$75–$90 per m²
Usually suited to straightforward small slabs on accessible, mostly level sites with simple preparation.
Concrete Cost Guide • Slabs, Shed Slabs, Garage Slabs & House Slabs
Concrete Slab Cost in Australia
Concrete slabs in Australia commonly cost around $75 to $110 per square metre for a standard residential slab. The final price can sit outside that range depending on slab thickness, reinforcement, excavation, site access and what the slab needs to support.
This guide explains how slab pricing works, what changes the quote, and why two slabs with the same size can still cost different amounts.
How much does a concrete slab cost in Australia?
A standard concrete slab usually costs about $75 to $110 per m². A simple slab on a flat, accessible site may sit near the lower end. A thicker, reinforced, engineered or hard-to-access slab can cost $110 to $150+ per m².
Simple pricing rule: the slab’s job matters as much as its size. A patio slab, garage slab and house slab can all be the same area, but they may need different thickness, reinforcement, base preparation and finish standards.
$90–$110 per m²
A common planning range for residential slabs where normal preparation, formwork and reinforcement are required.
$110–$150+ per m²
More likely when the slab is reinforced, engineered, thicker, difficult to access or needs extra excavation.
These figures are broad Australian guide prices. Always compare quotes based on the same slab size, thickness, reinforcement, preparation, concrete strength and inclusions.
Concrete slab cost per m²
Per-square-metre pricing is useful for a first estimate, but it does not tell the whole story. A slab quote is usually built from area, concrete volume, preparation, reinforcement, labour, access and project risk.
| Slab category | Typical guide price | What usually affects the range |
|---|---|---|
| Small basic slab | $75–$90 per m² | Simple shape, flat site, easy access and limited excavation. |
| Standard residential slab | $90–$110 per m² | Normal formwork, base preparation, steel mesh and residential use. |
| Reinforced or thicker slab | $110–$150+ per m² | Vehicle loads, thickened edges, stronger concrete, engineering or heavier reinforcement. |
| Decorative or specialised slab | $150+ per m² | Decorative finish, exposed aggregate, detailed surface work or complex site conditions. |
Estimated slab cost = slab area × price per m²
For example, a 30 m² slab at $95 per m² would be about $2,850 before site-specific extras. That estimate may change if the job needs excavation, old concrete removal, a concrete pump, drainage preparation, thicker concrete or extra steel.
For a broader pricing breakdown, read our guide to concrete cost per m² in Australia.
Concrete slab cost by project type
The intended use of the slab is one of the biggest pricing factors. A small shed slab and a garage slab might both look simple, but the garage slab needs to handle vehicle loads and may need stronger preparation.
| Slab type | Price behaviour | Why the cost changes |
|---|---|---|
| Shed slab | Usually lower to moderate | Often smaller and simpler, but still needs a compacted base, formwork and suitable thickness. |
| Patio slab | Moderate | Drainage, levels, finish and connection to the house can affect preparation and labour. |
| Garage slab | Moderate to high | Vehicle loads, slab thickness, reinforcement and edge strength become more important. |
| Driveway slab | Moderate to high | Access, slope, crossover, finish, drainage and vehicle use can raise the price. |
| House slab | High | Usually needs engineering, soil consideration, plumbing penetrations and strict tolerances. |
| Extension slab | Often higher than expected | Existing structures, demolition, tight access and tie-ins can increase labour. |
Cost comparison tip: do not judge a slab by area alone. A 30 m² patio slab and a 30 m² garage slab may need different base preparation, reinforcement, thickness and edge details.
Slab cost comparison by use
This visual guide shows how pricing pressure usually increases as the slab needs to carry more load, meet tighter tolerances or deal with harder site conditions.
These are guide ranges only. House slabs, engineered slabs and structural slabs should be priced from plans, soil information and site requirements.
What affects the cost of a concrete slab?
The concrete itself is only one part of the job. A durable slab depends on excavation, base preparation, compaction, formwork, reinforcement, concrete placement and curing. The cheapest quote is not always the best value if those steps are unclear.
Large slabs can have a lower m² rate
Bigger slabs often spread setup time, travel, equipment and ordering costs across more area. Small jobs may have a higher effective m² rate because the contractor still has to set up properly.
More depth means more concrete
A thicker slab uses more concrete and may need stronger reinforcement. The right thickness depends on the slab’s purpose, not just the owner’s budget.
Steel adds cost, but may be necessary
Steel mesh, reinforcing bars and thickened edges can increase the quote. They may also be essential for load, movement control and long-term performance.
The base controls the result
Excavation, levelling, compacted base material and drainage preparation can change the price more than people expect.
Tight access adds labour
If the truck cannot reach the pour area, the job may need wheelbarrow work, extra labour or a concrete pump.
A basic slab is not a decorative floor
A simple screeded slab is different from a slab designed for polishing, exposed aggregate, coloured concrete or a very smooth finish.
Example concrete slab cost estimates
These examples show why area-based estimates are useful for planning, but not enough for a final quote.
| Example project | Size | Rough calculation | What may change the final quote |
|---|---|---|---|
| Small garden shed slab | 3m × 3m = 9 m² | 9 m² × $90 = $810 | Small jobs may cost more than the area suggests because of minimum labour, setup, delivery and formwork. |
| Patio slab | 5m × 4m = 20 m² | 20 m² × $95 = $1,900 | Drainage, levels, site preparation, access and finish can change the total. |
| Garage slab | 6m × 6m = 36 m² | 36 m² × $110 = $3,960 | Vehicle loads, reinforcement, thickened edges and engineering can increase the price. |
| Larger residential slab | 100 m² | 100 m² × $110 = $11,000 | Soil conditions, plumbing penetrations, engineering, pumping and excavation can have a large impact. |
Estimate warning: these examples do not replace a site quote. Real pricing may include excavation, base preparation, reinforcement, concrete pumping, old concrete removal, waste disposal, engineering and GST.
Why small concrete slabs can cost more than expected
A small slab is not always cheap when measured by the square metre. The contractor still needs to inspect the site, prepare the area, build formwork, organise materials, place the concrete, finish the surface and clean up.
This is why a 9 m² shed slab may not simply cost 9 multiplied by the lowest published m² rate. Minimum labour, travel, ordering, setup time and access can push the effective rate higher.
Practical takeaway: m² pricing works best for rough planning. For small slabs, compare the total job price and the inclusions rather than trying to force the quote into a neat square-metre rate.
Cheap concrete slab quotes: what to check before accepting
A cheaper quote may be fine for a simple slab, but it can also mean important work has been left out. Compare the details before comparing the final number.
Quote inclusions to check
- Excavation and site preparation
- Compacted base material
- Slab thickness
- Concrete strength
- Steel mesh or reinforcement
- Formwork
- Concrete pump hire if needed
- Waste removal
- GST
Warning signs in a quote
- No clear slab thickness
- No detail about reinforcement
- Preparation described vaguely
- No mention of access constraints
- Exclusions hidden in small print
- Very low price compared with other quotes
- No explanation of curing or finish expectations
- No clear process for changes or extras
Quote comparison tip: ask each contractor to price the same slab specification. If one quote includes excavation, reinforcement and clean-up while another only covers the pour, the cheaper number may not be cheaper in the end.
To understand how a proper quote should be built, read our guide to how concrete quotes are prepared.
Repairing, replacing or pouring a new slab
If you already have concrete in place, a full new slab may not always be needed. Surface wear, small cracks or minor edge damage may be repairable. A slab that has moved, sunk, cracked badly or failed because of poor base preparation may need replacement.
The cause of the damage matters. Cosmetic patching may not solve cracking caused by movement, poor drainage, tree roots, soft ground or slab settlement.
- Minor cracks
- Small surface defects
- Local edge damage
- Wear that has not affected the slab base
- Major movement
- Large structural cracking
- Sinking or uneven levels
- Failed base preparation
If the existing concrete needs attention first, view our concrete repairs service. You can also read our guide on how long concrete lasts.
Why slab preparation matters as much as the concrete
Concrete strength matters, but the slab underneath and around it matters too. A good slab depends on the right excavation depth, stable base, compaction, formwork, reinforcement placement, concrete curing and drainage.
Poor preparation can lead to cracking, movement, drainage issues, uneven surfaces and early failure. In many cases, the expensive problem is not the concrete itself. It is what was skipped before the pour.
Preparation verdict: a slab is only as reliable as the ground, base and reinforcement supporting it.
For more detail, read our concrete preparation standards and concrete work methodology.
What can make a slab cost more?
The base price can rise quickly when the site is not straightforward.
| Cost factor | Why it adds cost | What to ask |
|---|---|---|
| Sloped ground | More excavation, fill, formwork and level control may be needed. | Does the quote include levelling and base preparation? |
| Tight access | May require extra labour, wheelbarrow work or pumping. | Can the concrete truck reach the pour area? |
| Old concrete removal | Demolition, cutting, loading and disposal add labour and tipping costs. | Is removal and disposal included? |
| Reinforcement | Steel mesh, bars and thickened edges increase material and labour. | What reinforcement is included? |
| Engineering | Structural slabs may need design requirements followed closely. | Is the slab being priced from plans? |
| Drainage | Falls, channels or surrounding water issues can affect preparation. | How will water move away from the slab? |
How to get a more accurate concrete slab quote
A contractor can price the job more accurately when the basic details are clear. Before requesting a quote, measure the area, take photos and think about what the slab will support.
Have these details ready
- Approximate slab length and width
- Intended use of the slab
- Photos of the site
- Access details
- Whether old concrete needs removal
- Whether the site is flat or sloped
- Any engineering plans
- Preferred finish if known
Ask the contractor
- What slab thickness is allowed for?
- What concrete strength is being used?
- Is reinforcement included?
- Is excavation included?
- Is concrete pumping included if needed?
- How will the base be prepared?
- What finish is included?
- What is excluded from the quote?
Does location affect concrete slab cost?
Location can affect labour, travel, access, supplier availability, soil conditions, disposal costs and the availability of concrete contractors.
Sydney
Dense suburbs, limited access, demolition work and older properties can affect slab pricing. View our concrete slabs Sydney page.
Melbourne
Site access, drainage, clay soils and renovation conditions can change preparation needs. View our concrete slabs Melbourne page.
Brisbane
Weather, slope, drainage and outdoor living projects can affect slab design and timing. View our concrete slabs Brisbane page.
Adelaide
Heat, dry conditions and ground preparation can affect the pour and curing process. View our concrete slabs Adelaide page.
For broader service coverage, visit the locations hub.
Related concrete cost guides
These guides help connect slab pricing to driveway costs, finish choices, repairs and broader concrete budgeting.
Concrete Cost Per m² Australia
Understand how concrete pricing changes by finish, preparation, thickness and project type.
Concrete Driveway Cost Australia
Compare driveway pricing, finishes, preparation, replacement costs and site factors.
Concrete Cutting Cost
Learn how saw cutting, cut depth, access, reinforced concrete and disposal can affect price.
Concrete Repair Cost
Compare crack repair, resurfacing, patching and replacement considerations.
Frequently asked questions
How much does a concrete slab cost per square metre in Australia?
A standard concrete slab in Australia commonly costs around $75 to $110 per square metre. More complex, reinforced, decorative or hard-to-access slabs may cost $110 to $150+ per square metre.
How much does a 6m x 6m concrete slab cost?
A 6m x 6m slab is 36 m². At $90 to $110 per m², the rough cost would be around $3,240 to $3,960 before extra costs such as excavation, reinforcement, pumping, disposal or difficult access.
Is a shed slab cheaper than a house slab?
Usually, yes. A shed slab is often simpler than a house slab, although it still needs suitable thickness, reinforcement and base preparation. A house slab usually involves engineering, plumbing, structural requirements and stricter tolerances.
What is the cheapest concrete slab?
A basic plain concrete slab on a flat, accessible site is usually the cheapest. The price rises when the slab needs excavation, reinforcement, thicker concrete, pumping, decorative finishing or difficult access.
Why do concrete slab quotes vary so much?
Quotes vary because different contractors may include different items. One quote might include excavation, formwork, reinforcement and clean-up, while another may only cover the pour. Always compare the inclusions, not just the final number.
Can I pour a concrete slab myself?
Small non-structural slabs may be possible for experienced DIYers, but structural slabs, garage slabs, driveways and house slabs should be handled by qualified professionals. Mistakes in levels, reinforcement, drainage or curing can be expensive to fix.
Does slab thickness affect the cost?
Yes. Thicker slabs use more concrete and may need more reinforcement, stronger preparation and additional labour. The right thickness depends on the intended use of the slab.
Is concrete slab cost quoted per m² or per m³?
Many residential slab quotes are discussed per square metre, but concrete supply is often measured by cubic metre. The finished price should also include labour, preparation, formwork, reinforcement, access and finishing.
Plan the slab around the job it needs to do
A good concrete slab quote should match the slab’s purpose, not just its size. Before choosing the cheapest price, check the thickness, reinforcement, preparation, access requirements and quote inclusions.
If you are planning a shed slab, patio slab, garage slab, driveway slab or residential slab, our team can help you compare the practical requirements before work begins.