The AECB CarbonLite Standards: Guidance for Certifiers gives full guidance to those assessing and certifying projects to the AECB CarbonLite Standards.
The guidance covers certification, PHPP modelling, airtightness and ventilation, heating systems, thermal bridging and fRsi, and the requirements for CarbonLite Retrofit, Step-by-Step Retrofit and New Build projects.
The latest Version 9 guidance, published 21 November 2025 can be viewed or downloaded below.