Farmhouse Retrofit

This project involved the retrofit and reordering of a traditional Devon farmhouse, along with the addition of a new extension. The existing walls were built of solid 600mm thick stone with a cement render. The home was cold, damp, draughty and expensive to heat.

 

It is important to maintain vapour permeability ('breathability') and so materials such as limecrete were specified, along with insulated lime plaster and removal of the cement based external render. The insulation and airtightness improvements allowed for the installation of an air source heat pump to replace the original oil boiler. ​

 

PHPP energy modelling was carried out to assess the building’s performance and inform a phased ‘Medium Term Retrofit Plan’ that could work with the traditional construction. Strategy drawings were developed to address insulation, ventilation, airtightness, and moisture management, supported by detailed build-ups for walls, roof, and floors. Comprehensive technical design information was prepared to guide the contractor during construction and support Building Regulations approval. The retrofit plan provided a clear, long-term strategy for improving the building fabric and delivering enhanced energy performance over time.