Certification 
Passivhaus

We collaborate with architects, developers, contractors, and local authorities on new-build and EnerPHit projects across the residential and commercial sectors, supporting them throughout the entire Passivhaus certification process, from early-stage design to final onsite verification.

  • Passivhaus Classic, Plus and Premium certification

  • EnerPHit for renovation and historic buildings

  • Official Passivhaus certificate issued by approved body

  • Extensive international experience since 2010

  • Leaders in certification of educational and office buildings

Request
technical consultancy

Consultancy

What is the
reliable partner

Passivhaus Certification is an independent quality assurance process that ensures a building meets the rigorous performance requirements of the Passivhaus Institute (PHI).


  • Guaranteeing:

    • Extremely low energy consumption

    • Thermal comfort and indoor air quality

    • Absence of condensation and mould

    • Healthy environments with a high level of soundproofing

    • High quality construction

  • The process evaluates:

    • Energy demand

    • Air tightness of the enclosure (n50)

    • Thermal performance of the envelope

    • Ventilation design and performance

    • Limits the risk of overheating

  • Our Role

    • We assist the client with technical or economic feasibility studies

    • We provide support to the design team

    • We verify the work of the Passivhaus consultancy. We offer on-site support to the construction company.

    • Guiding, modelling, verifying and inspecting until you get your Passivhaus Passivhaus.

Benefits

Types of certification Passivhaus

  • Passivhaus Classic, plus and premium

  • Passivhaus EnerPhit Certification

  • Passivhaus LEB certification

  • Mixed certifications 

    • Request
    technical consultancy

Clients

With who
work with

  • Architectural studios

  • Engineering

  • Construction companies

  • Local Authorities & Public Sector

  • Demanding developers

ZEPASSIV

Our
process

Request
preliminary certification study

  • Preliminary analysis and technical feasibility

  • Support for Passivhaus Designers

  • On-site inspection 

  • Blower door test (Blower Door)

  • Final certification 

  • Support

Request
technical consultancy

ZEPASSIV

Why choose
Zepassiv?

  • International experience in Passivhaus projects and high efficiency buildings

    More than two decades working in Spain, UK and Portugal, with residential, public and private projects.

  • Passivhaus, EnerPHit and energy efficiency certified consultants

    Multidisciplinary team proficient in PHPP, WUFI, Flixo/IES VE, TM59, comfort analysis and building physics.

  • Fully collaborative approach

    We work side by side with architects, engineering and construction companies, facilitating technical decisions in all phases of the project and assisting on site.

  • Risk reduction by design

    We identify thermal bridges, damp, overheating and construction problems before they appear on site.

  • Cost and performance optimisation

    We propose viable, efficient solutions aligned with energy objectives, regulations and certification (Passivhaus, EnerPHit, AECB, Net Zero).

  • Trilingual service (ES / EN / PT)

    We facilitate communication in international teams or cross-border projects. Zepassiv is active in 15 countries.

Portfolio

Some of our
recent projects

Find out how to Zepassiv accompanies professionals on the
development of sustainable projects and Passivhaus certificates.

Accredited vocational training to transform the sector.

As certified consultants and trainers, we believe that training is key to driving real change. Our programmes help professionals to successfully apply Passivhaus principles in their projects.

Discover our training

Testimonials

What they say
OUR CLIENTS

  • Excellent certification service. They were very helpful and informative throughout the process.

    Brendan Powell, Passivhaus Home Owner

    UK

  • Passivhaus Certifier with extensive practical experience, able to support the project from early engagement all the way to the end of it.

    Lucia Savastano, Cundall

    UK

  • I chose Zero Energy + Passive to certify my house with the Passive House Standard, and the experience exceeded all expectations! Being their first project in Portugal, they delivered incredible service—they are fast, accurate, reachable and always constructive. Thanks to their expertise and dedication, we achieved the Passive House Plus certification, an amazing milestone that I'm extremely proud of. I highly recommend Zero Energy + Passive to anyone looking for excellence in Passive House certification!

    Pedro Vicente, Passivhaus Plus Home Owner

    Portugal
  • Read more testimonials

FAQs

Frequent
questions

Does Zepassiv issue certificates outside UK?

Yes: we provide certification services worldwide, with projects in the United Kingdom, Ireland, Portugal, Chile, Mexico, Australia and the Middle East.

Is a leak test mandatory?

Yes, it is an essential requirement for obtaining the certificate.

What does a Passivhaus inspector do?

It carries out thorough reviews during the design phase and on-site inspections, gathers evidence and ensures the quality of the construction work.

What is a Passivhaus certifier?

A highly qualified professional who checks and verifies that the project meets the standard and issues the final certificate on behalf of the Passive House Institute.