Retrofit guides
Plain-English explanations of retrofit roles, building physics and planning for London homes. Written to help you ask the right questions before you commission work.
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Airtightness and ventilation: how they relate
Why reducing air leakage and providing good ventilation go together, how airtightness is measured, and what happens when one is improved without the other.
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Planning a retrofit for a London period property
How to approach energy improvements in a Georgian, Victorian or Edwardian London home – solid walls, timber floors, sash windows, conservation areas and leasehold flats.
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Retrofit assessor, coordinator and designer: roles explained
Who does what in a retrofit project – the assessor, coordinator, designer, installer and evaluator – and why keeping the roles distinct matters.
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What happens during a retrofit assessment?
A step-by-step explanation of a retrofit assessment: what the assessor records, how long to allow, what you should prepare and what you receive afterwards.