Roof Cleaning & Moss Removal in Chelmsford
Moss on a roof is more than an eyesore. It holds moisture against the tiles, blocks gutters and valleys, and in winter it expands as it freezes — lifting and cracking tiles over time. We remove it safely with manual scraping plus a biocide softwash, never aggressive jet washing.
Across Chelmsford and Essex we clean concrete and clay tiled roofs on semis, detached homes and bungalows. Whether your north-facing slope has gone green and furry or moss is already spilling out of the gutters, we have the right, roof-safe approach for it.
Why we never jet-wash a roof
This is the single most important thing to get right — and where most roof damage happens. High pressure strips the protective surface off concrete tiles, leaving them porous and far quicker to take on moss again. Worse, it drives water underneath the tiles where it can cause leaks and damp, and can dislodge tiles altogether. The end result is a roof that has been visibly "cleaned" but whose life has been drastically shortened.
The correct method is manual moss removal followed by a biocide softwash. We take the moss off by hand and treat what remains with a specialist biocide at low pressure. The tiles are never blasted, never undermined and never knocked loose — so your roof is left clean and protected rather than weakened.
Scrape then treat — moss that stays gone
We start by physically removing the bulk of the moss from the tiles, then clear the gutters and valleys of the fallen debris so water can run freely again. With the heavy growth gone, we apply a biocide that kills the remaining spores and lichen, so regrowth is dramatically slowed rather than simply scraped off to return within a season.
Over the following months the roof continues to clean itself naturally as the treated, dead growth weathers and washes away. The finish keeps improving long after we have left — and an optional annual top-up keeps the roof clear for good.
Safety & access
Working at height is done safely, with the right access equipment and full insurance — including public liability cover. We assess every roof before we begin, and where it is the safer or more practical option we treat from the ground or from a scaffold tower rather than walking the tiles. Either way, the job is carried out by trained operatives who do this every week, not chanced by someone balancing a ladder against a gutter.
What's included
- Full roof survey, checking pitch, access, tile type and moss volume
- Manual moss removal across the affected slopes
- Gutter and valley clear of fallen moss debris
- Biocide softwash treatment to kill remaining spores and lichen
- Ground tidy-up and bagging of all removed moss
- Before-and-after photos for your records
- Optional annual top-up to keep regrowth away
What does roof cleaning cost in Chelmsford?
Honestly, it depends — the size and height of your property, how heavy the staining or moss is, access, and any extras all affect it, so we price every job individually rather than quote a figure that might not fit. Tell us about your job and we'll send a clear, free, no-obligation price, usually the same day. See how our pricing works.
Frequently asked questions
Should a roof ever be pressure washed?
No. High pressure strips the protective surface off concrete tiles, drives water underneath them and can dislodge tiles altogether — drastically shortening the life of the roof. The correct method is manual moss removal followed by a biocide softwash, which clears the moss and kills the spores without ever putting the roof at risk.
Will the moss come back?
Not for a long time. After we physically scrape off the bulk of the moss, we apply a biocide that kills the remaining spores and lichen, so regrowth is dramatically slowed. The roof then continues to clean itself naturally over the following months as the dead growth weathers away. An optional annual top-up keeps it clear indefinitely.
Is it safe for my tiles?
Yes. We never jet-wash, so there is no risk of stripping the tile surface, forcing water under the tiles or dislodging them. Moss is removed by hand and treated with a correctly diluted biocide. We work at height safely with the right equipment and full insurance, and treat some roofs from the ground or a scaffold tower where appropriate.
How much does roof cleaning cost?
It depends on your property — the size and height, how heavy the staining or moss is, and access all affect it. Send a photo and your postcode and we'll give you a free, no-obligation price, usually the same day.