6 screw piles and a 28m² RC raft slab for a replacement garden building at The Old Vicarage in Greywell, Hampshire. Gravel and flint over chalk provided excellent bearing — foundation completed in four days.
Our team delivered the screw pile foundation and reinforced concrete raft slab for a replacement garden building at The Old Vicarage in Greywell, near Hook in Hampshire. The oak-framed building required a piled solution designed to carry loads efficiently down to competent chalk bedrock beneath the upper gravel soils.
The pile design for the Greywell site was based on a ground profile of gravel with flints overlying chalk, with an effective soil density of 18kN/m³ and a friction angle of 30°. These conditions were well-suited to helical screw piles, which achieve their capacity through both end bearing and shaft friction in granular soils.
We installed 6 Type 76R screw piles, each with triple helix lead flights designed to reach the chalk-bearing stratum. The helices - at 200mm, 250mm and 300mm diameter - were torqued into the competent chalk, with installation verified by monitoring torque pressure against the design values. Safe working loads ranged from 50kN to 100kN per pile, with an achieved factor of safety of 4.1 - well above the required minimum of 2.5.
The 28m² reinforced concrete raft slab was cast at 175mm thickness on 50mm blinding, completing the foundation for the garden building. The entire project - mobilisation, piling and slab - was delivered in approximately four days.
Complete technical breakdown of the piling and foundation works delivered at Greywell, Hampshire.
Gravel with Flints over Chalk
Slab: 28m², 175mm RC on 50mm blinding
4 days
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4.9Google Reviews"What can I say, the team were a pleasure to deal with from start to finish. My wife and I did a fair amount of due diligence... Our experience was that they seemed to go the extra mile. A shout out to Barrie the project manager but of course not forgetting Lenny and Baz who worked tirelessly throughout. And a special thank you to Ben Crabb - right from our first conversation, you proposed options and were so helpful and informative."
"A really nice family business that we couldn't recommend more highly. We had a 14m x 11m foundation concrete slab with mini piles completed within their estimation of 4 weeks... The building inspector said he wished all his clients were up to their standards! From my many phone calls with Ben from the outset through to Ricky, Barrie and Shane (3 brothers) they are all so friendly and helpful."
"What a breath of fresh air to deal with a company that exceeds all of your expectations. From my first contact with Barrie in the office to the two hardworking men, Dan and Lenny who carried out the job, I have been so impressed with their professionalism, capability and friendliness. Thank you for a job 'very well done'."
"We chose them for our extension. The sales person Ben was extremely helpful with his comments and always available to discuss matters and never missed a call back. Ricky the project manager explained what was happening throughout the procedure with phone calls and I must mention Rachel for any issues we had. Overall very good job done."
"What can I say, the team were a pleasure to deal with from start to finish. My wife and I did a fair amount of due diligence... Our experience was that they seemed to go the extra mile. A shout out to Barrie the project manager but of course not forgetting Lenny and Baz who worked tirelessly throughout. And a special thank you to Ben Crabb - right from our first conversation, you proposed options and were so helpful and informative."
"A really nice family business that we couldn't recommend more highly. We had a 14m x 11m foundation concrete slab with mini piles completed within their estimation of 4 weeks... The building inspector said he wished all his clients were up to their standards! From my many phone calls with Ben from the outset through to Ricky, Barrie and Shane (3 brothers) they are all so friendly and helpful."
"What a breath of fresh air to deal with a company that exceeds all of your expectations. From my first contact with Barrie in the office to the two hardworking men, Dan and Lenny who carried out the job, I have been so impressed with their professionalism, capability and friendliness. Thank you for a job 'very well done'."
"We chose them for our extension. The sales person Ben was extremely helpful with his comments and always available to discuss matters and never missed a call back. Ricky the project manager explained what was happening throughout the procedure with phone calls and I must mention Rachel for any issues we had. Overall very good job done."
"What can I say, the team were a pleasure to deal with from start to finish. My wife and I did a fair amount of due diligence... Our experience was that they seemed to go the extra mile. A shout out to Barrie the project manager but of course not forgetting Lenny and Baz who worked tirelessly throughout. And a special thank you to Ben Crabb - right from our first conversation, you proposed options and were so helpful and informative."
"A really nice family business that we couldn't recommend more highly. We had a 14m x 11m foundation concrete slab with mini piles completed within their estimation of 4 weeks... The building inspector said he wished all his clients were up to their standards! From my many phone calls with Ben from the outset through to Ricky, Barrie and Shane (3 brothers) they are all so friendly and helpful."
"What a breath of fresh air to deal with a company that exceeds all of your expectations. From my first contact with Barrie in the office to the two hardworking men, Dan and Lenny who carried out the job, I have been so impressed with their professionalism, capability and friendliness. Thank you for a job 'very well done'."
"We chose them for our extension. The sales person Ben was extremely helpful with his comments and always available to discuss matters and never missed a call back. Ricky the project manager explained what was happening throughout the procedure with phone calls and I must mention Rachel for any issues we had. Overall very good job done."
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