1-9 Seymour Street

Client The Portman Estate

Sector Commercial, Residential

Location Greater London

Value £50m

Built on the site of the former Marylebone police station, 1-9 Seymour Street is an exemplar mixed-use scheme in the heart of London.

The project, delivered for The Portman Estate created 48,000 sqft of new office space as the centrepiece of the new development. A further 24 high-quality apartments were included in the upper levels of the development, as well as community spaces including a new restaurant.

The building sits in the top 1% of sustainable non-domestic buildings in the country, having achieved a BREEAM Outstanding rating, with the residential element set to reach the equivalent for the former Code for Sustainable Homes level four. The building incorporates photovoltaic panels, highly efficient plant for heating, and utilised A or A+ rated materials.

There are also substantial green and brown roofing areas and throughout the build Galliford Try worked with a carbon monitoring company to monitor all of the carbon usage on site. All tendering contractors were also required to provide their carbon credentials which were used as part of the tender recommendation.

The major challenge in the construction phase was met in the groundworks, where ground conditions featured great variability that made underpinning particularly difficult. This necessitated a change to a secant piled response to the deepest wettest parts, which were redesigned in live time.

The project was a finalist at the Ground Engineering Awards 2017.