How much does it cost to remove moss from a roof?

A typical semi-detached roof clean is £500,£900 depending on pitch, tile type and access. Detached three-storey homes run £900,£1,500. Always priced fixed after survey.

Should you remove moss from a roof in the UK?

Yes, left alone, moss holds water against tiles and accelerates freeze-thaw cracking. Removing it extends roof life and improves drainage.

Can you pressure wash a roof?

Never at standard high pressure, that strips the protective coating from tiles and forces water under the laps. Where pressure is used at all it's heavily reduced and run through a flat surface cleaner so water impact is spread evenly. Most of the work is hand-scraping plus a soft-wash biocide.

Will the moss grow back?

Treated roofs typically stay clear for 4,7 years. An annual or biennial top-up biocide spray extends that significantly.

Do you walk on the roof?

Only where strictly necessary, on roof ladders that spread load. Most surveys and cleaning are done from ground level using our Insta360 pole camera and extending lances, no scaffold needed for most jobs.

Will you protect the planting and lighting?

Yes. Beds, lighting and anything vulnerable are covered and rinsed down before and after as standard.

Is soft washing better for a large roof?

For moss, yes. Soft washing kills the growth without dislodging tiles or forcing water under the laps, which pressure washing a roof absolutely can.

Executive homes a speciality, soft-wash methods for sensitive finishes.

Roof Cleaning in Knowle

Soft-wash & low-pressure roof cleaning. Hand-scraped moss. Tiles protected, not blasted.

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Doing the roof and gutters together? See our roof and gutter cleaning offer

Roof cleaning in Knowle starts from £500 for a typical semi-detached property. We use a soft-wash treatment with low-pressure methods, never destructive high pressure. Heavy moss is scraped off by hand or lifted with a flat surface cleaner dialled down to a safe low pressure, then the roof is treated with a biocide that kills spores at the root and tiles return to original colour over the following weeks. Standard high-pressure jet washing blasts away protective coatings and shortens roof life by years, we tune our kit to protect the tiles.

roof cleaning in Knowle, what we actually find here

The housing round here. Executive and period property in B93, timber-framed and historic buildings on the High Street, and large detached homes with mature gardens through Bentley Heath.

Why Knowle exteriors get dirty. Sensitive finishes are the norm here, painted render, historic timber and softer brick, alongside big roofs with a lot of surface to keep moss off.

Access and pricing. Landscaped gardens and lighting get protected and covered before we start, which we treat as part of the job rather than an extra.

Covering B93, including Dorridge, Bentley Heath, Lapworth.

Why professional roof cleaning matters

Roof moss isn't just ugly, it acts like a sponge, holding water against tiles. In winter that water freezes, expands and cracks the surface. The right fix is biocide and patience, not destructive blasting. Standard high-pressure jet washing strips the factory glaze from concrete and clay tiles and voids most roof warranties. Our method uses high water flow at heavily reduced pressure to lift dirt safely, plus a specialist biocide that kills moss properly, the natural colour returns over the coming weeks as rain washes the dead growth away.

Concrete & clay tiles

Slate (natural & fibre cement)

Pantiles & interlocking tiles

Flat roofs (felt, GRP, EPDM)

Our roof cleaning process

Honest, step-by-step. No surprises on the day.

1
Survey
Insta360 pole-camera roof survey from the ground, we check tile condition and pick the safest pressure setting before quoting.
2
Moss removal
Heaviest moss removed by hand or with a low-pressure flat surface cleaner that spreads water impact evenly without damaging tiles. Gutters cleared at the same time.
3
Soft-wash biocide
Low-pressure soft-wash biocide, kills microscopic moss spores so they don't grow back next year.
4
Optional sealing
Breathable colour-restore or biocide topcoat available where the tile finish allows.
5
Tidy up
All removed moss bagged and taken away, gutters, drives and borders left spotless.