Retrofit coordination, from first survey to TrustMark lodgement

Reviewed October 2026

What a Retrofit Coordinator does

The coordinator is the one role that stays with a retrofit project from beginning to end. Assessors survey, designers specify and installers fit. The coordinator makes sure those pieces add up to a home that performs as intended, and takes responsibility for showing that they do.

• Reviews the assessment and identifies risks before any measure is chosen.
• Produces the medium-term improvement plan for the home, which PAS 2035:2023 requires for every dwelling.
• Manages the design stage, working with a qualified Retrofit Designer so that insulation, ventilation and heating are specified to work together.
• Checks the installation. The standard requires evidence that each measure has been fitted correctly, kept as a written record with photographs.
• Inspects in person wherever one measure connects to or passes through another. That is mandatory.
• Hands over and lodges the completed project with TrustMark.

PAS 2035 in plain terms

PAS 2035 is the over-arching standard for the energy retrofit of homes in the UK. It was created after the Each Home Counts review, which the government commissioned in 2015 to tackle the high failure rate in domestic retrofit. Its central idea is that a house is one system: change the insulation and you change how moisture, air and heat behave everywhere else.

The current edition, PAS 2035:2023, has been mandatory for new projects since 31 March 2025. Among other changes it requires an improvement plan for every property, tightens the rules on who may act as designer, and sets out exactly what evidence a coordinator must gather during installation.

Compliance is required on publicly funded domestic retrofit. Installers must be certified to PAS 2030, and everyone involved must be registered with TrustMark.

Who we work with

• Installers who need an independent coordinator on their projects, with clear communication and a well-prepared evidence file.
• Housing associations and local authorities delivering programmes under the Warm Homes: Social Housing Fund and the Warm Homes: Local Grant.
• Landlords planning the work needed to reach band C by 2030, who want it done once and in the right order.
• Homeowners making a significant investment who want someone on their side of the table.

What you get from us

• An improvement plan built on a proper assessment, not a desktop guess
• Ventilation considered alongside every fabric measure
• Site inspections and a photographic record of the installation
• Issues raised while they can still be fixed, not after handover
• A complete evidence file, lodged with TrustMark

We do not install measures. That independence is the point of the role.

The funding picture in 2026

Retrofit funding is in transition. The Warm Homes Plan, published in January 2026, commits £15 billion of public funding over five years, with the aim of upgrading up to 5 million homes.

• Warm Homes: Local Grant. £500 million through English local authorities, for low-income households in poorly performing homes.
• Warm Homes: Social Housing Fund. £1.29 billion awarded to social housing providers to improve homes below band C.
• Boiler Upgrade Scheme. The £7,500 grant towards a heat pump continues.
• ECO4. Extended to 31 December 2026 to allow an orderly close. The Great British Insulation Scheme was not extended.

Scheme rules change often. Tell us what you are delivering and we will tell you what the standard requires of it.

Sources: Elmhurst Energy guidance on PAS 2035 and its summary of the 2023 edition (July 2025); TrustMark; GOV.UK Warm Homes Plan (21 January 2026), as summarised by Elmhurst Energy and Energy Trust. This page is general guidance.