The £35m project for property investor QV Unit Trust will see a new eight floor added to 71 Queen Victoria Street and a new facade fitted to the building.

Bouygues UK’s team has just started on site, with completion due in December 2013.

Arnaud Bekaert, deputy managing director said: “We are very excited to be working on this office refurbishment project and this is a great opportunity for us to utilise our group’s knowledge and expertise of the sector.

“We have a great relationship with building consultant MHBC and the entire professional team and look forward to working with them on this project in the heart of London.”