How Often Should You Have Your Roof Cleaned?

It's one of the most common questions we get asked — and the honest answer is that most South East homeowners leave it far too long. By the time moss is clearly visible from the street, it's usually been quietly damaging your roof for years.

Every 2 to 3 years is the general rule

For most properties in Kent, Sussex, and Surrey, a professional roof clean every two to three years is a sensible maintenance schedule. The South East's damp climate and tree coverage create ideal conditions for moss, lichen, and algae to establish quickly — particularly on north-facing roof slopes that get less sun.

If your property is surrounded by trees, sits in a shaded area, or has a shallow-pitched roof, you may need to clean more frequently. These conditions accelerate growth significantly.

What happens if you leave it

Moss isn't just unsightly. It holds moisture against your tiles, works its way into small cracks, and expands when it freezes in winter. Over time this lifts and loosens tiles, lets water into the roof structure, and leads to the kind of repair bills that make a regular clean look very good value indeed.

Lichen is even more stubborn — it bonds directly to the tile surface and causes surface erosion that shortens the life of the roof considerably.

A biocide treatment extends the time between cleans

After every roof clean, we apply a professional biocide treatment that kills off any remaining spores and inhibits regrowth. This can extend the time between cleans significantly — many customers in Kent and Sussex find they can go three to four years between treatments with this in place.

Not sure when yours was last done?

If you can't remember the last time your roof was cleaned — or you've never had it done — it's worth getting it looked at. We offer free surveys across Kent, Sussex, and Surrey and will give you an honest assessment of what's needed, with no obligation to book.