Grosvenor’s First Net Zero Carbon Office Development Starts on Site


Holbein Gardens sets a new benchmark for sustainable workplaces and building retrofit

Holbein Gardens is a redevelopment and one storey extension of a 1980s office building off Sloane Square, creating a 25,000 sq ft modern workplace constructed within the UKGBC’s net zero carbon buildings framework.

All contractors and advisors on the project have been challenged to help Grosvenor deliver against its goals of net zero carbon, zero waste and a significant biodiversity gain.

The designs by Barr Gazetas, which centre on retaining the existing four-storey structure, re-use of materials and the introduction of extensive greening, will be delivered by Blenheim House Construction.

Philip George, Project Director, Grosvenor Britain & Ireland commented: “By making environmental performance central to our success factors from day one, we’re now proving the huge potential for transforming outdated offices into exemplary zero carbon workspaces.

“The work put in by the whole team to drive down embodied and operational carbon has created a new benchmark for building adaptation and retrofit in London.”

An early whole life carbon assessment minimised upfront embodied carbon, meaning the development will exceed the LETI Pioneer Project embodied carbon target of 500kgCO2/m2.

In achieving this, Grosvenor has focussed on façade retention and trialling new low embodied carbon products including cross-laminated timber in the extension, CEMFREE Concrete, Thermalite aircrete blockwork, and reclaimed raised access flooring. Grosvenor is re-using existing steelwork from the building in addition to re-purposing steels from the business’ Bermondsey site.

Zero waste will be sent to landfill and strip out waste will be traded on re-use marketplace Globe Chain.

The in-use energy efficiency of the all-electric scheme will be enhanced through effective lighting and mechanical equipment, on-site renewable energy generation, blue roofs and sustainable urban drainage systems.

Biodiversity is significantly enhanced through the extensive landscaping and greening of over 11% of the building’s gross sq ft.

Holbein Gardens is also helping drive forward industry knowledge on delivering low carbon buildings and is acting as a LETI Pioneer Project, a Design for Performance Pioneer Project and is aligned to NABERS methodology.

Grosvenor is targeting BREEAM Outstanding, WELL Gold and Wired Score Gold certifications for the completed project.

Notes to Editors


About Grosvenor Britain & Ireland:

Grosvenor Britain & Ireland creates great places where communities, business and nature thrive.

In London’s West End, we support c11,000 residents, c1,000 businesses and c60,000 workers every day. We also create and manage sustainable neighbourhoods in London, Liverpool and across the South East of England.

We are one part of a global, family-owned business that has pioneering change and new ways of thinking about property for over 340 years.  Thinking long term allows us to give equal weight to the environmental, social and commercial impact of everything that we do.

Follow us on:

Twitter: @Grosvenor_GBI

LinkedIn: Grosvenor Group

About our environmental sustainability goals

We are working to a series of ambitious environmental sustainability goals:

  • Zero carbon: By 2030, we will achieve net zero carbon from its buildings, developments and supply chain. Our full portfolio will be climate positive before 2050.
  • Zero waste: By 2030, we’ll send zero non-hazardous waste to landfill from our buildings and developments in our control.
  • Valuing nature: By 2030, our portfolio will have achieved a significant net biodiversity gain. By 2050, we will be water neutral.
  • Bringing our partners with us: By 2030 all our suppliers will be compliant with our Supply Chain Charter through collaboration, innovation and supportive networks.

In December 2020, we published Think Zero, our pathway to achieving net zero carbon by 2030. In 2021, this was validated by the Science Based Targets Initiative and we joined Race to Zero.

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