Why Velux Windows Leak in Guildford
The overwhelming majority of Velux leaks in Guildford originate from failed EDW or BDX flashing kits rather than from the window unit itself. The flashing kit is the system of lead, aluminium and rubber components that integrates the window into the roof covering. On Guildford's older loft conversions — many carried out in the 1990s and early 2000s — these flashing kits are now 20–30 years old and showing thermal fatigue, particularly the lead apron at the base of the window. Condensation leaks — moisture forming on the inside of the glass — are a separate issue entirely and indicate ventilation problems in the roof void rather than a flashing failure.
Velux Flashing Kit Replacement in Guildford
When a Velux flashing kit fails, we strip the existing kit, inspect the deck boards and surrounding tile bed, and install the current Velux EDW or BDX flashing kit specified for your tile profile and window model. Velux flashing kits are available for all current and recent tile profiles used across Guildford — clay plain tile, concrete interlocking and slate. The correct kit for your specific tile is essential — using a generic or incorrectly specified kit is a common cause of re-leaking after repair.
New Velux Installation in Guildford
We carry out new Velux installations on pitched roofs across Guildford — whether as part of a loft conversion project, adding light to an existing loft room, or replacing a non-standard rooflight with a current Velux product. We specify the correct window size and type for the application, install with the correct flashing kit for your tile profile, and complete internal lining and reveal as required. Conservation area properties require checking whether permitted development rights apply to rooflight installation on the relevant roof slope.