Concrete Slab Cost per Square Metre in Australia 2026

Whether you're pouring a shed slab out the back, laying the foundation for a new house or putting down a patio you can actually use year-round, the first question is always the same: how much per square metre? The short answer for 2026 sits between $50 and $150 per m² for a standard residential slab — but the real number depends on thickness, reinforcement, site prep and the type of finish you're after.

This guide breaks down exactly what you'll pay across different slab types in Australia right now, from a basic 100mm shed slab through to a 200mm reinforced house slab with edge beams. We'll cover the cost differences between mesh and rebar reinforcement, how the finish affects your bottom line, and what your concreter is actually charging for. If you want a number right now, try the free concrete slab cost calculator — plug in your area and thickness and you'll have a ballpark in 30 seconds.

Concrete prices across Australia have steadied through 2025 and into 2026 after a couple of volatile years. Cement and aggregate costs have levelled off, but labour — particularly for experienced concreters who can pour, screed and finish properly — remains in strong demand. Knowing what each component costs puts you in a much better position when quotes start landing in your inbox.

Concrete slab cost by type

Not all slabs are the same job, and the price per square metre reflects that. Here's what you can expect to pay across the most common slab types in Australia in 2026:

A straightforward 6m x 4m shed slab on flat ground with SL72 mesh and a broom finish is the cheapest you'll get — most concreters will quote this between $1,200 and $2,000 all up. A full house slab with edge beams, rebar, waffle pods and engineering is a completely different beast.

Important note: these are guide prices only. Your concreter will confirm the final price after inspecting the site — ground conditions, access and fall all affect the quote.

How thickness affects cost per square metre

Thickness is one of the biggest cost levers. More concrete means more material, more reinforcement and a heavier pour — which means more labour. Here's how thickness affects the per-m² rate for a standard residential slab with mesh reinforcement:

Going from 100mm to 150mm adds roughly 50% more concrete volume, but the per-m² cost increase is usually 30–40% because the labour component (boxing, pouring, finishing) doesn't scale linearly. That said, pouring thicker does take longer to screed and finish, so you'll pay a bit more for the extra time.

For most shed and patio slabs, 100mm is the standard and it's plenty. Garages where you're parking a vehicle should be 150mm minimum — a loaded 4WD or trailer puts real pressure on a thin slab, especially at the edges. House slabs are engineered to specific thicknesses and aren't something you can choose to skimp on — your structural engineer specifies what's required based on soil classification and building loads.

If you're weighing up your options, the concreting quote calculator lets you compare different thicknesses side by side.

Reinforcement: mesh vs rebar and what it costs

Reinforcement keeps your slab from cracking under load and movement. There are two main options, and the choice between them affects both cost and performance:

Mesh (welded wire fabric) comes in sheets and is quick to lay — your concreter rolls it out on bar chairs, ties the sheets together and it's ready for the pour. It's the standard for sheds, patios and basic garage slabs. SL72 is the most common for residential work, and SL82 is a step up for anything carrying vehicle loads.

Rebar (deformed steel bar) is stronger and specified for structural slabs — house foundations, slabs with edge beams and anything designed by an engineer. It takes longer to tie and position, which is why the labour cost is higher. For a house slab, rebar in the edge beams and mesh in the internal panels is a common combination.

Your engineer's design determines what reinforcement goes where on a house slab. For non-structural slabs like sheds and patios, your concreter will recommend the right mesh grade based on the intended use.

Finish types and their impact on price

The finish on top of your slab affects both the look and the cost. Here's what each option adds per square metre:

A basic broom finish is included in every concreter's standard rate — it's the default because it's quick and gives you a non-slip surface that works for just about any outdoor application. If you're pouring a garage floor you want to keep clean, a steel-trowelled finish is worth the extra $5–$15 per m² for a surface that's easier to sweep and hose down.

Exposed aggregate and stamped concrete are decorative finishes more commonly used for driveways, patios and pool surrounds. They look great but the cost per square metre jumps significantly. If you're considering a decorative driveway, the driveway concreting quote calculator will give you a better estimate for those options.

Want a quick comparison for your project? Try the concrete slab cost calculator — adjust thickness, area and finish to see how the total changes.

What else affects your total slab cost

Beyond the slab itself, there are a few extras that can shift the total bill:

Site preparation

• Excavation and levelling — if your site isn't flat, earthworks are needed before the slab goes down. Expect $20–$50 per m² for cut and fill on sloping sites.
• Compacted base — a layer of crushed rock (typically 100mm of roadbase or blue metal) needs to be compacted under the slab. This runs $15–$30 per m² including supply and compaction.
• Vapour barrier — a plastic membrane under the slab stops moisture coming up from the ground. Standard on house slabs, optional on sheds. Adds $3–$8 per m².

Formwork and boxing

Timber formwork around the perimeter holds the wet concrete in shape. For simple rectangular slabs, this is included in most quotes. Curved edges, multiple levels or complex shapes add cost — typically $20–$40 per lineal metre for custom formwork.

Concrete pump hire

If the truck can't back right up to the pour site, you'll need a concrete pump. Line pumps run $400–$800 for a standard residential pour, and boom pumps (for larger or hard-to-access pours) start at $1,000. Your concreter will tell you if a pump is needed based on site access.

Engineering and certification

House slabs require a soil test and structural engineering design before anything gets poured. Budget $1,500–$3,500 for the soil report, engineering drawings and council certification. Shed and patio slabs generally don't need engineering unless your council requires it.

For a full picture of what different concreting jobs cost, browse the concreting calculators page.

How to get the best value on your concrete slab

Concrete work is one of those trades where the cheapest quote is rarely the best value. A poorly poured slab cracks, sinks at the edges and costs twice as much to fix. Here's how to get a good result without overpaying:

• Get three written quotes — compare them line by line. Look at what's included in the per-m² rate (formwork, mesh, base prep, finish) and what's listed as extras.
• Check the concrete strength — standard residential slabs use 25 MPa (N25) concrete. Some concreters quote 20 MPa to keep the price down, but it's weaker and more prone to surface wear. For driveways and garages, 32 MPa is better.
• Ask about bar chairs — reinforcement mesh needs to sit in the middle or top third of the slab, not on the ground. If the mesh sinks to the bottom during the pour, it does nothing. Good concreters use proper bar chairs and tie the mesh down.
• Pour in the right conditions — avoid pouring in extreme heat (above 35°C) or when rain is forecast. Hot pours crack, and rain washes the surface finish. A good concreter will reschedule rather than pour in bad conditions.
• Don't skimp on the base — a well-compacted crushed rock base is what stops your slab from cracking and sinking over time. This is not the place to save money.

For more options across construction and building projects, check the full range of calculators to estimate individual trade costs before you commit.

Frequently asked questions

Q: How much does a concrete slab cost per square metre in Australia?

A: In 2026, a standard concrete slab costs between $50 and $150 per square metre in Australia, depending on thickness, reinforcement and finish. A basic 100mm shed slab with mesh sits at the lower end ($50–$85/m²), while a 200mm reinforced house slab with edge beams and engineering sits at the upper end ($90–$150/m²). These prices include concrete supply, labour, formwork, mesh and a broom finish.

Q: How much does a shed slab cost in Australia?

A: A typical shed slab (100mm thick, SL72 mesh, broom finish on flat ground) costs $50–$85 per m² in 2026. For a standard 6m x 4m shed, that's roughly $1,200–$2,040 all up. Add $200–$500 for base preparation if the ground needs levelling and compacting. Larger sheds (6m x 9m and up) get a slightly better per-m² rate because the fixed costs spread further.

Q: What thickness concrete slab do I need?

A: For sheds, patios and pathways, 100mm is the standard. Garages and carports should be 150mm to handle vehicle loads. House slabs are specified by an engineer based on soil conditions and building loads — typically 100–110mm with waffle pods or 150–200mm for raft slabs. Going too thin saves money upfront but leads to cracking, especially at edges and joints.

Q: Is mesh or rebar better for a concrete slab?

A: Mesh (welded wire fabric) is fine for non-structural slabs like sheds, patios and garages. It's cheaper and faster to install. Rebar is stronger and used for structural slabs — house foundations, slabs with edge beams and anything carrying heavy or dynamic loads. Most house slabs use a combination: rebar in the edge beams and mesh in the internal panels. Your engineer's design determines what's required.

Q: How much does exposed aggregate concrete cost per m²?

A: Exposed aggregate adds $25–$50 per m² on top of the base slab cost. For a standard 100mm slab, you're looking at $75–$135 per m² total with an exposed aggregate finish. The extra cost covers the decorative aggregate in the mix, the wash-off process to expose the stones, and a sealer coat. It's a popular choice for driveways and outdoor entertaining areas across Australia.

Q: Do I need a permit for a concrete slab?

A: For a basic shed slab, patio or driveway, most Australian councils don't require a permit — but check with your local council first because rules vary by state and municipality. House slabs always require a building permit, soil report and structural engineering. Some councils also require permits for sheds over a certain size (typically 10m²) or in bushfire-prone areas.

Q: How long does a concrete slab take to cure?

A: Concrete reaches functional strength (you can walk on it) within 24–48 hours and working strength (suitable for building on or parking vehicles) at 7 days. Full design strength is reached at 28 days. During the first 7 days, the slab should be kept moist — your concreter may use curing compound or advise you to wet it down regularly. Don't park heavy vehicles or start building on the slab until at least 7 days after the pour.

Q: How can I get an accurate concrete slab cost estimate?

A: The fastest way is to use the concrete slab cost calculator, which factors in your slab area, thickness, reinforcement type and finish. It gives you an itemised estimate in under a minute. It's not a binding quote — your concreter will confirm the final price after inspecting the site — but it gives you a solid starting point for budgeting and comparing quotes.

Get your numbers sorted before you pour

A concrete slab is one of those jobs where getting it right the first time matters more than almost anything else on a build. You can't patch a slab that's too thin, fix mesh that sank to the bottom, or level a slab that was poured on uncompacted fill without ripping the whole thing up and starting again. The cost of doing it twice is always more than the cost of doing it properly once.

Start with the type of slab you need and the area you're covering. Figure out the right thickness for the intended use, decide on the finish and reinforcement, and then get your three quotes. Compare them on inclusions — a $70/m² quote that doesn't include base prep, mesh or formwork isn't cheaper than an $85/m² quote that includes everything.

If you're still early in the planning stage, the Leadkit calculators are a good place to start estimating costs across the full scope of your project.

Want an instant price estimate? Use the free concrete slab cost calculator — takes 30 seconds, no signup.