
£130/session
from £75/one off
Green patches and dark streaks on a roof are usually moss and algae, and they don't stay put once established. Left alone, the growth traps moisture against tiles and slates rather than letting rain run off, which isn't good for the roof over the long term.
Moss spores spread easily on the wind and settle wherever a roof stays damp and shaded, so even a roof that's just been cleaned can show fresh growth within a year or two without a preventive treatment.
A standard house roof usually takes a professional crew around a day, longer if there's heavy moss cover or scaffolding is needed. Roof cleaners covering Tewkesbury also generally work across Cheltenham, Gloucester, Cirencester and Stoke Gifford.
Drier spells in spring or autumn give biocide treatments the best chance to work before rain washes them off, though many firms take bookings year round.
Bark's data suggests roof cleaning in Tewkesbury typically costs £400 to £1,000 per job, roughly £8.50 to £14 per square metre. The final price depends on roof size, access, and whether it's a manual scrape and biocide treatment or a full steam clean.