Solar Panels Cost UK: What to Expect in 2026

The average UK home solar panel installation costs around £7,600 for a 4.5kWp system, according to the Energy Saving Trust's July 2026 figures. That price includes panels, inverter, mounting hardware, and labour. At current electricity prices and with Smart Export Guarantee (SEG) export income, payback runs roughly 9 to 12 years depending on where you are in the country and how much electricity you use during the day.

This page breaks down what drives the price, what the 0% VAT deal actually covers, how SEG works, and what government support exists (spoiler: there is no universal UK solar grant, but there are targeted schemes worth knowing about).

What does a solar panel system cost in the UK?

The Energy Saving Trust, which publishes cost benchmarks verified against industry installer data, puts the typical system at 4.5kWp costing around £7,600 (figures updated 15 July 2026). That covers a roof installation for an average three- or four-bedroom house with decent south-facing roof space.

System size is the biggest cost driver. Larger systems cost more to buy but generate more electricity, so the right size depends on your roof space, your daytime usage pattern, and your budget. The table below gives a rough sense of the cost range, and our guide to solar panel cost by system size breaks down panel counts, roof space and payback for each size from 3kW to 6kW. If you are not sure which size fits your home, work it out from your bill first with our guide to how many solar panels you need, then check what will physically fit with our guide to solar panel dimensions.

The 4.5kWp figure is the Energy Saving Trust's UK-wide benchmark, which it raised to around £7,600 on 15 July 2026 and which averages in difficult roofs, restricted access and scaffolding. The other size ranges are indicative quote ranges for a straightforward install, so a well-priced quote can sit below the EST average for the same size. Output estimates use roughly 800 to 900 kWh per kWp a year as a typical UK figure; the MCS irradiance tables range from about 736 kWh/kWp in Lerwick to 1,130 in Brighton for a south-facing 35 degree roof. Actual output depends on orientation, pitch, shading and location. Sources: MCS MIS 3002 standard; Energy Saving Trust.

Does the 0% VAT apply to solar panels?

Yes: supply-and-install of solar panels currently attracts 0% VAT, not the standard 20%. This zero rate covers the installation of energy-saving materials, including solar PV panels, inverters, and battery storage, in residential accommodation. It is confirmed to run until 31 March 2027, after which it reverts to the 5% reduced rate (not 20% as some older content states). Source: gov.uk VAT Notice 708/6.

If you are getting quotes before 31 March 2027, the price you receive should already show 0% VAT. From 1 April 2027, expect quotes to include 5% VAT on the supply-and-install element. Supply-only purchases (buying panels without a certified installation) are standard-rated at 20%. That is why a self-installed kit carries full VAT, as our guide to plug-in solar panels explains. The deadline, the buildings that qualify and what the change is actually worth are covered in detail in our guide to 0% VAT on solar panels.

What drives the price of a solar installation?

Beyond system size, a few factors push quotes up or down.

Roof type and complexity. A straightforward pitched roof with south-facing aspect and no shading is the cheapest install. Flat roofs need ballasted mounting frames. East-west split systems on a hipped roof involve more labour and two inverter strings. Listed buildings or conservation areas may need planning permission, which adds time and cost.

Panel quality and inverter choice. Budget panels and string inverters are cheaper upfront. Higher-efficiency panels from manufacturers with longer power warranties generate slightly more electricity per square metre, which matters if your roof space is limited. Microinverters or power optimisers add cost but reduce the impact of partial shading. Our guide to solar inverters works through which setup suits which roof, and why the inverter rating decides your grid paperwork.

Battery storage. Adding a battery roughly doubles the upfront cost relative to panels alone. The Energy Saving Trust puts battery storage at an additional £5,000 to £8,000 on top of the panels. The 0% VAT zero rate also covers battery storage installed alongside or retrofitted to a solar system until 31 March 2027. Whether a battery makes sense financially depends on how much surplus power you currently export versus how much you buy back in the evenings.

Location and scaffolding. Urban areas with good installer competition tend to see keener pricing. Very rural locations may add a travel or call-out cost. Multi-storey homes with complex access can push scaffold costs up.

G98 versus G99 connection. Most domestic systems are designed to stay within 3.68kW per phase, which means the installer can commission first and notify the Distribution Network Operator (DNO) within 28 days (the EREC G98 process). Systems above 3.68kW per phase need prior DNO approval before connecting (EREC G99), which can add weeks to the project. Your installer handles this paperwork. Full detail, including the fast-track route and the separate Northern Ireland process, is in our guide to G98 and G99 grid connection. Source: Energy Networks Association.

The Smart Export Guarantee: what you earn for power you don't use

The Smart Export Guarantee (SEG) pays you for every unit of solar electricity you export to the grid. It replaced the old Feed-in Tariff (FiT) for new applicants. The FiT closed to new applicants in March 2019 and is no longer available to new solar installations. The SEG launched on 1 January 2020.

SEG rates are set by each supplier, not the government. Larger suppliers (those with 150,000 or more domestic electricity customers) are legally required to offer a SEG tariff; smaller suppliers do so voluntarily. Rates must be above zero but are otherwise market-determined, so they vary and move frequently. See Ofgem's SEG framework for how the scheme works. For a working figure, the Energy Saving Trust says: "Typically, you'll get around 12p for every unit that you don't use yourself through the Smart Export Guarantee."

Most homes export roughly a third to half of what their panels generate, depending on daytime usage. Around 12p/kWh is a reasonable working figure, though your actual tariff may be higher or lower. Do not use the FiT rate from an old quote or a neighbour's existing system as your benchmark.

To register for SEG, your installer needs to be MCS-certified and your system needs an MCS certificate. Most suppliers will ask for this certificate when you apply for a tariff. You don't legally need MCS certification to have panels installed, but without it you won't qualify for SEG or any grant scheme, so in practice always use an MCS-certified installer (check the register at mcscertified.com).

Payback period: how long before solar pays for itself?

At current electricity prices and with SEG export income, the Energy Saving Trust calculates payback at roughly 9 to 12 years for a typical UK installation (July 2026 figures). EST gives payback for four locations: London around 9 years, Aberystwyth 9 to 10 years, Manchester 10 to 11 years and Stirling 11 to 12 years, reflecting the yield difference between the south of England and Scotland.

The single biggest driver of payback speed is self-consumption (the proportion of solar output you use directly rather than exporting). Electricity you consume yourself displaces grid electricity at the full unit rate; electricity you export earns the SEG rate. At current grid prices, consuming solar directly is worth more than exporting it. Households that run dishwashers, washing machines, and other high-load appliances during daylight hours see faster payback than those who are out all day.

A battery can improve self-consumption by storing surplus daytime generation for use in the evening, but at current battery prices the payback on a system with battery tends to be longer than on a panel-only system, all else being equal. Whether the combined system makes sense financially depends on your usage profile and how long you plan to stay in the home.

If you expect to move before the system pays for itself, the resale question matters as much as the payback figure. Peer-reviewed research on around five million UK listings found a sale price premium for homes with solar, though the evidence comes with real caveats and a roof lease can work against you. Our guide to whether solar panels add value to your house sets out what the studies actually measured.

Is there a grant for solar panels in the UK?

There is no universal UK grant that pays every homeowner toward a solar installation. This is the single most common piece of wrong information circulating about UK solar. The situation is more targeted:

Warm Homes Plan. Launched in January 2026, the government's ~£15 billion Warm Homes Plan includes fully funded solar panel installations for low-income households. In England, the Warm Homes: Local Grant already funds free improvements, which can include solar panels, for privately owned homes rated EPC D to G where household income is usually £36,000 or less (or in certain postcode areas or benefit households). Apply via gov.uk. The Energy Saving Trust describes it as covering "solar panels, batteries, heat pumps and insulation" for eligible low-income homes, with low and zero-interest loans available for other homeowners. Source: gov.uk Warm Homes Plan.

ECO4. The Energy Company Obligation scheme (ECO4) provides funding for insulation and heating measures for fuel-poor and low-income households. It runs until 31 December 2026 and is administered through energy suppliers. Solar PV is within scope for ECO4 in some cases. Source: ofgem.gov.uk.

Great British Insulation Scheme (GBIS). This scheme ended on 31 March 2026. It is no longer accepting new applications.

Home Energy Scotland. If you own a home in Scotland, the Home Energy Scotland grant and loan scheme provides heat pump and insulation funding, but it does not currently offer a grant for standalone solar PV. Solar PV-T hybrid systems can access a loan. Heat pump funding is separate and substantial (up to £7,500 grant plus a £7,500 optional interest-free loan). Source: homeenergyscotland.org.

We break down every scheme, nation by nation, in our full guide to solar panel grants in the UK. For most people (those who do not qualify for low-income or benefit-linked schemes) the primary financial support for solar right now is the 0% VAT rate until March 2027 and the ongoing Smart Export Guarantee income. Both are real and worth factoring in; just don't plan your budget around a grant that doesn't exist for your situation.

Permitted development: do you need planning permission?

In England, rooftop solar usually falls under permitted development, so you do not need to apply for planning permission, provided the installation meets the conditions set out on planningportal.co.uk. The rules were updated on 27 August 2026, with a transition to 27 August 2027 during which the previous rules can still be followed. Key limits: panels on a pitched roof must not project more than 200mm from the slope or sit above the highest part of the roof (excluding chimney); on a house, wall-mounted panels can project up to 0.4m, or 0.2m on a wall abutting a highway; on a flat roof the equipment cannot sit more than 600mm above the highest part of the roof. You cannot install under permitted development in the grounds of a listed building or on a scheduled monument, and in a conservation area or World Heritage Site panels must not be fitted to a wall (or, on a house, a balcony or roof enclosure) which fronts a highway.

Rules differ by nation. Scotland, Wales and Northern Ireland each have their own permitted development regimes. Do not assume England's rules apply elsewhere. Check the relevant national planning authority if your home is in Scotland, Wales or Northern Ireland.

If your home is a leasehold flat, you will likely need the freeholder's permission regardless of permitted development rules.

How to compare solar quotes

When you receive installer quotes, a few things are worth checking beyond the headline price.

Is the installer MCS-certified? Verify at mcscertified.com before signing anything. MCS certification is what qualifies your installation for SEG payments and any applicable grant scheme. Also check they hold RECC or HIES consumer-code membership, which gives you access to an independent dispute resolution service if something goes wrong.

Are the quotes on the same system size? A quote for a 3.5kWp system is not comparable to one for a 5kWp system. Ask each installer to quote on the same kWp size, or ask them to justify why they've sized the system differently.

What does the warranty cover? Panels typically carry a 25-year power output warranty. Inverter warranties are usually at least five years and can often be extended to as much as 15 years; expect to replace the inverter after around 12 years. Check what the installer's workmanship warranty covers and for how long.

Is scaffolding included? Some quotes exclude scaffold costs. Clarify upfront so you are comparing like for like.

What is the projected SEG income based on? Be cautious of quotes using very high export rate assumptions. A 12p/kWh flat rate is a reasonable working figure at current market rates; if a quote projects 20p+ throughout a 25-year analysis, ask where that figure comes from.