Windows: lifespan and cost
Windows are both an upkeep and an energy question. The table shows how long different windows last and what a replacement usually costs per window.
The ranges apply to a normal-sized house. Actual cost depends on size, access and region. Lifespan means technical lifespan with normal upkeep. In a share-based flat the big repairs are a share of the housing company’s project and show up in the charge or the company loan.
| Component | Lifespan | Replacement cost |
|---|---|---|
| Wooden windows | 40 yrs (30-50) | 8 000-30 000 € |
| Wood-aluminium windows | 45 yrs (35-55) | 10 000-35 000 € |
| PVC windows | 35 yrs (25-45) | 7 000-25 000 € |
| Insulated glazing units | 30 yrs (20-40) | 4 000-12 000 € |
How long does a window last?
A well-maintained wooden window can last a very long time, longer than many modern windows, because it can be renovated piece by piece. PVC and wood-aluminium windows need less care but cannot be repaired the same way once they are spent. The insulated glazing units in the window have their own, shorter life and may need replacing even when the frame is sound.
What does replacing windows cost?
The price is usually per window and depends on size, type and whether the whole frame is replaced or only the glass. Replacing every window at once is a large item, but often lowers heating costs. The cost in the table is for one normal-sized window, fitted.
Is it worth renovating old windows instead of replacing?
Often yes, if the timber is sound. Older heartwood windows are made to be re-puttied and painted, and a renovation is cheaper than new. If the frames are rotten, replacement pays off better.
What does condensation between the panes mean?
Condensation inside a sealed unit means it has failed and lost its insulating gas. The unit then needs replacing. It says nothing about the frame, which can be perfectly fine.
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