How to Choose an MCS-Certified Solar Installer (and Why It Matters)

MCS certification isn't just a nice-to-have for your solar installer - it's essential. Without it, you can't claim the Smart Export Guarantee, your installation may not comply with building regulations, and your warranty could be worthless. But the MCS logo alone doesn't guarantee a great experience.

What MCS certification means

The Microgeneration Certification Scheme ensures that installers meet minimum standards for:

• Technical competence and training
• Quality of workmanship


• Consumer protection (insurance, warranties, complaints handling)


• Ongoing assessment and re-certification

There are currently about 3,500 MCS-certified solar installers in the UK. Quality varies.

What to check beyond the certificate

Track record. How many installations have they done? A company that's installed 500+ systems is less likely to make rookie mistakes than one that's done 20. Ask for recent references and check reviews.

Warranty terms. MCS requires a minimum workmanship warranty, but some installers offer significantly more. Look for:

• 10-year workmanship warranty (minimum)
• 25-year panel performance warranty (standard from good manufacturers)


• 10-15 year inverter warranty

The survey. A good installer will do a thorough site survey before quoting. Be wary of anyone who quotes without visiting or at least requesting detailed roof photos and an electricity bill.

The quote. It should be detailed: specific panel model and number, inverter type, mounting system, estimated generation, projected savings with clear assumptions, and total cost including scaffolding and VAT.

Red flags

• Pressure to sign today with "limited time" discounts
• Quoting without surveying your property


• Unable to provide MCS certificate number


• Unusually low prices (often means cheaper panels or corner-cutting on installation)


• No mention of DNO notification or grid connection


• Requesting large upfront deposits (more than 25%)

The price question

Good installers aren't always the cheapest, but they shouldn't be the most expensive either. The sweet spot is usually mid-range. Extremely cheap quotes often mean inferior equipment or inexperienced installation teams.

For a 4kW system in 2026, you should expect to pay £5,500-7,500 from a reputable installer. If someone quotes £3,500, ask what corners they're cutting. If someone quotes £12,000, they'd better have an excellent reason.

The easiest way to compare

Request quotes through our platform and you'll receive up to three quotes from vetted, MCS-certified installers. All have been checked for certification, insurance, and track record. It's free, takes two minutes, and gives you a clear basis for comparison.

After installation

Keep your MCS certificate safe. You'll need it to:

• Apply for Smart Export Guarantee payments
• Prove compliance if you sell your home


• Make warranty claims if needed

A good installer will also handle your DNO notification and provide commissioning documentation. If they don't offer this, ask. It's required.