How Much Does a Concrete Shed Slab Cost in Brisbane?
A concrete shed slab in Brisbane typically costs between $80 and $120 per square metre in 2026, depending on the slab thickness, reinforcement type, and site conditions. For a standard 6m x 6m garden shed, that puts the total cost at roughly $2,900 to $4,300 fully installed.
Shed slabs are one of the most common concreting jobs in Brisbane — whether you're putting down a base for a garden shed, a double garage, or a large workshop. The good news is they're relatively straightforward compared to house slabs, which keeps costs manageable. Below we break down exactly what you'll pay based on your shed size and requirements.
Shed Slab Cost by Size
| Shed Size | Area | Plain Concrete | With Thickened Edges | With Vehicle Loading |
|---|---|---|---|---|
| Small garden shed (3m x 3m) | 9m² | $720 – $1,080 | $900 – $1,300 | N/A |
| Standard shed (3m x 4.5m) | 13.5m² | $1,080 – $1,620 | $1,350 – $1,950 | N/A |
| Large shed (6m x 6m) | 36m² | $2,880 – $4,320 | $3,400 – $5,000 | $4,000 – $5,800 |
| Double garage (6m x 7m) | 42m² | $3,360 – $5,040 | $3,900 – $5,800 | $4,600 – $6,700 |
| Workshop (6m x 9m) | 54m² | $4,320 – $6,480 | $5,100 – $7,500 | $6,000 – $8,600 |
| Large workshop (9m x 12m) | 108m² | $8,640 – $12,960 | $10,000 – $14,500 | $11,800 – $17,000 |
| Industrial shed (12m x 15m) | 180m² | $14,400 – $21,600 | $16,500 – $24,000 | $19,800 – $28,800 |
Prices include concrete supply, labour, formwork, mesh reinforcement, and basic finishing. Excludes site preparation, excavation, and concrete pumping.
What Thickness Do You Need?
The right slab thickness depends on what you're storing in the shed. Getting this wrong can lead to cracking and costly repairs down the track.
| Use Case | Recommended Thickness | Reinforcement | Cost Impact |
|---|---|---|---|
| Garden storage (mower, tools) | 75mm | SL72 mesh | Base price |
| General storage (furniture, boxes) | 100mm | SL82 mesh | +5-10% |
| Single vehicle (car, trailer) | 100mm | SL82 mesh + edge thickening | +15-20% |
| Heavy vehicle (4WD, boat, caravan) | 125mm | SL92 mesh + edge thickening | +20-30% |
| Workshop with machinery | 125-150mm | SL92 mesh + rebar | +25-35% |
| Commercial/industrial | 150mm+ | Engineer-designed | +35-50% |
Our recommendation: For most Brisbane homeowners, a 100mm slab with SL82 mesh is the sweet spot. It handles general storage and light vehicle traffic without over-engineering the job. If you're parking a heavy 4WD or boat, step up to 125mm with SL92 mesh.
Additional Costs to Factor In
| Item | Cost Range | When It Applies |
|---|---|---|
| Site preparation and levelling | $10 – $30/m² | Most sites need some prep |
| Excavation (cut to level) | $15 – $40/m² | Sloping or uneven sites |
| Fill and compaction | $20 – $50/m² | Low-lying areas needing build-up |
| Concrete pump hire | $800 – $1,500 | Rear yards with limited truck access |
| Edge thickening (bolt-down rebate) | $15 – $25/lineal metre | Sheds bolted to slab |
| Plumbing penetrations | $50 – $150 each | If shed needs water/drainage |
| Vapour barrier (plastic membrane) | $3 – $6/m² | Recommended for all shed slabs |
| Exposed aggregate upgrade | +$30 – $50/m² | If matching existing driveway |
| Coloured concrete | +$15 – $30/m² | Aesthetic preference |
What Affects Your Shed Slab Cost?
1. Slab Size and Thickness
The biggest cost driver is simply the area and thickness. More concrete means more material and labour. A 100mm slab uses 33% more concrete than a 75mm slab for the same area.
2. Site Access
If the concrete truck can reverse right up to the pour site, costs stay low. If your shed is in a backyard behind the house with no side access, you'll need a concrete pump ($800 to $1,500) or the crew will need to wheelbarrow the concrete in, which adds significant labour time.
3. Ground Conditions
Brisbane's clay soils can be challenging. If the ground is soft, waterlogged, or has been recently filled, additional compaction or even a deeper sub-base may be needed. Rocky ground requires more excavation effort. Both add to preparation costs.
4. Slope and Levelling
A flat block is the cheapest to work with. If your shed site slopes, the concreter needs to either cut into the high side or build up the low side with fill — sometimes both. Significant level changes may require a small retaining wall on one or more sides.
5. Reinforcement Requirements
Standard mesh reinforcement (SL82) is included in most quotes. If you need heavier reinforcement for vehicle loading or machinery, the upgrade to SL92 mesh or additional rebar increases material costs by 15-25%.
6. Edge Details and Bolt-Downs
Most sheds need bolt-down points cast into the slab. This requires thickened edges (typically 300mm deep x 300mm wide around the perimeter) with starter bolts or cast-in brackets. This adds $15 to $25 per lineal metre of edge.
7. Finish Type
A standard broom finish is included in the base price. If you want the shed slab to match an exposed aggregate driveway or you prefer a smoother trowelled finish, expect to pay extra.
How to Save Money on Your Shed Slab
Do the site prep yourself
If you can clear vegetation, remove debris, and roughly level the site before the concreters arrive, you can save $500 to $1,500 on preparation costs. Just make sure you don't over-excavate or disturb stable ground.
Combine with other concrete work
If you're also getting a driveway, path, or patio done, having everything poured in the same visit saves on mobilisation costs and concrete delivery minimums. Most concreters offer a discount for combined jobs.
Choose the right thickness — not the maximum
Don't over-engineer the slab. A garden shed storing tools and a mower doesn't need a 150mm vehicle-rated slab. Talk to your concreter about what you'll actually store and they'll recommend the appropriate specification.
Ensure good access
If possible, choose a shed location that allows the concrete truck to get close. Every metre of distance between the truck and the pour site adds labour time and cost.
Get the timing right
Brisbane's concreting industry is busiest from April to October (the dry season). If your project isn't urgent, booking during the quieter summer months (November to February) may get you a better price — just be aware that rain delays are more likely.
Shed Slab vs Other Base Options
| Base Type | Cost per m² | Durability | Best For |
|---|---|---|---|
| Concrete slab | $80 – $120 | 30+ years | All shed types, vehicles, workshops |
| Compacted gravel | $20 – $40 | 5-10 years | Small garden sheds, budget option |
| Concrete pavers | $60 – $100 | 15-20 years | Small to medium sheds |
| Timber bearers on piers | $50 – $80 | 10-15 years | Small sheds on slopes |
| Screw piles + steel frame | $80 – $130 | 25+ years | Difficult access, reactive soils |
A concrete slab is the most durable and versatile option. While gravel is cheaper upfront, it shifts over time, allows moisture through, and doesn't support heavy loads. For any shed larger than 3m x 3m or anything storing vehicles, a concrete slab is the recommended choice.
Do I Need Council Approval for a Shed Slab?
In Brisbane, the slab itself doesn't usually require separate approval — but the shed on top of it might. Here's the general rule:
- Sheds under 10m² and 2.4m high: Generally exempt from building approval in Brisbane (but must comply with boundary setbacks)
- Sheds 10m² to 50m²: May be self-assessable under the Queensland Development Code, meaning you can proceed without a full development application if you meet the criteria
- Sheds over 50m²: Typically require building approval from a private certifier
Always check with Brisbane City Council or your local council for the specific requirements in your area. Your shed supplier can usually advise on approval requirements.
Frequently Asked Questions
How long does it take to pour a shed slab?
A standard shed slab (up to 50m²) is typically a one-day job — preparation and formwork in the morning, pour in the afternoon. The concrete needs 24-48 hours before you can walk on it and 7 days before placing the shed. For vehicle-rated slabs, allow 28 days of curing before driving on it.
Can I pour a shed slab myself?
While it's technically possible for a small shed (under 10m²), we don't recommend DIY for anything larger. Getting the levels, falls, thickness, and reinforcement right requires experience. A poorly poured slab can crack, sink, or not drain properly — and fixing it costs more than doing it right the first time.
Does a shed slab need drainage?
Yes. The slab should have a slight fall (typically 1:100) toward the shed door or to one side so water doesn't pool inside. Your concreter will set the formwork to achieve the correct fall. For workshops where you'll be washing down the floor, a steeper fall toward a floor drain is recommended.
Should I get the slab poured before or after the shed frame goes up?
Almost always before. The shed frame bolts down to the slab, so the slab needs to be poured and cured first. The bolt-down positions should be set based on the shed manufacturer's specifications — make sure you have the shed plans before the slab is poured.
How long does a concrete shed slab last?
A properly poured and reinforced concrete slab will last 30+ years with minimal maintenance. The key factors for longevity are correct thickness, proper reinforcement, good drainage, and adequate curing time after pouring.
What's the minimum concrete order in Brisbane?
Most concrete suppliers in Brisbane have a minimum order of 0.8 to 1.0 cubic metres. For very small slabs (under 5m²), you may be better off using bagged concrete mix from Bunnings — though it's more labour-intensive and the finish won't be as consistent.
Get a Free Shed Slab Quote
Every shed slab project is different — site access, ground conditions, and your specific requirements all affect the final price. The best way to get an accurate cost is to have a concreter visit your site and provide a detailed quote.
At Concrete Concepts Group, we pour shed slabs across Brisbane and all surrounding areas. We'll assess your site, recommend the right slab specification for your needs, and provide a transparent, itemised quote with no hidden costs.
Get a free quote online or call us on 0424 463 268 to discuss your shed slab project.
Concrete Concepts Group
QBCC Licensed (#15299707) concreting professionals serving Brisbane and all surrounding areas. Over 100 projects completed with a 5-star reputation.
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