What is PAS 2035:2019?

PAS 2035:2019 Retrofitting dwellings for improved energy efficiency was developed to complement PAS 2030:2019.  It is the new overarching document in the retrofit standards framework, which specifies the requirement for a holistic approach to the retrofitting of existing domestic buildings.

It requires a proper assessment of the dwelling – including building pathology, energy modelling and calculations, ventilation strategy, interactions between energy efficiency measures matrix, testing & commissioning requirements, and monitoring & evaluation – to develop proposals and specifications appropriate for dwelling-specific projects following a whole-house approach to domestic retrofit.


PAS 2035:2019 Principles

PAS 2035:2019 is designed to shape the retrofit process that will be scaled-up in order to deliver deep retrofit to around 27 million homes across the UK over the next thirty years, introducing two core principles:

  • Fabric First: insulating buildings to reduce heat demand as low as possible, whilst ensuring that newly airtight homes are also properly ventilated to avoid problems with damp and indoor air quality.
  • Whole House Retrofit: whilst addressing the fabric first, we should be creating retrofit plans for homes that consider fabric, services and renewables together. Only by doing this will we be able to deliver homes that achieve their potential in terms of carbon savings.

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