Commercial Slabs
Commercial slabs are the structural floor of a commercial or industrial building — slab-on-ground or suspended — engineered by a structural engineer for the building's intended use, whether that's retail fitout, warehouse racking or machinery. This differs from a general commercial concrete pour like a car park in that thickness, reinforcement, movement joints and services coordination are all set by an engineering design, not a standard specification.
Pricing guide: How much does a commercial structural slab cost?
Typically $100 to $220 per square metre depending on reinforcement, thickness and ground conditions, before allowing for separate engineering design and permit costs.
Why homeowners choose it
- Designed by a structural engineer for the building's specific load and soil conditions
- Reinforcement and slab thickness matched to intended use, such as racking or machinery loads
- Movement and construction joints planned to control cracking across large floor areas
- Services penetrations and edge details coordinated with the wider building design
- Finished to the flatness tolerance racking, machinery or shopfitting requires
How it works
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1
Engineering design
A structural engineer sizes the slab and reinforcement to the building's load and soil conditions.
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2
Excavation & compaction
The site is excavated and the base compacted to the tested standard the design calls for.
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3
Reinforcement & services
Reinforcement is fixed and services penetrations are coordinated with other trades before the pour.
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4
Pour & power-float
The slab is poured and finished to the flatness tolerance the building's use requires.
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5
Curing & sign-off
The slab cures before inspection and sign-off against the engineering specification.
Hiring guide
Questions worth asking before you commit to a contractor.
Ask to see it, not just take their word for it. Insurance protects your property if something goes wrong on site.
Site preparation, disposal of old material, and any council permits can be included or charged separately — get it in writing before you compare quotes.
Some contractors do the work themselves; others subcontract parts of it. Neither is wrong, but you should know who is doing your job.
Old concrete, tree roots or drainage issues are common surprises. Ask how a change of scope gets costed before it happens, not after.
Materials usually carry a manufacturer's warranty. Ask specifically about the contractor's own workmanship warranty too.
Frequently asked questions
How much does a commercial structural slab cost?
Typically $100 to $220 per square metre depending on reinforcement, thickness and ground conditions, before allowing for separate engineering design and permit costs.
Do all commercial slabs need an engineer?
Yes, structural slabs for commercial and industrial buildings are designed by a structural engineer to suit the building's loads, and generally require building surveyor sign-off.
How is a commercial slab different from a driveway or car park slab?
A structural building slab carries the building itself and whatever it houses, so it's designed to a specific engineering specification rather than a general-purpose paving mix.
What happens if the site has poor soil?
Poor or reactive soil typically means additional ground improvement, a thicker slab, deeper footings or piering, all specified by the engineer based on geotechnical information.
Commercial Slabs in popular suburbs
Local pricing, FAQs and a map for these areas.
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