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
Consultancy
What is included in our consultancy services
Passivhaus Modelling and Optimisation (PHPP)
- Full PHPP assessment
Energy balance and envelope optimisation
Shading & solar gain analysis
Airtightness strategy and zoning
Overheating risk assessment
Building Physics & Performance Simulation
IES VE dynamic building simulation
Hygrothermal simulation (WUFI)
3D thermal bridges (Flixo)
Condensation and mold risk analysis
Low-Energy & Net Zero Building Consultancy
Optimisation of construction solutions
Passive design strategies
MVHR design and coordination
Compliance with standards: Passivhaus, EnerPHit, AECB, Net Zero
Experts in off-site timber solutions
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 support with +20 years of experience
Work
Who we work with
Architects
Engineers
Developers
Local Authorities & Public Sector
Self-builders
We
Our dedicated consultancy services
Feasibility studies
PHPP / WUFI / thermal bridges modelling
Technical workshop with the design team
Value engineering
Onsite support
Follow up
Why
Why choose Zepassiv?
International experience in Passivhaus projects and high efficiency buildings
Over two decades of experience in managing both commercial and residential international 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).
Multilingual services
We facilitate communication in international teams or cross-border projects.
Testimonials
What they say our clients
Jesus is an absolute ROCK STAR when it comes to passive house. I can recommend working with the team, whether you need a retrofit assessment, building design, engineering, MVHR design, PHPP, or training to certification.
PureHaus
UKExcellent certification service. They were very helpful and informative throughout the process.
Passive House Home Owner
UKPassivhaus 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
FAQs
Frequent questions
Do you work on Passivhaus and EnerPHit projects?
Yes, we are specialists and we work in the field of certification.
Do you work with manufacturers?
Yes, we liaise directly with manufacturers.
Do you carry out full structural calculations?
Yes, in accordance with CTE and Eurocode 5.
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.
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.