If you're planning to install solar panels, a heat pump, battery storage, or another renewable energy technology, you'll need an MCS-certified installer. But what does MCS certification actually mean — and how do you verify it?
What Is MCS Certification?
MCS stands for the Microgeneration Certification Scheme. It's an independently managed quality assurance scheme for small-scale renewable and low-carbon energy installations in the UK.
Installers with MCS certification have:
- Demonstrated technical competence in their chosen technology
- Agreed to follow standardised installation practices
- Registered with an approved certification body (such as NICEIC, NAPIT, or RECC)
- Committed to ongoing professional development and audit
Why Does It Matter?
Without an MCS-certified installer, you cannot:
- Claim Smart Export Guarantee (SEG) payments for surplus solar electricity
- Access the Boiler Upgrade Scheme (worth up to £7,500 for heat pumps)
- Qualify for ECO4 free energy improvement schemes
- Meet planning conditions that require certified installation
With an MCS-certified installer, you receive a certificate on completion that you can share with mortgage lenders, insurers, and future buyers.
MCS vs Other Certifications
| Certification | What it covers |
|---|---|
| MCS | Installation quality for solar, heat pumps, wind, etc. |
| NICEIC / NAPIT / ECA | Electrical competence (often held alongside MCS) |
| TrustMark | Government-endorsed trader scheme across trades |
| RECC | Consumer protection code for renewable energy |
| F-Gas | Refrigerant handling (required for heat pump engineers) |
A reputable solar installer typically holds MCS and NICEIC. A reputable heat pump installer holds MCS, F-Gas, and often TrustMark.
How to Verify an MCS Certificate
Check any installer's MCS status at mcscertified.com — search by company name, postcode, or technology. Look for the green Active status; expired certificates are shown differently.
Always verify before signing a contract or paying a deposit.
Red Flags to Watch For
- Reluctance to share their MCS certificate number: Legitimate installers give it freely
- Unusually low quotes: Proper MCS-compliant installations have minimum costs
- No site survey before quoting: MCS requires a survey — a quote without one isn't MCS-compliant
- Pressure to sign quickly: Reputable installers don't use high-pressure tactics
- No mention of DNO notification: Grid-connected systems must be notified to your Distribution Network Operator
The Certificate Number Format
Every MCS-certified installer has a unique reference such as NIC-12345 or MCS-12345. Ask for this number — and verify it.
How Cornwall Green Trades Verifies Listings
Every installer on Cornwall Green Trades is cross-referenced against the MCS public register before being listed. The MCS Verified badge on a listing confirms the business held an active certificate at the time of verification.
Find verified installers near you →
What to Ask When Getting Quotes
Once you've confirmed MCS certification, ask every installer:
- "Can I see your MCS certificate?" — Should be provided immediately
- "Will you handle the DNO application?" — Required for solar and battery storage
- "What warranty do you offer?" — MCS minimum is 5 years; good installers offer 10+
- "Will you help me register for SEG/BUS?" — A good installer includes this as standard
- "Are all engineers on site MCS certified?" — If subcontractors are used, they should be too
Get at least three quotes before committing. Cornwall Green Trades makes it easy to compare local, verified installers.