Solar Panel Costs in Cardiff
Solar panel installation costs in Cardiff in 2026 depend primarily on system size (measured in kilowatts peak, kWp) and the number of panels. Typical residential systems:
| System size | Panels | Typical cost (Cardiff, 2026) |
|---|---|---|
| 3.5 kWp | 8–10 panels | £5,500–£7,500 |
| 5 kWp | 12–14 panels | £7,500–£10,000 |
| 6 kWp | 14–18 panels | £9,000–£12,500 |
| Battery storage (add-on) | , | £3,000–£6,000 |
Most Cardiff homes can accommodate a 3.5–5 kWp system on south, southeast, or southwest-facing roofs. Cardiff's latitude means slightly lower generation than southern England, typically 800–900 kWh per kWp per year.
Grants and Incentives in Wales
Smart Export Guarantee (SEG): You can earn money for excess electricity exported to the grid. Rates from licensed SEG generators vary, compare before choosing.
Warm Homes Programme (Wales): Means-tested Welsh Government grant for energy efficiency including solar PV and battery storage. Worth checking eligibility before spending on a full installation, qualifying households can receive significant funding.
0% VAT on residential solar: As of 2022, residential solar panel installations attract 0% VAT in the UK, reducing costs compared with commercial installations.
Choosing a Cardiff Solar Installer
For any solar installation in Cardiff:
- Check the installer is MCS (Microgeneration Certification Scheme) accredited, required for SEG applications
- Get 2–3 quotes from MCS installers
- Ask for a site survey before committing, roof condition and orientation affect output significantly
- Ask about warranties: panels typically have 25-year performance warranties, inverters 5–12 years
- Check the installer is registered with the Electrical Safety Register (NAPIT or NICEIC) for the electrical installation work
Cardiff's terraced housing presents some constraints, shared roofs, limited south-facing area, that a proper site survey will identify.