How to check an installer is MCS certified

Why it matters

MCS (the Microgeneration Certification Scheme) certifies installers and products against installation standards. Ofgem says SEG suppliers will ask you to show your solar installation and installer are suitably certified, which is usually done with an MCS certificate. The Energy Saving Trust also recommends using MCS-certified installers.

How to check, step by step

1. Ask the installer for their exact registered company name and MCS certificate number.
2. Search the MCS Find an Installer tool using that name or your postcode.
3. Make sure the listing is for the same legal company that will invoice you, not just a similar trading name.
4. Check they're certified for the right technology: solar PV and, if you want one, battery storage.
5. After installation, make sure you receive your MCS installation certificate. Keep it safe, because you'll need it for SEG.

Consumer codes (RECC and HIES)

RECC and HIES are consumer codes covering things like sales practices, deposits and complaints. Membership isn't the same thing as MCS, and isn't required for every MCS installer, so check the RECC or HIES members list separately if it matters to you.

Other sensible checks

• A written, itemised quote with system size (kWp), panel and inverter models and the estimated annual generation.
• Who registers the system with the DNO (the local network operator). The installer normally does this.
• Warranties for panels, inverter, battery and workmanship, and whether deposits are protected.
• Whether scaffolding, bird-proofing and any roof repairs are included.
• Avoid pressure selling or “today only” prices.

Related: Grants & SEG · FAQ