A typical 4 kW solar panel system in the UK costs between £5,500 and £8,000 fully installed including VAT (which is currently 0% for residential properties until 31 March 2027).
£6,500. That's what a typical 4kW system costs in 2026, fitted and ready to go, with the 0% VAT already knocked off. See our guide on 10kW solar system 2026 for more detail. See our guide on 4 bed house solar installation for more detail. See our guide on 4kW solar panel system 2026 for more detail. Two years ago the same system would have cost you nearly £8,000. See our guide on DIY solar panels for more detail. Prices dropped sharply through 2022 to 2024 as panel supply caught up with post-energy-crisis demand, and they've largely stabilised since.
If you're here, you want a number. So here it is: most UK households pay between £5,000 and £9,000 for a solar panel system, depending on size. That includes panels, inverter, mounting, scaffolding, labour and the DNO notification to your local grid operator. It does not include battery storage, bird proofing or any roof repairs you might need first. We'll break all of that down.
What You'll Actually Pay
This is the table you came for. Costs are based on current MCS installer data and Energy Saving Trust figures, and already reflect the 0% VAT that applies to all residential solar installations until 31 March 2027.
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System Size
Panels Needed
Typical Cost (0% VAT)
Common questions
Frequently asked questions
How much do solar panels cost for a 3-bed house?
Most 3-bed semis suit a 4kW system, which costs £5,500 to £8,000 fully installed with 0% VAT. The exact price depends on your roof type, location and which panels your installer uses. Get three quotes from MCS-certified installers and you'll see the range for your specific house. If you're on qualifying benefits, ECO4 could fund the whole thing.
Do solar panels add value to your home?
Yes, though it's hard to put an exact figure on it. Research from the Department of Energy and Climate Change found that energy efficiency improvements can add up to 14% to a property's value, and solar panels improve your EPC rating by 5 to 15 SAP points. Estate agents report that buyers increasingly ask about solar and energy costs. The bigger financial benefit is the 15 to 20 years of savings after payback.
How long do solar panels take to install?
One to two days for a typical residential system. Scaffolding goes up, panels are mounted and wired, the inverter is connected, and everything is tested. Your installer handles the DNO notification paperwork. After that, you get your MCS certificate and can register for the Smart Export Guarantee. The whole process from signing the contract to generating electricity is usually two to four weeks.
Check if you qualify
Answer a few quick questions to see which government energy grants you're eligible for. Free, instant results.
Prices assume standard 400W monocrystalline panels with a string inverter. Premium all-black panels or micro-inverter setups add 10% to 20%. Output figures are for central England with a south-facing roof, based on Met Office solar irradiance averages.
A 4kW system is the sweet spot for most three-bedroom houses. It covers roughly 30% to 40% of average household electricity consumption and fits comfortably on a standard roof. If your usage is higher, say you work from home or run an electric car charger, stepping up to 5kW or 6kW makes the maths work better.
What's Included in the Price
Every quote from an MCS-certified installer should cover:
Solar panels (typically 10 to 12 for a 4kW system)
A string inverter or micro-inverters
Roof mounting rails and fixings
Scaffolding
All electrical work and consumer unit upgrades
DNO notification (telling your local grid operator you're generating)
MCS certification paperwork (you need this for SEG registration)
What's not included, and catches people out:
Battery storage (£3,000 to £7,000 extra, covered below)
Bird proofing mesh (£300 to £500, stops pigeons nesting under panels)
Roof repairs (if your roof needs work, do it before the panels go on, not after)
Asbestos removal (older properties with cement fibre roofing may need a survey)
If a quote doesn't itemise scaffolding or the DNO notification, ask. Some installers treat these as extras.
What Affects the Price
Two identical houses on the same street can get quotes £2,000 apart. Here's why.
Roof Type
A south-facing pitched roof with standard concrete tiles is the cheapest to install on. Flat roofs need angled mounting frames, adding £300 to £600. Slate and clay tiles require specialist fixings. If your roof faces east or west, you'll generate about 80% of what a south-facing system produces, per Energy Saving Trust data. Still worth doing, but your payback period stretches by a year or two.
North-facing? Most installers will advise against it. The output drop is too steep to justify the cost.
Location
Southern England gets 10% to 15% more sunlight than Scotland, according to Met Office data. A 4kW system in Cornwall generates roughly 4,000 kWh a year. The same system in Edinburgh produces closer to 3,200 kWh. Labour costs vary too. London and the South East run higher. Installers in the Midlands and North tend to be cheaper.
Panel Brand and Inverter
Premium brands like SunPower come with 25-year performance warranties and higher efficiency ratings. Budget brands from Trina or JA Solar carry 12 to 15-year product warranties and perform well in UK conditions. The real-world difference in output is smaller than the marketing suggests, typically 5% to 8%.
The inverter matters more than most people realise. A string inverter costs less but means one shaded panel drags down the whole array. Micro-inverters let each panel work independently, better for partially shaded roofs, but add £500 to £1,000 to the total. Ask your installer which setup suits your roof.
Getting Quotes
Always get at least three quotes from MCS-certified installers. Price differences of 20% to 30% between quotes for the same system are common. Check that every quote includes MCS certification, scaffolding, the inverter and DNO paperwork. A 25-year panel warranty means nothing if the inverter only lasts 10 years, so ask about inverter warranties separately.
Group-buying schemes run by local councils can cut costs by 10% to 15% through bulk purchasing. Your local authority website is the best place to check for current schemes.
Should I Add a Battery?
£3,000 to £7,000. That's the additional cost of a home battery, on top of your panel installation. A typical 5kWh unit costs £3,000 to £5,000. Larger 10kWh systems run £5,000 to £7,000. Popular models include the Tesla Powerwall, GivEnergy All-in-One and the Fox ESS range. Batteries also qualify for the 0% VAT relief. For a full comparison of models, capacity options and whether storage makes financial sense for your usage pattern, see our dedicated guide to solar battery storage.
The honest answer on whether it's worth it depends on one thing: when you use electricity.
If you're out all day and export most of your solar generation to the grid at 12p to 15p per kWh, then use grid electricity in the evening at 24p per kWh, a battery saves you the difference on every stored unit. That adds up to £200 to £400 a year for a typical household, which means the battery pays for itself in 8 to 15 years.
If you're home during the day and already use most of your generation directly, a battery saves you less because you're already avoiding grid imports. The financial case is weaker.
One scenario where batteries make clear sense: time-of-use tariffs. If you're on a tariff like Octopus Agile, you can charge the battery from the grid overnight at 7p to 10p per kWh and use that stored electricity during peak hours at 30p or more. That's a saving even without solar panels.
Our view: if your budget is tight, spend the money on a bigger panel array first. You'll generate more electricity overall. Add the battery later when prices drop further or when your usage pattern changes.
Grants and VAT Relief
Three things can reduce what you pay. We've covered these in detail in our solar panel grants guide, so here's the short version.
0% VAT applies automatically to all residential solar installations until 31 March 2027, per GOV.UK. Your installer charges you less. No forms, no application. On a £6,500 system, that's roughly £1,100 you're not paying compared to the standard 20% rate.
ECO4 can fund the entire installation if you're on qualifying benefits (Universal Credit, Pension Credit and others) and your home has an EPC rating of D or below. Fully funded means £0 out of pocket. About a third of UK households meet the income criteria, per GOV.UK. Most never check.
Smart Export Guarantee pays you for surplus electricity you send to the grid. Not a grant, but it chips away at your payback every year. Octopus pays 15p per kWh. British Gas pays 12p. You register after installation through your chosen supplier, per Ofgem rules.
One common confusion: the Boiler Upgrade Scheme (BUS) gives £7,500 towards heat pumps, not solar panels. You can't use it for a panel installation on its own. But if you're getting a heat pump under BUS, adding solar to the project makes the combined economics much stronger because the panels generate electricity to run the pump.
For the full breakdown of every scheme, eligibility rules and how to claim, see our solar panel grants guide.
Is It Worth It? The Actual Maths
Let's run the numbers on a typical installation. No hand-waving, just arithmetic.
The setup:
4kW system, south-facing roof, central England
System cost: £6,500 (after 0% VAT)
Annual generation: 3,600 kWh
Self-consumption: 40% (1,440 kWh used directly)
Export: 60% (2,160 kWh sold via SEG)
Annual savings:
Electricity avoided: 1,440 kWh x 24.5p (current Ofgem cap rate) = £353
SEG income: 2,160 kWh x 12p (mid-range tariff) = £259
Total annual benefit: £612
Payback period: £6,500 / £612 = 10.6 years
Now make it better. Shift your washing machine, dishwasher and car charger to daytime running and push self-consumption to 60%.
Electricity avoided: 2,160 kWh x 24.5p = £529
SEG income: 1,440 kWh x 12p = £173
Total annual benefit: £702
Payback period: £6,500 / £702 = 9.3 years
Add a battery and you could push self-consumption above 80%, but the battery cost (£3,000 to £5,000) extends the combined payback. The sweet spot for most households is maximising daytime usage without a battery first.
After payback, the system generates pure savings for another 15 to 20 years. Panels typically last 25 to 30 years with roughly 0.5% degradation per year, so year-25 output is still about 88% of year-1. Over the full lifetime, a £6,500 system could save you £10,000 to £15,000 in today's money, more if electricity prices rise.
Are Solar Panels Getting Cheaper?
Prices dropped significantly between 2022 and 2024. Global panel manufacturing capacity surged, supply chains recovered from Covid disruption, and UK demand stabilised after the 2022 energy price spike. A 4kW system that cost £7,500 to £8,000 in early 2023 now costs £5,500 to £8,000, with most quotes landing around £6,500.
Since mid-2024, prices have flattened. The big drops are behind us. Waiting another year for a cheaper deal means losing a year of savings and SEG income, which at £600 to £700 a year is probably more than any further price reduction.
The 0% VAT is guaranteed until 31 March 2027. After that, the government hasn't confirmed whether it will continue. If it reverts to 20%, a £6,500 system would cost closer to £7,800. That's another reason not to wait.
What Happens During Installation
Most residential installations take one to two days. Here's the typical process.
Day one: scaffolding goes up, mounting rails are fixed to the roof, panels are fitted and wired. Day two (if needed): inverter installation, electrical connections, consumer unit upgrade and testing. Some smaller systems complete in a single day.
Your installer handles the DNO notification, which tells your local distribution network operator that you're generating electricity. This is a legal requirement but it's just paperwork, no approval needed for systems under 3.68kW (single phase). Larger systems need formal approval, which can take a few weeks.
After installation, your installer issues the MCS certificate. You need this to register for the Smart Export Guarantee. Most installers also handle the SEG registration for you, but check.
Your EPC rating will improve with solar panels fitted, typically by 5 to 15 SAP points depending on system size and your roof orientation.
Next Steps
You know the costs. You know the payback. The variable is your roof, your usage and which grants you qualify for.
Open the eligibility checker. Two minutes. You'll see which schemes apply to your household and get matched with MCS-certified installers in your area.