What happens during a solar panel installation?
A solar panel installation is a short list of steps: you size up a system, get quotes, book an installer, and the installer fits the mounts, panels and inverter and tests it all. The Energy Saving Trust sets out the same order in its own guide, last updated on 1 October 2026.
Most of the effort sits before the scaffolding goes up. If you do nothing, your electricity bill carries on as it is. If you want to look at solar, this guide covers the solar panel installation process, the costs and the questions worth asking first.
Prices and savings vary by home, so treat every figure below as an estimate and get your own quotes.
How does solar panel installation work, step by step?
The Energy Saving Trust lists six stages for a home solar panel installation. They run in this order:
- Use a solar panel calculator to get an idea of the system size that suits your home.
- Get quotes from at least three installers, and make sure they are MCS certified. It is also worth asking for a quote for a solar battery.
- Agree a quote and book an installation date.
- The installer puts up scaffolding, then adds the mounts, panels and battery.
- The inverter is connected to your home so you can start using the electricity.
- The installer tests the system and talks you through how it works.
The Energy Saving Trust says MCS certification means an installer follows a strict code of conduct. Your installer should also leave written details of maintenance checks, including the main inverter fault signals and basic troubleshooting.
Ask for that written guide at the end of the solar panel installation. It is much easier to ask on the day than to chase it later.
How much does solar panel installation cost?
The Energy Saving Trust says a typical home system is around 4.5 kWp and costs around £7,600 to install. That is an average, and your quote could be higher or lower.
The cost of solar panel installation depends on several things, according to the Energy Saving Trust:
- the size of the system
- how hard it is to reach your roof
- whether you choose panels or roof tiles
- whether the panels are built into the building
- whether the roof covering needs renewing
You may be able to lower the cost if you already have scaffolding up for roof repairs, or if you are building a new house. Ground mounted systems are harder to price, because the frame and the distance from the house both change the bill.
Quick facts
- Typical home system: around 4.5 kWp.
- Typical cost: around £7,600, according to the Energy Saving Trust.
- Panels should last 25 years or more.
- An inverter needs replacing after around 12 years.
How long do solar panels take to pay for themselves?
The Energy Saving Trust puts the payback at roughly 9 to 12 years for the locations it modelled. It is based on fuel prices as of July 2026 and includes export payments for homes in England, Scotland and Wales. The Energy Saving Trust says a Northern Ireland payback figure will be added in its next update, so if you live there, these numbers do not yet apply to you.
For a home that is occupied all day, it gives 9 years in London, 10 in Manchester, 9 in Aberystwyth and 11 in Stirling. Homes that are out all day come out a year longer in Manchester, Aberystwyth and Stirling, and the same in London. These are estimates, not promises, and a different roof, supplier or usage pattern will change them.
Your payback also depends on how much of the electricity you use yourself and whether you sign up for export payments. Our guides to SEG rates and solar export tariffs explain how selling spare power works, and our guide to home battery storage looks at whether a battery is worth adding.
Can you get a grant for solar panel installation?
There are no dedicated solar panel grants from the UK Government, according to the Energy Saving Trust. You may get funding as part of other government schemes, and it suggests asking your energy supplier whether it offers any help.
The Energy Saving Trust also says the Warm Homes Plan is set to invest close to £15 billion in improving the UK’s homes to cut energy bills. It says there will be fully funded government support to install solar panels for people on low incomes, and low and zero interest loans for homeowners regardless of income. It adds that it will update its guide when more is known, so check before you commit.
We have covered one part of this in our news story on the Warm Homes Loan, which is still missing lenders and rates.
Frequently asked questions about solar panel installation
- How long do solar panels last?
- The Energy Saving Trust says panels should last 25 years or more, but an inverter needs replacing after around 12 years.
- Do I need an MCS certified installer?
- The Energy Saving Trust advises using MCS certified installers, which it says means they follow a strict code of conduct. Get quotes from at least three.
- Do solar panels work on cloudy days?
- Yes. The Energy Saving Trust says the cells do not need direct sunlight and can even work on cloudy days, although stronger sunshine produces more electricity.
- Do solar panels need much maintenance?
- Not much. The Energy Saving Trust says the main job is trimming nearby trees to reduce shade, and that rain should clean panels tilted at 15 degrees or more.
Sources
- Energy Saving Trust, solar panels, last updated 1 October 2026. Source of the six installation stages, the MCS code of conduct point, the written maintenance details, the 4.5 kWp and £7,600 figures, the cost factors, the 25 year panel life and 12 year inverter replacement, the payback table for London, Manchester, Aberystwyth and Stirling based on July 2026 fuel prices with export payments for England, Scotland and Wales, the Northern Ireland note, the position on solar grants, the Warm Homes Plan £15 billion figure, the cloudy day point and the 15 degree tilt cleaning point.
Checked 9 November 2026.
