It is one of the first questions almost everyone asks, and it is a fair one. Solar panels are a significant investment, and before you commit, you want to know exactly what you are getting into. The honest answer is that costs vary depending on the size of your system, the type of panels you choose, and whether you are adding battery storage. But we can give you a clear picture of what to expect.
Typical Installation Costs in the UK
For a standard home solar PV system in the UK, you are generally looking at the following ballpark figures:
A 3kWp system (around 6 to 7 panels) is suited to smaller homes or couples and typically costs between £4,000 and £7,000 installed.
A 4kWp system (around 8 to 10 panels) is the most popular size for an average three or four-bedroom home and usually falls between £5,500 and £9,000.
A 6kWp system (around 12 to 14 panels) is better suited to larger homes with higher energy usage and tends to cost between £8,000 and £12,000.
If you add a battery storage system to store your unused solar generation, expect to add another £2,500 to £5,000 on top, depending on the capacity of the battery.
These prices include supply, installation, scaffolding (where needed), electrical work, and registration with the relevant authorities. VAT on solar panels and batteries is currently charged at 0% for domestic properties in Great Britain, which makes a meaningful difference to the overall cost.
What Affects the Price?
Several factors will influence the final quote you receive:
System size is the biggest driver. The more panels and the higher the total output capacity, the more you will pay. However, larger systems also generate more savings, so the relationship between cost and return is not linear.
Panel quality matters too. Budget panels from lesser-known manufacturers may be cheaper upfront but could underperform or fail earlier. Reputable brands such as Jinko, LONGi, and REC tend to offer a better balance of cost and long-term reliability.
Roof complexity plays a role. A simple pitched roof with south-facing sections is straightforward to work on. Multiple roof angles, awkward access, or listed building considerations can add to the labour cost.
Inverter type is another variable. Standard string inverters are cost-effective, while microinverters or power optimisers (which allow each panel to perform independently) cost more but can be worth it if your roof has shading from chimneys, trees, or neighbouring buildings.
Battery storage is optional but increasingly popular. Adding a battery means you can use your solar generation in the evenings rather than exporting it cheaply and buying it back at full price later.
Is It Worth the Outlay?
For most homes, yes. A typical 4kWp system with battery storage can save a household £700 to £1,200 per year depending on energy usage, the local grid export rate, and how much of the generated electricity you use directly. At those savings levels, many systems pay for themselves within 6 to 10 years, with panels typically lasting 25 years or more.
Factor in rising energy prices and the Smart Export Guarantee payments you receive for exporting surplus power to the grid, and the financial case strengthens further. Every year that energy prices rise, your savings grow.
Getting the Right Quote
Always obtain at least two or three quotes from reputable local installers who will take the time to understand your home and your needs. Certification matters because it is required to register your system properly and qualify for grid export payments.
A proper site survey is essential. The right installer will assess your roof’s suitability, review your energy bills, and provide a clear, itemised recommendation — not a one-size-fits-all package pushed through on price alone.
Be cautious of quotes that seem dramatically lower than the market rate. A poorly installed system can cause roof damage, underperform significantly, or fail to qualify for the export tariff, turning an apparent bargain into an expensive problem.
Get in touch for a no-obligation chat about what the right system looks like for your home.