How to Choose a Solar Installer in the UK
How to Choose a Solar Installer in the UK: The Honest 2026 Checklist
The short version
Most solar regret isn’t about panels — it’s about the company that fitted them. In 2026 the basics still hold: MCS certification, RECC or HIES consumer-code membership, insured deposits and a workmanship guarantee worth having. But this year’s MCS scheme shake-up changed what protection looks like, so old checklists miss things. Here’s my vetting order: credentials first, then quote forensics, then payment protection — with the exact questions I’d ask before signing a single thing.
Start with the badge — but don’t stop there
MCS certification is where I start every vetting job, and where you should too. It’s the government-backed Microgeneration Certification Scheme, running since 2007, and it’s the gatekeeper for the two things that make solar pay: Smart Export Guarantee payments and most grant schemes. No MCS certificate, no export income. Simple as that.
The market it polices is booming. Certified installers completed 267,032 solar PV systems in 2025 — a record that beat the old 2011 high by 31% — and another 148,531 in the first half of 2026 alone. MCS lists over 5,600 certified installing companies across all technologies. Plenty of choice, and plenty of rope for the careless.
Here’s the part most 2026 checklists haven’t caught up with. MCS is mid-way through its biggest redesign since launch, and it changes what “certified” protects you against. Under the old rules, every certified installer had to belong to a consumer code — RECC or HIES — and that membership carried your deposit protection and insurance-backed guarantee. Under the redeveloped scheme, consumer-code membership becomes optional once a firm transitions across. Instead, installers buy an MCS-approved financial protection product per job. In plain English: the protection on offer now varies more between installers than it used to, so you have to ask.
| What matters to you | Old scheme | Redeveloped scheme |
|---|---|---|
| Workmanship guarantee minimum | 2 years | At least 6 years of MCS-approved cover |
| Consumer code (RECC/HIES) | Mandatory for all certified installers | Optional once transitioned — ask what replaced it |
| If something goes wrong | Complaint via the installer’s consumer code | MCS is the centralised contact for certification issues; RECC-member installer complaints route through the Green Homes Dispute Resolution service (GHDR), running since January 2026 |
| Your certificate | Issued within 14 days of commissioning | Within 30 days — chase it, you need it for SEG |
| Installer assessments | Roughly annual | Risk-based: every 3 years for clean-record firms |
None of this makes MCS worse. It makes your five minutes of checking more valuable, because a logo on a van no longer tells you which protection product sits behind your deposit. Our guide to what MCS certification actually covers in 2026 goes deeper, including how to spot an expired certificate.
🧠 My vetting order, every time
Credentials first (MCS active, Solar PV scope, protection product named). Then quote forensics (£ per kWp, named components, real survey). Only then price. Flip that order and you’ll happily overpay for a system nobody insured.
RECC, HIES and the money you hand over first
Consumer codes are the unglamorous layer that saves people when a sale goes sour. RECC, the Renewable Energy Consumer Code, is approved by Trading Standards and binds members to honest selling: no high-pressure tactics, deposits capped at 25% of the contract value and insured, a 14-day cooling-off period for off-premises sales, written quotes with realistic performance estimates, and free access to an ombudsman. HIES, the Home Insulation & Energy Systems scheme, offers a similar net plus its own inspectors, mediation and a compensation fund for ombudsman awards.
| Scheme route | What’s covered | Protection window | Where you claim |
|---|---|---|---|
| HIES | Up to 25% of contract value, capped at £5,000 | 120 days | hies.org.uk |
| RECC via QANW | Deposits and stage payments | 35 days | Insurer named on your certificate |
| RECC via CPA / Ark / Peacock | Deposits and stage payments | 120+ days | Insurer named on your certificate |
| MCS-approved protection product (post-transition) | Varies by product — ask for the certificate | Set by the product | Named provider |
Read that table before you pay a deposit, not after. The window matters: a deposit insured for 35 days is fine for a quick install and useless for a quote signed in October with a March slot.
💡 The combination I call “safe to sign”
Active MCS certification for Solar PV, plus RECC or HIES membership (or a named MCS-approved protection product), plus a workmanship guarantee of at least 10 years. Two out of three is a conversation. One out of three is a walk.
Quote forensics: reading three quotes like a pro
Get three quotes, from three separately owned installers — not three visits from the same national reseller’s salesmen. Then stop comparing totals and start comparing specifications. The single most useful number in solar is price per kWp: divide the quote by the system size. In 2026, a fairly priced domestic system lands around £1,500 to £1,700 per installed kWp — England’s own average sits at about £1,591/kW — 0% VAT included.
| System size | Panels (approx) | Fair installed range | Suits |
|---|---|---|---|
| 2–3 kWp | 6–8 | £4,000–£5,500 | 1–2 bed home |
| 4 kWp | 9–10 | £5,500–£7,500 | Typical 3 bed semi |
| 5 kWp | 11–12 | £7,500–£9,000 | 4 bed home |
| 6 kWp | 13–14 | £8,500–£11,500 | Large home / EV charging |
| + 5kWh battery | — | Add £2,500–£4,000 | Anyone out at work all day |
| + 10kWh battery | — | Add £4,000–£6,000 | Bigger household, evening-heavy use |
Those bands are wide on purpose. On the same street, quotes for an identical system can differ by 30 to 40% depending on overheads, scaffolding needs and how busy a firm is. Some of that gap is legitimate — roof complexity, panel tier, microinverters versus a string inverter. Some of it isn’t. Our breakdown of what MCS-linked price data really shows separates the two, and the full cost hub has the size-by-size detail.
What a proper written quote names
- Panel and inverter brand and model number — “high-quality panels” is not a specification.
- A physical site survey before any fixed price. Roofs lie in photographs.
- Scaffolding, DNO notification (G98/G99) and the MCS certificate, explicitly included.
- A generation estimate based on your roof and shading, not a national average.
- The workmanship guarantee length, and who insures it.
Red flags I’d walk away from
The UK solar market lost a worrying number of companies through 2025 and 2026, and the casualties left a trail of half-finished roofs and uninsured deposits. The warning signs were almost always visible before signing:
- A deposit above 25% of the contract value, or any push for cash upfront. RECC members can’t take more; anyone asking is telling you something.
- “Sign today” pricing. A discount that expires before you can get two more quotes isn’t a discount, it’s a trapdoor.
- Doorstep and canvassed sales with a van outside. Legitimate firms do exist that knock, but the cooling-off period exists for a reason — use all 14 days.
- No named components and no model numbers on the quote.
- A fixed price with no survey. It’s a guess wearing a suit.
- £10,000+ for a plain 4kWp system with no battery and no complex roof. Get it justified in writing, or get a third quote.
- “Free solar” rent-a-roof or loan structures dressed as grants. They can follow the house, not the owner, and scare off future buyers.
If the worst happens anyway, stop paying, check Companies House, and work out how you paid — our step-by-step on what to do when an installer goes bust mid-install covers exactly that order of operations.
Paying in a way that protects you
How you pay is half your protection, and it’s the half people forget in the excitement. Put at least the deposit — ideally every stage payment — on a credit card. For purchases between £100 and £30,000, Section 75 of the Consumer Credit Act makes your card provider jointly liable, which turns a vanished installer into the card company’s problem. If you’re using finance, check the agreement date: from 15 July 2026, new FCA rules extend similar lender liability to many solar finance and buy-now-pay-later agreements taken out on or after that date.
Then keep the paper. Your insurance-backed guarantee or protection-product certificate names the insurer. File it with the MCS certificate the moment both arrive, because those two documents are what a solicitor, a buyer’s surveyor and an insurer will ask for years from now.
Warranties and aftercare: who owes you what
People blend warranties together and then feel betrayed when the wrong party stops answering the phone. They’re separate promises from separate parties:
| Cover | Typical length | Who owes it | Survives installer insolvency? |
|---|---|---|---|
| Panel product warranty | 10–25 years | Manufacturer | Yes |
| Panel performance warranty | 25–30 years | Manufacturer | Yes |
| Inverter / battery warranty | 5–15 years / ~10 years | Manufacturer | Yes |
| Workmanship guarantee | 2–10 years (10+ from good firms; 6-year minimum under new MCS rules) | Your installer — or their insurer if IBG-backed | Only if insurance-backed |
Aftercare is also where the redeveloped MCS scheme helps you directly: certification complaints now centralise with MCS itself, and RECC-member installer complaints route through the Green Homes Dispute Resolution service (GHDR, live since January 2026), rather than bouncing around an installer’s own code — which matters most when the original firm has stopped trading or stopped caring.
The 2026 money context, in three lines
Three numbers shape the timing conversation, and a good installer will quote them accurately rather than as pressure. First, installation VAT is 0% on domestic solar and batteries until 31 March 2027, reverting to 5% afterwards, per HMRC’s VAT notice 708/6 — worth roughly £300 to £500 on a typical system, real but not a reason to sign blindly. Second, export income runs through the SEG, where rates run from as little as 3 to 4p on lazy variable tariffs, up through the low-to-mid teens on the best open-to-all fixed deals, into the mid-20ps on installer-exclusive fixes, and as high as 32p on battery-linked time-of-use tariffs — shop around after install, don’t accept your installer’s default. Third, ECO4 closes on 31 December 2026; if your household is low-income in a poorly insulated home, that fully funded route is worth checking before you spend your own money at all.
The ten questions I’d ask every installer
- What’s your MCS certificate number, and is it active for Solar PV specifically?
- Which certification body issued it, and are they UKAS-accredited?
- Are you RECC or HIES registered — or which MCS-approved protection product covers this job?
- How is my deposit insured, for how many days, and who is the insurer?
- What exactly is the workmanship guarantee length, and is it insurance-backed?
- Which panel and inverter models are in this quote, and are they on the MCS product directory?
- Does the price include scaffolding, DNO notification and my MCS certificate?
- What generation estimate do you predict for my roof, in kWh per year, in writing?
- Who handles aftercare and fault call-outs in years two to ten — your own engineers or a subcontractor?
- Can I see two references from installs you completed on roofs like mine in the last 12 months?
An honest firm answers all ten without sighing. The ones who rush question four are the ones question four was written for.
FAQs
How do I check a solar installer is genuinely MCS certified in 2026?
Search the live MCS installer finder at mcscertified.com, confirm the certificate is active and covers Solar PV specifically, and ask which UKAS-accredited certification body issued it. New for the redeveloped scheme, also ask which MCS-approved financial protection product covers your job: consumer-code membership stops being automatic once installers transition across, which every certified firm must do by 31 March 2027.
How many quotes should I get, and what is a fair price for a 4kW system in 2026?
At least three, from separately owned MCS certified installers rather than three arms of the same national reseller. A fair 2026 range for a 4kWp system is roughly £5,500 to £7,500 fully installed with 0% VAT — England’s own average sits around £1,591 per kWp — and adding a battery typically adds £2,500 to £4,000 for a 5kWh unit or £4,000 to £6,000 for a 10kWh unit. Quotes on the same street can differ by 30 to 40%, so compare £ per kWp and named components, never just the total.
What protects my deposit if my solar installer goes bust mid-install?
If your installer belongs to RECC or HIES, deposits and stage payments must be insured: HIES covers up to 25% of the contract value, capped at £5,000, for 120 days, while RECC insurers run from 35 to 120-plus days depending on the provider named on your certificate. Putting even the deposit on a credit card adds Section 75 protection for purchases between £100 and £30,000, and finance agreements taken out on or after 15 July 2026 carry similar FCA protection. Manufacturer warranties on panels, inverter and battery keep running regardless.
Key sources: MCS (installer counts, 2025 record of 267,032 solar PV installs, H1 2026 totals, redeveloped-scheme rules and 31/03/2027 transition date); RECC and HIES consumer-code rules on deposits, cooling-off and dispute resolution, including the Green Homes Dispute Resolution service (GHDR) launched January 2026; Ofgem and DESNZ on ECO4’s 31/12/2026 end date; HMRC VAT notice 708/6 on 0% relief to 31/03/2027; supplier tariff tables and comparison data for 2026 SEG rates; FCA rules on lender liability from 15/07/2026.
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