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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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Zac Nicholson



Zehnder Group UK


Zehnder Comfosystems provides a unique approach to indoor climate control introducing Eco-conscious homeowners to the benefits of integrated whole house solutions and a unique approach to controlling the indoor climate. With a choice of options ranging from heat recovery and comfort ventilation, to the ComfoBox which can provide heat recovery, ventilation, heating, cooling and hot water in one compact unit, there is a solution for every homeowner looking to maximize the energy efficiency and comfort of their home. Our experienced team is on hand to guide our customers from specification right through to installation, after sales service and advice, ensuring that Zehnder Comfosystems remains synonymous with quality, reliability and trust.


Zero Energy +Passivhaus


Zero Energy is an international engineering practice specialising in Passivhaus buildings. The company was initially set up in 2011 in the Scottish Highlands by Dr Jesus Menendez. At Zero Energy, we use advanced building physics knowledge in the building industry to help our clients to achieve low-energy and healthy buildings. We are an accredited Passivhaus course provider using the official and updated PHI material for Passivhaus Designers, Passivhaus Tradespeople and the new Passivhaus PHPP Expert course . We are Passivhaus building certifiers since 2017 for any Passive House project around the world. To date, we have been involved in more than 50 certified projects around the world. We also undertake third-party non-destructive testing, such as Blowerdoor tests, extinguishing gas retention time tests, infrared thermography, in situ U-value measurement for the building envelope or compensated airflow measurement in ventilation systems using balometers.