A whole house refurbishment and extension of a 1950’s house in Bristol using Passivhaus principles. The existing property is built into a steep slope, overlooking a grade II listed park. The accommodation stretches over ground and first floor with a lower ground floor containing the utility and sun room. The new extension converts the lower ground floor semi basement area into an open plan kitchen/dining area with independent pantry. At ground floor the extension houses a self contained artist’s studio.
The thermal performance of the existing building fabric has been improved through the application of external wall insulation, under floor insulation, additional loft insulation and new triple glazed windows and doors. High levels of airtightness are combined with a mechanical ventilation and heat recovery system, (MVHR) to extract air from kitchens and bathrooms and use this to pre heat fresh air delivered to the bedrooms and living spaces to reduce heat loss. The majority of hot water will be provided by solar thermal panels located on the roof with backup heating via a small gas boiler that will also cover the small amount of space heating required in the colder months.
Although the project is not Passivhaus certified, energy modelling has shown it will reach the Passivhaus refurbishment EnerPhit standard. The client kept a blog as the project progressed which can be seen here: Here. Following completion theclient continues to monitor the energy use of the building to check it is performing as designed.