Our south-facing roof valley (where two roof planes meet) has visible rust patches and the flashing is lifting slightly. The roofer who did our gutters last year said it'll need attention soon. House is 55 years old, valley is maybe 2×1 metre. Don't want a surprise leak in winter. Rough budget: €500–€1500?
Roof valley rust-through is exactly the kind of early-stage leak risk worth fixing now. Repair costs depend on whether the underlying wood is sound (just flashing replacement: €400–€800) or if rot has set in (flashing + wood repair: €800–€1600). Material (copper vs. galvanized steel), roof pitch, and access difficulty vary the price. No permit needed for this repair in Leiden. Get 2–3 quotes from local roofers — they'll inspect for hidden rot. Post your job on AstraNL with photos and your location; verified professionals will give you firm estimates within 24 hours.
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