12 solar panels cost

Today, we will be reviewing the 12 Solar Panels Cost. Solar-powered homes are the future. With fossil fuels rapidly running out and greenhouse gases giving the Earth a hard time, it’s no surprise that so many people are turning to the sun. Solar panels will completely transform your energy bills, and the new Smart Export Guarantee launched on 1st January 2020, meaning more money for households exporting renewable energy.

Now’s a great time to get involved – over 840,000 UK homes have solar panels, and the cost has fallen by a whopping 70% since 2010. The state of UK renewables is excellent, meaning that switching to solar energy is a smart decision (and you don’t have to live in sunny California to use it).

solar panels by the Italian coast

12 Solar Panels Cost

Solar panels for the average household in the UK cost roughly between £4,000 and £6,000. A family of three typically needs a 3kW solar PV system, which consists of about 10 x 300W panels, and requires around 20m² of roof space.

The higher the efficiency and power of your panels, the more electricity your home will generate – as long as you keep them clean.

According to data from Which? between 2015 and 2018, the average cost of a 3.6-4kWp* solar panel system in the UK is £6,672.

* The power of a photovoltaic (PV) cell is measured in kilowatt peak (kWp), which is how much energy it can generate at peak performance during the summer.

The good news is that solar panels just keep on getting cheaper. Back in 2010, the average price of a 4kW solar PV system was around £20,000, which means the cost of solar power has fallen by about 70% in the past nine years.

The majority of solar panels are around 250 watts, which means you’d need four panels to create a 1 kilowatt peak (1kWp) system, eight panels to create a 2kWp system, 12 panels to create a 3kWp system, and so on. A single solar panel costs around £400-£500.

Here’s a breakdown of residential solar panel costs in the UK, including required roof space and average annual electricity output.

The output potential of solar PV systems varies depending on location, for example a 4kWp system in the sunny south of England can generate about 4,200 kilowatt hours of electricity each year, but put it in Scotland and the figure is closer to 3,400 kilowatt hours.

Please use these cost estimates as an indication only – to receive tailored quotes for your own solar panel installation, simply fill in the form at the top of the page.

Solar PV system sizeNumber of solar panelsCostRoof spaceAnnual electricity outputSuitable forAnnual CO2 savings
1kWp4£1,500 to £3,0008m²850kWh1 adult0.26 tonnes
2kWp8£3,000 to £5,00014m²1,700kWh2 adults0.51 tonnes
3kWp12£5,000 to £6,00021m²2,550kWhFamily of 30.77 tonnes
4kWp16£6,000 to £8,00028m²3,800kWhFamily of 4+1.14 tonnes

Information last updated in January 2020.

Just for some context, an economy class passenger on a return flight from London to New York will be responsible for approximately 1.2 tonnes of CO2. That’s pretty much equivalent in size to a three-bedroom house (about 550 cubic metres).

Cost of solar panels for a three-bedroom house

A family of three or more will need a 3-4kWp solar panel system, which will provide them with around 3,000 kWh of annual electricity. This system consists of approximately 12-16 panels, and requires up to 28 square metres of roof space.

Cost of solar panels for a small household

If you’re in a one-bedroom or two-bedroom property, a 1-2kWp solar panel system will produce more than enough electricity (up to 1,700 kWh per year). This system consists of 4-8 panels, and needs up to 14 square metres of roof space.

How much will 12 solar panels cost me?

To find out exactly how much you’ll need to pay for your home’s solar panel system, it’s important that you make an appointment with a professional installer. They will come round to assess your property, work out what type of solar PV system you need, and advise you on all the costs.

We can help put you in touch with the right people. To use our quick quote-finder, simply fill in our short form, and our qualified installers will be in touch. From there, you can make an appointment, get a proper understanding of the costs, and kickstart the process of switching to solar power.

To find out why it’s sensible to buy reliable, premium solar panels, check out our guide to cheap solar panels (and why they aren’t worth the risk)!DID YOU KNOW?

You can save more than £400 each year, just by switching your home’s energy supplier. If you’re looking to cut down your bills, this one’s a bit of a no-brainer.

That’s why we’ve partnered with Switchd. With four different price plans (including a free option), Switchd will find you cheaper, greener energy suppliers in no time.

What’s more, we recently conducted some research and made a rather exciting discovery. Based on our findings, if you purchased a 3.5kW solar PV system today, you’d break even by around 2037, earning almost £12,000 on energy bill savings and SEG earnings. Check out the graph below for a better idea of what we’re talking about.A Flourish chart

We used a lot of information to put this study together. To learn more, check out our full methodology.

If you’re interested, we also have a complete guide to renewable energy vs fossil fuels.

Solar panel price calculator

Let’s ask the machine!

Our solar panel cost calculator gives you an estimate of how much it costs to install solar panels, the amount of roof space they’ll need, and how much electricity they’ll produce in a year. Just push its buttons and let it do the rest.

Not sure how many solar panels you’ll need? According to Smarter Business, the average UK household uses about 3,100 kWh of electricity each year, which equates to between 12 and 16 panels. Most solar panels come in one standard size; about 1.6m x 0.9m (and around 5cm thick).

Please note: these costs are estimated and based on industry averages. They are not an exact indication of how much you’ll be charged by a solar panel installer. For a tailored quote, use our quote-finder tool, and talk directly to qualified solar panel installers near you.

How are solar panel prices calculated?

There are three key factors that influence the price of solar panels. The cost estimates above can be used as a rough guide, but you’ll also want to think about the type of panels you want, how efficient they are, and how many you need.

Panel type

Most solar panels are made from silicon, which comes in two different forms; monocrystalline or polycrystalline. Monocrystalline cells are smaller, more durable, and more efficient than polycrystalline cells, so they come at a higher price.

Panel efficiency

The ‘efficiency’ of a solar panel refers to how much sunlight it can convert into electricity, represented as a percentage. For example, if a solar panel has 19% efficiency, this means it can convert 19% of its received sunlight into energy for your home. Currently, the best solar panels on the market are nearly 23% efficient, but the average is between 15% and 18%.

Number of panels

This one’s quite self-explanatory; the larger your solar PV system, the more panels you’ll be buying, and the more you’ll pay. As indicated in the table above, a 1 kWp system consists of about four panels, while a 4 kWp system consists of around 16 panels.

You can reduce the number of panels you need by opting for high-efficiency models, but if you have the roof space, it’s generally more cost effective to buy a larger number of cheaper, less efficient panels.

Do you really save money with solar panels?

Solar panels are a great way to reduce your energy bills, because they allow you to create your own power instead of buying it from the National Grid. Once you’ve got your shiny new solar panels installed on your roof, you’ll be fuelling up on good, clean, complimentary sunlight.

According to the Energy Saving Trust, a standard 4 kWp system in Southern England can save you up to £390 year, providing you’re at home during the day. If you’re out all day until 6pm, annual savings are closer to the £300 mark. This is also factoring in earnings from the Smart Export Guarantee.

What’s more, 84% of the 390 UK homeowners we surveyed in January 2018 said that their solar panels are saving them up to 50% on their monthly energy bills.

Take a look at how much money solar panels could save you, depending on where you’re located in the UK and how much time you spend at home (source: Energy Saving Trust). You can also find out more on our page about whether you should invest in solar panels (you should).

Location in the UKOut all day (until 6pm)At home all day
London, England£90£220
Manchester, England£85£210
Aberystwyth, Wales£90£210
Belfast, Northern Ireland£85£210
Stirling, Scotland£85£205

Information last updated in March 2019.

Energy bill savings from solar panels ultimately depend on two things: how much electricity your solar panels produce, and how much of this electricity you use. The more you can get out of your solar power, the less you’ll rely on the National Grid.

For example, solar power only works during the daytime, which means you won’t get much use out of your solar panels if you’re never at home during the day.

As you can see, someone who barely leaves the house in London will generate and use much more electricity than someone in Stirling who’s only at home during the evenings – meaning more savings for the Londoner.

This is where a solar battery comes in useful.

Should I get a solar battery?

On average, UK homes with solar panels use only 25% of the electricity they create – that’s a lot of free solar energy going to waste.

The peak times in the day for people using electricity in their homes are the mornings and evenings, which is when the sun is either rising, setting, or gone completely.

Meanwhile, solar panels produce the most electricity in the middle hours of the day, when you’re likely to be out and about. This all seems very silly and out of sync, but there’s a clever bit of technology that can fix the problem.

If you add a solar battery into the mix, it will store the extra electricity produced by your panels that you aren’t at home to use. Then, during those mornings and evenings when you need power, your solar battery will keep you going until the sun comes back.

That’s right; your solar panels, your solar battery, and the sun all working together to keep your home powered for free.

A solar battery will work wonders for your energy bills. According to E.ON, with a 9.6 kWh solar battery storage system (and 12 x 315W panels) in central England, you could use up to 30% more of the energy your solar panels generate, and reduce your annual energy bills by up to £560.

People are getting smarter and catching on to the importance of solar batteries. For example, EnergySage’s Marketplace Intel Report in 2017 showed that 74% of people in the US who install solar panels are also interested in adding a home energy storage system. Meanwhile, in the UK, there are now almost 10,000 homes with solar batteries.

The cost of a solar battery generally ranges between £1,200 and £6,000, depending on the quality, capacity, and lifespan of the battery. Of course, the larger your solar battery, the more electricity you’ll be able to store, and the more money you’ll be able to save.

Can you still earn money with solar panels?

The Smart Export Guarantee (SEG) launched on 1st January 2020 to replace the old Feed-in Tariff. Check out our guide to the SEG here to find out how much you could earn.

The Feed-in Tariff ran from April 2010 to April 2019, and it was hugely successful. The scheme paid households for each kWh of electricity that they generated from solar panels, while also allowing homeowners to sell any of their unused electricity to the National Grid (known as the Export Tariff).

During the Feed-in Tariff’s nine-year existence, renewable energy capacity in the UK skyrocketed from 9.3 gigawatts to a mighty 38.9 gigawatts. Fortunately, anybody who signed up to the Feed-in Tariff before its conclusion will still receive payments for the full 20 years of their contract.

The Smart Export Guarantee

The Smart Export Guarantee launched on 1st January 2020, which requires all large energy providers (with at least 150,000 customers) to pay households for the renewable electricity they export back to the grid.

The tariffs being offered by most suppliers are very reasonable and similar to the export tariff rates previously being offered by the government. To find out more, check out our detailed guide to the the Smart Export Guarantee (SEG).

Additional solar panel costs

After you’ve thought about the solar panels and the solar battery, there are three additional costs you should consider.

Solar power inverter

The solar power inverter is a key part of any solar panel system, converting electricity from direct current (DC) to alternating current (AC) before it can be used in your home.

While solar panels can last up to 25 or 30 years, unfortunately, the inverter isn’t quite so hardy – it will generally need replacing after 10 or 15 years, the cost of which will set you back between £800 and £1,000.


The rainy weather in the UK isn’t always a bad thing. In drier countries, dust and dirt builds up on solar panels and needs washing off regularly, but frequent rainfall keeps the UK’s solar panels looking fresh.

You can also buy self-cleaning solar panels (covered with a hydrophobic coating) which stops water droplets from sticking to the surface.

However, bird droppings are a bigger problem, as they can significantly reduce a solar panel’s efficiency, and rainfall barely budges them. If you have a TV aerial located directly above your solar panels, this will inevitably become a perch for birds and invite a whole load of trouble.

It’s important that you have your solar panels cleaned fairly regularly (about once a year), and you can either pay the service or attempt it yourself. In the UK, the cost of having a 3-4kWp solar PV system properly cleaned is typically around £100.


Solar panels are reliable pieces of technology that aren’t prone to breaking, so finding the money to pay for repairs isn’t something you need to worry about too much. They don’t have any moving parts, and their surfaces are generally built to withstand hailstones the size of golfballs.

However, nothing’s invincible, and on rare occasions some solar panels fall prey to misfortunes like falling trees and stray cricket balls, or micro cracks caused by extreme weather, or perhaps your neighbourhood’s local family of squirrels suddenly develop an appetite for solar panel wires.

In the event of panel-busting mishaps, it’s good to know you can get things fixed. However, you should always hire a professional solar panel repair company to do it for you, as messing with electrical equipment is dangerous.

Depending on the extent of the damage to your solar panel, you should find that small breakages can be fixed from as little as £80, while large repairs will cost you up to £1,500.

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