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CosmeticCommon in SepRecommended trade: Rendering Specialist

Render Turning Green

External render developing green algae or moss growth, making the walls look dirty and neglected.

What Is Causing This?

  • 1North-facing or shaded walls staying damp
  • 2Textured render trapping moisture and organic matter
  • 3Trees and bushes close to the wall reducing air circulation

How Urgent Is This?

Cosmetic

This is a cosmetic issue. It is not causing damage and can be addressed in your own time.

What Needs to Be Done

A rendering specialist will soft-wash the render with a biocide treatment to kill the algae and prevent regrowth. Pressure washing may damage the render and should be avoided on soft finishes.

How Much Will It Cost?

£1,267 – £3,500

National average estimate

Labour: £850 – £2,233 | Materials: £417 – £1,267

Enter your postcode for a local price estimate

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.

Find a Rendering Specialist

Enter your postcode above to find local rendering specialists, or browse all rendering specialists.

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Planning Permission Guidance

Some fixes for this problem may require planning permission or building regulations approval. Check if your project needs permission:

External Wall Insulation

Whether external wall insulation needs planning permission depends on the visual impact. Adding 50 to 100mm of insulatio...

How to Prevent This

Trim back vegetation near rendered walls. Apply an algae-resistant coating after cleaning. Improve air circulation by cutting back overhanging branches.

Related Problems

Moss on Roof Tiles

Thick green moss growing across roof tiles, particularly on the north-facing side of the roof.

Render Cracking on Exterior Wall

Cracks appearing in the external render, ranging from hairline to wide splits that expose the masonry beneath.

Other Rendering Specialist Problems

Render Cracking on Exterior Wall

Cracks appearing in the external render, ranging from hairline to wide splits that expose the masonry beneath.

Render Falling Off Wall

Sections of external render detaching and falling from the wall, exposing bare brickwork or blockwork.

Damp Coming Through Render

Damp patches visible on internal walls that correspond to areas of external render, especially after rain.

Pebbledash Falling Off

Pebbledash coating losing stones or whole sections detaching from the wall.

Rendering Specialist PricesCost EstimatorFind a Rendering SpecialistSnap and FixAll Home Problems