35 Fountain Street low‑carbon office: embodied carbon lessons for designers
Reviewed by Joe Ashwell
First reported on The Construction Index
30 Second Briefing
GMI Construction Group and Bywater have topped out the 35 Fountain Street redevelopment in Manchester, retaining the existing steel frame and adding three new upper floors in a low‑carbon cross‑laminated timber (CLT) hybrid structure. The 87,000 sq ft Grade A office scheme, spanning a basement plus nine upper floors and delivering about 16,000 sq ft of additional workspace with roof gardens, records upfront embodied carbon of 371kgCO₂e/m² versus roughly 1,000kgCO₂e/m² for a typical new build. Responsibly sourced timber is expected to sequester about 618 tonnes CO₂e, with the project targeting BREEAM Outstanding, NABERS 5 star, WELL Platinum and EPC A by summer 2027.
Technical Brief
- Upfront embodied carbon reduction of 629kgCO₂e/m² versus typical new build materially cuts structural lifecycle emissions.
- Responsibly sourced timber is calculated to sequester 618 tonnes CO₂e over the building’s design life.
- Joint venture structure is 50:50 between Bywater and Greater Manchester Evergreen 2 Limited Partnership.
- Senior development finance is provided by North West Evergreen LP, backed by Greater Manchester Combined Authority.
- Grade A office provision totals 87,000 sq ft, with around 16,000 sq ft created by the vertical extension.
Our Take
GMI Construction Group’s work at 35 Fountain Street adds a low‑carbon office to a recent run of complex refurbishments and mixed-use builds in the North of England, such as the Canvas Building PBSA in Manchester and the George Hotel renovation in Huddersfield, signalling a contractor comfortable with both heritage and high‑performance envelopes.
The 371 kgCO₂e/m² upfront embodied carbon and 5‑star NABERS target put 35 Fountain Street towards the leading edge of office performance in our infrastructure database, which may set a benchmark for other Greater Manchester Combined Authority-backed schemes seeking to demonstrate tangible decarbonisation outcomes.
The 50:50 joint venture between Bywater and Greater Manchester Evergreen 2 Limited Partnership, with Evergreen and North West Evergreen LP linked to GMCA, underlines how public-backed revolving funds are now directly shaping low‑carbon commercial stock in central Manchester rather than just enabling enabling infrastructure at the city fringe.
Prepared by collating external sources, AI-assisted tools, and Geomechanics.io’s proprietary mining database, then reviewed for technical accuracy & edited by our geotechnical team.
