How Much Do Solar Panels Cost in the UK Right Now
A typical 4kWp solar panel system for a UK home costs between £5,000 and £8,000 fully installed in 2026. This represents a 30% reduction from 2022 prices due to falling panel costs and increased installer competition. The Microgeneration Certification Scheme (MCS) registers over 4,000 certified installers across the UK.
Solar Panel System Prices by Size
| System Size | Number of Panels | Installed Cost | Annual Generation | Annual Saving |
|---|---|---|---|---|
| 3kWp | 8-10 | £4,000-£6,000 | 2,600 kWh | £600-£800 |
| 4kWp | 10-13 | £5,000-£8,000 | 3,400 kWh | £800-£1,100 |
| 5kWp | 13-16 | £6,000-£9,500 | 4,200 kWh | £950-£1,300 |
| 6kWp | 16-19 | £7,000-£11,000 | 5,100 kWh | £1,100-£1,500 |
Smart Export Guarantee Payments
The Smart Export Guarantee (SEG) pays you for electricity exported to the grid. Current SEG rates range from 3p to 15p per kWh depending on your energy supplier and tariff type. Octopus Energy and EDF offer some of the highest rates. A 4kWp system exporting 50% of its generation earns £50-£250 per year through SEG payments.
Real Payback Periods for UK Homeowners
Based on current electricity prices of approximately 24.5p per kWh under the Ofgem price cap, a 4kWp system achieves payback in 6-9 years. This calculation accounts for self-consumption (typically 40-60% without battery), SEG income, and panel degradation of 0.5% per year. Solar panels come with 25-year performance warranties.
Battery Storage Changes the Economics
Adding a 5kWh battery storage system costs an additional £2,500-£4,500 but increases self-consumption from 40-50% to 70-80%. This additional self-consumed electricity at 24.5p per kWh delivers savings that typically pay back the battery cost within 8-12 years. Popular battery brands include Tesla Powerwall, GivEnergy, and SolaX.
Planning Permission and Installation Requirements
Most domestic solar installations fall under permitted development rights and do not require planning permission. Exceptions include listed buildings, conservation areas, and installations that protrude more than 200mm from the roof surface. All installations must be carried out by an MCS-certified installer to qualify for SEG payments.
