Solar pays back for 80% of UK homes. Here's how to tell if you're in the 20% where it doesn't — and whether 2026 is the right year regardless.
For a typical UK home with a south, east or west roof, solar in 2026 pays back in 11–15 years against a panel lifespan of 25–30. The four cases where it doesn't pay back: north-only roofs, total annual electricity under 1,800 kWh, plans to move within 5 years where buyers won't value the install, and listed buildings where consent costs offset gains. For everyone else, waiting saves nothing meaningful.