Passivhaus Affiliate

Standard Members

Membership of the Passivhaus Trust is open to anyone and does not necessarily imply achievement of the Passivhaus standard for buildings or components, or attainment of Passivhaus-related qualifications. Members of the Passivhaus Trust listed include architects, consultants, contractors, manufacturers and other industry professionals, as well as individuals, who support the work of the Trust in promoting the Standard in the UK.

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Oberlanders Architects LLP



Octavo Ltd



Ogel One Ltd


Ogilvie Group Ltd



One Planet Architecture


Optimum Architecture Ltd

Nr Colchester

Optimum Architecture was founded by Stuart Davis MCIAT, Certified Passivhaus Designer. We offer our services to suited clients to utilise our skills, experience and passion to design and realise a high quality, low energy project, either residential or commercial. Our experience enables us to provide our clients with designs that fulfil their requirements whilst achieving high quality architectural solutions. The Fabric First approach will achieve a premium standard of construction, superb comfort and low running costs. If you have a project that would benefit from our service then we would be pleased to discuss your requirements with you.


Oxford Housing Company Ltd