What is MCS certification and why does it matter?
MCS (Microgeneration Certification Scheme) certification is the UK quality standard for solar installers and installations. It matters because you need an MCS-certified install to claim the Smart Export Guarantee, and it gives you assurance the system was designed and fitted to recognised standards, with a workmanship warranty and consumer protection.
Why MCS is important
- Required to qualify for the Smart Export Guarantee.
- Confirms the installer is assessed and audited to UK standards.
- Comes with a workmanship warranty and consumer code protection.
- Often expected by insurers and future buyers.
Always use an MCS installer
SunSum only works with MCS-certified installers. When comparing quotes, check each installer's MCS registration and that the certificate will be issued in your name after commissioning, as you will need it for SEG and for selling your home.
Frequently asked questions
- Can I get SEG without MCS?
- No. A valid MCS certificate for your installation is a requirement to sign up for the Smart Export Guarantee.
- How do I check an installer is MCS-certified?
- Ask for their MCS certification number and verify it on the MCS register before signing anything.
Related questions
Indicative estimates based on UK average data. Last updated 27 May 2026.