Roof window and dormer leaks

Leaks around a roof window or dormer: the junctions are the first to go.

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Roofer giving a reassuring thumbs-up on the repaired roof while the relieved residents look on and the rain clears

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Around roof windows and dormers, many materials meet: flashing kits, underlay connections, sealant and lead. It is precisely these junctions that leak first — often only visible during rain with wind from one particular direction.

Repairs cost € 125 to € 400: from renewing sealant joints and underlay connections to redressing the lead around the dormer. On an ageing roof window, the flashing kit may need replacing.

Note: condensation is regularly mistaken for a leak. Drips under a roof window in cold, dry weather often point to condensation or a ventilation problem — a professional spots the difference quickly.

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Free and without obligation · Response usually within 24 hours

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