Typical UK solar panel cost by system size
Most domestic systems are quoted as installed packages. That means panels, inverter, roof mounting, cabling, electrical work, scaffolding, commissioning and paperwork are usually included. Batteries, bird protection, complex scaffolding and consumer unit upgrades may be separate.
The table below is a practical starting point for a straightforward roof. It should not be treated as a guarantee. A small terrace with awkward access can cost more than a larger detached roof with easy scaffolding.
| System size | Typical home fit | Estimated installed cost | Common quote risk |
|---|---|---|---|
| 3kW | Small terrace or low usage home | GBP 5,000 to GBP 7,000 | Limited roof space |
| 4kW | Typical 2 to 3 bedroom home | GBP 6,000 to GBP 8,500 | Inverter and access differences |
| 5kW | Higher usage family home | GBP 7,500 to GBP 10,500 | Export and battery sizing |
| 6kW | Larger roof or high electricity use | GBP 9,000 to GBP 12,500 | DNO and roof layout checks |
What changes the price
Solar pricing in the UK is usually driven by system size, roof access, inverter choice, scaffolding, battery specification and the amount of electrical work needed around the consumer unit. The headline panel price is only one part of the quote.
A useful quote separates equipment, labour, access, commissioning and optional extras. If those items are bundled into one round number, ask for the breakdown before comparing it with another installer.
- Roof complexity: multiple roof faces, dormers, fragile tiles and steep pitch increase labour time.
- Scaffolding: access over conservatories, extensions or narrow side returns can add a meaningful cost.
- Inverter specification: hybrid inverters cost more but can make battery upgrades cleaner later.
- Battery storage: a battery can improve self-consumption, but it should be sized against usage patterns.
- Electrical upgrades: older consumer units or long cable runs can make a simple job less simple.
Property type examples
A terraced house often needs a compact system with careful panel layout. The job can still work well, but roof access and shading from neighbouring rooflines deserve a proper look.
Semi-detached homes are often good candidates because the roof area is usually less constrained. Detached homes may support larger systems, but bigger is not automatically better if most electricity is exported at a low rate.
Bungalows can be attractive for installation access, though roof orientation and available south, east or west-facing space still matter more than the building label.
How to compare quotes without getting distracted
Do not compare two quotes only by the final price. Compare the proposed system size, panel count, inverter model, workmanship warranty, product warranties, MCS certification, scaffolding assumptions, battery readiness and estimated generation method.
A cheap quote that excludes scaffolding or assumes unrealistic self-consumption is not cheap in the way a homeowner needs it to be cheap. It is just missing some arithmetic.
Common questions
What is the average cost of solar panels in the UK?
Many domestic solar installations fall somewhere around GBP 5,000 to GBP 12,500 before battery storage, depending on system size and property complexity. A survey is needed for a firm price.
Does a battery double the cost?
Not usually, but a battery can add several thousand pounds. The value depends on electricity use, tariff, daytime occupancy and whether the system would otherwise export a lot of energy.