Energy Academy
Retrofit Strategies & Sequencing11 / 13

Window & Door Replacement

Payback for single to double/triple conversion; cost per m²; bundling with other work.

10 min read · Jacob Willis, Net Zero Lead


Replacing windows is the most visible fabric upgrade and often the one occupants ask for first - but on pure energy grounds it usually has the longest payback. Knowing when it makes sense avoids disappointment.