The Mayfield house consists of the main house and a workshop outbuilding which comprises this project. The concept behind the retrofit of the workshop building was to bring it up to a fully inhabitable finish to enable its use as a 'hobby' house. The retrofitting work included over-cladding and completing the external envelope to a highly sustainable standard; adding new windows to the North and West facades and an additional rooflight for the mezzanine study area and replacing some of the fixed rooflights with openable ones. An new outdoor deck was created at the same level as the internal floor finish. A ground source heating system provides sustainable heating for the barn and the main house.

Planning permission for alterations to the outbuilding within the High Weald AONB was granted by Wealden District Council in April 2020 and the project was completed in 2023.

The existing house had two entrances from the road that created a lack of privacy for the main house. The new landscape plan omits one, creating further privacy for the main house, a larger parking area and an increased green area in front of the outbuilding. There is a new kitchen garden beside the main house and a new flower garden between the main house and outbuilding, reducing the area of hardstanding.