The UK solar industry has grown rapidly, and with that growth has come a wide variation in quality, pricing, and professionalism. Choosing the right installer is as important as choosing the right system — a well-designed installation from a reputable company will outperform an oversold system installed carelessly. Here’s how to navigate the selection process properly.
What Certifications Should a Solar Installer Have?
This is your starting point and your non-negotiable filter:
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MCS accreditation — The Microgeneration Certification Scheme is the UK government’s quality standard for solar installers. Only MCS-accredited companies can install systems that qualify for the Smart Export Guarantee and associated grant schemes. Check any installer’s MCS number on the official MCS database before progressing.
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NAPIT or NICEIC registration — Required for Part P electrical compliance. Registered installers can self-certify electrical work without building control notification.
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TrustMark — A government-endorsed quality scheme covering tradespeople. MCS installers are typically also TrustMark registered, providing additional consumer protection.
What Questions Should You Ask a Solar Installer?
Before accepting any quote, ask:
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Are you MCS-accredited, and can I check your number?
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Who will actually carry out the installation — your own employed engineers or subcontractors?
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What brands of panels, inverters, and batteries do you use, and why?
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Do you carry out your own electrical work and roof work, or do you subcontract?
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What does your workmanship warranty cover, and for how long?
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Will you handle DNO notification and SEG registration on my behalf?
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Can you provide references or verified reviews from recent customers?
How Many Quotes Should You Get?
Getting at least three quotes from MCS-certified installers is standard practice. This isn’t just about price — comparing quotes also reveals differences in system design, panel specification, and what’s included in the installation scope. Significant price variations (more than 20–25%) are worth investigating, as they often indicate differences in component quality, system size, or what’s included post-installation.
What Are the Red Flags to Watch For?
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No MCS accreditation — Walk away. Non-MCS installers cannot provide compliant installations.
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Pressure selling — High-pressure tactics, limited-time offers, and door-to-door sales pitches for immediate commitment are common in the solar sector. A reputable installer provides a survey, a written quote, and time to consider.
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Vague or verbal quotes — All proposals should be in writing, specifying panel brand and model, inverter brand and model, system size (kWp), expected generation (kWh/year), total installed cost, and warranty terms.
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No verifiable reviews — A legitimate, established installer will have a track record of verified customer reviews on Trustpilot, Google, or Checkatrade. Be wary of companies that only have unverifiable testimonials on their own website.
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Unusually low prices — Consistently underpriced quotes often indicate lower-quality components, inexperienced or subcontracted installers, or systems that are undersized for your needs.
What Should a Good Solar Quote Include?
A professional, detailed quote should specify:
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System size in kWp and number of panels
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Panel brand, model, and performance warranty
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Inverter brand, model, and product warranty
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Battery details if applicable (brand, capacity in kWh, warranty)
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Estimated annual generation in kWh
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Estimated annual savings and SEG income
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Full installed cost including VAT (currently 0% for domestic installations)
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Workmanship warranty duration and what it covers
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Confirmation of who handles DNO notification and building regulations compliance
Does Installer Reputation and Longevity Matter?
Yes — particularly for warranties. A 25-year panel performance warranty is only as good as the company honouring it. Choosing an established installer with a track record reduces the risk of your warranty being unsupported if the company ceases trading. Check Companies House records for trading history, and be cautious of recently formed companies with no public track record.
The Part Nobody Talks About: The Post-Installation Relationship
Most solar purchasing decisions are made on price and specification — but the post-installation relationship matters more than most homeowners realise. A good installer will:
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Commission the system thoroughly and walk you through the monitoring app
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Register your system with the DNO and your chosen SEG supplier on your behalf
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Be reachable if you have questions or performance concerns in the months after installation
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Provide clear documentation for your home insurance, mortgage lender, and future property sale
The installers who do all of this well are the ones who’ve been in business long enough to understand that reputation is built on every customer interaction — not just the day of installation. When reviewing feedback, look specifically for comments about aftercare, communication, and how problems were handled — not just about whether the panels went up on time.
HomeKog’s verified reviews reflect this end-to-end experience, with customers regularly citing the quality of advice, installation, and ongoing support as differentiators.
