Moss on Roof Tiles
Thick green moss growing across roof tiles, particularly on the north-facing side of the roof.
What Is Causing This?
- 1Shaded roof areas that stay damp
- 2Porous or older tiles holding moisture
- 3Overhanging trees providing shade and dropping debris
How Urgent Is This?
This is a cosmetic issue. It is not causing damage and can be addressed in your own time.
What Needs to Be Done
A roofer will carefully remove the moss by hand or with a soft brush, avoiding pressure washing which can damage tiles. They may apply a biocide treatment to prevent regrowth.
How Much Will It Cost?
National average estimate
Labour: £975 – £2,575 | Materials: £725 – £2,050
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Prices are estimates based on typical UK rates. Actual costs depend on the specific issue, accessibility, and your location. All quotes from tradespeople on Tradesfolk are completely free.
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Some fixes for this problem may require planning permission or building regulations approval. Check if your project needs permission:
How to Prevent This
Trim back overhanging branches to increase sunlight on the roof. Apply a moss-prevention treatment every 2 to 3 years. Keep gutters clear to improve drainage.
Related Problems
Other Roofer Problems
One or more roof tiles have slipped, cracked, or blown off, leaving exposed areas on the roof.
Water coming through the roof into the loft space or directly through the ceiling, often during or after rainfall.
The ridge line along the top of the roof has a visible dip or sag instead of running straight.
Rainwater overflows from the guttering during rainfall, running down the outside walls of the house.