Are Solar Panels Worth It in the UK?
Short answer: for most UK homes, yes. With electricity at 24.5p/kWh, a standard 4kWp system knocks £600–£1,100 off your annual bill and pays for itself in 8–12 years. After that you’re generating free power for another 15–20 years. The maths doesn’t work for everyone though — roof direction, daytime usage, and whether you add a battery all shift the numbers significantly.
At a glance
- Annual savings
- £600–£1,100
- Payback (panels only)
- 8–12 years
- Payback (with battery)
- 10–14 years
- 25-year return on £6k system
- ~£17,500
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When solar panels are clearly worth it
The strongest case is a south-facing roof with minimal shading, combined with decent daytime electricity use — working from home, retired, or running an EV charger. If your bill is over £100/month and you’re using power while the sun’s up, payback drops to 7–9 years. Adding a heat pump or EV later makes the case even stronger because you’re offsetting more expensive grid electricity.
When it’s more marginal
North-facing roofs generate 40–45% less than south-facing, which stretches payback well beyond 12 years. Low electricity usage (under £50/month) also weakens the case because there’s less bill to offset. The good news: east/west roofs — the most common orientation in the UK — only lose 15–20% versus south, so they still work well.
| Roof direction | Output vs south-facing |
|---|---|
| South | 100% |
| South-east / south-west | 90–95% |
| East / west | 80–85% |
| North-east / north-west | 60–65% |
| North | 55–60% |
Battery: yes or no?
Without a battery, you’ll use about 40% of what your panels generate and export the rest at 5–15p/kWh — far less than the 24.5p you’d pay to buy it back in the evening. A battery (typically £2,500–£5,000) pushes self-consumption to around 70%, which means more of your solar power displaces expensive grid electricity. It adds 2–3 years to payback but lifts your total savings over 25 years.
Without battery
- •Self-consumption ~40%
- •Export surplus at 5–15p/kWh
- •Payback 8–12 years
- •Lower upfront cost
Best if you’re home during the day
With battery
- •Self-consumption ~70%
- •Use solar power in the evening
- •Payback 10–14 years
- •Higher total lifetime savings
Best if you’re out during the day
The 25-year view
Spend £6,000 now, save £700 a year, and you’re in profit after about 8.5 years. Over 25 years the cumulative saving is roughly £17,500 — nearly three times what you paid. That’s at today’s electricity price. Historically UK electricity has risen faster than inflation, so the real return is likely higher. Panels degrade slowly (about 0.5% per year), but even at year 25 they’re still producing around 87% of their original output.
Frequently asked questions
How much can I save with solar panels?
What’s the payback period for solar panels?
Do solar panels add value to my house?
What happens when it’s dark?
How we calculate estimates
Our estimates use published data from the Energy Saving Trust, Ofgem tariff caps, and MCS installer pricing. We model savings based on your home size, insulation level, and current heating system. All figures are indicative — your actual costs will depend on your installer's survey and quote.
Check if solar is worth it for your roof
Get a personalised estimate based on your property — takes 2 minutes.