Choosing the right solar panel installer is the single most important decision you’ll make when switching to solar. A great installer maximises system performance, protects your warranty and gives ongoing support – while a poor install can cost you thousands over the lifetime of the system in repairs and corrections.
SolarTherm UK has created this homeowner friendly 9-step checklist so you can choose with confidence and book a no obligation quote from an installer who understands roofs, regulations and real savings.
Our 9-Step Checklist to Choosing the Right Installer (and Why it Matters)
- Know your options – panels, batteries, EV charging and more
Decide what you want from day one: a basic PV system, battery storage, EV charging or future proofing for a heat pump. Knowing your goals helps installers give accurate quotes and avoids costly rework later.
- Verify credentials and track record
Always check whether an installer works with accredited products and follows industry best practices. Ask about third-party verification, customer case studies and whether they can show finished projects. Your installer at a minimum should be MCS-certified, but also look out for installers who are members of EPVS (Energy Performance Verification Scheme) and HIES to protect your investment.
- Read reviews
Online reviews are the clearest picture of how an installer treats customers after the sale. Ask for pictures of completed installations, read case studies and use Google and Trust Pilot to get a clear understanding of your installer and their practices.
- Make sure they have clear policies
A reputable installer will explain scaffolding arrangements, site safety, permitted works and precisely what is and isn’t included in the price. If terms are vague, it is likely to be a red flag, resulting in additional costs during installation.
- Understand the installation process
A professional installation follows a clear path, home survey, structural check, bespoke system design, full documentation, installation and a final handover with system commissioning and monitoring set up. Ask for a timeline and a visual of the proposed layout.
- Shop for price and value – compare multiple quotes
Get at least 2-3 detailed quotes. Compare not just price but panel and inverter brands, expected generation, warranties and workmanship guarantees and financing options. The lowest price is not always the best value, and cheaper usually means something is being missed out.
- Choose a local or regional installer where possible
Local installers are more likely to understand regional planning rules, have faster response times for maintenance and have working relationships with local suppliers and your DNO (Distribution Network Operator). They’re also easier to check in person and more accountable if something goes wrong. Local installers are also less likely to use sub-contractors, so you know who your installer will be.
- Take your time – avoid high-pressure sales techniques
A confident installer will give you time to decide. If someone is rushing you into a contract or offering you limited time deals, step back. A sensible proposal should include a visual design, product specifications and a clear path. Unrealistic savings claims and overinflated estimates are a red flag, an installer who provides EPVS verified performance and returns estimates have had their figures checked for accuracy.
Understanding Structural Checks and Surveys
Before any install, your roof should be surveyed for condition and load bearing capability. A quality installer will confirm roof condition and repair or replacement needs and any strengthening that is required prior to install. They will also explain the type of roof fixings and expected finish of your solar PV installation.
Finance and Savings – What to Ask
Solar can be paid for outright or via finance. When comparing offers, ask about APR, total payable and any fees. Compare expected annual savings and payback times, estimates can vary by usage, location and system size. The most accurate estimates are provided with evidence of your current electricity usage and a design that is bespoke to your property.
Why Choose SolarTherm UK
If you’d like to start your journey right away, SolarTherm UK can provide a free, no obligation quote, tailored to your home, usage and future energy needs. We’ll walk you through product choices, warranties and finance options. Our expert design team will work with you to plan the perfect solar PV system for your property. From initial enquiry to installation to first class aftercare, our solar team will guide you through the process, answering any questions you may have with expertise and understanding. With over 15 years experience in the solar industry, SolarTherm UK has helped thousands homeowners across Essex, Kent, London and the wider South East, save money on their energy bills and take back control of their power by generating their own free electricity.
Contact SolarTherm UK today for a free no obligation quote and design, tailored to your home, usage and future energy needs. No hard sell, just honest, expert advice.
Your home. Your energy. Your future.
Frequently Asked Questions
How long does installation take?
A typical solar PV system takes less than one day to install, with more complex systems or roof designs taking up to three days. Your installer will give a detailed timeline.
Do I need planning permission?
Most domestic rooftop solar PV systems don’t need planning permission under Permitted Development Rights, exceptions exist, if you’re unsure speak to your installer and they will be able to advise.
Will solar increase my property value?
Evidence suggests that a high quality solar installation with the correct warranties and certifications can increase buyer appeal and increase property value by up to 14%.
What paperwork do I need to do?
Your installer should handle all necessary paperwork including your DNO application and MCS certification. If planning permission or listed building consent is required your installer can assist in completing these applications.
