My roof tiles are covered in green moss and some have started to discolour. A neighbour said I should get them treated or replaced before water gets trapped underneath. The roof is about 60 m² and I'm worried about the cost. Is this something I can ignore, or do I need to act now?
Moss and algae don't immediately cause leaks, but trapped moisture can shorten tile life and damage the underlayer. You have three options: (1) Professional cleaning + biocide treatment: €800–€1,500 for 60 m², lasts 3–5 years. (2) Tile replacement if damage is patchy: €2,500–€5,000 depending on how many need replacing. (3) Full re-tiling: €6,000–€12,000+. Cost depends on roof pitch, accessibility, and whether tiles are standard or hard-to-match heritage types. Treatment is cheapest and buys time; replacement only if tiles are cracked or missing. Post your situation on AstraNL to get quotes from local Haarlem roofers who can inspect and advise whether treatment suffices or replacement is needed.
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