How Thick Should a Shed Concrete Slab Be?
Thickness is one of those things that's easy to overlook until after the concrete is poured. This page explains what the common options are, what they're suited to, and what to tell a concreter when you ask for a quote.
Request a shed slab quoteThe common thickness options
100mm
The standard thickness for most residential shed and garage slabs. Suits storage sheds, garden sheds, single garages and workshops with light equipment. It's the starting point we'll usually quote unless you specify otherwise.
125mm
A step up from standard. Used when you'll have heavier loads — a car hoist, heavy machinery, a large workshop setup. Adds more concrete and some cost over 100mm.
150mm
For heavier commercial or industrial use, or where ground conditions suggest extra strength is needed. Not commonly needed for a typical residential shed.
Garden shed slab thickness
Many people ask specifically how thick a garden shed concrete slab should be. The answer depends on the shed size, what will be stored inside, ground condition and whether the slab may carry heavier loads over time. For a typical residential garden shed, 100mm is the common starting point — but the concreter can confirm what suits your site once they understand the job.
If you're still working out how big the concrete slab for your shed needs to be, our guide on what size shed slab you need is a useful starting point.
Not sure what thickness you need?
That's fine. When you fill in the quote form, you can select "Not sure" for thickness. Just describe what the slab is for — we can advise based on your intended use and site conditions.
If you haven't settled on a slab size yet either, our guide on what size a shed slab should be can help you work through the dimensions first.
What about reinforcement?
Most shed slabs include steel mesh reinforcement as standard. For heavier applications, additional reo bar may be recommended. This is something we'll advise on during the quoting process — you don't need to specify it upfront.
If you're weighing up whether to hire a concreter or do it yourself, see our guide on DIY vs hiring a concreter for a shed slab for an honest comparison.
What to include when requesting a quote
- Approximate slab length and width in metres
- What the slab is for and what will be stored or used on it
- Your suburb
- Whether the ground is flat, sloped, cleared or unprepared
- Whether there is easy access from the driveway, street or gate
- Photos of the slab area and access if you have them
Related shed slab guides
Save this quick guide
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Shed Slab Thickness Guide
Which thickness is right for your job?
- 100mm — Standard. Most residential sheds, garages and workshops with light equipment.
- 125mm — Heavier loads. Car hoist, machinery or larger workshop setups.
- 150mm — Heavy commercial or industrial use.
Not sure? Select 'Not sure' on the quote form and describe what the slab is for. We'll advise.
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Shed Slab Thickness Guide
Which thickness is right for your job?
- 100mm — Standard. Most residential sheds, garages and workshops with light equipment.
- 125mm — Heavier loads. Car hoist, machinery or larger workshop setups.
- 150mm — Heavy commercial or industrial use.
Shed Slab Ballarat
shedslabballarat.com.au
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Share your shed size, suburb, access details and optional photos so we can understand the job before calling you back.
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