Projects / Quadrant 2, 7 Air Street

Quadrant 2, 7 Air Street

The phased redevelopment of a Grade II listed commercial office in the heart of the West End.

Image © The Crown Estate and Agnese Sanvito

The Vision

The phased redevelopment of a Grade II listed commercial office-led project, forming part of The Crown Estate’s £1 billion Regent Street regeneration scheme.

Phase one of Quadrant 2 was a separate redevelopment of the neighbouring ground floor retail space. This involved the amalgamation of three retail units into large two layer units to create approx. 10,000 sq ft of prime retail space.

Phase two was the redevelopment of Grade II Listed properties known as Quadrant House and 7-9 Air Street into a single upgraded, highly sustainable, low energy air-conditioned office building. The development was complex and included a complicated demolition sequence of the upper floors, the combing of the existing office floor plates at each level, a rooftop extension, a new core, new reception area, and a communal terrace. The scheme also features, low energy air conditioning, LED lighting, solar panels and incorporates a unique central energy centre, powered by fuel cell technology which saves around 350 tonnes of carbon dioxide emissions each year, while providing power to 500,000 sq ft of commercial and residential accommodation on Regent Street.

In addition, the sites ecological roof incorporates flowers, vegetation, grasses and habitats for insects, birds and bats. This new pocket of green space is included with the first phase of an ecology initiative project called ‘Wild West End’ that was recently launched by key London property owners, of which the Crowne Estate are part of.

Our Role

We are delighted to be working with The Crown Estate on a number of their Regent Street projects.  Appointed as Project Manager and Employer’s Agent, our duties included: Managing the feasibility option studies; Preparation of a scheme for planning and listed building consent; Managing the design team; Managing procurement routes; Developing client changes; Managing Rights to light and party wall negotiations; and providing client representation when The Crown Estate was not available.
As part of an initiative, we allowed the selected main contractor to undertake a four week intrusive works package for them to assess the structural makeup of the buildings by way of distributing the project and allowing them to provide price and programme certainty.

Key Information

The Crown Estate
Barr Gazetas
Project Manager:
Buro Four
Employers Agent:
Buro Four
Services Engineer:
Quantity Surveyor:
Sweett Group
Structural Engineer:
Waterman Structures

Special Mention

The Crown Estate’s 7 Air Street was recently awarded the BREEAM 2011 ‘Outstanding’ rating and has been hailed as the UK’s most sustainable historic building.
With an impressive score of 94.1%, the building has received the highest award possible from the industry body which judges best practice for sustainability in the built environment.