Get an instant estimate for your concrete shed slab in Brisbane and South East Queensland
This is a rough guide only. Get a precise quote based on your actual site conditions.
Get Your Free Quote*All prices are indicative starting-from guides only. Final pricing depends on site conditions, access, soil type and specific requirements. This calculator provides rough estimates for Brisbane and South East Queensland. Actual costs may be higher or lower. Contact us for an accurate quote.
Understanding what goes into the price of a concrete slab
Your slab cost starts with the volume of concrete needed: length × width × thickness. A 6x4m slab at 100mm needs 2.4m³ of concrete. Concrete in SEQ typically costs $250-$350 per cubic metre delivered, depending on the mix and your distance from the plant.
Before concrete is poured, the ground needs excavating, levelling and compacting. A compacted road base layer goes down, then formwork is set to the correct level. Sloping blocks or difficult access can increase preparation costs significantly.
Steel mesh (SL72 for standard sheds, SL82 for garages) reinforces the slab against cracking. The surface is then finished — broom finish for grip, steel trowel for smooth, or exposed aggregate for decorative areas. All included in the price.
Shed slab costs in South East Queensland vary based on several factors beyond just the size of the slab. Brisbane's reactive clay soils often need extra ground preparation. Logan's sloping blocks may require cut-and-fill work. Ipswich's expansive soils sometimes call for engineered specifications.
Our calculator gives you a starting-point estimate, but every site is different. A flat, easy-access block in Springwood will cost less than a steep slope in Jimboomba. That's why we provide free on-site assessments — so your quote reflects your actual conditions, not a generic formula.
Read our detailed guide on shed slab costs in Brisbane for a deeper breakdown of what affects pricing.
| Size | Area | From* |
|---|---|---|
| 3x3m | 9m² | $1,500 |
| 4x3m | 12m² | $1,800 |
| 4x4m | 16m² | $2,000 |
| 6x4m | 24m² | $2,200 |
| 6x6m | 36m² | $2,800 |
| 9x6m | 54m² | $3,200 |
*All prices are indicative starting-from guides only. 100mm thick, SL72 mesh, broom finish, flat site with easy access. Contact us for an accurate quote.
Common questions about shed slab costs and sizing
This calculator provides a rough starting estimate based on typical costs in Brisbane and South East Queensland. Actual costs depend on your specific site — soil conditions, access, slope, location and preparation required. Use it as a budget guide, then contact us for an accurate on-site quote.
The main cost factors are: slab size and thickness, site access (can a concrete truck reach the spot?), ground slope, soil conditions (clay requires more preparation), distance from the concrete plant, reinforcement type, and surface finish. Difficult sites with poor access or steep slopes will cost more than flat, easy-access blocks.
Concrete volume is length × width × thickness. For example, a 6x4m slab at 100mm thick needs 6 × 4 × 0.1 = 2.4 cubic metres. We always order slightly more (about 5-10%) to account for waste and uneven ground. Our calculator works this out for you automatically.
100mm is standard for most garden sheds and storage buildings. Choose 125mm for heavier sheds, single garages, or sheds storing heavy equipment. Go with 150mm for double garages, vehicle workshops, or where heavy loads will be placed. Read our full guide on shed slab thickness.
SL72 mesh is the standard for shed slabs up to 100mm thick. SL82 mesh is used for thicker slabs (125mm+) and garages that support vehicle weight. Mesh sheets are typically 6x2.4m and are overlapped by at least 200mm. We recommend the right mesh based on your specific project and soil conditions.