Concrete Shed Base Sydney
Level, moisture-free bases for any shed or workshop
A concrete shed base is one of the most straightforward concrete jobs on a residential property — but it still needs to be done right. An unlevel base causes the shed frame to rack and twist, doors that won't close, and water pooling inside. A slab without a moisture barrier causes rust on tools and fittings, and eventual structural deterioration of the shed floor framing.
About Our Shed Bases Service
A concrete shed base is one of the most straightforward concrete jobs on a residential property — but it still needs to be done right. An unlevel base causes the shed frame to rack and twist, doors that won't close, and water pooling inside. A slab without a moisture barrier causes rust on tools and fittings, and eventual structural deterioration of the shed floor framing.
We install concrete shed bases for all standard kit shed sizes from 3m × 3m garden sheds to 9m × 6m workshop sheds and larger. The slab is formed, poured, screeded level, and finished with a broom texture for grip. Every base includes a moisture barrier and is poured with correct drainage falls away from the shed door.
We can coordinate with your shed supplier to ensure the slab dimensions, anchor bolt layout, and concrete thickness all match the shed's structural requirements.
Price Guide
From 9m² garden shed to 54m² workshop
Includes concrete supply, mesh, moisture barrier, formwork, broom finish, and curing. Metro zone pricing.
Calculate Your Price →Shed Bases Options We Offer
Every project is different — we match the right specification to your needs and budget.
Standard Garden Shed Base
75–100mm N20 concrete for small to medium garden sheds (up to 6m × 4m). Includes moisture barrier, broom finish, and drainage fall. Suitable for lightweight Colorbond or timber sheds.
From $80/m² all-inWorkshop / Garage Slab
100–125mm N25 concrete with mesh reinforcement for larger sheds, workshops, and man-caves. Handles vehicle access, heavy benches, and machinery loads.
From $95/m² all-inShed Base with Anchor Bolts
Shed base with chemically set or cast-in anchor bolts positioned to the shed manufacturer's layout drawing. Ensures the shed frame is correctly tied down to the slab.
Add $150–$300 for anchor bolt installationRaised Shed Base
Shed slab poured on a raised fill platform for sloped blocks or to provide clearance above ground level. Requires additional formwork and fill — quoted per project.
Quoted on site conditionsOur Shed Bases Process
What to expect from the first call to finished product.
Dimension confirmation — shed dimensions, anchor bolt layout (if required), and any slope or drainage considerations confirmed before work starts
Excavation and base prep — topsoil removed, sub-base compacted, gravel layer installed where required for drainage
Vapour barrier and formwork — heavy-duty polyethylene moisture barrier laid, edge forms set level and square to the shed footprint
Pour and screed — N20 or N25 concrete placed and screeded flat to within ±3mm; broom finish applied; anchor bolts set if required
Strip and cure — edge forms stripped after 24 hours, slab cured for 7 days before shed frame installation
Why Choose Us
Sydney's Trusted Concreters for Shed Bases
- ✓15+ years installing shed bases across Sydney Metro
- ✓Licensed concrete contractor — NSW Builder's Licence
- ✓Fully insured — public liability & workers compensation
- ✓Free site quotes with no obligation
- ✓Real pricing based on current Sydney supplier rates
- ✓On-time scheduling and clean site, guaranteed
Instant Estimate
Concrete Price Calculator — Sydney
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e.g. 40 for a standard driveway
Shed Bases — Frequently Asked Questions
Common questions from Sydney homeowners and builders.
How much does a concrete shed base cost in Sydney?
A standard concrete shed base in Sydney costs approximately $80–$100/m² all-in. A 3m × 3m garden shed base (9m²) runs $900–$1,200 including GST. A 6m × 4m shed base (24m²) costs $2,200–$3,000. A larger 9m × 6m workshop slab (54m²) is typically $5,500–$7,000. Prices include concrete, labour, moisture barrier, and formwork.
How thick should a concrete shed base be?
75mm is the minimum for a light garden shed with no vehicle access. 100mm is standard for most residential sheds. 125mm is recommended for sheds that will have vehicle access (e.g., ride-on mower, motorbike) or hold very heavy equipment like a car lift or large machinery.
Should I install the shed base before or after ordering the shed?
Before the shed kit arrives is ideal — you have time to cure the slab properly and the site is clear for the shed installers. However, confirm the exact slab dimensions with your shed supplier first, as the base needs to match the frame layout. We're happy to work from the shed supplier's drawings.
Do I need council approval for a shed base?
In most Sydney LGAs, a concrete shed base for a shed under the exempt development threshold (typically under 20m² and under 3m high) does not require approval. If the shed itself requires a development application or complying development certificate, the slab will also be covered by that approval. We can advise on your LGA's specific rules.
Can the shed base include a step or ramp?
Yes — if the shed slab is raised above the surrounding ground level, we can form and pour a step or ramp as part of the same pour. This is more efficient than a separate job and ensures the step or ramp is monolithic with the slab.
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Learn more →Ready to Start Your Shed Bases Project?
Call us or send an enquiry and we'll get back within 2 hours with a confirmed quote.