Enter the basic project details and send us a useful starting brief. We calculate the footprint, but we do not invent a ground screw count from square metres alone.
Width and depth define the basic footprint, not the final ground screw layout.
The project type tells us what kind of frame or floor needs supporting.
Postcode, access and what you know about the ground help us plan the job.
Choose supply only, supply and installation, or help reviewing the project.
Direct answers on screw quantity, what a calculator can safely do, quote inputs and the effect of ground conditions.
The number of ground screws depends on where the building needs support, the spans between supports, the weight of the build and the ground. A fixed screws-per-square-metre rule is not reliable. This calculator gathers the details we need to start working it out.
Not from width and depth alone. Floor or frame spans, heavy point loads, screw capacity, ground conditions and how the frame fixes to the screws all affect the final layout.
Understand load calculationsStart with what you are building, the width and depth, postcode, access, levels, anything you know about the ground and any drawings you have.
Yes. The ground can change the screw size, depth and layout, and it can also affect whether testing is needed.
Read the soil guide