The installer is the business that actually carries out the work on your home
— fitting insulation, a heat pump, solar panels or a new heating system.
Whether you are paying privately or receiving help through a
government grant, the credentials the installer holds
are the clearest sign of whether the job will be done to a recognised standard
and be put right if something goes wrong. This page explains what to look for.
The accreditation that matters
For energy-efficiency measures installed under government schemes, an installer generally needs to be:
- TrustMark-registered – TrustMark is the government-endorsed quality scheme for work carried out in and around the home, and registration is a condition of most funded work.
- Certified to PAS 2030 – the British standard covering how energy-efficiency measures are installed under schemes such as ECO.
- MCS-certified for low-carbon technology – the Microgeneration Certification Scheme covers products and installations like heat pumps, solar PV and biomass. For most renewable-heat grants, MCS certification is required.
Why it matters to you
These schemes exist to protect you. Registration brings agreed workmanship
standards, a complaints route and financial protection if a business ceases
trading, and it is a condition of the funding administered by Ofgem under ECO.
An installer who cannot show current TrustMark, PAS 2030 or MCS credentials
should not be carrying out grant-funded measures.
Always confirm these details before signing anything — you can check
them on the public registers rather than taking a firm’s word for it.
For more on choosing renewable measures and the funding behind them, see our
renewable energy grants guidance and
the wider energy and water section.