Geovex has its head office in London, on Tottenham Court Road. Mini piling and screw piling lead this page, because the three London jobs shown here used them: bored mini piles at Mill Hill, driven steel cased mini piles in Bromley and screw piles in Enfield.
They are examples. Behind them is a family that has been piling for over 20 years, and what this site shows is a selection of its jobs. We also install CFA piles for larger schemes and build the reinforced concrete that sits on the piles.
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On Sylvan Avenue in Mill Hill a block of single-storey garages was to be rebuilt on a new piled raft. A shared drain ran a little over three metres from the work. That was too close for driven piles, so the piles were bored.
They are sectional flight auger mini piles, open-bored at 300mm diameter. There are 15 piles, with working loads of 50kN to 100kN, and each has a cage of four H12 bars. The piles went in over two days, on 14 and 15 April 2026.
The raft over them is 250mm reinforced concrete of about 57m², in C28/35 concrete, with A393 steel mesh top and bottom. It was cast on a 225mm void former for anti-heave protection. We were on site from 1 to 27 April 2026, working on twelve days.
In Bromley the job was the piled foundations and two reinforced concrete bases built for two freestanding LED video screens at a football stadium on Hayes Lane. Each screen is designed to stand on a single steel column, with one base under each column. Screw piles were considered, because the work sat between buried services, and ruled out: the ground was not favourable for them and the engineer had specified driven steel cased piles.
Eight steel cased driven mini piles of 220mm went in, four under each base. Each casing was driven with a 0.5 tonne drop hammer and reinforced with four H16 bars. Each pile is designed for 150kN in compression, 30kN in tension and 25kN of lateral load. The first four piles were driven on 1 July 2026, the day work started on site.
SFA PilingMill Hill, London
SCD PilingBromley
Screw PilingEnfield, London
On Enfield Road in Enfield we installed the screw piles and the reinforced concrete raft for a single-storey extension to a day nursery. Mature oak trees stand close to the extension, so it is carried on piles.
The piles are 89R helical screw piles, each with a triple-helix lead section and plain extension sections. The helix plates are 300mm, 250mm and 200mm. There are 12 piles, with safe working loads of 80kN to 185kN. Each was screwed in until it reached refusal, with a hydraulic torque head mounted on a 3-tonne excavator, over three days in April 2026.
The raft is 225mm reinforced concrete with a cap over every pile, cast on 160mm clay board. Its steel is H12 and H16 bars at 200mm centres, top and bottom, with H12 U-bars round the edge, about 1.6 tonnes in all. The concrete was poured on Saturday 2 May, when the day nursery was closed, so the lorry did not block its entrance.
The piles and the raft were designed so that a first floor can be added later.
Our services: Mini pilingCFA pilingSFA pilingSCD pilingScrew pilingFoundations
This section repeats what the three write-ups record and adds nothing to them. At Mill Hill the pile design takes the ground as London Clay under thin made ground. For Enfield the ground was expected from desk data: no site investigation was carried out, and the design used a British Geological Survey borehole record nearby, which shows topsoil over firm to stiff clay.
In Bromley the ground is made ground over sand and clay, with groundwater. The write-ups give no levels for the strata or the water, so none are given here.
Three sites are not a map of London. A ground investigation of your own site tells the engineer what is there, and we read it before we recommend a method.
We work for builders, developers, groundworkers and structural engineers with drawings in hand. The London jobs above are an extension, a block of garages and a pair of bases. This page is equally for housing plots, commercial buildings and programmes that run for weeks.
On a tight London plot the access often decides the rig. Our 750mm-wide mini piling rigs pass down a side passage and form piles from 150mm to 350mm across. Where each pile carries 400kN or less, a mini pile does the structural job of a larger pile from a rig that arrives on standard transport.
For larger schemes we install CFA piles, formed in one pass through a hollow-stem auger. Whatever the method, we build the raft, the pile caps or the ground beams as well, so one contractor takes the job from the first pile to the finished concrete.
Send the drawings, the site address and any ground investigation report. With drawings we return a detailed quote within 24 hours.
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