MCS vs RECC for commercial solar — which accreditation actually protects you

Two acronyms come up on every solar installer's website: MCS and RECC. They're presented as a matched pair of quality badges, and most buyers nod along without examining what each actually does. For a commercial buyer, that's a mistake — because one of them is essential to you, and the other was built to protect domestic homeowners and may not cover your business at all.

Here's what each one really is, and what it means when you're buying as a company.

MCS — the technical standard (this one matters to you)

The Microgeneration Certification Scheme (MCS) is a technical certification. It covers two things: the products (panels, inverters, batteries) and the installation process. An MCS-certified installer has demonstrated they install to a recognised technical standard, and an MCS certificate is issued for each compliant installation.

For a commercial buyer, MCS matters for one concrete, financial reason beyond quality assurance: it's the gateway to the Smart Export Guarantee. To be paid for the electricity you export to the grid, your installation must be MCS-certified (or the equivalent for larger systems). No MCS certificate, no SEG income. Given export is typically 20–30% of a commercial system's financial benefit, that's not optional.

So: insist on MCS. Ask for the installer's MCS registration number and check it on the MCS website. Confirm your specific installation will be MCS-certified and that you'll receive the certificate. This applies regardless of whether you're a business or a household.

RECC — the consumer code (this one probably doesn't cover your business)

The Renewable Energy Consumer Code (RECC) is a different animal entirely. It's not about technical quality — it's about behaviour. RECC members sign up to a code governing how they treat customers: advertising and sales conduct, quotations, contracts, deposit protection, cancellation rights, complaints handling, and aftercare. It's backed by the Chartered Trading Standards Institute.

That all sounds excellent, and for a homeowner it is. But read the name again: Renewable Energy Consumer Code. Consumer codes exist to protect consumers — individuals buying for purposes outside their trade or business. When you buy solar as a limited company, a partnership, or a sole trader acting in your business, you are generally not a "consumer" in the legal sense, and the consumer protections RECC provides largely don't apply to you.

This is the bit installers don't spell out. An installer's RECC membership is a genuine signal that they run a tidy, consumer-facing operation — but it does not extend the code's deposit protection, cancellation rights, or dispute resolution to your business the way it would to a homeowner. (The same logic applies to HIES, another consumer code you may see.)

So what protects a business buyer?

Your contract. Not a code — the actual written agreement between your company and the installer. Because you can't lean on consumer protections, you need to get the protections you want into the commercial contract explicitly:

• Deposit protection — staged payments tied to milestones (deposit, delivery, commissioning), not a large upfront sum with nothing securing it.
• Performance guarantee — a commitment to a minimum annual generation, with a remedy if it underperforms.
• Workmanship warranty — distinct from the product warranties, covering the installation itself for a defined period.
• Clear timelines — with consequences for slippage.
• What happens on insolvency — what protects your deposit and your warranties if the installer goes under before or after commissioning.

We go through these in detail in our guide to reading a commercial solar quote.

The other marks you'll see

• NICEIC / NAPIT — electrical competence schemes. The electrical work should be signed off by a registered electrician. Relevant and worth confirming.
• TrustMark — a government-endorsed quality mark, again consumer-facing but a reasonable signal.
• HIES — another consumer code, same domestic-consumer caveat as RECC.

None of these replace a solid commercial contract for a business buyer. They're signals, not guarantees of your protection.

How to sanity-check an installer's accreditations

1. MCS — get the registration number, verify it, confirm your install will be certified. This is non-negotiable (it's your SEG eligibility).
2. Electrical — confirm NICEIC or NAPIT registration for the electrical work.
3. RECC/HIES — note it as a positive signal of a well-run business, but don't assume it protects your company. It's built for homeowners.
4. Your contract — this is where your actual protection lives. Make sure the deposit terms, performance guarantee, warranties, and insolvency provisions are written down.

The bottom line

For a commercial buyer: MCS is essential (quality plus SEG eligibility), the consumer codes are reassuring but largely don't extend their protections to your business, and your real safety net is a well-drafted contract. Treat an installer who understands that distinction — and offers business-appropriate contractual terms — as a better bet than one who simply points at a row of logos.

To see the savings case your accredited installer should be able to stand behind, run the calculator. For the contract-level checks, read reading a commercial solar quote. And for a monthly read on standards and the wider market, subscribe to the Brief.

General information, not legal advice. Confirm contractual and consumer-law positions with your solicitor.