MCS certified solar installers: what it means and how to check

MCS is the UK’s quality mark for small-scale renewables such as solar panels. An MCS certified installer follows published standards, and the certificate is what lets you claim Smart Export Guarantee payments for spare power. You can check any installer on the MCS website, so do that before you pay a deposit, because the check is free.

What MCS certification means

MCS stands for the Microgeneration Certification Scheme. The MCS installer search calls it the UK’s quality mark for small-scale renewables like solar panels and heat pumps.

Certification applies to two things, as a result. The business must meet the scheme’s rules, and each system it fits must follow the technical standard. For solar panels, that standard is MIS 3002. The current version is Issue 6.0, dated 18 March 2026, and you can read it in the MIS 3002 standard.

Because of this, the certificate is not a general badge. It links to a named installer and a named job.

Why it matters for Smart Export payments

The Smart Export Guarantee pays you for power you send back to the grid. However, GOV.UK is clear on who can claim. You must prove that MCS, or an equivalent accredited scheme, certifies both your installation and your installer. You can read the rule on the GOV.UK SEG page.

Therefore, hiring a non-certified installer can cost you income for years. Our guide to the Smart Export Guarantee explains how tariffs work and how to compare them.

What an MCS installer must do

The standard sets out real duties. For example, the installer must make sure a competent person checks that your roof structure can take the loads from the system. That is a clause in MIS 3002.

Since 18 June 2026, installers must also show evidence for the mounting system. Where no certified mounting system exists, that means structural and wind loading calculations for the system they fit. MCS explains this in its update to MIS 3002.

The installer must also tell your network operator about the system. Although the route depends on size, the duty stays the same. Our guide to G98 and G99 grid connection covers the detail, so you know what to expect. Your installer does the paperwork, but you should know that it happens.

How to check an installer

Follow these steps before you sign, because each closes a gap.

1. Search for the business on the MCS site and confirm it is listed.
2. Ask for the MCS certificate number and check it matches.
3. Ask which consumer code they follow, and check that too.
4. Get the quote in writing, with the system size, panel model and mounting method.
5. Ask who will do the roof structure check.

Do not rely on a logo on a van or a website. Logos are easy to copy, whereas the register is not. Therefore, always check the source.

Also be wary of anyone who says certification is optional or too slow. In contrast, a good installer will explain the steps without fuss. Our red flags guide lists other warning signs.

MCS and consumer protection

MCS covers the quality of the work. However, it does not, on its own, protect your deposit. That is where a consumer code helps.

RECC is the Renewable Energy Consumer Code. Its members must insure deposits and stage payments, and the workmanship warranties they issue. As a result, you have cover if the installer ceases to trade. RECC sets this out on its deposit and warranty protection page.

So ask both questions. Is the installer MCS certified, and does it sign up to a consumer code? A yes to both is a good start, although you should still compare more than one quote.

Batteries and other add-ons

If you want a battery, check the installer’s scope, because battery work has its own rules. MCS has a separate standard for batteries, called MIS 3012. It covers installers who supply, design and install storage systems up to 50kW. The standard came in during November 2021, so any good battery installer should know it well.

Because a battery changes how your system connects, ask for the battery work in writing too. Our guide on whether solar batteries are worth it looks at costs and benefits.

Planning and the rest of the job

Certification does not replace planning checks, since it is a separate process. Many home installs need no application, but rules differ by nation, and England changed in August 2026. See our guide to planning permission for solar panels for the main cases. Your installer should flag a listed building or conservation area early.

Local conditions affect output too. For example, compare how solar performs in Leicester, what to expect in York and solar in Newcastle upon Tyne. Our output table for 24 UK cities puts them side by side.

Where to go next

Start with a clear picture of the work, because it makes quotes easier to compare. Read about solar panel installation so you know what a full job involves.

Still, when you want quotes, you can request quotes from MCS certified installers. We are an independent guide, not an installer, and we contact no one without your consent.

The short version

• MCS is the UK quality mark for small solar systems.
• You need an MCS certified installer to claim Smart Export payments.
• Check the register yourself, and ask for the certificate number.
• Ask about a consumer code such as RECC to protect your deposit.