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Is self-certification only be for retro-fit works?

Yes, the CarbonLite Retrofit course enables you to self-certificate retrofits only. The existing AECB  Silver certification is probably the closest equivalent for new build, and there is of course overlap in terms of key principles such as ventilation, insulation, air quality etc. However, existing standards for new build don’t cover the ins and outs of existing buildings and the range of issues that they sometimes can present before, during and after retrofit. Hence, this course focuses on achieving suitable energy targets for retrofit while at the same time considering the health of the building and the occupants.