Are Solar Panels Worth It in the UK? (2026 Honest Answer)

Two things have made solar panels more worthwhile than ever: panel costs have fallen dramatically, and electricity prices have risen sharply. The Ofgem price cap sets the standard unit rate at 24.5p/kWh in Q1 2026 — more than double what it was five years ago. Every unit of solar electricity you generate and use yourself saves you that 24.5p.

A 4kW system on a south-facing roof in central England generates roughly 3,400–3,800 kWh per year. If you use 50% of that directly (the typical self-consumption rate without a battery), that is around 1,700–1,900 kWh of grid electricity you no longer need to buy, saving £415–£465 per year on bills alone.

The remaining 50% is exported to the grid under the Smart Export Guarantee, earning you around 4.5p per kWh — adding another £75–£85 per year. In total, a 4kW system typically saves £500–£700 per year depending on your exact usage and roof orientation.

Solar panels are usually a good investment if:

• Your roof faces south, south-east, or south-west. These orientations capture the most sunlight. Even east- or west-facing roofs produce around 80% of a south-facing system, which is still worthwhile.
• Your roof is free from heavy shading. Trees, neighbouring buildings, or chimneys that cast significant shade will reduce output. Light shading is manageable, but heavy shading can cut generation by 45%.
• You own your home. Solar panels are a long-term investment. If you plan to stay in your home for at least 8–10 years, you will likely recoup the full cost and then benefit from free electricity.
• You use electricity during the day. The more solar you use directly, the more you save. Working from home, running appliances during daylight hours, or charging an electric vehicle during the day all improve the return.
• You have high electricity bills. The higher your current bill, the more solar saves you. Households spending over £100 per month on electricity stand to benefit the most.

We believe in giving honest advice. Solar panels are not the right choice for everyone:

• North-facing roofs. A north-facing roof only captures around 55% of a south-facing roof's output, making the payback period much longer and the investment less attractive.
• Heavy shading throughout the day. If tall trees or buildings cast shade across your roof for most of the day, solar generation will be significantly reduced.
• You plan to move soon. If you expect to sell within 3–5 years, you may not recoup the full cost. That said, solar panels can add value to a property and improve its EPC rating.
• Your roof needs replacing. If your roof is in poor condition, it makes sense to replace it first. Removing and reinstalling solar panels is costly and disruptive.

Solar panels are warranted for 25 years and typically last 30+. Over a 25-year period, a 4kW system that costs £6,500 and saves £600 per year delivers total savings of around £15,000 — a net gain of roughly £8,500, or an effective annual return of 3–5%.

This compares favourably with many traditional investments, and it is effectively tax-free. You do not pay income tax or capital gains tax on electricity you generate for your own use, nor on Smart Export Guarantee payments (at current income levels).

If electricity prices continue to rise — which most industry forecasts expect — the return improves further. Every 1p increase in the unit rate adds roughly £17–£19 per year to your savings from a 4kW system.