This depends on the size of the system and how easy the panels are to install. A typical cost is about £6,000 for a system of twelve panels rated at 370Wp per panel (4.44kWp in total). This is the size of system that would be suitable for an average family home. We’ll assume this is the system you have in the examples below.
The good news is the government has removed VAT on both the labour and materials elements of solar PV installations, with effect from 1st April 2022. Previously VAT has been charged at either 5% or 20%, depending on the cost breakdown between labour and materials and customer eligibility for the discount.