A Keller Company

Phi Group is the UK’s largest retaining structures contractor, and has been the market leader in the design, supply & installation of retaining structures for 30 years.

We complete over 300 contracts a year, in a challenging and demanding field of construction, offering our Clients the complete design, supply & installation package using our wide range of innovative solutions.

In 2006 Phi Group was acquired by Keller Limited, the UK arm of Keller Plc, the world’s largest independent geotechnical contractor. With a turnover of £2.3 Billion per annum, Keller has offices in 40 countries, on six continents and employs over 9,000 people worldwide.

Since 2006, Phi Group has been the retaining structures division of Keller Limited, continuing to operate at the forefront of retaining structures technology, supported by the financial, HSEQ and technical assistance that being part of a multi-national company brings. For more information please visit the Keller website at www.keller.co.uk

More about Keller

Keller in Action

By 2018 Victoria Tube Station will have a new ticket hall with more connecting tunnels that will join the existing parts and new parts of the station together. These have all been constructed in water bearing soils needing treatment. This is the largest jet grouting project undertaken in Europe.

Where we've done it

Our solutions are used across the construction industry from residential development, infrastructure and civil engineering to the energy and resource sectors.


We deliver cost effective retaining and slope stabilisation solutions safely - click on the arrows to find the techniques you are looking for.