Park Hill, a grade II* listed brutalist housing scheme in Sheffield containing 1000 homes, is Europe’s largest listed building. Urban Splash took on its regeneration in 2004. Its exposed concrete frame: a significant aspect of its listing; is also a cold bridge. Low floor-to-ceiling heights present another challenge to its retrofit. A thermal model created by our consultant Greengauge informed us where to add insulation most effectively. Each room has an insulated floor and ceiling to achieve the best thermal performance. Externally coloured, insulated render panels cover concrete elements. Our approach was to retain as much of the existing fabric as possible and upgrade it to the highest achievable standards. Bricks have been cleaned, mortar retained, and party walls upgraded acoustically.