What are Helical Piles? Helical piles or helical piers have one to four helix plates; which resemble one pitch of a screw thread that act like an auger, driving or boring the pile into the ground. These helix plates are welded onto a shaft, both of which have a range of sizes to accommodate different applications and load conditions. A basic geotechnical investigation, on the other hand, will usually cost a minimum of £1,500 + VAT depending on the size and complexity of the project. ... Depending on the project, screw piling can be faster, cheaper and less messy than using concrete. The price for a screw pile set could be anywhere from £45 - £300.