How to Choose a Solar Panel Installer: A Cheltenham Buyer's Guide

Start with MCS certification

MCS (the Microgeneration Certification Scheme) is the single most important credential to check before you hire a solar installer. MCS certifies that both the installer and the products they fit meet recognised quality and safety standards. It matters for a practical reason as well as a quality one: you can only claim Smart Export Guarantee payments for the electricity you export if your system was installed by an MCS-certified company and you hold an MCS certificate. Hire a non-certified installer and you forfeit that income entirely. MCS certification is specific to technologies, so confirm the firm is certified for solar PV, not only for another technology such as heat pumps. You can verify any installer's status directly on the MCS website using their company name or certificate number. Treat MCS as a pass or fail gate: if a firm cannot evidence current solar PV certification, do not proceed, however attractive the price.

RECC and HIES consumer protection

Beyond technical certification, a reputable installer belongs to a consumer protection code. The two that matter for solar are RECC (the Renewable Energy Consumer Code) and HIES (the Home Insulation and Energy Systems scheme). Both set standards for how installers advertise, sell and deliver work, and both provide protections that matter if something goes wrong: deposit protection, workmanship guarantees and access to independent dispute resolution. Installers typically belong to one of the two rather than both. Membership of RECC or HIES is also a requirement of MCS certification, so a properly accredited firm should be able to name its code and show its membership number. If an installer cannot tell you which consumer code they belong to, that is a meaningful red flag about how they run their business.

Warranties: panels, inverter and workmanship

A solar system has three separate warranties, and a good installer explains all of them in writing. Panel warranties usually cover both the product (often 12 to 25 years) and the performance, guaranteeing the panels still produce a set percentage of their rated output after 25 years. Inverter warranties are typically shorter, around 5 to 12 years, because the inverter is the component most likely to need replacing during the system's life. Workmanship warranties cover the installation itself, including the roof seal, and commonly run 2 to 10 years. Ask who honours each warranty and what happens if the installer ceases trading: this is where RECC or HIES backing and an insurance-backed guarantee become valuable. Compare warranties as carefully as you compare prices, because a cheaper quote with a short inverter warranty can cost more over time.

Why you should get multiple quotes

Solar quotes vary widely for the same roof, so we recommend comparing at least three written quotes before you commit. Quotes differ on system size, panel and inverter brand, whether a battery is included, warranty length and price, and the only way to see who offers genuine value is to lay them side by side. Comparing also gives you negotiating room and helps you spot an outlier, whether that is a suspiciously cheap quote that cuts corners or an inflated one. Make sure each quote covers the same essentials so the comparison is fair.

• System size in kW and the exact number of panels.
• The specific panel and inverter make and model.
• Whether battery storage is included, and its capacity.
• Estimated annual generation for your roof.
• All warranties, stated in years.
• The total price, inclusive of 0% VAT.

Questions to ask before you sign

1. Are you MCS-certified for solar PV, and what is your certificate number?
2. Which consumer code do you belong to, RECC or HIES?
3. Will your own employees carry out the work, or subcontractors?
4. What exactly do the panel, inverter and workmanship warranties cover, and for how long?
5. Is the quote fixed, and what could change the final price?
6. What deposit do you require, and how is it protected?
7. Can you provide an MCS certificate and SEG documentation on completion?

A confident, established installer will answer all of these without hesitation and put the answers in writing. Vague or evasive responses tell you as much as the answers themselves.

Red flags to walk away from

• High-pressure sales: discounts that expire today, or pressure to sign on the first visit.
• No MCS certification: disqualifies you from SEG income and signals poor quality control.
• Large upfront deposits: anything beyond a modest, protected deposit is a warning sign.
• Vague quotes: no panel or inverter model, no generation estimate, no warranty detail.
• No consumer code: a firm that cannot name RECC or HIES membership.
• Cold-call or doorstep selling: legitimate installers rarely sell this way.

If a quote ticks one of these boxes, pause. If it ticks two or more, walk away. A solar system is a long-term investment in your home, and there are plenty of reputable installers who will earn your business properly.

How our matching service helps

We are an independent comparison service, not an installer. We help Cheltenham and Gloucestershire homeowners find and compare vetted local installers, and we only connect you with firms that hold the relevant accreditations such as MCS. You tell us about your home once, we match you with suitable accredited installers, and you compare their quotes side by side with no obligation. It costs nothing and there is no pressure to proceed. Think of us as the step that saves you chasing quotes one by one and lets you focus on choosing well.

Deposits, payment staging and your protection

How an installer asks you to pay tells you a lot about how they run their business. A reasonable structure is a small deposit on signing, typically 10% to 25% of the total, with the balance due on completion once you are satisfied and have received your MCS certificate. Some firms ask for a deposit at survey stage and a second payment when materials arrive, with the final amount on sign-off. Both approaches are normal. What is not normal is a request for full payment upfront or a majority of the cost before work begins. If the firm belongs to RECC or HIES, your deposit is protected under the consumer code, meaning you can recover it if the installer fails to deliver. An insurance-backed guarantee from a third-party insurer extends that protection to the workmanship warranty period. Ask for written confirmation of how the deposit is protected and who underwrites the guarantee. If neither the code nor an insurer backs your money, you carry all the risk.