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

  • Risk of overheating

  • Airtightness strategy development

  • Envelope and energy efficiency consultancy

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technical consultancy

Consultancy

What is included in our
energy consulting

  • Passivhaus Modelling and Optimisation (PHPP)

    • Modelado completo en PHPP

    • Energy balance and envelope optimisation

    • Shading & solar gain analysis

    • Airtightness strategy development

    • Overheating analysis (PHI criteria / TM59)

  • Building Physics & Performance Simulation

    • Hygrothermal simulation (WUFI)

    • Puentes térmicos 3D (Flixo/THERM)

    • Análisis de condensación y riesgo de moho

    • Summer comfort and overheating risk

  • Low-Energy & Net Zero Building Consultancy

    • Optimisation of construction solutions

    • Estrategias de diseño pasivo

    • Ventilación natural y mecánica

    • Cumplimiento de estándares: Passivhaus, EnerPHit, AECB, Net Zero

Benefits

Benefits of the Zepassiv consultancy

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technical consultancy

  • Risk reduction in the design phase

  • Achieve Passivhaus & Net Zero standards

  • Improve comfort & minimise energy demand

  • Avoid costly changes on site

  • Expert technical support with +10 years of experience

    • Request
    technical consultancy

Work

Who we
work with

  • Architectural studios

  • Engineering

  • Promoters

  • Local Authorities & Public Sector

  • Self-promoters

We

Our
process

Request
technical consultancy

  • Preliminary analysis and risks

  • PHPP / WUFI / thermal bridges modelling

  • Technical workshop with the design team

  • Optimisation of solutions

  • Support in
    specification

  • Support
    during the work

Request
technical consultancy

Why

Why choose
Zepassiv?

  • International experience in Passivhaus projects and high efficiency buildings

    More than a decade 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/THERM, TM59, comfort analysis and building physics.

  • Fully collaborative approach

    We work closely with architects, engineering and construction companies, facilitating technical decisions at all stages of the project.

  • 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.

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

  • With Zepassiv we were able to certify our first Passivhaus project in an agile and uncomplicated way.

    Architect

    United Kingdom

  • Its bilingual team greatly facilitated international coordination.

    Promoter

    Spain

  • Its bilingual team greatly facilitated international coordination.

    Architect

    United Kingdom
  • Read more testimonials

FAQs

Frequent
questions

Yes, we operate throughout Spain and Latin America

AeroBarrier seals invisible leaks and micro-leaks that cannot be detected by hand.

Yes, training is included.

Yes, it allows you to obtain n50 values that meet Passivhaus criteria.

Yes, we are specialists and we work in the field of certification.

Yes, we provide technical support throughout the project.

Yes, we liaise directly with manufacturers.

Yes, we work on both the structure and energy efficiency at the same time.

Yes, in accordance with CTE and Eurocode 5.

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

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.

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.

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

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

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

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

Sí trabajamos en Latinoamérica también.