4D Studio Architects was commissioned to refurbish and restore a rooftop apartment in the heart of Mayfair. The internal layout was improved, swapping the location of the second bedroom with the kitchen, so that an open plan space with living areas all flowing into each other could be created. 4D Studio Architects created a more modern look for the apartment by replacing carpets with timber flooring, and completely modernising internal bathrooms and services. The energy usage was reduced by replacing the existing sashes with double glazed units and installing a modern low energy boiler. As the apartment is located in the Mayfair Conservation Area, planning permission for the replacement of windows and new skylight had to be obtained.