Case Study: Executive Detached, Heavy Moss Removal

Property:
Large executive detached, concrete tile roof

Condition:
Severe moss (60–80% coverage), organic staining on north-facing slopes

Scope:
Full soft-wash biocide treatment + gutter clearance + full moss removal

Duration:
One full day on site, plus follow-up gutter check

Typical price:
£850 – £1,200 typical for this size and condition

Guarantee:
5-year biocide guarantee (partner-issued)

The Property

A large executive detached property in Hampshire — concrete tile roof, north-facing slopes heavily shaded by mature trees. The homeowner contacted us after noticing loose moss on the driveway and lifted debris in the gutters — classic signs of a roof that’s been left too long.

The Condition

Photos from the initial site visit showed severe moss build-up across roughly 60–80% of the roof surface, with the heaviest concentration on the shaded rear elevations. Organic streaking — the black-brown biofilm caused by algae — had spread across the more exposed slopes. Left another 2–3 years, freeze-thaw damage to tile edges would have become likely.

The Approach

Our matched delivery partner recommended a full soft-wash treatment rather than any form of pressure washing. On a moss load this heavy, high-pressure water would strip the aggregate coating from the concrete tiles and shorten their remaining life by decades. Instead:

Physical moss removal by hand and telescopic pole — carefully worked to avoid dislodging ridge tiles
Biocide application across the entire roof using a low-pressure soft-wash system
Full gutter clearance to remove dislodged moss and organic debris
Downpipe flush to confirm free flow after the clean

The Result

After a single full day on site the roof was restored to a clean, uniform finish across all slopes. The biocide continues to work for weeks after the visit, gradually killing off the last of the algae and preventing regrowth. Under our partner’s 5-year biocide guarantee, the roof should stay visibly clean for at least that long.

Timeline

Quote provided within 24 hours of receiving photos via WhatsApp. Work carried out on a mutually convenient weekday, weather-permitting. Full clean completed in one day; follow-up gutter check the following morning.

Typical Cost

Jobs of this size and condition (large executive property with heavy moss) typically fall in the £850–£1,200 range. Your exact quote is confirmed by the matched partner after photos or a short site visit.

Photos

Photos from our partner network. Each caption tells you exactly what you’re looking at — whether it’s this property, or a matched-tile close-up, or a method illustration from a comparable job. We don’t pretend two different houses are the same house.