How Much Do Solar Panels Cost for a UK Home in 2026?

These are typical fitted prices for UK homes in 2026, for straightforward pitched roofs with standard equipment:

• 3kW (about 7 panels): £5,000 to £6,500. Suits a smaller home or a roof with limited space.
• 4kW (about 9 to 10 panels): £6,000 to £8,000. The most common size for a three-bedroom home.
• 5kW (about 12 panels): £7,000 to £9,500. Suits larger homes or higher electricity use.
• 6kW (about 14 panels): £8,500 to £11,500. Suits four-bedroom homes, households with an electric car or a heat pump.

Panel counts assume modern panels of around 430 to 450 watts. Older or lower-wattage panels need more units for the same output, which uses more roof space.

Larger systems cost more in total but less per kW, because fixed costs such as scaffolding, the inverter, electrical work and certification are spread across more panels. That is why adding two or three extra panels at installation usually costs far less than the headline price per kW suggests.

The quickest way to judge a solar quote is to divide the total price by the system size in kW. Government cost data for MCS-registered home installations in 2025/26 puts the typical installed cost at roughly £1,550 to £1,950 per kW, with smaller systems at the higher end and systems of 4 to 10kW at the lower end.

Applied to real quotes:

• £6,800 for 4.3kW works out at about £1,580 per kW, which is in line with the market.
• £9,900 for 4.3kW works out at about £2,300 per kW. That is well above typical prices and needs a clear explanation.
• £4,200 for 4.3kW works out at under £1,000 per kW. Check what has been left out, because prices that low are rare for a complete installation.

A higher price per kW can be justified by a difficult roof, premium equipment, optimisers or a battery included in the price. Without one of those reasons, a quote far above £2,200 per kW for a simple roof is worth questioning.

This benchmark takes seconds and works on any quote, which makes it the single most useful number to know before an installer visits.

A fair price covers everything needed to install, connect and certify the system. Check that each quote lists:

• Panels: manufacturer, model, wattage and number. Common brands include Aiko, JA Solar, LONGi, Trina and DMEGC.
• Inverter: the make and model, such as SolarEdge, Solis, GivEnergy, Fox ESS or Enphase microinverters, and whether it is battery-ready.
• Mounting system: rails, roof hooks and any in-roof flashing kit.
• Scaffolding: erection, hire and removal.
• Electrical work: DC and AC cabling, isolators, the generation meter and connection to your consumer unit.
• Grid notification: the network operator notification or application.
• Certification: MCS certificate and electrical installation certificate.
• Monitoring: an app or portal showing generation.
• Warranties: panel product and performance warranties, inverter warranty and the installer's workmanship guarantee.

If any of these is missing or listed as an extra, add its cost before comparing quotes. MCS certification matters in particular, because it is needed to receive Smart Export Guarantee payments for electricity you export.

Several common extras can add hundreds or thousands of pounds to a quote. Some are worthwhile, some depend on your home, and some are optional:

• Bird protection mesh: often a few hundred pounds. Pigeons nest under panels in many areas, so it is often worth fitting at installation rather than later, when scaffolding would be needed again.
• Optimisers: help where part of the roof is shaded or panels face different directions, adding cost per panel. On an unshaded, single-direction roof they are rarely necessary.
• In-roof mounting: panels set into the roof rather than on top. Neater, and common on new builds or re-roofs, but usually more expensive.
• All-black panels: a cleaner look, often at a small premium.
• Consumer unit upgrade: older fuse boxes may need replacing to accept a solar connection.
• Extra scaffolding: needed for three-storey homes, conservatories or awkward access.
• Battery storage: the largest extra, typically adding £4,000 to £11,000 depending on size.

Ask each installer to price extras separately, so you can see the cost of the core system and decide which additions are worth having.

Your roof decides how easy the installation is, and that shows up directly in the price.

• Tiled roofs: concrete interlocking tiles are the most common and among the simplest to work on. Clay tiles and plain tiles take a little longer.
• Slate roofs: slates are brittle and need careful handling, so installation can take longer and cost more.
• Flat roofs: panels sit on angled frames, either ballasted or fixed, and the roof covering's condition matters.
• Height and access: taller homes, steep roofs and restricted access for scaffolding add cost.
• Multiple roof faces: splitting panels across east and west faces may need optimisers or a second inverter input.

Roof condition matters as much as type. Panels last 25 years or more, so if your roof will need work in the next few years, deal with it first. Removing and refitting panels later can cost a significant share of the original installation.

Orientation affects output rather than price. South-facing roofs generate most, but east and west-facing roofs produce worthwhile output too, spread across the morning and afternoon.

A 4kW system in the UK typically generates around 3,400 to 4,000 kWh a year, depending on location, orientation and shading. Southern England produces the most, while Scotland and northern England produce somewhat less.

Savings depend on how much of that electricity you use yourself. Under Ofgem's price cap from 1 October 2026, electricity costs an average of 26.32p per kWh. Every unit you generate and use at home saves that amount.

A household out at work during the day might use 30% to 40% of its solar output directly, while a household at home during the day, or one with an electric car charged in daylight, might use more. The rest is exported to the grid and earns an export payment through the Smart Export Guarantee, at a rate set by your chosen tariff.

As an illustration, a 4kW system generating 3,600 kWh, with 40% used at home, saves around £380 a year on electricity at the current cap rate. Export payments then add roughly £90 to £260 a year, depending on whether your tariff pays around 4p or 12p per kWh. You can see how output varies in your area on our solar panels by area pages.

For a typical home without a battery, payback usually falls somewhere between about 10 and 15 years, and the export tariff makes a bigger difference than most buyers expect.

Using the 4kW example above, at a fitted price of £7,000:

• With an export rate of around 12p per kWh: about £380 saved plus about £260 export income, roughly £640 a year, a payback of around 11 years.
• With an export rate of around 4p per kWh: about £380 saved plus about £90 export income, roughly £470 a year, a payback of around 15 years.

The same panels on the same roof can therefore take four years longer to pay back simply because of the export tariff chosen. Households that use more of their own electricity, by running appliances during the day or charging an electric car, see faster paybacks.

Panels typically carry performance warranties of 25 years or more, so even a 12-year payback leaves well over a decade of near-free electricity. Inverters usually need replacing once during that period, which is worth including in your sums.

A solar system comes with several separate warranties, and understanding them helps you compare quotes properly:

• Panel product warranty: covers manufacturing defects, often 12 to 25 years depending on the brand.
• Panel performance warranty: guarantees a minimum output over time, typically around 80% to 90% of original output after 25 to 30 years.
• Inverter warranty: often 10 to 12 years for string and hybrid inverters, sometimes extendable, and longer for some microinverters.
• Workmanship warranty: the installer's guarantee on the installation itself, such as roof fixings and wiring.

The workmanship warranty is the one most likely to matter and the one most likely to fail. If the installer stops trading, its own guarantee goes with it. Ask whether the workmanship warranty is insurance-backed, so it remains valid if the company closes.

Also ask who handles warranty claims. A manufacturer's warranty may cover a failed inverter, but the labour to remove and replace it may not be included. A good installer will explain how claims work and what you would pay, if anything.

Most home solar installations fall under permitted development, so they do not need planning permission. Exceptions can apply for listed buildings, homes in conservation areas or other designated areas, panels on walls facing a road, and some flat-roof installations. If any of these apply, check with your local planning authority before you commit.

Your installer also needs to tell the local network operator about the system. Smaller systems, with inverters up to 3.68kW on a typical single-phase home supply, connect under a simple notification process after installation.

Larger systems need prior approval, which can add several weeks. Many installers avoid this by fitting a larger array with an inverter or export limit set at 3.68kW. That way you can still install more panels than the limit suggests, use the extra output at home and keep the simpler process.

Ask each installer which process your system will use, who will handle it and whether any export limit has been applied. It affects both your timeline and how much you can export.

A few simple steps make a significant difference to what you pay:

1. Get three quotes from MCS-certified installers, so you can compare like for like.
2. Divide each price by the system size to get the price per kW, and question anything far above £2,200 per kW on a simple roof.
3. Check what is included, especially scaffolding, bird mesh, monitoring and the grid notification.
4. Compare named equipment, including panel and inverter models and their warranties.
5. Ask about the workmanship warranty, and whether it is insurance-backed.
6. Never pay a large deposit upfront. Reputable installers usually ask for a modest deposit, with the balance due after installation.
7. Ignore pressure to sign on the day. Limited-time discounts are a common sales tactic.

Our home solar page explains the main system options, including solar with battery storage. When you are ready, compare quotes from up to three MCS-certified installers in your area, free and with no obligation.