Screw Piles
A screw pile is a steel shaft with helical flights that's mechanically screwed into the ground to act as a foundation, rather than being dug and poured like a concrete footing. They're commonly used for decks, verandahs, carports, light structures and sometimes retaining wall posts, particularly where a quick install or minimal ground disturbance matters. Because there's no concrete curing time, structures can often be built on the same day the piles go in.
Pricing guide: How much do screw piles cost?
Typically $150 to $400 per pile for standard residential loads, depending on pile size, depth and site access for the installation rig.
Why homeowners choose it
- Installed and load-ready without any concrete curing time
- Minimal spoil and ground disturbance compared to bored or dug footings
- Can be installed close to existing structures, fences or boundaries
- Torque during installation gives an immediate indication of capacity
- Suited to sites with reactive soil, fill or restricted machine access
How it works
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1
Engineering and design
Pile diameter, length and layout are specified based on the structure's load and the site's soil conditions.
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2
Setout
Pile positions are marked to the engineered layout, checking clearances from boundaries and services.
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3
Installation
A hydraulic drive head screws each pile into the ground to the specified depth or torque reading.
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4
Torque verification
Installation torque is recorded and checked against the design to confirm each pile has reached adequate capacity.
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5
Bracket fitting
A bracket is fitted to the top of each pile ready to connect to the structure's bearers or posts.
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 do screw piles cost?
Typically $150 to $400 per pile for standard residential loads, depending on pile size, depth and site access for the installation rig.
Are screw piles as strong as concrete footings?
When sized and installed to an engineer's specification, screw piles are a recognised structural foundation system used across residential and light commercial work.
How quickly can I build after screw piles are installed?
Because there's no concrete to cure, building can often start the same day, unlike bored or poured concrete footings.
What soil conditions suit screw piles?
They perform well in most soils but installation torque, and therefore capacity, can vary in very rocky or dense ground, which an engineer accounts for in the design.
Screw Piles in popular suburbs
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