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Passivhaus  Certification

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
Passivhaus Certification

PASSIVHAUS CERTIFICATION

What is the
Passivhaus Certification?

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

  • Ensuring:

    • 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 assesses:

    • Energy demand

    • Airtightness of the envelope (n50)

    • Thermal performance of the envelope

    • Ventilation design and performance

    • Overheating risk

  • 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.

    • On-site support, inspection and monitoring to ensure that Passivhaus certification is achieved.

Benefits

Passivhaus classes Passivhaus

  • Passivhaus Classic, Plus and Premium

  • Passivhaus EnerPhit Certification

  • Passivhaus LEB certification

  • Other sustainability certifications

    • Request
    passivhaus certification

OUR CLIENTS

Who do we
work with

  • Architects

  • Engineers

  • Local Authorities & Public Sector

  • Public authorities

  • Developers

ZEPASSIV

Our
process

Request
preliminary certification study

  • Preliminary analysis and technical feasibility

  • On-site inspection

  • On-site inspection

  • Blower door test

  • Final certification

  • Follow up support

Request
technical consultancy

ZEPASSIV

Why work
with us?

  • 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).

  • Multilingual service

    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 Zepassiv supports professionals in
developing sustainable, Passivhaus-certified projects.

Accredited Passivhaus 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 our clients
say about us

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

    Passivhaus Homeowner

    UK

  • Zero Energy has been a fantastic team to work with! They have provided extensive assistance in certifying our Passivhaus project and have been attentive throughout the entire process. We will definitely want to work with them again in the future at Clive Chapman Architects, and we highly recommend them to anyone who needs their services!

    Clive Chapman Architects

    UK

  • I was the client, and from the client's perspective, everything went very smoothly.

    Bill Haygarth- Homeower

    UK
  • Read more testimonials

FAQs

Frequently asked
questions

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

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

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

It conducts thorough reviews during the design phase and on-site inspections, gathers evidence, and ensures construction quality.