AECB CarbonLite Design and Certification
AECB Approved Modeller & CarbonLite Certifier for New Build and Refurbishment Projects We support architects, designers, engineers and developers wishing to achieve AECB CarbonLite certification - in both new build and refurbishment - by providing design review, energy modelling, technical advice and full certification services.
AECB Certified Modeller
AECB CarbonLite Certifier
CarbonLite Standard New Build
CarbonLite Standard Rehabilitation
Passivhaus, Net Zero and Low Energy Design Consultancy

Consultancy
What is the standard AECB CarbonLite?
AECB Design Review We evaluate your project from the initial stages to ensure compliance:
- Insulation and envelope strategy
Thermal bridges
Airtightness
Ventilation and heat recovery
AECB energy modelling Advanced energy simulation to validate design:
PHPP / PHribbon
Overheating analysis
Energy optimisation
Comparison of solutions
AECB CarbonLite Certification Complete management of the certification process:
Technical verification
Condensation risks
Delivery of final certification
Specialised technical consultancy
Carbon footprints and LEED
Benefits
Benefits of the AECB certification with Zepassiv
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Improving the energy performance of the building
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Increased thermal comfort and interior quality
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Emission and consumption reduction
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Early design optimisation
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More affordable alternative to Passivhaus
Work
Who we work with
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Architectural studios

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Engineering

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Rehabilitation equipment

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Local Authorities & Public Sector

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Demanding developers

We
Our process
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Initial project analysis
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Energy modelling
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Development and coordination
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Technical verification
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On-site monitoring
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Final certification
Why
Why choose Zepassiv?
High technical specialisation
Passivhaus, WUFI, thermal bridges, air-tightness
AECB certified experts
Recognised modellers and certifiers
Fully collaborative approach
We work with your team from the start
Risk reduction by design
We identify thermal bridges, damp, overheating and construction problems before they appear on site.
Integral Approach
From design to certification
International experience
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.
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 KingdomIts bilingual team greatly facilitated international coordination.
Promoter
SpainIts bilingual team greatly facilitated international coordination.
Architect
United Kingdom
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?
Sí trabajamos en Latinoamérica también.








