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Osborne House, Fulford

Osborne House was a small detached house which had been extended incrementally but was woefully undersized for a family of five, and the energy performance was appalling. The clients looked for ways forward, and initial proposals were prepared for a large extension and energy performance upgrade, but it was still a compromise - circulation became clumsy and it proved impossible to reach the Passivhaus standard.

Agreeing on demolition of the existing house and starting with a clean sheet allowed better energy performance to be built in from the start, using PHPP as a design tool. A simple footprint, with an assymetric section to allow a larger south facing roof (for solar collectors and to shade the south-facing glazing in summer) allowed the Passivhaus annual heating demand of 15kWh/m2a to be achieved.

Sun-path and shading in relation to glazing were modelled using Artlantis so that solar gains and overheating could be balanced, and PsiTherm was used to model the main building envelope junctions and minimise thermal bridging (images below).