TrustMark, in collaboration with their Scheme Providers, have published an updated PAS2035:2023 Retrofit Design Guidance to assist in the preparation of retrofit designs and supporting documentation. This guidance aims to help professionals comply with the requirements of PAS2035:2023. 

The guide is organised into clear, accessible sections covering all aspects of retrofit design. Each section references specific paragraphs of PAS2035:2023 and includes notes on evidence requirements where applicable. 

There are 15 revisions listed in PAS20235:2023, not all of which directly impact on compliant retrofit design compliance. Some key ones to note include: 

• PAS 2035 guidance clauses have been updated.
• The risk assessment process has been simplified.
• There is a change of emphasis from measures-based retrofit to whole dwelling retrofit.
• There is some clarification of the role of the Retrofit Coordinator, including site visits and recording of non-compliance.
• Clarification is provided of what happens if historic significance is identified.
• Retrospective compliance for distressed replacement of heating appliances has a defined process. 

The document ends with providing a straightforward Retrofit Design Checklist to help ensure the design is compliant with PAS2035:2023 

Download the Retrofit Design Guidance HERE 

PAS 2035/2030:2023 provides guidelines for retrofitting dwellings to improve energy efficiency. It must be used for work funded under government energy efficiency schemes such as: