Fast, Free & Accurate Concrete Estimates for Perth, WA
Calculate exactly how much concrete you need for any project in Perth — slabs, driveways,
footings, columns, and steps. Get volume in m³, bag count, and 2026 cost estimates instantly.
✅ Slabs & Driveways
✅ Footings & Columns
✅ 2026 Cost Estimates
✅ Bag Calculator
Perth Concrete Volume Calculator
Whether you're pouring a backyard slab, a driveway, or footings for a new structure in Perth,
our free calculator gives you accurate concrete quantities and 2026 price estimates in seconds —
covering the entire Perth metro area from Joondalup to Mandurah.
🏠 Why Use This Calculator?
Over-ordering or under-ordering concrete wastes both money and time. Our Perth concrete
calculator gives you a precise m³ figure so you can confidently order from local WA suppliers —
no guesswork, no costly shortfalls on pour day across Joondalup, Fremantle, Rockingham,
Midland, or the Hills.
📐 Multiple Project Types
From standard rectangular slabs and driveways to round post-hole footings and stepped areas,
the calculator handles the most common residential and commercial concrete scenarios seen
across the Perth metropolitan area and surrounding regions including Mandurah, Bunbury,
and the Perth Hills.
💰 2026 Perth Pricing
Ready-mix concrete in Perth typically ranges from $185 – $270 per m³
in 2026, depending on mix strength, delivery location, and additives. Perth's strong
residential construction market keeps demand — and pricing — consistently active year-round.
🧱 Perth Concrete Calculator
Select your project type, enter dimensions, and get instant results
Enter the longest dimension
Enter the shortest dimension
100 mm = standard slab; 150 mm = driveway
Internal diameter of the column/hole
Total depth of the pour
How many identical columns?
Typical: 150 – 190 mm
Typical: 250 – 300 mm
2026 estimate: $185 – $270/m³ in Perth
Total Concrete Required (with wastage)
0.00 m³
Including selected wastage allowance
Net Volume
—
20 kg Bags
—
25 kg Bags
—
Estimated Cost
—
📋 Full Breakdown
Net concrete volume—
Wastage allowance—
Total volume to order—
Mix strength selected—
20 kg bags needed—
25 kg bags needed—
Estimated material cost—
Est. pump hire (if needed)—
How the Perth Concrete Calculator Works
The calculator uses standard volumetric formulas to determine exactly how much concrete your
Perth project requires. For rectangular pours the formula is straightforward; for round columns
it applies the circular cross-section formula. A wastage factor is then applied to account
for ground variation, formwork gaps, and the practical realities of pouring in Perth's
often sandy, free-draining Swan Coastal Plain conditions.
Tip: Convert thickness from mm to metres before calculating (e.g. 100 mm = 0.10 m)
2026 Concrete Prices in Perth, WA
Perth is serviced by a number of concrete batching plants across the metropolitan area,
including major suppliers operating in the northern and southern corridors. BGC Concrete
is one of WA's largest ready-mix suppliers with plants across the Perth metro. Pricing
varies with delivery distance, mix strength, and the time of year — Perth's strong
construction market keeps demand consistently high.
Mix Strength
Common Use
Price per m³ (AUD)
Min. Order
Slump
N20 (20 MPa)
Paths, garden edging, low-load slabs
$185 – $205
0.2 m³
80 mm
N25 (25 MPa)
House slabs, footpaths, shed floors
$205 – $230
0.2 m³
80 – 100 mm
N32 (32 MPa)
Driveways, garage floors, crossovers
$230 – $252
0.2 m³
100 mm
N40 (40 MPa)
Commercial slabs, structural elements
$252 – $272
0.5 m³
100 – 120 mm
Coloured / Exposed Aggregate
Decorative driveways, patios, pool areas
$268 – $335
1 m³
80 mm
N20 – 20 MPa
Common UsePaths, garden edging
Price per m³$185 – $205
Min. Order0.2 m³
N25 – 25 MPa
Common UseHouse slabs, shed floors
Price per m³$205 – $230
Min. Order0.2 m³
N32 – 32 MPa
Common UseDriveways, garage floors
Price per m³$230 – $252
Min. Order0.2 m³
N40 – 40 MPa
Common UseCommercial / structural
Price per m³$252 – $272
Min. Order0.5 m³
Coloured / Exposed Aggregate
Common UseDriveways, pool surrounds
Price per m³$268 – $335
Min. Order1 m³
⚠️ Price Disclaimer: Prices above are 2026 guide estimates for the Perth metropolitan
area. Always obtain quotes directly from your local Perth concrete supplier as prices vary with
fuel costs, aggregate availability, delivery zone, and seasonal demand. Short loads (under 1 m³)
attract a short-load surcharge from most WA suppliers.
Perth Concrete Project Guide
Different projects in Perth require different thicknesses, mix strengths, and reinforcement.
Perth's Mediterranean climate — hot, dry summers and mild, wet winters — combined with its
predominantly sandy Swan Coastal Plain soils creates a distinct set of concrete challenges.
The guide below covers common residential applications across the Perth metro area.
🏠 Concrete House Slab — Perth
Residential slabs across Perth's Swan Coastal Plain are typically poured on
Class A or S sites (sandy, stable soils) and are commonly
100 mm thick with N25 concrete and SL82 mesh. Perth Hills and
southern suburbs may have clay-rich soils requiring a higher site classification.
Always get a soil test report before specifying your slab — waffle pod slabs are
used on Class M and H reactive sites.
🚗 Concrete Driveway — Perth
Driveways in Perth are a minimum 100 mm thick using N32 concrete for
standard vehicles. Perth's long, dry summers cause significant thermal expansion in
exposed concrete — control joints every 3–4 m are essential. Exposed aggregate and
stencilled concrete finishes are extremely popular in Perth's contemporary residential
streetscapes, especially in newer suburbs like Ellenbrook, Alkimos, and Byford.
🏗️ Footings & Foundations
Strip footings in Perth's sandy coastal soils are typically 300 mm wide × 200 mm deep
with N25–N32 concrete and R10 tie bars for single-storey construction. In sandy areas with
low bearing capacity — common near the coast from Scarborough to Cottesloe — deeper footings
or pad footings may be required. Always consult a structural engineer or building certifier
before ordering concrete for footings.
🏊 Pool Surrounds & Alfresco
Outdoor entertaining areas and pool surrounds are essential features of Perth homes,
given the city's 3,000+ sunshine hours per year. These are typically poured at
100 mm thick with N25 or N32 concrete and an exposed aggregate or
brushed finish for slip resistance. Use our slab calculator to get an accurate volume
estimate for any alfresco or pool deck project.
🔵 Post Holes & Columns
Pergola, carport, and fence post footings in Perth typically use 300–450 mm diameter holes
at 600–800 mm depth with N25 concrete. On the Swan Coastal Plain's sandy soils, footings
may need to be deeper to reach adequate bearing capacity — especially for heavy pergola
or patio structures. Our column calculator handles any combination of size and quantity instantly.
🪜 Concrete Steps
Concrete steps in Perth follow the NCC standard of 150–175 mm rise
and 250–300 mm run. Given Perth's hot, sunny summers, steps should
be finished with a broom texture or exposed aggregate to prevent the surface from
becoming dangerously hot and slippery. N32 concrete is recommended for all external
steps exposed to Perth's UV-intense conditions.
Recommended Concrete Thickness — Perth Projects
Project Type
Thickness (mm)
Mix Strength
Reinforcement
Wastage %
Footpath / Garden path
75 – 100
N20
Optional SL72 mesh
5 – 10%
Patio / Alfresco
100
N25
SL82 mesh
10%
Pool surround
100
N25 – N32
SL82 mesh
10%
House slab (Class A/S)
100
N25
SL82 / SL92
10%
House slab (Class M/H)
Engineer specified
N32+
Engineer specified
10%
Garage / shed floor
100 – 125
N32
SL92 mesh
10%
Driveway (light vehicles)
100 – 125
N32
SL92 mesh
10%
Driveway (heavy vehicles)
150 – 175
N40
N12 bar
10 – 15%
Strip footing
200+
N25 – N32
R10 tie bars
10%
Footpath / Garden Path
Thickness75 – 100 mm
MixN20
Wastage5 – 10%
Patio / Pool Surround
Thickness100 mm
MixN25 – N32
Wastage10%
House Slab (Class A/S)
Thickness100 mm
MixN25
Wastage10%
Driveway (light vehicles)
Thickness100 – 125 mm
MixN32
Wastage10%
Strip Footing
Thickness200+ mm
MixN25 – N32
Wastage10%
Concrete Pouring Tips for Perth Conditions
☀️ Perth Climate Note: Perth has one of Australia's hottest and driest climates —
summers regularly exceed 40°C with very low humidity. Unlike humid eastern states, Perth's dry
heat causes extremely rapid surface moisture evaporation from fresh concrete. This is one of
the most challenging environments in Australia for concrete curing and requires careful planning.
Extreme summer heat (Perth summers): Perth regularly records temperatures over 40°C in December through February — some of the most challenging concrete pouring conditions in Australia. Low humidity means moisture evaporates from fresh concrete very rapidly. Pour before 7 AM, use a set retarder admixture, wet the formwork and sub-base before pouring, and apply a curing compound or wet hessian immediately after finishing. Avoid pouring on days above 38°C where possible.
Wind is a major risk: Perth's notorious Fremantle Doctor (afternoon sea breeze) and strong easterly winds can strip moisture from fresh concrete extremely quickly, causing plastic shrinkage cracking. Use windbreaks where possible and cure aggressively on windy days regardless of temperature.
Sandy sub-base preparation: Perth's Swan Coastal Plain soils are predominantly sand with low bearing capacity. Always compact the sub-base thoroughly before pouring and use a vapour barrier (polythene sheet) under slabs to prevent moisture migration from the slab into the sandy base — a common cause of premature drying and cracking.
Winter pouring in Perth: Perth winters are mild (rarely below 5°C) compared to eastern Australia, making June–August an excellent window for larger concrete pours. Cooler temperatures extend your working time significantly. Mornings can be frosty in the Perth Hills — check temperatures before pouring in elevated eastern suburbs.
Control joints: Perth's dramatic temperature swing between 40°C+ summers and 8°C winter nights makes thermal expansion a significant issue. Install saw-cut or formed control joints at maximum 3–4 m spacings on all residential slabs and driveways.
Ordering concrete in Perth: Perth has an active residential construction market — order at least 48 hours ahead. Peak building seasons (spring and early summer) can see supplier lead times extend. Short loads under 0.5 m³ will incur a surcharge with most Perth suppliers.
Pump hire in Perth: Concrete pump hire in Perth typically costs $450 – $900 depending on boom size and delivery location. Standard line pumps cost less than boom pumps — discuss options with your Perth supplier based on your site access.
✅ Perth Pro Tip: For any Perth concrete pour over 3 m³, always use ready-mix from
a local batching plant. In Perth's extreme summer heat, maintaining a consistent mix temperature
is critical — ask your supplier about chilled water or ice admixtures for pours scheduled during
Perth heatwave conditions above 38°C. All structural pours must meet AS 1379
compliance — confirm this with your supplier when ordering.
Planning to build a new basement or lower-level access point on a Perth Hills property?
Use our Basement Access Ramp Calculator
to accurately estimate the concrete needed for ramps, retention walls, and access structures.
Concrete Bag Coverage Reference — Perth
For very small jobs in Perth where ready-mix concrete isn't practical — such as a single post
hole or a minor repair — pre-mixed bags available at Bunnings or Mitre 10 are an option.
The table below shows bag yields and costs compared with ready-mix.
Bag Size
Yield per Bag (m³)
Bags per 1 m³
Approx. Price per Bag (AUD)
Cost per m³
20 kg bag
0.009 m³
~111 bags
$8 – $12
~$900 – $1,320
25 kg bag
0.011 m³
~91 bags
$10 – $15
~$910 – $1,365
40 kg bag
0.018 m³
~56 bags
$16 – $22
~$896 – $1,232
20 kg Bags
Yield per bag0.009 m³
Bags per m³~111 bags
Cost per m³~$900 – $1,320
25 kg Bags
Yield per bag0.011 m³
Bags per m³~91 bags
Cost per m³~$910 – $1,365
40 kg Bags
Yield per bag0.018 m³
Bags per m³~56 bags
Cost per m³~$896 – $1,232
💡 Bagged vs Ready-Mix in Perth: Bagged concrete costs roughly 4× more per m³
than ready-mix from a Perth batching plant. For any pour over 0.5 m³,
ready-mix is strongly recommended for both quality and cost. Note that in Perth's extreme
summer heat, hand-mixing bags is also physically much harder — another reason to choose
ready-mix for larger pours.
Select your project type (slab, driveway, footing, column, or steps), enter your dimensions in metres or millimetres as prompted, choose your wastage allowance and mix strength, then click Calculate. The tool instantly shows total m³ required, 20 kg and 25 kg bag quantities, and an estimated cost based on 2026 Perth pricing. You can adjust the price per m³ to match a quote from your local Perth supplier.
How much does concrete cost in Perth in 2026?
Ready-mix concrete in Perth ranges from approximately $185/m³ for N20 mix to $272+/m³ for N40 structural concrete in 2026. Decorative and exposed aggregate concrete can reach $335/m³. These prices exclude pump hire ($450–$900) and finishing labour. Always obtain a current quote from your local Perth or metro-area supplier — BGC Concrete and other local suppliers service the full Perth metropolitan area.
What soil type does Perth have and how does it affect concrete?
The majority of Perth's metropolitan area sits on the Swan Coastal Plain, which consists predominantly of sandy soils classified as Class A or S under AS 2870. These are generally well-drained and stable, meaning standard slab designs are usually sufficient for most of Perth's coastal suburbs. However, Perth Hills areas (Kalamunda, Mundaring, Armadale) can have different soil profiles including clay or rocky ground. Always get a soil test for any structural slab — your engineer or building certifier will advise on the correct slab design for your specific Perth location.
What is the best time of year to pour concrete in Perth?
The best time to pour concrete in Perth is during the winter months — June, July, and August. Perth's mild winters (daytime temperatures around 18–20°C) provide ideal curing conditions with no risk of frost in the metro area, manageable humidity, and no extreme wind or heat. Spring (September–October) and autumn (March–May) are also good. Avoid pouring during December through February heatwaves when temperatures regularly exceed 38–40°C, and never pour concrete on days with forecast temperatures above 35°C without experienced supervision and hot-weather admixtures.
Do I need a building permit for a concrete slab in Perth?
In Western Australia, a building permit is generally required for slabs associated with new structures such as sheds, garages, carports, and house additions. The requirement depends on the size, value, and nature of the work. Small standalone pathways and garden slabs under certain thresholds may be exempt under the Building Act 2011 (WA). Always check with your local council (City of Perth, City of Stirling, City of Joondalup, etc.) or a registered WA building surveyor before commencing any concrete work to ensure compliance.
How do I handle concrete curing in Perth's dry summer heat?
Curing concrete in Perth's summer is one of the most challenging aspects of WA construction. As soon as the concrete surface can support foot traffic (typically 4–8 hours after pour in summer), apply a chemical curing compound or cover with wet hessian and keep moist for a minimum of 7 days. Never allow the surface to dry out during this period. In extreme heat (38°C+), begin wet curing immediately after finishing is complete. Consider using polypropylene fibres in the mix to reduce plastic shrinkage cracking — ask your Perth supplier about this option.
How much wastage should I add to my Perth concrete order?
A 10% wastage allowance is standard for most residential Perth projects. For Perth's sandy sub-base, ensure the ground is properly compacted before pouring — loose sand can shift and create voids that consume extra concrete. For complex pours with stepped formwork or uneven terrain (common in Perth Hills properties), use 15%. For simple, well-prepared flat slabs on Perth's Swan Coastal Plain, 5–8% may be adequate. Running short mid-pour is always more costly than ordering a little extra.
How many 20 kg bags of concrete do I need per m³ in Perth?
You need approximately 110–111 bags of 20 kg pre-mixed concrete per cubic metre (m³). Each 20 kg bag yields roughly 0.009 m³ when mixed with the correct water ratio. Our Perth concrete calculator automatically displays the 20 kg bag count in the results — simply enter your project dimensions and wastage percentage to get the exact bag quantity needed. Remember that in Perth's summer heat, mix water quickly and work in the shade when hand-mixing bags.
Check building permit requirements, planning regulations, and development guidelines
before starting any concrete project in the City of Perth or surrounding WA councils.
The Australian Standard for specification and supply of concrete. Ensure your
Perth supplier provides AS 1379 compliant ready-mix for all structural residential
and commercial pours in WA.
Always check the Bureau of Meteorology Perth forecast before scheduling your pour —
critical during Perth's extreme summer heat, high-wind days (Fremantle Doctor),
and rare winter frost events in Perth Hills.
Technical guides on concrete mix design, hot-weather curing, sandy sub-base
preparation, and best practices for residential and commercial construction
across Western Australia.
