Beattie Passive Project
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High Quality Product Performance

The Beattie Passive continuously insulated thermal envelope was used in two ways. Firstly, to construct two separate extensions: a 57m² two-storey structure housing a kitchen/dining room on the ground floor and a master bedroom suite on the first floor, and separately over the garage, a bedroom of 28m² would sit on a steel sub-frame erected through the existing garage. Secondly, the envelope would completely ‘tea cosy’ the entire existing 1970’s three-bedroomed house of 120m².

The original house was built circa 1972 of brick and block construction with a truss roof. The walls had a 75mm cavity with no insulation, the roof was insulated between the ceiling trusses with 100mm mineral wool, and the ground floor was a vented suspended timber without insulation. Thermal imaging, smoke testing and air testing were carried out to provide a benchmark upon which to base improvements in airtightness and thermal performance when the project was completed.

The heating was previously via a gas boiler which fed hot air into a space heating system and hot water via a cylinder. Estimated CO² emissions from the house were previously 3,863 kg per annum.

Click on the links below to view the following documents:

» Pre-Beattie Passive Air Permeability Certificate
» Existing and proposed house U-Values
» Mechanical Ventilation with Heat Recovery plans

Site Details

Click the plans below to see the Architects plans for the house.
Planning layouts for

To find out more about the time, cost and environmental benefits of the Beattie Passive Build System, contact us via email, telephone +44 (0)8456 449 003 or visit


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AECBLABCPassivhaus TrustIPHA