How to Choose a Solar Panel Installer: The MCS Checklist
The installer matters as much as the panels. Here’s how to pick a good one — the checks that matter, the questions to ask, and the red flags to walk away from.
The short answer
Choosing a good solar installer comes down to a few key checks. The single most important is MCS certification — it proves quality and is required to get paid for exported electricity (the Smart Export Guarantee). Beyond that: look for RECC or HIES consumer-protection membership, genuine reviews and a track record, clear itemised quotes, proper warranties, and an installer who surveys your roof and never pressures you.
Get at least three quotes to compare fairly, ask the right questions, and walk away from anyone using high-pressure sales or “today only” discounts. Do that, and you’ll get a quality installation at a fair price. Here’s the full checklist — and the red flags to avoid.
What this guide covers
Here’s something the glossy solar ads don’t tell you: the quality of your installer matters as much as the quality of your panels. A great system fitted badly will underperform and cause headaches; a sensible system fitted well by a good installer will quietly pay you back for decades. So choosing the right installer is arguably the most important decision you’ll make. Here’s how to do it with confidence.
Why MCS certification is non-negotiable
The one check you must not skip
MCS (Microgeneration Certification Scheme) certification is the single most important thing to look for, and it matters for two big reasons. First, it proves the installer meets recognised standards of competence and product quality — real assurance the job will be done properly. Second, and crucially for your wallet: your installation must be MCS-certified for you to qualify for the Smart Export Guarantee (SEG) — the scheme that pays you for the surplus electricity you export to the grid. Without MCS, you can’t claim those export payments, which undermines much of the financial case for going solar. So MCS isn’t just a quality badge — it’s essential to the economics of your system. If an installer isn’t MCS-certified, that’s not a “maybe” — it’s a walk-away. Every installer we introduce you to is MCS-certified precisely because it’s this important.
The solar installer checklist
Beyond MCS, here’s what a good installer should have:
| Check | Why it matters |
|---|---|
| MCS certification | Quality standard + required for SEG payments |
| RECC or HIES membership | Consumer protection & dispute resolution |
| Genuine reviews & track record | Evidence of real, satisfied customers |
| Clear itemised quote | See exactly what you’re paying for |
| Proper warranties | Panels, inverter, battery & workmanship |
| Insurance & guarantees | Protection if something goes wrong |
| In-person / proper survey | Accurate design, not a guess |
RECC (Renewable Energy Consumer Code) and HIES are consumer-protection schemes that give you recourse if things go wrong — a reputable installer will belong to one. Combined with genuine reviews, itemised quotes and a proper roof survey (not a price plucked from thin air), these are the marks of a trustworthy company. If several boxes are missing, keep looking.
Questions to ask a solar installer
A good installer welcomes questions. Ask these, and judge them by how openly they answer:
- Are you MCS certified? (Non-negotiable.)
- Are you a member of RECC or HIES?
- What warranties cover the panels, inverter, battery and your workmanship — and for how long?
- What’s your realistic generation estimate for my roof, and how did you calculate it?
- Is the quote fully itemised — does it include scaffolding, the inverter and any extras?
- What happens if something goes wrong after installation?
- Can you provide references or recent local examples?
Open, confident answers are a good sign. Vagueness, evasion or irritation at reasonable questions is a warning worth heeding.
Red flags to walk away from
✓ Good signs
- MCS-certified & RECC/HIES member
- Gives you time & space to decide
- Itemised, transparent quotes
- Realistic, honest generation estimates
- Proper roof survey before quoting
- Happy to provide references
✗ Red flags
- High-pressure or “today only” discounts
- No MCS certification
- Won’t itemise the quote or give references
- Unrealistic savings/generation promises
- Large upfront deposits
- Quote without surveying your roof
- Cold-calling / door-to-door
The biggest one to internalise: pressure is the enemy of a good decision. Any installer pushing you to sign today for a “special price” is using a tactic, not doing you a favour — a genuine quote is still there tomorrow. The less reputable end of the market relies on urgency and cold-calling. If you feel rushed or pressured, that alone is reason enough to walk away.
Comparing quotes fairly
Get at least three quotes from different MCS-certified installers — it’s one of the simplest, most effective things you can do. Three quotes let you:
- See the fair market price and spot outliers (suspiciously cheap or overpriced).
- Compare the proposed system — panel and inverter brands, battery size, warranties.
- Judge the service and honesty of each company.
Just make sure you’re comparing like with like — a cheaper quote for a smaller system or lesser components isn’t really cheaper. Suspiciously low prices often mean corners cut somewhere; the goal is best value, not lowest price. Getting three comparable quotes is the surest route to a good install at a fair cost — and it’s exactly what a free quote request sets up for you.
Local vs national installers
Both can be excellent — what matters is the certifications, reputation and quote, not size alone. Local installers often bring more personal service, local knowledge and easier aftercare, and can be keenly priced. National companies may offer broader guarantees and more resources, sometimes at a higher price or with less personal contact. Judge each on its MCS certification, reviews, warranties and how it treats you — a good local firm and a good national one are both fine; a poor installer of either size isn’t. Don’t let brand size override the fundamentals.
Frequently asked questions
What should I look for in a solar installer?
Above all, MCS certification (quality standard + required for export payments). Then RECC/HIES membership, genuine reviews, itemised quotes, proper warranties, insurance, and a real roof survey. A good installer explains clearly and never pressures you to sign on the day.
Why does MCS matter?
Two reasons: it proves the installer meets recognised quality standards, and your install must be MCS-certified to qualify for the Smart Export Guarantee (getting paid for exported electricity). No MCS = no export payments, which undermines the financial case. It’s a walk-away if missing.
What questions should I ask?
Are you MCS certified? RECC/HIES member? What warranties (panels, inverter, battery, workmanship) and for how long? Your generation estimate and how it’s calculated? Is the quote itemised (scaffolding, inverter, extras)? What if something goes wrong? References? Judge them by how openly they answer.
What are the red flags?
High-pressure or “today only” discounts, no MCS, won’t itemise quotes or give references, unrealistic promises, big upfront deposits, quoting without surveying your roof, no consumer-protection membership, and cold-calling/door-to-door. If you feel rushed, walk away.
How many quotes should I get?
At least three from different MCS-certified installers, for comparable systems. It reveals the fair price, exposes outliers (too cheap or too dear), and lets you compare components, warranties and service. One of the most effective things you can do.
Local or national installer?
Both can be great — MCS certification, reputation and the quote matter more than size. Local often means personal service and easier aftercare; national may offer broader guarantees. Judge each on fundamentals, not brand size.
MCS first, get three quotes, never feel pressured
The bottom line: The installer matters as much as the kit. Insist on MCS certification (it’s required for export payments too), check for RECC/HIES membership, genuine reviews and itemised quotes, and get at least three comparable quotes. Ask the key questions, and walk away from anyone using high-pressure sales or “today only” discounts. Get those basics right and you’ll land a quality install at a fair price.
Get my free quotes from vetted installers →The verdict
Choosing a solar installer needn’t be daunting if you focus on the fundamentals. MCS certification is non-negotiable — it’s both a quality standard and a requirement for the export payments that make up part of solar’s financial case. Add RECC or HIES membership, genuine reviews, itemised quotes, proper warranties and a real roof survey, and you’ve got the markers of a trustworthy installer. Then get at least three comparable quotes, ask the key questions, and — above all — never let yourself be pressured into signing on the day.
The honest truth is that a good installer is out there for every home; the trick is simply filtering out the ones cutting corners. That’s exactly what we help with: every installer we introduce you to is MCS-certified, so the most important box is ticked before you even start comparing. A couple of free, no-obligation quotes from vetted local installers is the easy, low-pressure way to begin.
Important
Going Solar UK is an introduction service, not an installer. This guide is general 2026 information to help you choose an installer, not personal advice. Always verify an installer’s current MCS certification and consumer-protection membership yourself, and satisfy yourself with any contract before signing. Certifications, schemes and requirements can change over time.
We may receive a commission when we introduce you to an installer, at no cost to you. Any contract for work is directly between you and the installer.