Passivhaus Affiliate

What is Passivhaus?

The Passivhaus Standard

Why Passivhaus?

How to achieve Passivhaus


No planet BBuildings are a significant culprit of carbon emissions – accountable for 35% of total global energy consumption. Backed with over 30 years of international evidence, Passivhaus is a tried & tested solution that gives us a range of proven approaches to deliver net-zero-ready new and existing buildings optimised for a decarbonised grid and augmented for occupant health and wellbeing. Passivhaus buildings provide a high level of occupant comfort using very little energy for heating and cooling.

Passivhaus adopts a whole-building approach with clear, measured targets, focused on high-quality construction, certified through an exacting quality assurance process. For more on why adopting an efficient first approach is cruicial to meeting carbon targets, check here.

EnerPHit is a slightly relaxed standard for retrofit projects, where the existing architecture and conservation issues mean that meeting the Passivhaus standard is not feasible.

What is the Passivhaus standard? 

Passivhaus goes Personal: Video credits

Key Concepts

What is Passivhaus: Key Concepts


Why Passivhaus?

Why Choose Passivhaus

It is important to understand the value & sound business case for building to the Passivhaus Standard; it is so much more than just world-leading energy efficiency and thermal performance. There are several benefits, and many are interconnected – creating a catalyst for positive effects. Low energy bills, constant fresh air, superior internal comfort, peaceful and quiet interiors - the list goes on. Learn why the Passivhaus approach is good for people and the planet. Get more detail in our Passivhaus benefits guide coming soon.


The heat losses of the building are reduced so much that it hardly needs any heating at all. Passive heat sources like the sun, human occupants, household appliances and the heat from the extract air cover a large part of the heating demand. The remaining heat can be provided by the supply air if the maximum heating load is less than 10W per square metre of living space. If such supply-air heating suffices as the only heat source, we call the building a Passivhaus.

Prof. Dr Wolfgang Feist  Director of the Passive House Institute, Darmstadt, Germany


Discover more:

By Projects

2021 UK Passivhaus Awards Ceremony
UK Passivhaus by project sectors UK Passivhaus project gallery UK certified Passivhaus projects via map

By PHT campaigns

Passivhaus Retrofit Masterclass lecture series
Passivhaus Social Housing Passivhaus goes Personal: Self-build campaign Passivhaus for Educational Buildings: University Procurement



How to achieve the Passivhaus Standard in the UK

 To achieve the Passivhaus Standard in the UK typically involves:

  • very high levels of insulation
  • extremely high performance windows with insulated frames
  • airtight building fabric
  • 'thermal bridge free' construction
  • a mechanical ventilation system with highly efficient heat recovery


Performance targets for a European climate




Primary energy demand

≤ 120 kWh/m2. yr

≤ 120 kWh/m2. yr + heat load factor

Space heating demand

≤ 15 kWh/m2. yr

≤ 25 kWh/m2. yr

Space cooling demand

≤ 15 kWh/m2. yr

≤ 25 kWh/m2. yr

Specific cooling load

≤ 10 W/m2

≤ 10 W/m2


 ≤ 0.6 air changes/ hr @ n50

≤ 1.0 air changes/ hr @ n50

All Passivhaus projects must use the design tool Passive House Planning Package (PHPP.) More information and detailed critieria on the different Passivhaus classes, Classic, Plus, & Premium, can be found here.

 ‹ Back to top


Claiming the Passivhaus Standard in the UK

The Passivhaus Trust recommends that the best way to achieve quality assurance for a Passivhaus project is through certification by a registered Passivhaus Certifier. It is reasonable to claim that a building is a self-declared Passivhaus provided that it still satisfies all the requirements of the standard. Read more about this in our technical briefing paper 'Claiming the Passivhaus Standard.'


   ‹ Back to top



Over thirty years of experience demonstrates that the high levels of comfort and energy savings associated with the Passivhaus Standard is achieved through independent quality testing. All certified Passivhaus buildings undergo a rigorous compliance process. Certification is also available for specific components, Designers/ Consultants & Tradespeople.

Passivhaus Certification: Projects, People, Products

Building Certifiers: A number of UK organisations have been approved to assess and issue the quality assured Passivhaus Certificate. These organisations must be separate to the main design team and provide impartial verification that all Passivhaus criteria has been satisfied.  Details of who can provide Passivhaus certification can be found here.


Building Certification Process:

Certification Process Flow Chart

   ‹ Back to top


Never miss UK Passivhaus news by joining the Passivhaus Trust mailing list                                                                                              Follow us on twitter @PassivhausTrust