How Much Does Roof Cleaning Cost in Cobham? (2026 Guide)
Roof cleaning in Cobham typically costs between £295 and £1,250 depending on size, pitch, moss depth and access. This is the only fully transparent 2026 price guide for the local area — based on the last 400 jobs we've quoted within the KT11 postcode.
What's included
- Average Cobham semi-detached: £495
- Average detached: £895
- Scaffold (if required): £450 – £950 extra
- Annual maintenance visit: £125
Our process
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Step 1
Roof size
Measured in m² from drone footage — bigger roof, more biocide and labour.
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Step 2
Moss depth
Heavy moss requires hand-scraping before biocide, adding a day's labour.
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Step 3
Access
Roofs over 8m or with extensions may need tower scaffold.
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Step 4
Roof material
Slate, clay and concrete have different cleaning protocols and chemical dwell times.
Indicative 2026 pricing
| Soft wash only — semi | £395 – £595 | |
| Soft wash only — detached | £595 – £995 | |
| Moss removal + soft wash — semi | £495 – £795 | |
| Moss removal + soft wash — detached | £795 – £1,395 | |
| Add gutter clear | +£85 – £195 | |
| Add tower scaffold (per side) | +£250 – £450 |
Frequently asked questions
Why is roof cleaning so expensive?
Working at height is high-insurance, high-PPE work. A properly insured Cobham contractor pays around £6,500/year for £5m public liability and full PASMA training. Avoid quotes under £250 — the contractor is almost certainly uninsured.
Is roof cleaning worth the money?
A £495 clean can extend tile life by 10–15 years and avoid a £8,000+ re-roof. RICS surveyors also report clean roofs add 3–5% to a Cobham property's perceived value.