July 2016 to July 2017.
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Ray’s concrete slab job in Queensland cost a total of $2,700. This price covered both labour and materials for a nicely finished 9m x 6m concrete slab that served as flooring for a shed.

Meanwhile, Harry paid a total of $1,000 for a 13.5m2 concrete slab in his Queensland property. The slab was for his backyard patio.

How Much Does A Concrete Slab Cost per Square Metre?

Concrete slabs costs range from $50 up to $150 per square metre depending on various factors discussed further in this article. Also, remember to add average labour rates of $60 to these concrete prices when calculating the total cost.

Here’s a short breakdown of the most common costs based on the type of concrete you choose.

What’s the cost of a concrete slab per m2?
Type of concrete Price per m2
spray-on concrete $50 – $75
plain concrete $60 – $85
reinforced concrete $65 – $90
coloured concrete $75 – $90
exposed aggregate finish $100 – $150
decorative stencilled concrete $100 – $150

What Concrete Work Aspects Determine Final Service Costs?

When concreting businesses compute for the final price of a concrete slab, they consider several factors. Some of these are the following.


The size of the area matters greatly as it determines the manpower needed for the job. It also affects the quantity of materials, the truck/s needed for the transport, and the time it will take to set everything up.


How thick or thin you want your slab to be does not only dictate the amount of concrete you need but also the manpower and time needed to complete the job.

Image source Pure Concrete


You can expect the price of the job to go higher if the site is in an area that’s difficult to access as businesses will need additional equipment.


There are different types of concrete slabs, and each of them is best known for certain applications. Of course, they differ in prices too.

  • Ground slab – This solid concrete slab is the most common type of slab.
  • Waffle pod slab – This is similar to the ground slab. The only difference is that waffle pod slabs have trenches.
  • Suspended slab – This type of slab is elevated from the ground. Suspended slabs are mostly used for upper storeys of buildings and houses.

How Much Does It Cost to Pour A 12×12 Concrete Slab?

It would cost $11,520 to pour a 12m x 12m concrete slab according to a calculator estimate. However, the total cost of a project may reach up to $30,000.

That’s because factors such as installation costs for concrete slabs e.g. if the ground is slope, as well as the supplies such as the amount of concrete you need if your project requires a thicker slab than typical, or even the wood used to shape the concrete and other similar factors increase the total cost.

How Much Does It Cost for A 20×20 Concrete Slab?

A large 20m x 20m concrete slab would cost $32,000 to lay whereas the total project cost could be close to $60,000 when every relevant cost factor is taken into account, as previously explained.

For instance, you’ll need at least 40m3 of concrete to lay a slab of these dimensions, which is 100mm thick or deep. When you add the labour rates of $60/m2 for the installation, and consider the other factors determining the total costs, you’ll get to the final figure.

Image source Concept Concrete

How Much Does A Concrete Slab for A Shed Cost?

The cost of a concrete slab for your shed is between $65 and $85 per square metre excluding site works. Check out this video to see how it’s laid and what site works include:

Still, the total cost mainly depends on your shed size. Here’s how much you can expect to pay for concrete slabs based on the shed size:

  • For a very small shed (6m x 7m), a concrete slab costs $3,360 while the total project cost may reach $10,000.
  • For a slightly larger shed (but still quite small, 6m x 9m), $4,320 is the price for a concrete slab only, whereas the whole project may cost up to $15,000 in total.
  • For a mid-sized shed (7m x 14m), expect to pay $7,840 for concrete slabs only and around $23,000 in total (including shed installation).
  • For a large shed (12m x 13m), concrete slabs will cost $12,480, while the whole project in total will be priced approximately $28,800.

If you’re up to installing a new shed, make sure you avoid any mistakes and check out The Complete Concrete Slab Guide For Building Your Ideal Shed for more tips.

How Thick Should A Concrete Slab Be?

The thickness of a concrete slab primarily depends on its use i.e. purpose, but the minimum thickness is 5cm or 2 inches. However, the thicker, the stronger. In residential constructions, 10cm or 4 inches is the standard thickness for a concrete floor slab, for example.

How Thick Does A Concrete Slab Need to Be for A Shed?

For most typical sheds, a concrete slab thickness of 10cm or 4 inches should suffice. Even 7.5 cm (3’’) would be enough for an ordinary garden shed.

However, the thickness should be increased if a slab is poured on soft clay or required for larger buildings. It’s important that half of the base depth is above the ground level.

Image source: Pixabay Images by anaterate

How Thick Does A Concrete Slab Need to Be for A Garage?

For a garage or a driveway, concrete slabs should be thicker to hold a car and other possible heavy loads. The thickness of 15cm or 6 inches is usually strong enough to withstand normal use and average vehicles.

For heavier loads such as trucks or more than one average vehicle, you may want to ensure your concrete slab is no less than 20cm or 8 inches thick because increasing its thickness will boost its load-carrying capacity, not only its price.

How Much Does A Concrete Slab Cost per Square Metre in Australia?

Click the infographic image to expand

At about $50/m2, the average cost of concrete slabs in Western Australia is the most affordable across the country. This is followed by the average price in Queensland and Victoria which is $60/m2. Concreters in New South Wales charge the highest for concrete slabs. Their rate is around $85/m2 on average.

In need of concrete slab experts for your concreting job? Check out’s wide array of trustworthy tradesmen who are ready to lend you a hand.

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Disclaimer: Our cost estimates are based on quotes for concreting services and are useful as a guide only.

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