Basinghall Street entrance CGI courtesy of Stiff Trevillion

The development will retain 98% of the original structure while eliminating waste. Credit: Stiff+Trevillion

Case study

Stanhope’s all-electric retrofit given go-ahead

Plans for a revamp of Woolgate Exchange in London’s Square Mile will target net zero carbon in both construction and operation.

Developer Stanhope said the nine-storey building, reimagined by architects at Stiff + Trevillion, is on track to become “an exemplar for retrofit” after receiving planning consent from The City of London Corporation.

Woolgate will be all-electric, with no fossil fuel or gas boilers on site, and will procure its energy from 100% green power purchase agreements. In operation, the building is targeting a 4.5* Nabers rating alongside a BREEAM ‘Excellent’ certification.

Woolgate Extension CGI courtesy of Stiff Trevillion

Credit: Stiff+Trevillion

Some 98% of the existing structure will be preserved, which will stop the release of close to 14,000 tonnes of carbon. Similarly, the site aims to divert 100% of waste from landfill.


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The new design also features a 1,500 sq ft rooftop pavilion with views of St Paul’s Cathedral and more than 20,000 sq ft of total terraces to encourage urban greening and biodiversity while providing outdoor space for users.

Mace was announced as main contractor on the site last week and will start construction on the building in the first quarter of the year.

Woolgate Roof Terrace CGI courtesy of Stiff Trevillion

Credit: Stiff+Trevillion

Laura Collins, project director at Stanhope, said: “Woolgate embodies Stanhope’s commitment to delivering assets, investments and developments that actively contribute to the reduction of carbon emissions whilst still providing grade-A office space in the heart of the City of London.

“We look forward to commencing construction this spring.”

With its focus on biodiversity, Woolgate will also become part of the City of London’s Tree Trail, a walk around the Square Mile that showcases the 70-odd species of trees – totalling about 2,500 individual trees – that add a touch of green to the area.

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