Indicative 4 kWp install in Swansea: £6,700–£7,850. Region: North / Wales (×0.96). Annual irradiance: ~940 kWh/kWp.
What Swansea homeowners actually pay
Swansea has surprisingly strong solar economics — Gower-coast irradiance of ~940 kWh/kWp/yr is on par with Bristol, while installer rates are lower than English equivalents. A 4 kWp install on a typical Sketty or Killay semi lands £5,500–£7,200, generating ~3,760 kWh/yr. Slate Victorian terraces in Uplands and Brynmill add modest labour; coastal homes in Mumbles need marine-grade hardware, and income-eligible owners should check the Welsh Nest scheme first.
Local notes for Swansea
Coastal irradiance ~940 kWh/kWp/yr — comparable with Bristol.
Mumbles and Gower coastal exposure — marine-grade fixings recommended.
Slate-roofed Victorian terraces in Uplands and Brynmill take longer to mount.
Welsh Government's Nest scheme can fund solar for income-eligible homeowners.
Field notes
Strong irradiance — ~3,760 kWh/yr from a 4 kWp south-facing system.
DNO is NGED — typical G99 turnaround 4–6 weeks.
Check Welsh Nest scheme eligibility before private finance.
Frequently asked questions
Are Welsh solar prices lower than English?
Marginally — typically 5–8% below south-west England for the same kit, mainly on labour. Materials and inverter costs are identical.
What grants exist for solar in Wales?
The Welsh Government's Nest scheme funds energy-efficiency measures including solar PV for income-eligible households. Worth checking before paying privately.