The short answer
Most UK homeowners pay between £400 and £1,200 for a full professional roof clean in 2026. A 3-bed semi typically lands around £450–£650; a large 4-bed detached around £700–£950. Bungalows are cheapest at £350–£500. Anything quoted below £300 for a full house roof is either a scrape-only (not a proper clean) or a doorstep trader you should walk away from.
UK roof cleaning price table
Realistic 2026 prices for a full soft-wash clean including biocide treatment. The right-hand column is the typical surcharge if the roof has heavy moss and lichen that needs scraping first.
| Property type | Soft-wash + biocide | Heavy moss surcharge |
|---|---|---|
| Bungalow (90–110m² roof) | £350–£500 | +£100–£200 |
| 3-bed semi (110–140m²) | £450–£650 | +£150–£250 |
| 4-bed detached (140–180m²) | £700–£950 | +£200–£350 |
| Large detached (180m²+) | £900–£1,200 | +£250–£400 |
| 3-storey townhouse | £800–£1,100 | +£200–£400 |
Prices are typical UK ranges for 2026; central Scotland sits roughly in the middle of this range. London and the South East tend to run 15–25% higher.
What affects the cost of roof cleaning?
Six things genuinely move the price — most quotes that look surprisingly high or low can be explained by one or two of these.
Roof size (m²)
The single biggest driver. Most reputable cleaners price per square metre internally even if the quote looks like a flat fee. A 180m² detached is roughly double the work of a 90m² bungalow — and the quote should reflect that.
Pitch and height
Steep pitches (40°+) and 3-storey properties need more access equipment and slower working — usually adds 20–40% over a standard 2-storey job at the same square metreage.
Tile type
Concrete tiles (Marley, Redland) are the cheapest to clean. Natural slate and clay tiles need a gentler soft-wash approach and are typically 10–20% more. Flat roofs are quoted differently again.
Moss and lichen load
A roof with a full moss carpet on the north slope takes hours longer to scrape and treat than a light surface dirt clean. Heavy moss can add £200–£400 to a job.
Access
Scaffold-free working from the ground or ridge is the standard cost. Towers add £150–£300; full scaffold adds £400–£800. Confirm whether scaffolding is included in any quote you compare.
Biocide treatment
A proper post-clean biocide adds £80–£200 but extends the visible cleanliness of the roof from ~18 months to 5+ years. Almost always worth it; a quote without biocide is usually false economy.
Soft wash vs pressure wash — which is cheaper?
Soft washing and pressure washing cost roughly the same on the day. The difference is what happens to your roof afterwards. High-pressure washing forces water under the tile lap (which can cause leaks), strips the protective surface coating from concrete tiles (which accelerates re-mossing), and can crack older slate or clay tile outright. The repair cost from a poorly pressure-washed roof routinely runs into the thousands.
No professional roof cleaner in the UK uses high pressure on residential tile. If a quote is suspiciously cheap and mentions "jet washing" the roof, that's the reason — and it's a quote to refuse.
How much does roof moss removal cost?
Moss removal as a standalone service usually runs £250–£600. But "scrape only" is a short-term fix — the roof will look better for a season, then moss returns by the following winter because the spores remain. The longer-lasting option is a full soft-wash with biocide treatment at £400–£900, which kills the moss at the root and prevents regrowth for years.
In wetter parts of the UK (the west of Scotland, Lake District, west Wales, Cornwall), skipping the biocide is genuinely false economy. North-facing slopes will green over within 12 months in those climates.
How to avoid being overcharged (or scammed)
- Always get the quote in writing before any work starts. Verbal-only quotes are a classic doorstep tactic.
- Check the cleaner is fully insured for working at height — ask for the certificate. £2m public liability is standard.
- Avoid anyone who knocks on your door offering a 'today only' price on roof cleaning. Reputable cleaners are booked weeks in advance.
- Ask whether biocide treatment is included in the price. If not, the price comparison isn't like-for-like.
- Ask for before/after photos of recent jobs — every legitimate roof cleaner has hundreds.
- Be cautious of any quote that requires a large cash deposit upfront. Most professional firms invoice on completion.
Frequently asked questions
How much does roof cleaning cost in the UK?
Most UK roof cleans fall between £400 and £1,200. A typical 3-bed semi sits around £450–£650, larger 4-bed detached homes £700–£950, and bungalows around £350–£500. Heavy moss, steep pitches, scaffolding, or three-storey access push prices toward the top of the range.
What affects the price of a roof clean?
Five things matter most: roof size in square metres, pitch and height, tile type (concrete tile, clay, slate), how much moss and lichen is present, and access (scaffolding vs ladder vs ground-based equipment). A simple bungalow with a ground-accessible roof is the cheapest combination; a steep 3-storey detached with heavy moss is the most expensive.
How much does moss removal from a roof cost?
On its own, moss scraping usually runs £250–£600 depending on roof size and how thick the moss is. Most reputable cleaners price moss removal as part of a full soft-wash service (scrape + soft wash + biocide) at £400–£900 — better value than scraping alone, because untreated tiles re-moss within a year.
Is soft washing cheaper than pressure washing a roof?
Soft washing is similar in cost but vastly safer for the roof. High-pressure washing can crack tiles, strip the protective coating from concrete tiles, and force water under the lap — all of which lead to leaks and far bigger bills later. No reputable roof cleaner uses high pressure on tiles. Soft wash + biocide is the industry-standard method.
How often should a roof be cleaned?
With a proper biocide treatment as part of the clean, most UK roofs only need re-cleaning every 5–7 years. Without biocide, expect visible moss back within 12–18 months. A periodic biocide-only top-up at year 2 or 3 (around £150–£250) extends the life of the original clean substantially.
Do I need scaffolding for a roof clean?
Usually no. Most pitched residential roofs are cleaned safely from the ridge with proper roof ladders and fall-arrest equipment, or from the ground using soft-wash systems. Scaffolding is only needed for very steep pitches, three-storey access, or unusual geometry. A scaffold tower or full scaffold adds £300–£800 to a job.
Want a proper roof cleaning quote?
We cover Glasgow, East Kilbride, Hamilton, Motherwell, Paisley and Rutherglen — all quotes are fixed in writing, no callout fee, and fully insured. Soft wash and biocide as standard.