Solar · 6 min read
Is solar actually worth it in the UK?
Solar panels have moved from niche to mainstream on UK rooftops, but they are not the right fit for every home. This guide walks through what genuinely affects the numbers — your roof, your energy use, and the export tariff you can sign up to — so you can decide whether it is worth the spend on your property.
Key things to consider
Roof orientation and shading
South-facing roofs generate the most, but east or west-facing slopes still produce around 80% of the output. Heavy shading from trees, chimneys or neighbouring buildings is what really hurts performance.
How much electricity you use at home during the day
The more you use while the sun is up, the better the return. Working from home, an electric car, or a heat pump all push the maths in your favour.
Export tariffs (SEG)
Any electricity you do not use is exported to the grid. Smart Export Guarantee rates vary widely between suppliers — comparing them is one of the biggest levers on payback.
Pros
- Lower electricity bills, often 40–70% in summer months
- Predictable energy costs for 20+ years
- Adds to EPC rating and home value
- Pairs well with batteries and EV charging
Cons
- Upfront cost of £5,000–£9,000 for a typical install
- Shaded or north-facing roofs see weaker returns
- Payback is slower if you are out of the house all day
- Scaffolding and roof access add complexity on some properties
What it actually costs
Typical install cost
A 4kW system for a 3-bed semi usually lands between £5,500 and £8,000 fitted, including inverter, mounting and certification.
Realistic payback
Most UK homes recover the cost in 7–10 years at current electricity prices, with the system continuing to produce for another 15+ years after that.
FAQs
Do I need planning permission?
In most cases no — solar panels are usually permitted development. Listed buildings and some conservation areas are the exception.
Will panels work on a cloudy day?
Yes, just at reduced output. UK systems are designed around the local irradiance, so the annual generation figures already account for British weather.
How long do panels last?
Most panels carry a 25-year performance warranty and continue producing beyond that, typically at 85%+ of their original output.
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