Insulation & Walls

Cavity Wall vs Solid Wall: 7-Year vs 28-Year Payback

Published 2 Jun 2026

What this video covers

Cavity wall insulation: £1,200. Saves £160/year. Pays back in 7.5 years. Solid wall insulation: £12,000. Saves £285/year. Pays back in 28 years.

4.5 million UK homes still have unfilled cavities. Free money on the table.

In this video

  1. 0:00 4.5 million homes with unfilled cavities
  2. 0:11 Cavity: £1,200 install, 7.5-year payback
  3. 0:22 Solid: £12,000 install, 28-year payback
  4. 0:38 axiom ECO HOMES
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