How Many Years Do Velux Skylights Last?

A VELUX roof window typically lasts 20–30 years — and plenty go longer. Installers report that many of the units they replace today are over 30 years old. VELUX backs the window itself with a 10-year guarantee (5 years for electrical components — 10 if you register — and 3 for blinds and shutters), which is a fair signal of where the confidence lies: the frame and glazing outlast everything attached to them.

What actually determines whether yours reaches 30 rather than 15 is less about the badge and more about three things: installation quality, glazing-seal life, and whether small failures get fixed before they become big ones.

What fails, in the order it fails

1. Blinds and motors first (3–10 years). Electric and solar opening mechanisms, and blinds, wear out well before the window. The 3-year blind and 5-year electrics guarantees versus 10 on the window tell you VELUX’s own expectation. All are replaceable without touching the window — the blind repair guide covers the triage.
2. Gaskets and seals (10–20 years). Rubber seals perish, and you’ll notice drafts or more outside noise. Replacement gasket kits exist for most models — a maintenance job, not a replacement trigger.
3. The glazing unit (15–25 years). Fogging or condensation between the panes means the sealed unit has failed. The fix is a replacement pane, which VELUX supplies for current and many discontinued models — far cheaper than a new window if the frame is sound.
4. Flashing and surrounding roof (variable). Most “my VELUX is leaking” cases are actually flashing, blocked drainage channels around the frame, or plain condensation — worth diagnosing properly before condemning the window.
5. The frame itself (20–30+ years). Timber frames want re-lacquering every few years, especially in bathrooms and kitchens where humidity attacks the finish. Neglected timber is the usual reason a window dies at 20 instead of 30. Polyurethane-coated frames (the white ones) are effectively maintenance-free.

Making yours last longer

The maintenance list is short and unglamorous: clean the glass and check the drainage channels around the frame once a year, clear leaves and moss from the flashing, re-lacquer or re-paint timber frames when the finish dulls, and replace perished gaskets when drafts appear. An hour a year, and it’s the difference between the 20-year and 30-year outcome. Whether that effort is worth it versus buying cheaper and replacing sooner is exactly the trade-off in whether VELUX is worth the premium.

Repair or replace?

Repair when the frame is sound: fogged glazing (new pane), drafts (new gaskets), dead motor (new motor), tired blind (new blind). VELUX’s spare-parts availability for old models is genuinely one of the reasons the brand costs more.

Replace when the frame is rotten or cracked, the model is so old that parts are gone, or you’re re-roofing anyway — swapping windows during a re-roof saves most of the labour. Persistent leaks that survive re-flashing usually mean the frame has distorted.

Replacement is cheaper than people expect: a like-for-like swap into an existing opening runs £500–£800 fitted, per our skylight cost guide, because the structural work — the expensive part of a new installation — is already done. VELUX publishes size-conversion charts mapping decades-old size codes to current models, so even a 1990s window usually has a drop-in modern equivalent (with dramatically better glazing).

One planning note: like-for-like replacement doesn’t need planning permission, and even new openings usually don’t either — though building regulations apply to the thermal upgrade, which a competent-person-scheme installer self-certifies.

The bottom line

Budget for a 20–30 year life, spend the annual hour on maintenance, fix the small stuff promptly, and replace panes rather than windows when the frame is healthy. And if your VELUX is from the 1990s or earlier: it doesn’t owe you anything — the 2026 replacement will be quieter, warmer and cheaper to run than what it replaces.