The Tin Barn Retrofit

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Refurbishment of two listed adjoining barns to the Passivhaus EnerPhit standard.

Our Role: Passivhaus Consultant RIBA Stages 4-7 appointed by client

The project involved the conversion of two derelict barns into an energy efficient and low carbon home for our clients. The planning permission, which was already in place when the clients’ bought the site, determined that the new home would conform to the original form of the barns and that some of the original steel and stone walling would remain in place. These were amongst the major challenges for the project.

We collaborated closely with the design team to create timber frame and building services designs that meet EnerPHit standards, using designPH and PHPP to guide the process. Our support extended to the construction team, focusing on airtightness, insulation, and evidence collection. The building achieved an exceptional airtightness of 0.36 m³/hr @ 50 Pa (0.35 air changes per hour), a remarkable result for a complex project and CRD Bath’s first attempt. The building is fully electric, powered by a Mitsubishi Ecodan heat pump.