UK Consultancy Service for Low-Energy, Net Zero & Passivhaus Buildings.

High-level support for architects, developers and local authorities. We combine building physics, 2D & 3D Passivhaus modelling, and advanced simulations to help you design buildings that are efficient, resilient and compliant.

  • Passivhaus modelling (PHPP)

  • Hygrothermal simulation (WUFI)

  • 2D &3D thermal bridge modelling

  • Overheating Risk Part O / TM59 / TM52

  • Airtightness strategy and zoning

  • Envelope and energy efficiency consultancy

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consultancy services

Consultancy

What is included in our
consultancy services

  • Passivhaus Modelling and Optimisation (PHPP)

    • DesignPH and PHPP

    • Energy balance and envelope optimisation

    • Shading & solar gain analysis

    • Airtightness strategy and zoning

    • Overheating risk assessment

  • Building Physics & Performance Simulation

    • Hygrothermal simulation (WUFI)

    • 2D and 3D thermal bridge modelling

    • Condensation & mould risk analysis

    • IES VE dynamic building simulation

  • Low-Energy & Net Zero Building Consultancy

    • Optimisation of construction solutions

    • Cooling strategies for hot climates

    • Expert reports and technical opinions for disputes and litigation.

    • 3D design and calculation of mechanical ventilation systems

    • Carbon footprints and LEED

Benefits

Benefits of the Zepassiv consultancy

  • Risk reduction in the design phase

  • Achieve Passivhaus & Net Zero standards

  • Improve comfort & minimise energy demand

  • Avoid costly changes on site

  • Expert technical team with +20 years of experience

    • Request
    consultancy services

CUSTOMERS

With who
work with

  • Architects

  • Engineers

  • Construction companies

  • Local Authorities & Public Sector

  • Demanding developers

OWN METHODOLOGY

Our dedicated
consultancy services

Request
consultancy services

  • Initial analysis and feasibility studies

  • PHPP / WUFI / thermal bridges modelling

  • Technical workshop with the design team

  • Value engineering

  • Onsite
    support

  • Follow
    up

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consultancy services

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).

  • Multilingual services

    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

  • They renovated my house. They oversaw the entire project and conducted the feasibility study. We're delighted with the result, especially now that it barely uses any energy.

    Home owner

    Spain
  • Read more testimonials

FAQs

Frequent
questions

What is energy consultancy for a Passivhaus project?

It is a technical service that analyses the energy, thermal and hygrothermal performance of the building, optimising design, materials and systems to meet high efficiency standards.

Do I need energy consultancy if I don't want to certify my building?

Yes. Consulting helps to reduce energy consumption, improve comfort and prevent construction defects, regardless of the certification.

What tools do you use for analysis?

PHPP for energy modelling, WUFI for hygrothermal analysis, Flixo/THERM for thermal bridges and TM59 for overheating.

Can you work with my current architect or engineer?

Yes. We join the technical team to support the design and implementation.

Do you offer on-site support?

Yes. We carry out site visits, check details and provide support with airtightness and quality strategies.

Do you operate in Latin America?

Yes, we also work in Latin America.