Solar panel installations have become one of the most common home energy improvements in the UK, driven by high electricity prices. The economics are compelling for homeowners with suitable properties — but they're not right for everyone. Here are the honest numbers.
How Much Do Solar Panels Cost in 2026?
A typical 3.5kWp (kilowatt peak) solar panel system for an average UK semi-detached home costs approximately £5,500-£8,000 installed in 2026. A larger 6kWp system for a bigger home costs £8,000-£12,000. Prices have fallen significantly from the peak of 2012-2015. No grant is available for standard solar panels (though ECO4 may cover them for qualifying households).
- •3.5kWp system: £5,500-£8,000 installed
- •6kWp system: £8,000-£12,000
- •Prices fallen 60%+ since 2012 peak
- •Battery storage add-on: £3,000-£6,000 extra
- •VAT on solar panels: 0% (removed in 2022)
Do you need planning permission for solar panels?+
Usually no — solar panels on most residential roofs are permitted development. Exceptions include listed buildings, conservation areas, and flat roofs facing the street. Check with your local council if unsure.
How Much Can You Save?
Annual savings depend on system size, your electricity usage, and how much of the generated electricity you use directly. The Energy Saving Trust estimates savings of £400-£600/year for a typical household with a 3.5kWp system and no battery. With a battery, which stores excess generation for evening use, savings increase to £600-£1,000/year.
- •3.5kWp without battery: £400-£600/year estimated savings
- •3.5kWp with battery: £600-£1,000/year estimated savings
- •Savings higher if you use more electricity during the day
- •EV charging from solar: significant additional saving
- •South-facing roof with no shading: optimal — north-facing is not worth it
Smart Export Guarantee (SEG): Get Paid for Excess Power
The Smart Export Guarantee (SEG) requires licensed energy suppliers to pay you for electricity you export to the grid. SEG rates vary by supplier — Octopus Agile and some others pay competitive rates. For a 3.5kWp system, annual SEG income is typically £100-£300 depending on rates and how much you export.
- •SEG: mandatory payment scheme for solar export
- •Compare SEG rates before choosing your energy supplier
- •Octopus Energy: competitive SEG rates
- •Requires a smart meter
- •Extra £100-£300/year income on top of self-use savings
Payback Period and ROI
At £6,500 installation cost and £700/year savings (including SEG), payback is approximately 9 years. Solar panels come with 25-year performance warranties — giving 16+ years of post-payback generation. Most UK homes see payback in 8-12 years depending on system size, roof orientation, and electricity usage. With a battery, payback extends to 12-15 years.
- •Without battery: payback typically 8-12 years
- •With battery: payback typically 12-15 years
- •25-year panel warranties — long post-payback earning period
- •South/SW/SE-facing: best ROI
- •North-facing: not recommended
- •EV owners see fastest payback — charge car from solar
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