How Much Does a Concrete Slab Cost?
Whether you're building a shed, garage, patio, or even a house extension, pouring a concrete slab is often one of the first and most important steps. But how much does a concrete slab actually cost?
Well, it depends. The total cost of a concrete slab can vary based on a number of factors, including size, thickness, site conditions, and any extra features like reinforcement or finishes.
In this blog, we’ll break down the typical pricing, what affects those costs, and what you can expect when planning a slab project.
Average Cost of a Concrete Slab in Australia
As a general guide, the cost of a concrete slab in Australia ranges from $70 to $120 per square metre. This includes basic excavation, formwork, pouring, and finishing.
Here’s a quick breakdown:
Basic slab (standard finish): $70–$90/m²
Reinforced slab (mesh or bar): $90–$110/m²
Decorative or exposed aggregate finish: $100–$120/m²+
Keep in mind that these are average rates, and actual pricing will depend on the specifics of your job.
What Affects the Cost of a Concrete Slab?
Several factors can influence how much your concrete slab will cost:
1. Size and Thickness
Larger slabs naturally require more materials and labour.
A standard slab is around 100mm thick, but heavier loads may need 150mm or more.
Thicker slabs = more concrete, more steel, and more time.
2. Site Access and Ground Conditions
Is your site flat and easy to access? Great.
If your location is hard to reach, sloped, or requires significant site preparation or excavation, expect additional charges.
3. Reinforcement
Reinforcement such as mesh or steel bars is often required for structural support.
This can add $10–$20/m² depending on the type and layout.
4. Finishes and Features
Standard broom or trowel finish is the most affordable.
If you’re after polished concrete, exposed aggregate, or coloured finishes, it’ll cost more due to the materials and extra labour involved.
5. Formwork and Preparation
Formwork (the wooden or metal barriers used to hold the concrete) and any site prep like compacting the soil, setting drainage, or laying plastic sheeting are typically included—but can add to the price if complex.
Cost Examples for Common Projects
To give you an idea, here’s what a few typical concrete slab projects might cost:
3m x 3m shed slab (basic finish, standard ground): approx. $700–$1,000
6m x 6m garage slab (reinforced): approx. $2,500–$3,500
10m x 4m patio slab (decorative finish): approx. $4,000–$5,500
How to Get an Accurate Concrete Slab Quote
The best way to get an accurate estimate is to speak with a professional. A site inspection can reveal important details about access, drainage, soil conditions, and other factors that impact cost.
Look for a provider that:
Offers transparent, itemised quotes
Has experience with the type of slab you need
Uses high-quality materials and equipment
Why Choose Scavate & Crete?
At Scavate & Crete, we specialise in delivering durable, well-finished concrete slabs for homes, sheds, patios, and commercial use. With years of experience and reliable equipment, we can assess your site and provide a tailored quote that’s honest and competitive—no hidden surprises.
We handle everything from site prep and formwork to pouring and finishing, ensuring your slab is solid, level, and built to last.
Ready to get started on your slab project? Whether you need a small residential slab or a large commercial pour, Scavate & Crete is here to help. Get in touch today for expert advice, competitive pricing, and workmanship you can rely on.
Call us now or visit our website to request a quote. Let’s lay the foundation for your next project the right way.
