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PAS 2035 (2023) Release: Key Information and Changes
Elmhurst Energy Systems Ltd

PAS 2035 (2023) Release: Key Information and Changes

The latest version of PAS 2035 (2023) has been published, featuring a number of important updates for retrofit professionals across the UK.


The Elmhurst Energy team has reviewed the updated standard and has provided a summary of the important details below. Understanding the relevant details and changes in the PAS 2035 update is vital for the future implementation of the document – both for the assessment process and the internal auditing process.

The below summary is broken into sections, with references to the relevant pages and clauses located within the full document.

The Risk Path procedure has been removed. Changes have been applied to various factors, for example to the Retrofit Designer qualification requirements based on the number of measures being installed. (see later comments).

Traditional Construction definition has been updated and expanded. (Page 5).

A medium-term improvement plan is now required for all properties (5.3.1 & 8.1).

Scope has been added to cover distressed replacement of heating appliances (7.2).

The Retrofit Assessor report, where appropriate, will cover additional issues that may impact the project now and in the future (7.3.2.I).

The design criteria for airtightness/leakage strategy has been updated. Where EEMs improve the building fabric, an airtightness/leakage strategy is required. Should an airtightness target be set in this strategy, compliance must be proved by means of a test. Note, that an airtightness target is not mandatory if not set in the strategy. (8.2.35, & 8.2.36).

The Retrofit Coordinator shall collect evidence to satisfy them that the installation of EEMs has been undertaken correctly. This may include an in-person or virtual/remote site inspection or, where not possible, a third party can collect suitable evidence. However, if any measure listed in 9.2 connects to or penetrates another fabric EEM that is being installed or has been installed during the retrofit works, an in-person inspection is required by the Retrofit Coordinator (9.2).

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