How do I check if an installer is MCS-certified?

Visit mcscertified.com, click 'Find an Installer', and search by company name or postcode. It is free and instant. If the company does not appear, they are not MCS-certified.

Can I install solar without MCS?

Yes, but SEG requires MCS or an equivalent accredited scheme, and most government schemes specify MCS, so you would be narrowing your options considerably.

What if my installer loses MCS certification?

Your existing installation certificate remains valid — it was certified at the time of installation. Future warranty claims may be complicated if the installer is no longer certified. Choose established, financially stable MCS companies.

Is MCS the same across the UK?

Yes — MCS is a UK-wide scheme covering England, Scotland, Wales, and Northern Ireland. The same standards apply everywhere. Scottish Building Standards differ from Part P but MCS compliance handles this.

Home Solar Guide

MCS Installer Register: How to Check

By Home Solar Guide Team|Updated 18 March 2026|guide

Independently written | Evidence-based | Sources cited

MCS-certified installer — verify at mcscertified.com — Always verify MCS certification before signing — it takes 30 seconds at mcscertified.com.

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How do I check if a solar installer is MCS-certified?

The MCS Installer Register at mcscertified.com is the official UK database of certified solar installers. Search by company name, postcode, or certificate number — free and instant. Every solar installer you consider MUST be on this register. Without recognised certification - MCS or an accredited equivalent - you cannot claim SEG payments, and most government schemes specify MCS. Verify before signing any contract.

How to Check the Register

Three ways to verify:

Visit mcscertified.com → 'Find an Installer' → search by company name
Search by your postcode to find all MCS-certified installers near you
Enter the installer's MCS certificate number (they should provide this on request)

What the register shows: - Company name and address - MCS certificate number and status (active/suspended/withdrawn) - Technologies certified for (Solar PV, heat pumps, etc.) - Date of certification

If an installer is NOT on the register: Do not use them. Either they are not certified (bad) or their certification has been suspended/withdrawn (worse). Ask them to explain — if they cannot provide a valid certificate number, walk away.

Source: mcscertified.com.

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All legitimate UK installations are MCS-certified — Every one of the UK's 1.3 million solar installations was done by an MCS-certified installer.

Why MCS Matters

SEG requires MCS or an equivalent accredited scheme - without recognised certification you cannot claim export payments
No ECO4/BUS grant eligibility without MCS
No guarantee of safe, competent installation
No Part P self-certification (you need separate building control)
No quality assurance or complaints procedure
Property sale complications — buyers want MCS documentation