Total Concrete Required
0.00 m³
Including wastage allowance
Instant concrete volume, bag count & cost estimates for Wollongong projects
Plan your slab, driveway, footing or column pour with confidence. Our free Wollongong concrete calculator delivers accurate m³ results and 2026 local pricing for Wollongong, the Illawarra and surrounding regions of NSW.
Accurate concrete calculations for residential and commercial projects across Wollongong, Shellharbour, Kiama, Dapto and the greater Illawarra region of NSW
Enter your dimensions and get exact cubic metre (m³) volumes instantly. Our Wollongong concrete calculator accounts for slab thickness, footing depth and wastage allowances so you never over- or under-order concrete for your Illawarra residential or commercial project.
Get realistic cost estimates based on current 2026 ready-mix concrete prices in Wollongong, NSW. Compare bagged concrete versus truck-delivered mixes and plan your project budget accurately before approaching local Wollongong concrete suppliers or licensed concreters.
Whether you are pouring a driveway in Figtree, footings for a new home in Dapto, an alfresco slab in Thirroul or a retaining wall footing in the Illawarra Escarpment suburbs, this calculator handles slabs, strip footings, pad footings and circular columns with full accuracy.
Select your pour type and enter dimensions to calculate concrete volume and 2026 Wollongong cost estimate
Typical Wollongong residential concrete slab showing length, width, depth, timber formwork, vapour barrier, compacted crushed rock sub-base and SL mesh reinforcement — suited to Illawarra clay and shale soil conditions
The Wollongong concrete calculator is a free online tool designed for homeowners, builders, concreters and project managers across the City of Wollongong and the broader Illawarra region of New South Wales. It covers all suburbs within the Wollongong LGA — including Figtree, Dapto, Thirroul, Corrimal, Fairy Meadow, Unanderra, Helensburgh, Coledale, Bulli, Woonona, Bellambi and Austinmer — as well as neighbouring areas such as Shellharbour, Kiama and the Southern Highlands. The calculator delivers instant cubic metre (m³) volumes, 20kg bag counts and realistic 2026 Wollongong concrete cost estimates based on current local ready-mix pricing.
Wollongong sits on a narrow coastal strip between the Illawarra Escarpment and the Tasman Sea, creating a unique combination of challenges for concrete construction. Steep hillside lots, reactive clay and shale soils, coastal salt exposure and high rainfall are all factors that influence concrete mix design, curing and slab specification in the Wollongong region. This calculator is built to help local residents and builders plan and budget accurately for any concrete project in the Illawarra area.
Many Wollongong properties — especially in escarpment suburbs such as Mount Keira, Keiraville, Mount Saint Thomas and Gwynneville — have steep access and reactive clay soils requiring engineer-designed footings. Always obtain a geotechnical site report and use a structural engineer before pouring any structural slab or footing on a hillside Wollongong block. Concrete pump hire is frequently essential in these areas — budget $500–$900 for pump costs on escarpment sites.
Getting an accurate concrete estimate for your Wollongong or Illawarra project takes less than a minute. Follow these five steps:
Selecting the correct concrete strength grade is critical for durability and structural compliance in the Wollongong region. The Illawarra's combination of high annual rainfall, coastal salt air, reactive shale and clay soils on the escarpment and expansive alluvial soils on the coastal plain all create demanding conditions for concrete. Properties within 1km of Wollongong's beaches — from Thirroul in the north to Shellharbour in the south — should always use a minimum N32 grade with a low water-cement ratio to resist chloride-induced corrosion of steel reinforcement mesh.
| Grade | Strength | Best Use — Wollongong | Est. Price / m³ (2026) | Notes |
|---|---|---|---|---|
| N20 | 20 MPa | Garden paths, non-structural fills | $185 – $210 | Not suitable near coast or escarpment |
| N25 | 25 MPa | House slabs, patios, shed floors | $195 – $225 | Most common residential grade |
| N32 | 32 MPa | Driveways, footings, coastal slabs | $215 – $250 | Recommended coastal and escarpment |
| N40 | 40 MPa | Commercial slabs, retaining structures | $245 – $285 | Engineer specification required |
Concrete prices in Wollongong are broadly aligned with greater Sydney pricing but typically run 5–10% lower due to lower labour costs and shorter supply distances from local batching plants. The 2026 ready-mix concrete cost in Wollongong ranges from approximately $190 – $285 per m³ depending on grade, order volume and delivery location within the Illawarra. Escarpment suburbs and steep hillside sites may attract a pump hire surcharge. Orders under 3 m³ typically incur a minimum load fee from Wollongong concrete suppliers, so consolidating smaller pours where possible is advisable.
Ready-mix concrete delivered across Wollongong and the Illawarra in 2026 costs approximately $190 – $285 per m³ depending on grade and site location. Suppliers servicing Wollongong include major producers with batching plants in the region. Saturday delivery is widely available for residential weekend pours. Always confirm minimum order quantities and small-load surcharges before booking your Wollongong concrete delivery.
For small pours under 0.5 m³, purchasing 20kg bagged concrete from Bunnings Wollongong or local hardware stores is a practical option. One 20kg bag yields approximately 0.009 m³. Expect to pay $9–$13 per 20kg bag in Wollongong in 2026. For any pour exceeding 1 m³, ready-mix delivery from a Wollongong supplier is almost always cheaper per cubic metre and produces a stronger, more consistent result.
Concrete pump hire is commonly required in Wollongong, particularly for escarpment suburb properties in Mount Keira, Keiraville, Figtree, Gwynneville and Mount Saint Thomas where steep block access prevents direct truck chute delivery. Pump hire in the Wollongong region costs approximately $500 – $900 in 2026. Line pumps are sufficient for most residential Wollongong applications; boom pumps are typically only required for multi-storey commercial projects.
Professional concrete finishing in Wollongong — including screeding, floating, trowelling and sealing — costs approximately $38 – $68 per m² in 2026. Exposed aggregate and broom finish are the most popular choices for Wollongong driveways and outdoor areas. Decorative finishes including coloured concrete and honed concrete add $15 – $30 per m² above a standard broom finish and are popular for alfresco areas and pool surrounds across the Illawarra.
Wollongong properties fall into two distinct risk categories for concrete design. Escarpment and hillside sites (Class H1, H2 or E under AS 2870) in suburbs such as Mount Keira, Figtree, Gwynneville and Keiraville require engineer-designed slabs with deeper footings, higher concrete grades and careful drainage design due to reactive clay and shale soils. Coastal properties within 1km of the shoreline require N32 minimum concrete grade, reduced water-cement ratios and corrosion-inhibiting admixtures to protect steel reinforcement from salt air chloride attack. Always engage a structural engineer and geotechnical consultant for any structural pour in Wollongong's escarpment or beachside zones.
| Project Type | Typical Size | Volume (m³) | Bags (20kg) | Est. Total Cost 2026 |
|---|---|---|---|---|
| Garden Path | 10m × 1m × 75mm | 0.75 m³ | ~90 bags | $150 – $350 |
| Backyard Patio | 6m × 4m × 100mm | 2.64 m³ | ~315 bags | $700 – $1,200 |
| Driveway | 10m × 4m × 150mm | 6.6 m³ | Ready-mix | $2,000 – $3,800 |
| Shed / Garage Floor | 9m × 6m × 100mm | 5.94 m³ | Ready-mix | $1,500 – $2,700 |
| House Slab | 15m × 10m × 110mm | 18.15 m³ | Ready-mix | $5,000 – $8,800 |
| Strip Footings | 36m × 0.4m × 0.6m | 8.64 m³ | Ready-mix | $2,400 – $4,400 |
| Pool Surround | 30m² × 100mm | 3.3 m³ | Ready-mix | $1,100 – $2,200 |
Wollongong's escarpment terrain, high rainfall and coastal exposure require careful planning for concrete work. Here are the key tips from experienced Illawarra concreters:
For any Wollongong project requiring more than 0.5 m³, order ready-mix concrete for delivery from a local Illawarra supplier. Ready-mix produces a more consistent mix, is cheaper per cubic metre than hand-mixing bags for volumes over 1 m³, and significantly reduces your labour time and risk of variable mix quality. For steep Wollongong escarpment sites, always factor pump hire into your budget before making a final decision between bagged and ready-mix options. Use our admixture dosage calculator to determine the correct corrosion inhibitor or plasticiser dosage for your pour volume and mix design.
Apply for construction certificates, check development controls and confirm permit requirements for concrete works on your Wollongong property. Wollongong City Council's Development Services team can advise on requirements for slabs, driveways, retaining walls and footings across the Illawarra LGA.
Visit Wollongong City Council →Verify your Wollongong concreter or builder holds a valid NSW contractor licence before signing any contract for structural concrete work. NSW Fair Trading provides a free online licence check for all licensed building and trade contractors in New South Wales.
Visit NSW Fair Trading →AS 3600 Concrete Structures and AS 2870 Residential Slabs and Footings are the key Australian Standards governing concrete design and construction in Wollongong. Your structural engineer will use these standards for grade selection, reinforcement cover and durability design — particularly important for Wollongong's coastal and escarpment exposure conditions.
Standards Australia →