In response to TrustMark’s consultation on proposed scheme changes, Energy Systems Catapult said the changes should be judged by whether homes end up warmer, healthier and cheaper to run.

We call on TrustMark to build its new scheme around measured outcomes, fit it within the government’s consumer protection framework from 2028, and keep it proportionate so that smaller businesses and innovators can help the market grow.

Our key points are:

– Focus on outcomes: home upgrades should deliver improved comfort, affordability, health and energy performance. Assurance should test whether those outcomes are achieved, not rely mainly on process, certification and photographs.

– One coherent framework: TrustMark is one part of a wider system that includes the Microgeneration Certification Scheme (MCS), certification bodies, self-certification schemes and the Department for Energy Security and Net Zero’s proposed consumer protection service from 2028. Changes to TrustMark should fit that framework and avoid duplication.

– Proportionate and innovation-friendly: rules should define the outcomes and evidence required, while staying open to new technologies, business models and ways of demonstrating performance. Duplicated or disproportionate requirements risk excluding smaller businesses and innovators, just as the market needs to grow.

– Consumers at the centre: households need one clear route to redress, with several trusted ways in, and support designed around those who are most vulnerable.