How Much Does a Concrete Slab Cost?

A concrete slab costs between $100 to $150 per square metre for plain concrete. This base rate applies to standard structural applications such as sheds, garages, or patios. Many projects—especially those involving concreting driveways—may also include decorative or reinforced finishes, which increase the total cost.

In this guide, we’ll explore the key factors that affect slab pricing, average costs by type, and how to calculate your total project budget.

Here are the factors that affect concrete slab cost:

Larger slabs require more concrete, which increases both material and labour costs. Standard residential slabs are usually 100mm thick, while garages or heavier-load areas may require 125mm or more. Thickness plays a big role in determining both price and strength.

Concrete is available in different strength grades, measured in megapascals (MPa). Common mixes include 20 MPa for patios or sheds and 25–32 MPa for garages or structural slabs. Higher MPa mixes are more durable and cost more per cubic metre.

Sites that need levelling, tree removal, or excavation will increase prep time and cost. If the slab is in a hard-to-reach area or machinery access is limited, additional labour and equipment may be required. Flat, open blocks are quicker and cheaper to prepare.

Labour rates in Melbourne range from $60 to $120 per hour. Equipment such as excavators, formwork, and screeding tools also adds to the quote. Delivery logistics and pump hire for harder sites raise the total as well.

Want to know how much does concrete removal cost? Read our guide to see what to expect when replacing or demolishing an existing slab.

Below are the typical costs for each slab type:

Plain concrete slabs cost between $100 to $150 per square metre. This basic option is suitable for shed floors, patios, and general flatwork where function is more important than appearance.

Coloured concrete slabs cost between $110 to $160 per square metre, depending on the oxide pigment used. This upgrade adds visual contrast while keeping the finish smooth and low-maintenance.

Garage slabs also cost between $100 to $150 per square metre, typically using 25 MPa or 32 MPa concrete for added strength. These slabs often include extra reinforcement to support vehicle loads.

Decorative finishes like stamped concrete range from $180 to $300 per square metre, depending on the detail involved. Stamped concrete mimics stone or tile, while exposed aggregate reveals stones for a textured surface. The cost of exposed aggregate driveways also falls within this range when applied to external slabs or paths.

Here are the steps to estimate your concrete slab budget effectively:

Start by measuring the length and width of the space, then multiply to get the total square metres. Multiply this figure by your selected finish’s per m² cost to estimate the slab component.

Extras such as edge thickening, moisture barriers, drainage channels, and sealing can raise the base cost. These features vary by site and purpose but are worth factoring in early during planning.

Get at least 3 itemised quotes that break down material, labour, equipment, and permit fees. Comparing inclusions—not just total price—helps ensure you’re getting value and avoiding hidden costs.