The UK retrofit standard sounds technical, but it exists to protect you. Here is what it means in practice.
PAS 2035 is the British standard for retrofitting domestic buildings for energy efficiency. It sets out how a whole-house assessment should be carried out and how measures should be designed and installed.
Whole-house thinking
The core idea is simple: you cannot change one part of a building without affecting the rest. Add insulation without considering ventilation and you risk condensation. PAS 2035 forces that thinking into the process.
What it means for your project
You get a documented assessment, a designed solution rather than a guess, a clear ventilation strategy and an installer who is accountable for the outcome. For grant-funded work, following the standard is mandatory.
Why it matters
Most retrofit failures in the UK trace back to poor detailing and ignored ventilation. Working to the standard is the most reliable way of avoiding them.
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