“How much do solar panels cost?” is the first question almost everyone asks, and the honest answer is: it depends. What it depends on is not a mystery, though, and once you understand the handful of things that move the price, you can judge any quote with confidence.
This guide gives real, indicative 2026 UK prices by system size, explains what you are actually paying for, and shows you how to spot a quote that is too cheap to be true. It is written by Cre8 Zero, an MCS-certified solar, battery and EV charging installer based in Brighton and serving Sussex, Kent, Surrey, Hampshire and Brighton & Hove.
The short answer: 2026 solar prices by system size
Most UK homes need a system somewhere between 3kW and 6kW. As a rule of thumb, expect to pay in these ranges for a fully installed, MCS-certified system. These are indicative figures, and your exact price depends on the factors we cover below.
| System size | Typical panels | Indicative installed cost | Indicative annual generation | Best suited to |
|---|---|---|---|---|
| 3kW | 6 to 8 | £6,500 to £8,500 | 2,550 to 3,000 units | Smaller homes, lower usage |
| 4kW | 8 to 11 | £8,500 to £11,000 | 3,400 to 4,000 units | Typical 3 to 4 bed homes |
| 6kW | 12 to 16 | £11,000 to £13,000 | 5,100 to 6,000 units | Larger homes, higher usage |
| 8kW+ | 16+ | £13,000 to £16,000+ | 6,800 units and up | Big homes, EVs, heat pumps |
Adding battery storage typically costs a further £3,000 to £6,000 or more, depending on capacity. All of the above assume installation by a certified company using quality components.
Key takeaway: most homeowners land on a 4kW to 6kW system, costing roughly £6,000 to £12,000 installed in 2026.
What actually drives the cost?
Two identical-looking homes can receive different quotes for good reasons. Here is where the money goes.
- The panels: more efficient or premium-brand panels cost more but generate more from the same roof space. Cheap unbranded panels can drag down long-term performance.
- The inverter: this converts your solar into usable electricity. String inverters are cheaper, while optimisers or microinverters cost more but handle shading and complex roofs better.
- Scaffolding and access: a simple two-storey roof is quick to reach. Awkward access, three storeys or restricted parking add labour and scaffolding cost.
- Roof type: standard tiles are straightforward. Slate, flat roofs and older or fragile coverings take longer and need more care.
- Battery storage: the single biggest optional add-on, and worth its own decision (more below).
- System complexity: multiple roof faces, bird protection, or an EV charger tied into the same install all affect the final figure.
The cost per kWp trick for comparing quotes
If you want one number to compare quotes fairly, use cost per kWp (kilowatt-peak, a measure of system capacity). Divide the total price by the system size in kW.
In 2026, residential systems typically work out at roughly £1,400 to £2,200 per kWp installed. Smaller systems sit at the higher end because fixed costs like scaffolding are spread over fewer panels, while larger systems benefit from economies of scale.
This lets you compare a 3kW quote against a 6kW quote on equal terms. If one quote comes in far below that range, be curious about why, because something has usually been left out or downgraded.
The 0% VAT saving, while it lasts
Here is a genuine, time-limited saving. In Great Britain, solar panels and battery storage installed on homes carry 0% VAT, and that relief runs until 31 March 2027. After that date it is expected to rise to at least 5%.
The prices in this guide already assume the 0% rate, and your installer applies it automatically on the invoice. On a typical install it is worth several hundred pounds, so 2026 is a sensible year to act while the relief is in place. Eligibility can vary by property, and a qualified adviser can confirm your position if you are unsure.
What will you save, and how fast does it pay back?
Savings come from using your own solar electricity instead of buying it, plus income from exporting your surplus through the Smart Export Guarantee.
As an indicative guide, many households save between £400 and £900 a year, with larger systems and higher self-consumption pushing that higher. Those savings grow as grid prices rise, and the Ofgem price cap increased again in July 2026.
Payback periods in 2026 typically fall in the region of 7 to 12 years, improving where you use more of your own generation and as electricity prices climb. After payback, the electricity your system produces is effectively free for the rest of its 25-year-plus life.
Key takeaway: think of solar as a long-term asset. The upfront cost buys decades of cheaper, more predictable energy.
Want a precise figure for your home rather than a range? Book a free energy assessment and we will design a system around your roof and usage.
Should you add a battery?
A battery is the most common upgrade, and whether it pays depends on your habits.
Storing daytime solar to use in the evening means you buy less expensive peak-time grid electricity. For homes that are empty during the day, a battery can transform how much of your own solar you actually use. Batteries also carry 0% VAT until 31 March 2027 and pair well with time-of-use export tariffs that pay more at peak.
The trade-off is the upfront cost of £3,000 to £6,000 or more, which lengthens payback somewhat. A good installer models both options so you can see the difference before deciding, rather than adding a battery by default.
Red flags in a cheap solar quote
A low price is not a bargain if the system underperforms or the company disappears. Watch for these warning signs:
- No MCS certification. This is required for the Smart Export Guarantee and the 0% VAT relief. No MCS means no export income and potentially no VAT saving.
- Vague, non-itemised quotes. You should see the panels, inverter, battery and labour listed clearly, not a single lump sum.
- Unbranded or unnamed components. If the quote will not tell you the make and model of panels and inverter, be cautious.
- No workmanship warranty. Quality installers back their labour with an insurance-backed workmanship warranty, not just the manufacturer’s product warranty.
- Pressure selling. “Today only” discounts and rushed decisions are a classic warning sign. A fair price is a fair price next week too.
- No proper survey. A serious quote follows a look at your actual roof, not just a postcode and a phone call.
At Cre8 Zero, every installation is MCS-certified, carried out by fully qualified electricians, and backed by an insurance-backed workmanship warranty. Our 5-star ratings on Trustpilot and Google reflect the standard we hold ourselves to.
A worked example
Take a typical four-bedroom home fitting a 4kW system for, say, £7,500 including the 0% VAT saving. That works out at around £1,875 per kWp, which sits comfortably in the normal range.
If that household saves roughly £700 a year through lower bills and modest export income, the system pays for itself in a little over ten years, then continues to generate for another 15 years or more. Add a battery and higher self-consumption, and the annual saving can rise, though so does the upfront cost. Every home is different, which is why a tailored quote beats any average.
Frequently asked questions
How much do solar panels cost in the UK in 2026? A typical home solar system costs roughly £6,000 to £8,500 for a 4kW setup, with smaller 3kW systems from around £5,000 and larger 6kW systems up to about £12,000. Battery storage adds roughly £3,000 to £6,000. All figures are indicative and depend on your roof and usage.
How much does a 4kW solar system cost in 2026? A 4kW system, suitable for a typical three or four-bedroom home, costs in the region of £6,000 to £8,500 fully installed by an MCS-certified company, including the current 0% VAT relief. The exact price depends on roof access, components and whether you add a battery.
How much does a 6kW solar system cost in 2026? A 6kW system typically costs around £8,500 to £12,000 installed in 2026. It suits larger homes or households with higher electricity use, including those with an electric vehicle or heat pump. Battery storage is an optional extra on top.
Is there still 0% VAT on solar panels in 2026? Yes. Solar panels and battery storage installed on homes in Great Britain carry 0% VAT until 31 March 2027, after which the rate is expected to rise to at least 5%. Installers apply the relief automatically.
How long do solar panels take to pay for themselves? In 2026, most home solar systems pay back in roughly 7 to 12 years, depending on system size, how much of your own electricity you use, and grid prices. After payback, the electricity produced is effectively free for the rest of the system’s 25-year-plus life.
Why are some solar quotes so much cheaper than others? Very low quotes often leave out MCS certification, use unbranded components, skip a proper survey, or omit a workmanship warranty. Comparing quotes on cost per kWp, roughly £1,400 to £2,200 in 2026, helps you spot one that is too cheap to be sound.
Get an accurate price for your home solar panel installation
Ranges are useful for planning, but the only way to know your real cost is a proper look at your roof and your usage. That is exactly what we provide, with no obligation and no pressure.
Let our MCS-certified team give you a clear, itemised quote you can trust. Book your free energy assessment online, call us on (020) 3038 4595, or email enquiries@cre8zero.com.
