{"id":275312,"date":"2025-01-23T09:00:37","date_gmt":"2025-01-23T09:00:37","guid":{"rendered":"https:\/\/detail-library.co.uk\/?p=275312"},"modified":"2025-02-06T12:47:44","modified_gmt":"2025-02-06T12:47:44","slug":"the-evolution-of-pas-2035","status":"publish","type":"post","link":"https:\/\/detail-library.co.uk\/the-evolution-of-pas-2035\/","title":{"rendered":"The Evolution of PAS 2035"},"content":{"rendered":"

[et_pb_section fb_built=”1″ specialty=”on” padding_top_1=”80px” padding_top_bottom_link_1=”false” padding_left_right_link_1=”false” admin_label=”Intro” _builder_version=”4.22.2″ custom_padding=”3px|||||” global_colors_info=”{}”][et_pb_column type=”2_3″ specialty_columns=”2″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_row_inner _builder_version=”4.16″ global_colors_info=”{}”][et_pb_column_inner saved_specialty_column_type=”2_3″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_post_title meta=”off” featured_image=”off” _builder_version=”4.16″ title_font=”Montserrat|600|||||||” title_text_color=”#000000″ title_font_size=”64px” title_line_height=”1.2em” title_font_size_tablet=”50px” title_font_size_phone=”24px” title_font_size_last_edited=”on|desktop” locked=”off” global_colors_info=”{}”][\/et_pb_post_title][\/et_pb_column_inner][\/et_pb_row_inner][et_pb_row_inner _builder_version=”4.16″ global_colors_info=”{}”][et_pb_column_inner saved_specialty_column_type=”2_3″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_text admin_label=”Intro Text” _builder_version=”4.27.4″ text_line_height=”1.8em” max_width=”600px” module_alignment=”center” locked=”off” global_colors_info=”{}”]<\/p>\n

The next iteration of the UK government\u2019s retrofit standard comes into force at the end of March 2025. There are plenty of changes to be aware of, and it impacts all the key roles like Retrofit Assessor, Retrofit Coordinator and Retrofit Designer. Technical guidance has been updated, airtightness strategies are now included, and some compliance documents have become mandatory for all projects.<\/span><\/p>\n

Due to a change in the qualification requirements, some Retrofit Coordinators may not be able to undertake the responsibilities they have been doing previously. The role of qualified, professional designers becomes more important, as do mandatory site visits for some installations. This takes some retrofit roles from merely desk-based compliance positions to those that require greater construction experience and how to deal with installers.\u00a0\u00a0<\/span><\/p>\n

[\/et_pb_text][\/et_pb_column_inner][\/et_pb_row_inner][\/et_pb_column][et_pb_column type=”1_3″ _builder_version=”4.16″ custom_padding=”|||” global_colors_info=”{}” custom_padding__hover=”|||”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2025\/01\/06-Pathways-to-roles-scaled.jpg” alt=”06 Pathways to roles” title_text=”06 Pathways to roles” admin_label=”Image 06″ _builder_version=”4.27.4″ custom_margin=”|-9vw|||false|false” global_colors_info=”{}”][\/et_pb_image][\/et_pb_column][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Quote Section” _builder_version=”4.21.0″ use_background_color_gradient=”on” background_color_gradient_direction=”90deg” background_color_gradient_stops=”#ffffff 70%|#00c4cc 70%” background_color_gradient_start=”#ffffff” background_color_gradient_start_position=”70%” background_color_gradient_end=”#00c4cc” background_color_gradient_end_position=”0%” custom_padding=”50px||3px||false|false” background_last_edited=”on|phone” background_color_gradient_stops_phone=”#ffffff 95%|#00c4cc 95%” background_color_gradient_start_position_phone=”95%” locked=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.16″ max_width=”900px” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.16″ global_colors_info=”{}”][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2021\/03\/magazine-18.png” _builder_version=”4.16″ custom_margin=”||50px||false|false” global_colors_info=”{}”][\/et_pb_image][et_pb_text _builder_version=”4.27.4″ text_font=”Cardo||||||||” text_text_color=”#2a2a2a” text_font_size=”42px” text_line_height=”1.4em” text_orientation=”right” text_font_size_tablet=”36px” text_font_size_phone=”24px” text_font_size_last_edited=”on|desktop” global_colors_info=”{}”]<\/p>\n

Due to a change in the PAS2035 qualification requirements, some Retrofit Coordinators may not be able to undertake the responsibilities they have been doing previously.<\/span><\/p>\n

[\/et_pb_text][et_pb_divider divider_weight=”6px” _builder_version=”4.16″ _module_preset=”default” global_colors_info=”{}”][\/et_pb_divider][\/et_pb_column][\/et_pb_row][\/et_pb_section][et_pb_section fb_built=”1″ admin_label=”Blog Post Body” _builder_version=”4.22.2″ collapsed=”off” global_colors_info=”{}”][et_pb_row _builder_version=”4.22.2″ _module_preset=”default” custom_padding=”100px||||false|false” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.19.5″ _module_preset=”default” global_colors_info=”{}”][et_pb_text admin_label=”Intro Continued” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”20px||||false|false” global_colors_info=”{}”]<\/p>\n

We see this as an opportunity to bring Architects and Technologists into the emerging retrofit market. The complexity of these projects demands expertise and the uptake of architects becoming Retrofit Coordinators has been slow. The scale of the opportunity is huge, including a newly announced \u00a36.6 billion spend over 5 years for 5 million homes as part of the new Warm Homes Plan.\u00a0<\/span><\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” column_structure=”1_5,3_5,1_5″][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”3_5″][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2025\/01\/01-PAS-2035.jpg” alt=”01 PAS 2035″ title_text=”01 PAS 2035″ align=”center” admin_label=”Image 01″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” custom_padding=”30px||||false|false” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.25.1″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.25.1″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.0″ _module_preset=”default” max_width=”70%” module_alignment=”left” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”What is PAS 2035? (H2)” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”20px||||false|false” global_colors_info=”{}”]<\/p>\n

What is PAS 2035?<\/h2>\n

[\/et_pb_text][et_pb_text admin_label=”What is PAS 2035?” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”20px||||false|false” global_colors_info=”{}”]<\/p>\n

PAS 2035 <\/span>Retrofitting dwellings for improved energy efficiency \u2013 Specification and guidance <\/span><\/i>is the government\u2019s retrofit standard. PAS stands for publicly available specification. It does not carry the same weight as a full British Standard. 2035 is simply the number \u2013 which can be seen as slightly misleading as it implies it has something to do with the year 2035, which it doesn\u2019t.\u00a0<\/span><\/p>\n

The first iteration was PAS 2035:2019 but is due to be replaced shortly by PAS 2035:2023. As the name suggests, this was published in September 2023 with a transition period before it takes force on 30<\/span>th<\/span> March 2025.\u00a0<\/span><\/p>\n

The latest version had Dr Sarah Price as technical author supported by a steering group that included accreditation bodies like Trustmark & Elmhurst, government departments, professional consultants, housing groups, guarantee agencies and representatives of key players in the retrofit market.\u00a0\u00a0<\/span><\/p>\n

The process outlined in this document is mandatory for all government funded retrofit schemes e.g. the Social Housing Decarbonisation Fund (SHDF), the Great British Insulation Scheme (GBIS) or ECO4 which is an energy company obligation to help improve UK dwellings.\u00a0<\/span><\/p>\n

For those working with private individuals in the \u2018able-to-pay\u2019 market, PAS 2035 is not mandatory. Still, many practitioners choose to use it wholly or in part as it preaches best practice and is hard to fault in its intentions to manage what is a complex process with many stakeholders. So, what does it do?<\/span><\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” column_structure=”1_5,3_5,1_5″][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”3_5″][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2025\/01\/02-Each-home-counts.jpg” alt=”02 Each home counts” title_text=”02 Each home counts” align=”center” admin_label=”Image 02″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” custom_padding=”30px||||false|false” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default”][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”4_4″][et_pb_text admin_label=”Each Home Counts Review (H2)” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”80px||||false|false” global_colors_info=”{}”]<\/p>\n

Each Home Counts Review<\/h2>\n

[\/et_pb_text][et_pb_text admin_label=”Each Home Counts Review” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”30px||||false|false” global_colors_info=”{}”]<\/p>\n

PAS 2035 was one of the outcomes from the 2016 Each Home Counts report, an independent review chaired by Peter Bonfield. Its purpose was to review the results of some poorly performing retrofit installations and recommend actions. These broadly covered restoring consumer trust & protection, the production of standards, and better monitoring and auditing of the retrofit process. The review highlighted the problem of unintended consequences and the lack of professional roles to support the customer on their journey with expert and independent advice. Too often the advice came from the same installer\/ contractor with a vested interest.<\/span><\/p>\n

The resulting PAS 2035 was published by the British Standards Institute (BSI) in June 2019. It is not a manual for how to retrofit a house, but a process, focussing on risk management involving the right professionals at the right time. It advocates for a Whole House Approach with a bias towards Fabric First measures. The key role of the Retrofit Coordinator is designed to be independent of any installers, so a customer gets impartial technical advice without that individual having an agenda to push any products.<\/span><\/p>\n

Alongside this, Trustmark was established as a quality mark. This is a UK government quality assurance scheme that all retrofit professionals are accredited with (sometimes through a \u2018Scheme Provider\u2019 like a training organisation). Projects are also submitted to Trustmark\u2019s Data Warehouse where they are audited for compliance and to check the qualifications and experience of the project team. Consumers are directed to Trustmark to find trades and professionals who are deemed to meet the required standard.<\/span><\/p>\n

In summary, as the outcome of the Each Home Counts review, PAS 2035 is the whole house retrofit process that supports the customer from inception to completion, utilising the best industry advice with accountable and independent roles backed by recognised qualifications.<\/span><\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” column_structure=”1_5,3_5,1_5″][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”3_5″][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2025\/01\/03-Retrofit-Assessor.jpg” alt=”03 Retrofit Assessor” title_text=”03 Retrofit Assessor” align=”center” admin_label=”Image 03″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” custom_padding=”30px||||false|false” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.22.2″ _module_preset=”default” max_width=”70%” module_alignment=”right” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”PAS 2035 Roles (H2)” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”80px||||false|false” global_colors_info=”{}”]<\/p>\n

PAS 2035 Roles<\/h2>\n

[\/et_pb_text][et_pb_text admin_label=”PAS 2035 Roles” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n

The roles of Retrofit Assessor (RA), Retrofit Coordinator (RC), Retrofit Evaluator & Retrofit Designer (RD) were created by PAS 2035. For any existing construction professional looking to engage with the process, it is important to understand what your qualifications allow you to do, and which roles require further training.\u00a0<\/span><\/p>\n

Even chartered architects, surveyors and M&E engineers may still need to complete accredited retrofit or conservation training courses to satisfy all requirements of PAS 2035. Qualifications are checked during regular project audits, so there are no shortcuts. Crucially, these have changed between the 2019 and 2023 versions, which are explored in depth below.\u00a0<\/span><\/p>\n

[\/et_pb_text][et_pb_text admin_label=”Installation using PAS 2030 (H2)” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”80px||||false|false” global_colors_info=”{}”]<\/p>\n

Installation using PAS 2030<\/h2>\n

[\/et_pb_text][et_pb_text admin_label=”Installation using PAS 2030″ _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n

When the retrofit process reaches the construction stage (or Installation) then a different standard takes prominence. PAS 2030 <\/span>Installation of energy efficiency measures in existing dwellings \u2013 Specification, <\/span><\/i>covers the installation of energy efficiency measures (EEMs) like insulation, upgraded heating systems and renewables. It was first published in February 2012 and has been updated alongside the two issues of PAS 2035, such is their symbiosis. PAS 2030:2023 also comes into force on 30<\/span>th<\/span> March 2025 and supersedes any previous version.<\/span><\/p>\n

Whereas the PAS 2035 process is audited by Trustmark and their external partners, PAS 2030 installations are audited separately, with their own training courses and certification to guarantee the organisations and individual tradesperson working on the project. Again, consumers are encouraged towards those who carry the PAS 2030 badge via Trustmark.<\/span><\/p>\n

Individuals are required to sign off their work as part of a Claim of Compliance document. This is submitted to the RC as one of the key project documents, ensuring personal responsibility and transparency to the customer. The RC then submits this to Trustmark as part of the whole project submission, including the assessments and surveys from the RA, designs from the RD and the other documents that the RC is responsible for producing. <\/span><\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” column_structure=”1_5,3_5,1_5″][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”3_5″][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2025\/01\/04-Retrofit-Assessment-PAS-2035.jpg” alt=”04 Retrofit Assessment PAS 2035″ title_text=”04 Retrofit Assessment PAS 2035″ align=”center” admin_label=”Image 04″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” custom_padding=”||||false|false” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.27.4″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.4″ _module_preset=”default” max_width=”70%” module_alignment=”left” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”Risk Paths (H2)” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”80px||||false|false” global_colors_info=”{}”]<\/p>\n

Risk Paths<\/h2>\n

[\/et_pb_text][et_pb_text admin_label=”Risk Paths” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n

One of the key aspects of PAS 2025:2019 was the risk assessment process that triaged projects into one of three paths A, B or C. Five criteria were used to assess the project and the overall risk path was assigned. These covered the number of properties being assessed, the number of EEMs being installed, construction type etc.\u00a0<\/span><\/p>\n

Path A was designated to the lowest risk where maybe only one measure was being proposed e.g. roof mounted solar panels that have no interactions with other parts of the house. Path B was the typical path used with Path C reserved for the highest risk covering lots of measures interacting combined perhaps with traditional construction with solid walls, or projects with heritage considerations.\u00a0<\/span><\/p>\n

The path determined which documents were needed, which qualifications were required by project personnel plus maybe extra roles. For example, Path C required a pre and post air test with certification. The path designation had an impact on the time, complexity and cost of the process for the client.<\/span><\/p>\n

However, this is being simplified. All projects now follow a \u2018main process\u2019 more akin to the old Path B. Path A no longer exists so the simplest projects now require more documentation (like a mandatory Medium Term Plan). The project risk is now defined by building type, so additional steps may be needed for projects that are of traditional construction (e.g. pre cavity walls, solid stone) or protected, that are high rise or a system build. It is important this designation is defined early in the process so the project can be mapped out and the correct stages followed.<\/span><\/p>\n

[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.27.4″ _module_preset=”default” column_structure=”1_5,3_5,1_5″][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”3_5″][et_pb_image src=”https:\/\/detail-library.co.uk\/wp-content\/uploads\/2025\/01\/05-Measures-Interaction-Matrix.png” alt=”05 Measures Interaction Matrix” title_text=”05 Measures Interaction Matrix” align=”center” admin_label=”Image 05″ _builder_version=”4.27.4″ _module_preset=”default” width=”100%” custom_padding=”||||false|false” hover_enabled=”0″ global_colors_info=”{}” sticky_enabled=”0″][\/et_pb_image][\/et_pb_column][et_pb_column _builder_version=”4.27.4″ _module_preset=”default” type=”1_5″][\/et_pb_column][\/et_pb_row][et_pb_row _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_column type=”4_4″ _builder_version=”4.24.2″ _module_preset=”default” global_colors_info=”{}”][et_pb_divider divider_weight=”6px” _builder_version=”4.27.4″ _module_preset=”default” max_width=”70%” module_alignment=”right” custom_padding=”10px||||false|false” global_colors_info=”{}”][\/et_pb_divider][et_pb_text admin_label=”2025 Changes (H2)” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”80px||||false|false” global_colors_info=”{}”]<\/p>\n

2025 Changes<\/h2>\n

[\/et_pb_text][et_pb_text admin_label=”2025 Changes ” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”||||false|false” global_colors_info=”{}”]<\/p>\n

The changes imposed by PAS 2035:2023 are numerous, so we\u2019d recommend reading the new standard if full and following the guidance from your accreditation body if you are already practising in this field. For new projects, start using the new standard as soon as possible to avoid any submissions missing the deadline.\u00a0<\/span><\/p>\n

We have picked out some of the key changes below that will affect the process and the project roles undertaken by designers who also specialise as RAs, RCs or RDs.<\/span> <\/p>\n

[\/et_pb_text][et_pb_text admin_label=”Changes to the Roles” _builder_version=”4.27.4″ _module_preset=”default” custom_padding=”50px||||false|false” global_colors_info=”{}”]<\/p>\n

Changes to the Roles<\/h3>\n

 <\/p>\n

Retrofit Assessor<\/b><\/p>\n