David Mackay Award for Engineering and Sustainability
For this final award, unusually, and perhaps a reflection of the increasingly mainstream character of sustainability, we have no less than four highly commended projects as well as an overall winner. Each of the commendations are of a particular aspect as follows:
Highly commended for a deep retrofit of a listed building: M H Baillie Scott house

Remodelling and decarbonisation of a house designed by M H Baillie Scott
Remodelling, renovation and thermal upgrade of a grade II Listed house including a single storey extension. The project balances conservation of the fabric and character of this Baillie Scott house while making a significant improvement to energy efficiency and inclusive access.
Client: Private individual
Contractor: Offord and Camp Ltd
Architect for RIBA Stages 0-3: William Fawcett Diane Haigh Architects
Architect for RIBA Stages 4-7: Liz King Architects Ltd
Structural Engineer: Cambridge Architectural Research Ltd
Services Engineer: Joel Gustafsson Consultant Engineers Ltd
Party Wall Surveyor: Wright Party Wall Surveyors
Quantity Surveyor (pre-tender cost plan): Sherriff Tiplady Associates Ltd
Contractor Designed Environmental Services: Eco Installers Ltd
Landvac Glazed renovated windows: Chameleon Decorators Ltd
Bespoke metal gate fabrication: Adams Forge Ely
Roofing: White Roofing
Image credit: Exterior view of the house from the rear garden copyright Matthew Smith
Judges citation:
“We very much admired the way this listed house has been sensitively refurbished and retrofitted for the 21st century while retaining its beauty and significance as one of a small number of surviving Baillie Scott houses in Cambridge. The result is a highly liveable house, full of character and with a fabric-first approach to the retrofit, demonstrating what can be done with a listed building.”