How much does roof cleaning cost in Bristol and Bath?
Short answer: roof cleaning and moss treatment in Bristol and Bath starts at £350. A standard semi with a concrete interlocking roof usually lands between £350 and £550. A large detached property, a steep slate roof, or a traditional stone-tile roof sits above that, and is quoted after a site visit rather than from photos.
Why roof cleaning is not priced like driveway cleaning
A drive is measured in square metres. A roof is priced on area, pitch, covering type, access and what the moss has already done. The same 60m² of roof can be a half-day on a modern concrete tile at ground level with a pole, or a full day with proper access planning on a steep Victorian slate.
What the method actually is
We treat with a biocide at low pressure and let the growth die and weather off over the following four to eight weeks. We do not scrape and we do not pressure wash a roof. Scraping takes the surface layer off the tile, which shortens its life and gives the moss a rougher surface to re-establish on. Pressure drives water under the laps. Both look impressive on the day and cost you later.
What moves the price
- Covering. Concrete interlocking tile is the most forgiving. Old clay plain tile is more porous and needs lower pressure and a longer rinse. Traditional stone tile on Combe Down and similar is the most method-sensitive of the lot.
- Pitch and access. Steep slate is worked from the ladder line, never by walking the slope. That is slower and it is safer, and the quote reflects it.
- Tree cover and aspect. A north-facing slope under mature trees carries more growth and will need re-treating sooner than an open south-facing roof.
- What is in the gutters. Roof work almost always fills the gutters with dead growth, so a gutter clear should be part of the same visit rather than a call-out three weeks later.
- Scaffolding. Most domestic roof cleaning is done from the ground or the ladder line and does not need it. Where it genuinely does, we say so before quoting.
What you should expect to see, and when
Some change within days. The full result at four to eight weeks. Anyone promising an instantly transformed roof is planning to scrape or pressure wash it. On a stone-tile roof in particular, that is not a trade-off worth making.
How often it needs doing
Five to six years on an open, south-facing roof. Three to four years on a shaded or north-facing slope, and sooner on the wooded slopes above the Avon Gorge or low in the Widcombe valley where the air stays damp. A residual biocide is what stretches the interval; a mechanical clean does not.
Frequently asked questions
How much does roof cleaning cost in Bristol and Bath?
From £350, with a standard semi typically between £350 and £550. Larger, steeper or traditional stone-tile roofs are quoted after a site visit.
Will the moss come back?
Eventually, yes, everywhere in this climate. How fast depends on aspect and tree cover. A residual biocide after treatment is what pushes it from three years to five or six.
Do I need scaffolding for a roof clean?
Usually not. Most domestic roof cleaning here is done from the ground or the ladder line. If your roof genuinely needs access equipment we tell you before quoting, not after starting.
Why will you not scrape the moss off?
Because scraping removes the surface of the tile, leaves the spores behind and gives the regrowth a rougher surface to anchor in. It looks better on the day and worse in three years.
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Roof cleaning & moss treatment · Gutter cleaning · All prices · Maintenance plans