
from £35/session
Moss and green algae build up quietly on north-facing roof slopes, and by the time it's visible from the street it's often been growing for a year or more. A roof cleaner working in Comber will usually start with a walk-round inspection before deciding whether the job needs a simple wash or a full moss removal and biocide treatment, particularly on older properties with heavier tile coverage.
Most local tradespeople quoting for Comber also cover Bangor, Holywood and Newtownards, so if you're gathering a few quotes it's worth asking whether they can bundle nearby jobs to bring the price down.
Post your details once and let roof cleaners in the area come to you with quotes, rather than ringing round individually and repeating the same description of your roof each time. It's also worth checking whether the quoted price includes clearing debris from the gutters and the ground once the job is finished.
Bark's data suggests jobs typically fall between £400 and £1,000, or around £8.50 to £14 per square metre. Actual cost depends on roof size, access, and whether it's a manual scrape and biocide treatment or a full steam clean.