How to Choose a Solar Panel Installer
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The single biggest factor in whether you are happy with your solar system years from now is not the brand of panel — it is the quality of the company that installs it. A good installer designs the right system for your home, fits it cleanly and stands behind it; a poor one can leave you with underperformance, leaks or no aftercare at all. Here is how to tell them apart.
Insist on MCS certification
The Microgeneration Certification Scheme (MCS) is the quality standard for small-scale renewable installations in the UK. It is not a nice-to-have: an MCS-certified installation is required before you can claim payments under the Smart Export Guarantee. MCS certifies both the products used and the company doing the work, against recognised standards. If an installer cannot show you a current MCS certificate, walk away — you would be giving up your export income and any real quality assurance.
Look for consumer protection too
Most reputable installers are also members of a consumer code such as the Renewable Energy Consumer Code (RECC) or the Home Insulation and Energy Systems Contractors Scheme (HIES). These schemes provide a route to redress if something goes wrong, including deposit and workmanship protection. Membership signals that the company has agreed to abide by fair sales and contract practices. Our page on solar accreditations explains each badge in detail.
Get at least three quotes
Never accept the first quote without comparison. Three quotes from MCS-certified companies let you judge a fair price, spot an outlier, and compare what is actually included. Make sure each quote specifies the system size in kilowatts-peak, the panel and inverter makes, any battery and its capacity, the warranties, and a single all-inclusive price covering scaffolding, wiring and the network operator notification. Our checklist of five questions to ask a potential installer is designed to be used on each call.
Warning signs of a hard-sell operation
- Same-day "discounts". A price that is only available if you sign today is a pressure tactic, not a genuine offer. A fair quote is still fair next week.
- Vague or bundled pricing. If you cannot see exactly what you are paying for, you cannot compare — and the 0% VAT relief may be applied incorrectly.
- No site survey. A proper installer assesses your roof, shading and electrics before quoting. A figure given purely over the phone is guesswork.
- Reluctance to provide references or an MCS number. Legitimate firms are happy to share both.
- Oversized systems. Being pushed towards the largest possible array or battery, regardless of your usage, suggests a sales target rather than good design.
Local versus national installers
Both can be excellent. A well-regarded local installer often offers a more personal service and easier aftercare, while a larger national firm may have broader resources. What matters in either case is the same: MCS certification, consumer-code membership, transparent pricing, genuine local references and a clear warranty. Do not assume a big name automatically means better work, nor that a small firm cannot match it — judge each on the evidence.
Check the warranties carefully
A solar system involves several overlapping warranties: the panel product warranty (often 10–25 years), the panel performance warranty (guaranteeing a minimum output over 25 years), the inverter warranty (typically shorter), any battery warranty, and the installer's own workmanship warranty. Read what each covers and, crucially, who you call if there is a problem. An installer who will still be around in ten years to honour their workmanship guarantee is worth a great deal.
After you sign
You should receive a contract, a clear payment schedule (be wary of large upfront deposits), and after commissioning your MCS certificate and handover pack. Keep all of this safe — you will need the MCS certificate to register for the Smart Export Guarantee, and the warranties if you ever make a claim. A good installer will also explain how to monitor your system's output so you can confirm it is performing as promised.
Understanding the survey and design stage
Before any reputable installer gives you a firm price, they should carry out a site survey — either in person or, increasingly, through detailed satellite imagery and a follow-up visit. During this stage they assess your roof's size, pitch and direction, identify shading from chimneys, trees or neighbouring buildings across the day, inspect your consumer unit and check that the structure can take the load. They should then produce a design that states the proposed system size, the expected annual generation in kilowatt-hours, and a realistic estimate of your savings. Treat a quote produced without any of this as little more than a guess.
What a fair payment schedule looks like
Be cautious about large upfront deposits. A modest deposit to secure materials and a scheduling slot is normal, with the balance due on or shortly after commissioning. If a company wants most of the money before any work begins, that is a risk — and one reason consumer-code membership matters, since schemes such as RECC and HIES provide deposit protection. Always get the agreed schedule in writing within your contract, alongside the total price, the equipment specification and the start date.
Reading reviews sensibly
Online reviews are useful but should be read with a critical eye. Look for a consistent pattern over time rather than a handful of glowing or damning comments, and pay particular attention to what reviewers say about aftercare and how the company handled any problems — that is far more telling than the installation going smoothly. Where you can, ask the installer for the address of a recent local job you could look at, or speak to a past customer. A confident, reputable firm will happily oblige.
Take your time
Finally, give yourself permission to take your time. Solar is a long-term decision, and the best installers understand that a well-informed customer is a satisfied one. There is no genuine reason to sign on the spot: materials and prices do not vanish overnight, and any "today only" urgency is a sales device rather than a real constraint. Gather your quotes, sleep on them, check the accreditations, and choose the company whose design, price and manner you trust most. Done patiently, the process is far less stressful and the outcome far more likely to please you for the decades the system will sit on your roof.
