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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 Retrofit

  • Passivhaus, Net Zero and Low Energy Design Consultancy

Request Consultancy Services

Consultancy

What is
AECB CarbonLite?

  • AECB Design Review We assess your project from the early stages to ensure compliance:

    • Insulation and airtightness strategy

    • Thermal Bridges

    • Airtightness

    • Ventilation and heat recovery

  • AECB Energy Modelling Advanced energy simulation to validate the design:

    • PHPP / PHribbon

    • Overheating analysis

    • Energy optimisation

    • Comparison of solutions

  • AECB CarbonLite Certification Comprehensive management of the certification process:

    • Technical verification

    • Condensation risk

    • Delivery of final certification

    • Specialist technical consultancy

    • Carbon footprint and LEED

Benefits

Benefits of the AECB certification with Zepassiv

  • Improving the building’s energy efficiency

  • Greater thermal comfort and indoor quality

  • Reducing emissions and fuel consumption

  • Design optimisation from the early stages

  • A more affordable alternative to Passivhaus

    • Request
    consultancy

CLIENTS

Who do
we work with

  • Architecture studios

  • Engineers

  • Retrofit teams

  • Public companies

  • Builders and developers

Zepassiv

Our
process

Request
consultancy services

  • Initial project analysis

  • Energy modelling

  • Development and coordination

  • Technical verification

  • On-site monitoring

  • Final certification

Request
technical consultancy

Why

Why work
with us?

  • 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 outset

  • 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 make communication easier in international teams and 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.

Certified 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.

Check our training

Testimonials

What our clients
say about us

  • 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, Homeowner

    UK

  • Amazing technology—it's hard to get it to work, but it's great when it does.

    Matthew Craig, Homeowner

    UK
  • Read more testimonials

FAQs

Frequently asked
questions

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

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

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

Yes. We conduct technical site visits, verify details, and provide support for airtightness and quality strategies.

Yes, we also operate in Latin America.

This is a technical service that analyses a building’s energy, thermal, and hygrothermal performance, optimising its design, materials, and systems to meet high-efficiency standards.