How Much Do Solar Panels Cost in the UK?
A 4kWp solar panel system costs between £6,000 and £8,000 installed in 2026. Most homes break even within 8 to 10 years. After that, the system generates free electricity for another 15 to 20 years.
What does a typical solar installation cost?
Most UK homes install between 3kWp and 6kWp. Current installed price ranges in 2026:
- 3kWp: £5,000 to £6,500
- 4kWp: £6,000 to £8,000
- 5kWp: £7,000 to £9,500
- 6kWp: £8,500 to £11,000
These figures include panels, inverter, mounting hardware, installation labour, scaffolding, and connection to your consumer unit. Battery storage is a separate cost.
Prices vary by roof type, access, and system specification. A south-facing pitched roof with easy access comes in at the lower end. A complex roof, multiple aspects, or flat roof installation costs more.
What are you actually paying for?
The panels are typically 20 to 30% of the total cost. The rest is the inverter, mounting system, labour, and installation infrastructure.
Panels
Quality matters here. Panels from reputable manufacturers carry 25-year performance guarantees. Cheaper panels degrade faster. Over a 25-year lifespan, a panel degrading at 0.5% per year rather than 0.3% per year makes a meaningful difference to total generation and financial return.
Inverter
This converts DC electricity from the panels into AC electricity your home uses. A string inverter is standard for a straightforward roof. Optimisers or microinverters are worth considering where shading or multiple roof aspects are involved. They cost more but recover generation a standard string inverter would lose.
Mounting
Roof type affects this significantly. Standard interlocking tiles are straightforward. Slate, clay tile, flat roof, and standing seam metal all require different solutions and add cost.
Labour and scaffolding
A detached house with standard pitched roof and clear access is typically a one-day installation. Restricted access, terraced properties, or specialist scaffolding requirements add time and cost.
Does system size affect cost per kWp?
Yes. Larger systems have a lower cost per kWp because the fixed costs, scaffolding, inverter, connection, spread across more panels.
A 3kWp system might cost around £2,100 per kWp. A 6kWp system on the same roof might come in at around £1,700 per kWp. If your roof has the space, going larger often makes better financial sense.
My view on this: most homeowners undersize their first installation. If you are planning to add a heat pump or an EV charger in the next few years, size for that future demand now. Retrofitting extra panels later costs more per kWp than getting it right first time.
Should you add battery storage?
A battery typically adds £2,500 to £5,000 to the cost depending on capacity. A SigEnergy or Tesla Powerwall 3 with 10kWh of storage is the most common specification for a family home.
Without a battery, surplus generation during the day is exported to the grid at 5 to 15p per kWh under the Smart Export Guarantee (SEG). You then buy electricity back at 24 to 30p per kWh in the evening. A battery closes that gap by storing what you generate and using it later.
For homes with a heat pump or an EV, a battery is nearly always worth including. For a smaller household with low evening consumption, the payback period is longer and the case is less clear-cut. I will give you a specific recommendation based on your usage at survey stage.
What affects your payback period?
For a typical 4kWp system at £7,000, generating around 3,400 to 3,800 kWh per year in the UK, the payback period with current electricity prices is around 8 to 10 years. After that, the system generates free electricity for its remaining lifespan of 20 to 25 years.
Factors that shorten the payback period: high daytime electricity consumption, south-facing roof, battery storage that reduces evening imports, SEG registration, and an EV or heat pump that can be scheduled to run during generation hours.
Factors that lengthen it: north-facing or heavily shaded roof, low household consumption, small system relative to demand.
Want to learn more?
Book a free survey with AES and our engineers will give you a generation estimate, a payback calculation, and a system specification before you commit to anything.
FAQs
Are solar panels worth it in 2026?
For most homes with a suitable south or south-west facing roof, yes. With current electricity prices and SEG income, payback periods are typically 8 to 10 years on a well-specified system. The system then generates free electricity for another 15 to 20 years.
Do solar panels add value to your home?
Generally yes. A well-specified, MCS-certified installation with a good EPC rating typically adds value and makes a property more attractive to buyers. A poorly specified or uncertified installation can cause complications at sale.
Is there VAT on solar panels?
Solar panel installations in the UK currently attract 0% VAT for residential properties. This applies to panels, inverters, batteries, and installation.
How many solar panels do I need?
It depends on your roof space, orientation, and electricity demand. A typical family home installs 10 to 16 panels depending on panel wattage and available roof area. AES calculates this at survey stage based on your actual usage and roof characteristics.
Can I get a grant for solar panels?
There is no direct government grant for solar panels in 2026, though 0% VAT applies. If you are also considering a heat pump, the Boiler Upgrade Scheme (BUS) provides a £7,500 grant, and combining solar with a heat pump significantly improves the financial case for both.
