Case study The Rylands Building

© Max Fordham

The mission for this ambitious project was to create a listed building with a net zero carbon status.

A prominent 1929 Grade II-listed empty department store building in Manchester, until recently home to Debenhams, is being converted into an office-led mixed-use development. The proposals include 70,000ft² of retail and leisure space on the ground floor, including a retail arcade accessed from High Street, and 258,000ft² of office space on the upper three floors. Plans also include a 4-storey rooftop extension featuring a further 40,000ft² of offices, plus a winter garden on the sixth floor. Part of the building will be demolished to create an atrium, providing natural light across the second to seventh floors.

To significantly reduce energy consumption, a fabric-first approach has been chosen, using existing fabric wherever possible, as appropriate to the heritage nature of the Rylands Building. Moisture modelling and fabric analysis has also been carried out to achieve an enhanced performance of the listed facades with internal insulation. The roof will be insulated, and high-performance Crittall windows will be installed to match the existing 1930s system.

The building will be future-proofed to access the national benefit of the decarbonising grid and to support the Manchester Zero Carbon Climate Change Action Plan. Improved glazing, internal lining of walls and an insulated roof will substantially reduce energy demand. Electrical systems will be prioritised to make a natural gas connection redundant. Steel framing in the new extension will be standardised to allow dismantling and enable future adaptation of space as well as re-use at the end of life.

MEP services will be designed in a flexible way to minimise equipment redundancy throughout replacement or removal by future tenants during their fit-out.

Operational and embodied carbon analyses and circular economy assessments are being carried out for the strip-out, guiding the choice of any new materials installed. The entire design team is engaged with the embodied carbon analysis. The operational energy strategy will be based on electrification with air source heat pumps for heating and cooling and a mixed-mode ventilation system, maximising ‘free-running’ periods during the year when heating and cooling are not required.

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