Are Solar Panels Worth It in the UK?

For many UK homes, solar panels are worth it, but the payback is usually long. Published estimates in the sources we checked range from about 7 to 15 years. Your result depends on your roof, your daytime power use and the price you pay, so run the numbers for your own home.

What “worth it” really means

Solar is a long-term purchase. You pay once, then save on bills for decades. A system is worth it if the savings and export income exceed its cost over its life, and if you are happy to wait for that return.

Money is only part of the picture. Some owners also value lower exposure to rising power prices, a better energy rating and a smaller carbon footprint. However, we focus on the money here, because that is where the sums can mislead.

The three numbers that decide it

Three figures settle the question. They are the cost of the system, the yearly benefit and the lifespan. You can estimate each one before you speak to an installer.

The cost is the first number. Our guide to how much solar panels cost shows typical prices, such as about £7,000 for a 3.5 kWp system according to Which?, citing the Energy Saving Trust.

The yearly benefit is the second number. It combines the bills you avoid and the export payments you earn. The Energy Saving Trust’s calculator gave about £495 a year for a 4.5 kWp example, using April 2024 prices.

The lifespan is the third number. Panels often carry performance warranties of 25 years or more, although inverters usually need replacing sooner. Check the warranty terms in any quote, because they set the period you can count on.

A simple payback sum

Divide the cost by the yearly benefit to get a rough payback in years. The Energy Saving Trust example cost about £7,100 and saved about £495 a year. That gives roughly 14 years, which is our own arithmetic.

This sum is crude. It ignores later price changes, so it can look too gloomy if power prices rise. It also assumes that you use 35% of the power you make, so a home that uses more in the daytime would do better.

Who gains the most

Homes with high daytime use gain the most, because they use more of the power the panels make. People who work from home, households with young children, and homes with electric heating or a car charger all fit that pattern. Our page on EV charger installation explains how a charger fits in.

A mostly unshaded roof facing south, south-east or south-west also helps. East and west roofs still work, although output is lower. Shade from trees or tall buildings can cut output a lot, so ask for a shade analysis.

Who gains less

Homes that are empty all day export most of their power, and export pays less than the price you avoid when you use your own. Heavily shaded roofs also struggle. Meanwhile, people who plan to move within a few years may not recover the cost, although some buyers will pay more for a home with solar.

What can improve the sums

Several things can move the result in your favour. VAT on installation is 0% until 31 March 2027, which cuts the cost. A good export tariff can lift your income, as our guide to selling electricity back to the grid explains.

A battery changes the picture too, although it adds cost. Read our guide on whether solar batteries are worth it to see when storage pays. Likewise, good upkeep protects output, as our page on solar panel maintenance explains.

Does it depend where you live

Yes, a little. The South West of England gets more sunshine than the North, so panels there often make more power. Scotland has fewer winter daylight hours, but long summer days still help. Local rules, housing and support also differ.

See our local guides to solar panels in Bristol, solar panels in Cardiff, solar panels in Leeds and solar panels in Liverpool.

Our view

For a home with a good roof and daytime use, solar can be a sound long-term purchase. For a shaded roof or an empty home, the case is weaker. Because quotes vary, compare at least three, as our guide to comparing solar quotes explains. If you hope for a grant, read our guide to free solar panels first.

Sources

• Energy Saving Trust: solar calculator
• Which?: solar panel costs
• GOV.UK: VAT on energy-saving materials (Notice 708/6)

Want quotes to test the sums? Use our contact form and we will pass your enquiry to MCS-certified installers who cover your area.