Wilmcote House Residential Refurbishment


Wilmcote House is an award winning refurbishment and was the largest occupied building to target EnerPHit in the world.

Location: Portsmouth

Client: Portsmouth City Council

Project Value: £13.5m

Specialisation: EnerPHit

Wilmcote House involved the refurbishment of three 11-storey linked residential blocks to the Passivhaus EnerPHit standard. As such the building has been clad in high quality non-combustible mineral wool insulation and all of the homes have been fully compartmented thereby preventing the spread of fire between flats both internally and externally. 

The success of this project has been studied by both Southampton University and the LSE – with Southampton University monitoring the building’s thermal performance before and after the project’s completion, and the LSE surveying residents before, during and after the works to understand the challenges and benefits of working with residents in-situ, and what impact the project has had on their lives. 

A year into completion, Southampton’s monitoring of the flats showed a significant increase in thermal comfort and reduced energy use, whilst the LSE report captured resident positivity satisfaction. An important step for the improvement of affordable homes, Wilmcote House continues to be presented and published within the press, and recognised by awards. 


  • Winner: RICS Awards – Design Through Innovation category  
  • Winner: RICS Awards – Regeneration category  
  • Winner: Constructing Excellence Awards – Sustainability Category  
  • Winner: SHIFT Awards – Best Retrofit Project  



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