Why Reigate roofs need the gentle treatment, not the blaster
Right — if your Reigate roof has gone green and you’ve had a bloke knock on the door offering to “jet the moss off for a ton,” do me a favour and don’t. Reigate has a roof mix you don’t see everywhere: the older properties around the Old Town, Reigate Hill and Wray Lane carry natural slate and clay tile, often on period homes, and a fair few sit inside conservation areas. That’s exactly the stock you should never put a pressure washer near.
Here’s the thing most doorstep operators won’t tell you. Concrete and clay tiles have a protective surface layer applied at the factory. High pressure strips that off in one pass — the roof looks lovely for a season, then the tiles start drinking water, freeze-thaw cracking, and ageing years faster than they should. On natural slate it’s worse: slate is brittle, the lichen stains it badly, and a turbo nozzle will chip and split it. We soft-wash everything. Soft washing is a low-pressure cleaning method — typically under ~100 psi, a fraction of the 100–150 bar (1,500–2,200 psi) a domestic jet washer puts out — that relies on a biocide to kill moss, lichen and algae rather than on mechanical force to blast them off. Scrape the moss by hand, kill the rest with biocide, let nature finish the job.
The chalk-and-clay split, applied to your roof
Reigate is two postcodes in one. North of the High Street — Reigate Hill, Wray Lane, the chalk-scarp foot — the pitches sit in a drier, better-draining aspect, but they catch heavy tree shade from the mature beech and oak along the Downs. South of the High Street — Old Town, Priory Park, Woodhatch, South Park — you’re on the valley floor, higher humidity, and that’s where moss germination really gets going on a north-facing pitch.
What that means in plain English: a Reigate Hill roof and a Woodhatch roof 800m apart can be on different cleaning rhythms. The shaded valley-side pitches need looking at sooner; the drier hill aspects stretch out longer. We read the roof before we quote — pitch, aspect, tile type, moss density — rather than treating “a Reigate roof” as one thing.
What it costs to clean a roof in Reigate
Roof cleaning is a higher-ticket job than a driveway, so it attracts more cash-only doorstep operators with vague all-in numbers. A fair RH2 quote is written and itemised — roof size and pitch, tile type, access method, moss removal, biocide treatment and gutter clearance, each broken out so you can see what you’re paying for. Surrey sits in the higher-cost South East, so a Reigate roof landing at the upper end of the national bands is market reality, not a mark-up. The figures below are typical RH2 ranges (£15–£30 per m²); your exact number depends on access and how much moss is up there.
| Reigate property type | Typical roof | Price range |
|---|---|---|
| Old Town terrace / small semi | Clay or concrete tile | £800–£1,200 |
| Woodhatch / South Park semi-detached | Concrete tile | £1,000–£1,600 |
| Reigate Hill / Wray Lane detached | Clay tile / natural slate | £1,400–£2,000 |
| Heavy moss / steep pitch | Any | add 25–50% |
Priced from £15–£30 per square metre. Want a number for your exact roof? Try the cost calculator or get a written, no-obligation RH2 quote.
The warranty angle — the real reason to soft-wash in Reigate
This is the part the cheap operators skip. Major tile manufacturers advise against high-pressure washing of roof tiles — Marley, one of the UK’s best-known roof-tile makers, advises that jet washing can remove the protective surface finish from tiles (marley.co.uk). Blast a tile roof and you can undermine the manufacturer’s warranty — and on a Reigate Hill clay or heritage slate roof, a re-roof is not a small number. There’s also the safety angle: roof work is classed as work at height and must be planned and equipped under the Work at Height Regulations 2005 (HSE, hse.gov.uk), which is another reason it’s not a DIY pressure-washer job. Hand removal plus soft wash keeps the factory coating intact, keeps the warranty valid, and keeps the job defensible. We’d rather take the slow, safe route than save an hour and cost you a roof.
Conservation-area and heritage roofs
A good chunk of Reigate — the Old Town, parts of Reigate Hill — falls inside conservation areas, and there are listed properties dotted through it. Routine cleaning of a roof is unaffected by planning rules; it’s visible damage from the wrong technique that attracts enforcement. So on listed and conservation-area roofs we soft-wash only, and we never put pressure on natural slate from a heritage period property. If you’re unsure where your property sits, we’ll have a look before we touch anything.
Roof types we clean across RH2
Clay tile
Common on the older Reigate Hill and Old Town homes. Harder than concrete but more porous, so the lichen sits deeper — biocide does more of the work than scraping here.
Natural slate
The heritage and high-end Reigate roofs. Slate doesn’t hold moss like tile but lichen and algae stain it badly. Treated gently with biocide and very low pressure — never blasted.
Concrete tile
The standard across the 1930s-onwards estates through Woodhatch, South Park and Wray Common. Soft wash is essential to preserve the surface coating.
Flat roofs (felt, EPDM, fibreglass)
Garage extensions and dormer roofs around the newer Skimmington and Reigate Heath fringes. Different method entirely — we clear standing debris, treat algae, and check the drainage while we’re up there.
How long a Reigate roof clean lasts
3–5 years with a proper biocide treatment, versus only 6–12 months if a roof is just pressure-washed and left untreated. The difference is the residual inhibitor — the biocide kills the spores at root level and leaves a film that suppresses regrowth through the following seasons. A wash-only clean strips the green off but leaves the spores, so it’s back before you know it. North-facing valley-side pitches around Woodhatch and South Park regrow faster than the drier Reigate Hill aspects; on those we’d suggest a lighter biocide top-up between full cleans rather than waiting for the moss to take hold again.
Add-on: gutters & valleys cleared
The moss has to go somewhere. Most roof cleans naturally fill the gutters and valleys with debris — we clear them as part of the job, or you can book gutter cleaning separately. On a north-facing Reigate pitch that drops a lot of moss, this is the bit that stops it all washing back onto your paving.
Before & after
Areas we cover around Reigate
All of RH2 — Reigate Hill, Woodhatch, South Park, Wray Common, Reigate Heath, Skimmington and the Old Town — plus the rest of Surrey within 20 miles of our Redhill (RH1) base. That includes Reigate, Redhill, Banstead, Dorking and Horley. Reigate is one postcode west of us, so a same-day or next-day slot is realistic most weeks.
Helpful roof guides
- Roof cleaning across Surrey — the full service, methods and tile-type protocol.
- Does roof cleaning damage tiles? — soft wash vs pressure washing, and the warranty trap.
- How often should you clean your roof? — the right cadence by tile type and aspect.
