Farnham · GU9 / GU10
Farnham biocide treatment done the right way
We cover Farnham on biocide treatment from our base in Petersfield, and we know the town well enough to price it properly rather than guess. Farnham has a strong heritage roofscape of handmade clay tiles and Welsh slate, alongside 20th-century interlocking tile suburbs to the east and north.
Why Farnham roofs need biocide treatment done carefully
We cover Farnham on biocide treatment from our base in Petersfield, and we know the town well enough to price it properly rather than guess. Farnham has a strong heritage roofscape of handmade clay tiles and Welsh slate, alongside 20th-century interlocking tile suburbs to the east and north. That's why one street off Castle Street might need a full scrape-and-treat while another needs only a light soft-wash pass. We also handle Godalming and Guildford on the same trips, so trades don't sit idle between jobs.
Products & kit we use
Matched to the tile stock you actually get in GU9 and GU10 — Georgian Castle Street houses and Edwardian villas.
Why Farnham owners pick us
- Kills algae and lichen at the root
- Slows regrowth for three to five years
- Applied at full strength, no dilution tricks
- Ideal add-on after a manual clean
- £5,000,000 public liability public liability — no surprises on Farnham jobs.
Our process in Farnham
- 1
Biocide is applied as a soft-wash spray across every pitch, saturating the tile surface so spores are killed at the root.
- 2
We time treatment for a dry weather window so the biocide has hours on the tile before any rain washes it off.
- 3
Elevations under heavy tree shade get a second pass — that's where regrowth always starts first.
- 4
We don't cheat by watering biocide down; the strength we quote is the strength we apply.
What we see on Farnham roofs
Farnham has a strong heritage roofscape of handmade clay tiles and Welsh slate, alongside 20th-century interlocking tile suburbs to the east and north.
algae returning within months of a manual clean
Common on Georgian Castle Street houses where prevailing weather sits against the pitch.
black streaking rebuilding on shaded pitches
Frequently reported by owners near Castle Street.
lichen re-establishing on ridge tiles
Especially where mature trees over the market town area shed onto the roof.
green film across the whole slope after wet winters
Typical of properties served by the A31 where road dust binds with damp.
Nearby areas we also cover
Farnham is on our regular biocide treatment route, so we cover these surrounding areas on the same week:
Recent biocide treatment work near Farnham
Farnham biocide treatment FAQs
How often should biocide be reapplied — is that the same in Farnham?
Every three to five years is normal, sooner if your property is under heavy tree cover or close to the coast. In Farnham specifically, sitting in the wey valley, farnham roofs experience heavy autumn leaf fall from mature street trees, so we plan the visit around that.
Will the roof look different straight away — is that the same in Farnham?
No — biocide kills algae and lichen at the root, and the dead growth then weathers off over the following months, gradually revealing clean tile. In Farnham specifically, sitting in the wey valley, farnham roofs experience heavy autumn leaf fall from mature street trees, so we plan the visit around that.
Do I need to clean the roof first — is that the same in Farnham?
For heavy moss and lichen, yes — biocide works best on a physically clean surface, so we usually pair it with a scrape-and-clean visit. In Farnham specifically, sitting in the wey valley, farnham roofs experience heavy autumn leaf fall from mature street trees, so we plan the visit around that.
Do you cover the whole of Farnham and the GU9 / GU10 postcode?
Yes — we cover every part of Farnham, from streets close to Castle Street out to the edges bordering Godalming. If you're inside GU9 or GU10, we'll be there.
Do you also work in nearby areas like Godalming and Guildford?
Yes — Godalming (about 8 miles away), Guildford (about 11 miles away), Haslemere (about 10 miles away) are all part of the same regular route, so we can often combine visits with neighbours on the same street.
In short — Biocide Treatment in Farnham
The takeaway for Farnham property owners is simple. Biocide Treatment isn't optional maintenance — it's the difference between a roof that lasts its full design life and one that fails a decade early. Book a survey, get the honest picture, decide from there.
Free biocide treatment quote — Farnham
Send us the address and a couple of phone photos. We'll come back with a proper written price — not a guess over the phone — usually within one working day.