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Claire Jamieson co-founded Passivhaus International with Sara Darwin in 2012 to promote Passivhaus.


Sara and Claire studied Architecture & Environmental Design together at Nottingham University. Subsequently qualifying as British Architects, registered with the ARB, they have practised architecture in the UK for over 20 years. Sharing an enthusiasm for modern residential design with sustainable solutions, they are qualified as Certified Passivhaus Designers through the Building Research Establishment in accordance with the Passivhaus Institute.

Phi supports its design philosophy with ‘smart’ architecture. The approach is both sustainable and environmentally responsible design, supported by a strong emphasis on aesthetics and good proportion with the application of Phi Φ.
Passivhaus International is committed to working with clients on an individual basis, to meet their aspirations, brief and budget, with cost efficient design and construction together with personal and inspirational solutions.


Claire Jamieson has formed Phi Architecture in the Northeast to provide a professional architectural service in the Yorkshire regions and beyond which integrates her passion for individual design with sustainable solutions strengthened by her knowledge and understanding of Passivhaus and EnerPhit. Claire specialises in low energy residential architecture from new build to refurbishment/ renovation to extensions as well as offering extensive analysis and understanding of how to improve the Feng Shui and the energy balance of spaces.

Claire will work with her Clients on all sizes and styles of projects, offering new ideas to the table, yet remaining within the parameters of the brief.

Should you have a project in mind, please do not hesitate to get in touch. Claire can tailor the architectural services to suit your needs and budget, across any or all of the RIBA Plan of Work stages. These include concepts, design, planning and building regulation packages, tendering, contractor selection and administration of the contract on site.

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