A rear extension and loft conversion to a modest Victorian terrace house in Lewisham. The project evolved through a process of co-creation with the clients who were keen to contribute to all parts of the design process. The project is defined by bold use of colour, patterns and materials reflecting the playfulness of both design team and clients. The extension is clad internally and externally with cork that complements the existing brickwork on the original house and will weather to a silvery-grey over time. The cork achieves all required u-vales without the need for any additional expanded foam insulation.