Claiming Passivhaus

The Passivhaus standard represents one of the strongest, clearest claims a building project can make: that it delivers exceptional energy efficiency, comfort, and performance — backed by rigorous modelling, detailed criteria, and independent quality assurance. In the UK, however, such claims are sometimes made without meeting the full requirements, risking confusion, greenwash, or even legal challenge.

This updated technical briefing sets out exactly what it means to claim Passivhaus, and why it matters. With new consumer protection laws now in force under the Digital Markets, Competition and Consumers Act 2024, misleading environmental claims face tougher scrutiny. This fourth edition of Claiming Passivhaus offers clear guidance to help clients, designers, and developers ensure their claims are accurate, robust, and compliant — and to safeguard the value and credibility of the standard itself.

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