Is it worth replacing 20 year old double glazing?
Often yes, if the units have misted, the frames are warped or draughty, or the hardware is failing. Windows of that age were built to older standards than today’s 1.4 W/m²K limit. If the frames are sound and only the glass has failed, replacing the sealed units may be enough.
What signs mean replacement is worth it?
- Misting or condensation trapped between the panes
- Draughts around the sashes or frame
- Hinges, handles or locks that stick, drop or no longer lock securely
- Warped, cracked or discoloured frames
- Noise or cold spots near the glass
What does current regulation require?
Since 15 June 2022, replacement windows in England must achieve a U-value of 1.4 W/m²K or a Window Energy Rating of Band B. Windows installed two decades ago were built to looser limits, so a new installation will normally perform better.
When is it not worth replacing?
If the frames are straight, secure and well sealed, new glass units alone can restore performance at lower disruption. Our surveyor will tell you which route fits when assessing your uPVC windows. Savings on heating depend on how leaky and inefficient the old windows were, so a survey gives a better answer than a rule of thumb.
Thinking about new windows? We supply and fit across Stamford Hill, Haringey, Enfield, Barnet, Ilford and the rest of North and East London, with a 10-year guarantee and FENSA-registered installation. Call 020 8800 1838 or request a quote.