Roof cleaning is one of the most overlooked forms of home maintenance, yet a build-up of moss, algae, lichen and grime can cause serious long-term damage to your tiles and underlying structure. So what should you expect to pay? This guide covers everything you need to know about UK roof cleaning costs in 2025.
Typical roof cleaning prices in the UK
Most homeowners in the UK pay between £500 and £3,000 for a full roof clean. The wide range comes down to the size of your roof, how heavily soiled it is, and which cleaning method is used.
Typical price ranges by house type:
These prices usually include the clean itself. If a biocide treatment or protective sealant is added, expect to pay an additional £100–£500.
What's included in a roof clean?
A standard roof cleaning job typically includes:
- Removal of loose moss and debris by hand or brush
- Pressure washing or soft washing of the tile surface
- Clearing of gutters and valleys of loosened material
- A post-clean inspection
Some contractors also offer a biocide treatment as part of the package, which kills remaining spores and helps prevent regrowth for 2–5 years. Always ask whether this is included or an add-on.
What affects the cost?
Several factors will move your quote up or down:
Roof size: The bigger the roof, the more time and product required. Most contractors price per square metre or give a flat rate based on the overall roof area.
Level of moss and soiling: A heavily mossy roof takes significantly longer to treat than a lightly soiled one.
Roof pitch: Steeper roofs are more difficult and slower to work on safely, increasing labour costs.
Access: If scaffolding or a cherry picker is needed rather than a ladder, this can add £200–£600 to the price.
Roof type: Natural slate and older clay tiles require gentler treatment than modern concrete tiles, which may affect method and price.
Location: Labour rates are higher in London and the South East than in the North, Midlands or Scotland.
Pressure washing vs soft washing — which costs more?
Pressure washing uses high-pressure water to blast away moss and grime. It's faster and generally cheaper, but carries a risk of damaging older or fragile tiles if not done carefully.
Soft washing uses low-pressure water combined with specialist biocide solutions. It's gentler, more thorough and longer-lasting — but typically costs 10–25% more than pressure washing.
For most UK homes with clay or concrete tiles, soft washing is the recommended approach. For newer or robust tile types, pressure washing may be perfectly adequate.
Should you include a roof treatment?
A biocide or algaecide treatment after cleaning kills any remaining moss spores and algae, and prevents regrowth for 2–5 years. Without it, moss typically returns within 12–18 months.
The treatment usually adds £100–£400 to the overall job but is well worth it for the longevity it provides. Many specialist roofers include this as standard — always confirm before accepting a quote.
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Frequently asked questions
How often should I have my roof cleaned?
Most roofs in the UK benefit from a clean every 3–5 years, though north-facing roofs or those in damp or wooded areas may need attention more frequently. A biocide treatment can extend the interval significantly.
Is roof cleaning worth it?
Yes. Moss and lichen hold moisture against your tiles, accelerating freeze-thaw damage and potentially shortening the life of your roof by years. Regular cleaning is far cheaper than a full re-roof.
Can I clean my roof myself?
While it's possible, working at height carries serious safety risks and incorrect technique can damage tiles. Most homeowners find it safer and more cost-effective to hire a professional, especially for two-storey houses.
How long does a roof clean take?
A typical semi-detached house takes 4–8 hours. Larger or heavily soiled roofs may take a full day or require a second visit.
Will roof cleaning damage my tiles?
When done correctly by a professional using the right technique for your tile type, roof cleaning should not damage your tiles. Always ask whether the contractor uses soft washing or pressure washing, and confirm they have experience with your specific tile type.