Certification bodies are the organisations that check installers and assessors against the standards, then certify them to work. They sit between the people doing work on your home and the schemes that require it to be done properly — and because you rarely deal with them directly, it helps to understand what they are for. This page explains their role in keeping grant-funded energy work trustworthy.
What certification bodies do
A certification body assesses a business, confirms it meets the relevant standard, and then monitors it over time. In the home energy-efficiency world they typically:
- Certify installers to PAS 2030 for how energy-efficiency measures are installed under schemes such as ECO.
- Certify low-carbon installations under the Microgeneration Certification Scheme (MCS) — heat pumps, solar PV, biomass and similar.
- Accredit assessors and coordinators operating under PAS 2035, the domestic retrofit standard.
- Carry out ongoing checks – audits and inspections so that certification reflects current, not past, competence.
How it fits together
These bodies work within wider frameworks. TrustMark is the government-endorsed quality scheme that installers register with, and MCS is the recognised mark for small-scale renewable technology. A certification body is what makes those marks meaningful, because it verifies each business rather than letting firms simply claim compliance.
For you, the practical point is that a genuine credential can be traced back to a recognised body and confirmed on a public register. If a trader names a certification but it cannot be verified, treat that as a reason to pause. To see how the individual roles connect, read our pages on accredited installers and retrofit assessors, and for the funding context see our renewable energy grants guidance and the energy and water section.