Roof Cleaning Cost UK: 2026 Prices and What Changes the Quote
Published UK cost guides put a professional roof clean at roughly £400 to £1,200 for most homes, with a typical three-bed semi landing around £450 to £650 for a soft wash with biocide treatment. London and the South East usually run 15 to 25 per cent above the national figures.
If you're pricing this up, you've probably already had the confusing bit. One company quotes £350, another £900, and a man with a jet wash knocks and offers to do it this afternoon for cash. Three numbers, three very different jobs. Here's what a proper roof clean should cost, what moves the price, and how to tell which quote is actually the honest one.
How much does roof cleaning cost in the UK?
The guides all land in the same neighbourhood, so these ranges are a fair picture of the 2026 market:
- Bungalow: roughly £350 to £500
- Terraced house: roughly £400 to £550
- Semi-detached: roughly £450 to £650
- Detached house: roughly £550 to £950
- Large detached (180 m² and up): roughly £900 to £1,200
- Per square metre: roughly £8 to £20 depending on the method
Most guides put the overall average around £475 to £575 for a semi with decent access, and the job typically takes three to seven hours.
A quote well under £300 usually means a quick scrape with no treatment, or someone you don't want on your roof at all. More on that below.
Roof moss removal cost
If moss is the actual problem, published guides break the roof moss removal cost down by method:
- Manual scrape only: roughly £250 to £600 on an average house
- Scrape plus biocide treatment: roughly £550 to £900 on a semi
- Full soft wash including moss removal: roughly £400 to £900
The scrape-only price looks tempting until you realise nothing has been killed. The roots and spores are still in the tiles, and the moss starts back within months. Paying for the treatment on top is what turns a clean roof into one that stays clean.
What moves the price up or down
Two houses on the same street can be £300 apart, and both quotes can be fair. These are the things that shift the number:
- Roof size and pitch. Bigger roofs cost more, obviously, but steep pitches cost more per square metre because everything takes longer and needs more kit. A shallow-pitch semi is a different job from a steep Victorian terrace with hips and valleys.
- Tile type. Concrete tiles are tough and quick to work on. Clay tiles and slate are fragile, need gentler handling and a slower method, and guides put them 10 to 20 per cent higher.
- Access. This is the big one. If the roof can't be reached safely from the ground or a tower, scaffolding goes on the quote, and published guides put scaffold hire at roughly £250 for a tower up to £800 or £900 for full scaffolding. That can double the price of the whole job.
- How much moss there is. A light green film is a quick treatment. A thick mat you can't see tile through adds £150 to £400 on most guides, because the heavy growth has to come off before any treatment goes on.
- Biocide treatment. Sometimes included, sometimes an extra at roughly £80 to £300. Always ask which it is, because this is where quotes that look £200 apart turn out to be the same job.
- Gutter clear-out after. Dead moss keeps washing down for weeks after a treatment, and guides put a gutter clear at roughly £75 to £200 if it's priced separately.
On access, it's worth knowing the Work at Height Regulations 2005 put working from the ground first: employers must make sure work isn't done at height where it's reasonably practicable to do it safely another way. That's the law for businesses, but it's also just a sensible way to think about your own house. Our ground-based roof cleaning and moss removal works from below with a telescopic system, so there's nobody on your tiles and no scaffold to hire.
Why the cheapest quote usually means a jet wash
High-pressure blasting is fast, and fast is cheap. It's also the method the people who make your tiles warn against.
Marley, the UK roof tile manufacturer, says in its guidance on moss and lichen that high-pressure washing "can damage roof tiles, particularly older or more delicate ones", and that the upward movement of the spray "can also lift and damage the tiles". The same guidance notes pressure washing is "not recommended by most roofing professionals".
The physics is simple. Tiles overlap so rain runs down and off. A jet fired up the slope pushes water under those overlaps, floods the roof and can strip the surface off the tile, which then weathers faster and holds moss sooner. If your tiles are still under a manufacturer's guarantee, it's worth checking the terms before you let anyone blast them, because the manufacturer's own guidance warns against the method.
We've written a full guide on how to remove moss from a roof without wrecking the tiles. The short version: scrape the heavy growth, kill what's left, and keep the jet wash for the driveway.
What a soft wash is, and what it costs
Soft washing is the alternative the guides favour. The treatment does the work rather than the force of the water: moss, lichen and algae are killed at the root, the heavy clumps come away on the day, and the dead growth washes down with the weather over the following weeks.
Published guides put roof soft wash cost at roughly £10 to £20 per square metre, so a typical semi lands around £450 to £650 all in. It costs more than the bloke with the jet wash. It also doesn't crack your tiles, which is rather the point.
Moss killer has rules, and your quote should follow them
A biocide for roofs isn't just another cleaning product. In Great Britain it's regulated.
HSE's guidance on product requirements states that "the control of moss is regulated under the GB and EU Plant Protection Products Regulations", and that any product making claims against moss has to be authorised under them. So the treatment going on your roof should be an authorised product, used at the dose on its label.
So the treatment going on your roof should be an authorised product, used at the dose on its label. And if a company can't tell you what it's spraying, it probably shouldn't be spraying it.
The questions to ask before you let anyone up there
This is the part most cost guides skip, and it's where the money is actually protected. Before you accept any quote, ask:
- What method, exactly? "Clean the roof" is not a method. Scrape and biocide, soft wash, or jet wash are. If the answer is pressure washing, that £350 quote is about to get expensive in other ways.
- Will anyone be walking on the roof? HSE describes all roof work as highly dangerous, "even if a job only takes a few minutes", and says almost one in five deaths in construction work involve roof work. A ground-based method avoids the risk to the person and the foot damage to your tiles.
- Is the biocide included, and is it an authorised product? Two quotes can only be compared once you know both include the treatment.
- Is the gutter clear-out included afterwards? All that dead moss is going somewhere. If the quote stops at the ridge, you'll be paying again in a month.
- What access is included? Ladders, tower, full scaffold, or none at all. Scaffold arriving unannounced on the morning is not a fun surprise at £800.
- Are you insured for roof work, and what training do you have? Insurance matters on any job at height. Our own team is BWCA approved and trained, and we'd expect any company quoting you to answer this one without blinking.
- Is the quote fixed, in writing, before work starts? Yes or no.
Any company that gets shirty at these questions has answered them.
How long does a roof clean last?
Honestly? It depends on your trees and your shade, not on anyone's promise.
Guides generally reckon a scrape alone buys you months, not years, because nothing has been killed. A proper scrape and biocide or a soft wash typically holds for two to three years, and some claim longer. Be wary of anyone guaranteeing a moss-free roof for a fixed number of years. North-facing slopes, overhanging branches and shallow pitches decide how fast it comes back, and no cleaner controls those.
What does help: keeping gutters clear so wet leaves don't sit against the bottom row of tiles, and cutting back branches that shade the roof. The run-off from any treatment matters too. HSE's advice on using pesticides at home is to always use them as instructed on the label and never pour them down a drain or drainage system, because of the risk of contaminating water and harming wildlife. Your gutters and downpipes are a drainage system, so an over-strong mix on the roof ends up in the flowerbeds.
For the gutter side, our guide on how often gutters should be cleaned covers it properly, because a clean roof feeding a blocked gutter still ends with water down your wall. If you'd like both sorted in one visit, our gutter clearing service pairs naturally with a roof treatment.
When it isn't worth paying at all
We'd rather tell you than take the money.
If the growth is a thin green film on a sound roof and the gutters run clear, leave it. That's Marley's advice and it's ours. If the roof is being replaced in the next couple of years, don't pay to clean tiles that are coming off. And if tiles are cracked, slipped or missing under the moss, you need a roofer first, not a cleaner. Cleaning comes second.
FAQ
How much does roof cleaning cost in the UK? Published cost guides put most homes at roughly £400 to £1,200, with a typical three-bed semi around £450 to £650 for a soft wash with biocide. London and the South East usually run 15 to 25 per cent higher.
How much does roof moss removal cost? Guides put a manual scrape at roughly £250 to £600 on an average house, and a scrape plus biocide treatment at roughly £550 to £900 on a semi. The treatment is what stops the moss coming straight back.
Is it worth getting your roof professionally cleaned? If there's heavy moss, yes. It holds water on the tiles, makes leaks more likely and keeps blocking your gutters. A thin film on a sound roof is usually fine to leave, and tile manufacturer Marley says the same.
Does roof cleaning include the gutters? Sometimes, sometimes not. Dead moss washes down for weeks after a treatment, so ask whether a gutter clear-out is included or priced separately before you compare quotes.
Do you need scaffolding to clean a roof? Not always. Ground-based systems work from below with no scaffold and nobody on the tiles. Where scaffold is genuinely needed, guides put it at roughly £250 for a tower up to £900 for full scaffolding.
How long does roof cleaning take? Most guides say three to seven hours for an average house, with large or heavy-moss roofs taking a day or two. The treatment keeps working for weeks after the visit itself.
Get a real number for your roof
Every range in this post is a market figure, and your roof is a specific one. Send us a photo from the street or the end of the garden, and we'll tell you honestly whether it needs doing, what method suits it, and what it would cost. If it's a light film on a sound roof, we'll tell you to leave it.
Our roof cleaning service is ground-based, fully insured with £5 million public liability cover, and the team is BWCA approved and trained. The quote is free and there.s no obligation.
Get a free, no-obligation quote, call us on 07375 104665, or message us on WhatsApp at wa.me/447375104665 for a same-day answer. We cover North London and the Hertfordshire borders.
Last updated: 26 September 2026
About Techno Clean: a London deep-cleaning company covering North London and the Hertfordshire borders. We specialise in one-off deep cleans, end of tenancy and after builders cleaning, fully insured with £5 million public liability cover and DBS-checked teams, rated 4.9 from over 180 reviews across 500+ completed jobs.
