Roof Cleaning & Moss Removal in Cambridge & Cambridgeshire

No — and we strongly advise against it. High-pressure washing strips the protective surface from concrete tiles, accelerating their porosity and dramatically shortening their remaining serviceable life. On natural slate, pressure washing cracks fragile tile edges and forces water into the roof at the laps. On any roof type, the force of a pressure washer can dislodge tiles, loosen ridge mortar and drive water through fixings. We never use high-pressure washing. We use soft wash systems and manual methods that clean the roof effectively without causing damage — and we will always tell you which method is appropriate for your specific roof before starting.

Most roofs benefit from cleaning every 3 to 5 years, though in Cambridge and Cambridgeshire the interval is often shorter. Properties in heavily tree-lined streets — common in Newnham, Chesterton, Trumpington and the older village centres across the county — and those with north or east-facing roof slopes will typically see significant moss regrowth within 2 to 3 years of cleaning, particularly if no biocide treatment was applied. Following a professional clean and biocide treatment, we would suggest inspecting the roof annually and cleaning again when moss coverage begins to re-establish, rather than waiting for a fixed interval that may not reflect your specific conditions.

Yes — moss and algae will always return eventually on most roofs, particularly in the damp Fenland climate of Cambridgeshire. The key is slowing regrowth to the point where the interval between cleans is measured in years rather than months. We apply a professional biocide treatment after every roof clean, which kills residual spores and algae that manual cleaning does not reach and significantly slows regrowth. On porous concrete tile roofs — common across Cambridgeshire's post-war housing stock — regrowth is faster because the surface provides better anchorage for moss. On these roofs, biocide treatment is particularly important. We will give you a realistic expectation of regrowth rate for your specific roof type and location at the time of the clean.

Yes — cleaning older roofs is a significant part of our work in Cambridge, given the city's large stock of Victorian and Edwardian properties with natural slate and clay plain tile roofs. For these roofs, we use manual cleaning methods with soft brushes rather than any form of water pressure — even soft wash pressures can loosen slate fixings on older roofs where the nails have corroded over time. We also take care on conservation area and listed properties where the condition and appearance of original roofing materials matters. We will always assess the roof and agree on the method before starting, and we will advise honestly if we find any underlying issues that need addressing as part of the inspection.

Yes — in several ways. Thick moss holds moisture against the tile surface continuously, which on concrete tiles accelerates surface erosion and on any tile type increases freeze-thaw damage in winter, when water trapped in the moss expands as it freezes and exerts pressure on tile edges. Moss growth also works under tile laps and edges, physically lifting them over time and creating gaps through which water can enter. Clearing moss from valleys and ridges restores proper drainage and reduces the risk of water pooling. Regular cleaning does not replace eventual tile or roof replacement, but it can meaningfully extend the remaining serviceable life of a roof that is otherwise structurally sound.

Yes — all roof cleaning quotes across Cambridge and Cambridgeshire are free with no obligation. For most jobs we will want to see the roof before quoting, as the appropriate cleaning method, the amount of moss present and the time required all affect the price and can only be properly assessed in person. We will confirm which method is appropriate for your roof, give you a clear fixed price before starting, and carry out a full inspection at the same time. Call 01223 258 150 or use the contact form to arrange a visit.

Roof cleaning costs vary depending on the size of the roof, the severity of moss growth, the roof type and the method required. As a general guide, a standard semi-detached property in Cambridge typically starts from around £300–£500 for a full moss removal, soft wash and biocide treatment, with larger or more complex properties priced accordingly. Roofs requiring manual cleaning due to age or material type may be priced differently. We provide free, fixed-price quotes so you know the exact cost before any work begins — call 01223 258 150 or use the contact form.

Yes — biocide treatment is applied after every roof clean we carry out. Manual removal and soft washing clean the visible moss and algae from the tile surface, but spores and residual algae remain embedded in the tile surface and will re-establish rapidly without a biocide treatment. The biocide we use is a professional-grade product that kills residual growth and continues to inhibit regrowth for an extended period after application. It is safe for gutters, gardens and surrounding surfaces when applied and rinsed correctly. We include biocide treatment as standard in all our roof cleaning jobs across Cambridge and Cambridgeshire — it is not an optional add-on.