How much do solar panels cost in Watford?

The Energy Saving Trust says domestic systems are generally around 4.5 kWp and cost around £7,600, and battery storage tends to cost around £5,000 to £8,000. Your price depends on system size, roof access, whether you choose panels or tiles, whether they are integrated into the building, and whether the roof covering needs renewing. Domestic solar panels and batteries are zero-rated for VAT until 31 March 2027, then 5%. For scale, PVGIS estimates a 4.5 kWp south-facing array in Watford generates about 4,560 kWh a year. At Ofgem's October to December 2026 cap unit rate of 26.32p per kWh, and 12p per kWh export on Outgoing Octopus's variable tariff, using 40% of that at home (our assumption) would be worth about £808 a year before any battery. A survey sets your actual price.