Read this to understand what a cleaning price depends on, how to compare two quotes fairly, and what to have ready before anyone visits, so the figure you are given fits your roof.
Ask three people what a roof clean should cost and you will hear three different numbers, each of them sincere. A terrace with a low back slope and a detached house with three storeys of wall below the eaves are both described as roof cleaning, yet the second takes far longer and needs far more equipment.
That is why a flat figure given over the phone, or printed on a flyer, tells you little about your own house. What decides the price is a short list of things, and every one of them can be seen on a visit or judged from photos. Once you know the list, you can work out why two quotes differ, and you can see what to ask when one looks much lower than the other.
This guide sets out the list, explains how to compare quotes without being misled, and describes what happens before a price is given. The work itself is described on our roof cleaning and moss removal page, and the cost is one total, in writing, after the survey.
How much should you pay to have a roof cleaned?
The short answer is that the right price is the one written after someone has looked at your roof, and a fair price fits what they found. A figure quoted without a look is a guess, and guesses either leave out part of the job or add a margin for the unknown.
Cleaning is priced after a survey for a practical reason. Two roofs of the same footprint can differ by a large amount of work, and the difference is mostly out of sight from the pavement. Whether the slope is gentle or steep, how thick the growth is and whether the gutters are packed all change the hours, the equipment and the product.
A number worked out from a postcode or a floor area alone would be a guess, so the survey comes first, photos of the roof reach you, and one written total follows. If the survey shows that the tiles are failing, the advice may be that cleaning is the wrong spend and a repair comes first.
A fair price is also one you can explain, and an honest quote will carry a short note of what it assumes about the roof, so that you both know what would change it. After you have read this guide you should be able to look at a quote and say which of the factors below it reflects. If you cannot, ask. Any trader who has surveyed the roof can tell you what the total allows for.
Roof area, pitch and the number of slopes
The size of the roof is the first driver, and it is not just about square metres. A roof is cleaned slope by slope, and each slope needs its own approach, its own setting up and its own checking. A simple gable has two slopes. A house with a hip, a side extension, a bay and a porch has many more, and every junction is a place where moss collects and where care is needed.
Pitch matters as much as area. A steep slope is harder to work safely, so more of the time goes on getting a person into a secure position and less on the cleaning itself. A flat or low-pitched section may seem easy but has its own limits: a walking surface is not always a safe one, and some coverings are not suited to being walked on.
The factors that come under area and shape are these:
- the number of separate slopes, not only the footprint of the house
- how steep each slope is, and how far it runs from ridge to eaves
- extra roofs such as a porch, a dormer, a garage or an outbuilding
- valleys, chimneys and abutments, where growth builds and detail work is needed
You can help by sending a photo of every roof you want included, since a garage or a lean-to is easily forgotten and then has to be added.
Access and where the scaffold stands
Getting to the roof safely can weigh heavily on the price. A low bungalow with open sides can be reached from a tower or a long ladder with a stabiliser. A tall terrace with a front door on the pavement may need a full scaffold, and a scaffold on or over the highway needs a licence.
The licence for a scaffold on the highway comes from Kent County Council under section 169 of the Highways Act 1980, and the scaffolding company makes the application. The council's fee is £52 per week for 2026 to 2027, with 5 working days of notice needed. Our answer on the Kent scaffold licence covers the process. A roof with open ground on every side avoids all of that, so the same clean can cost less on one house than on its neighbour. The reverse also holds: a roof that looks plain from the street can sit behind a narrow lane where nothing larger than a hand trolley will pass, and that is worth saying at the first call.
| Situation | Effect on the job |
|---|---|
| Open garden around the house | Tower or ladder is simple to place |
| Front wall on the pavement | Licence and scaffold may be needed |
| Narrow side passage | Equipment is carried by hand |
| Conservatory or extension in the way | Reaching the roof behind takes longer |
Our guide on roof cleaning access shows what each setup looks like.
Method, growth and the state of the tiles
How the roof is cleaned shapes the price as well. A gentle clean takes time: hand removal of the thick growth, a treatment applied to the label, a pause for it to work and a final clear-up. A faster, harder method may look cheaper on paper, but a hard jet risks stripping the tile face, and Marley links that kind of surface damage to a much shorter life for the tile. The method you are quoted for is worth asking about.
The amount of growth is the next factor. A roof with a light film and some lichen takes a different job from one under a thick cushion of moss in every lap. Heavy moss means more to take off, more to carry away and more to clear from the gutters.
The state of the tiles decides whether cleaning is sensible at all. Cracked, slipped or soft tiles are found when the growth comes off, and each one is a decision: leave it, replace it or stop and talk to you. A good survey finds many of them first, which keeps the price from changing on the day. Where one turns up that the survey could not see, you are told before anything is done about it, and the choice is yours.
Roof coverings also vary. Our guides on cleaning concrete roof tiles and cleaning a slate roof set out how the surface affects the method. A quote that does not mention the covering has not looked at it. A smooth, dense surface and a rough, porous one take a treatment differently, and the time each needs is different too.
Gutters, waste and the finishing work
The gutters are part of a roof clean because moss comes off the roof and lands in them. A run of clear gutters takes little time. A run packed with sludge, or a plugged downpipe, adds work. A Which? Trusted Traders survey from November 2025 puts a typical UK range of £75 to £350, excluding VAT, on clearing every gutter at the front and rear of a house. Our guide on roof moss and blocked gutters covers it in detail.
Waste is the other part to check. What comes off the roof has to be bagged, carried down and taken away, and a roof that has shed a lot of growth gives a lot to remove. Tidy sites and waste taken away are part of how we work, and a quote that does not mention disposal is worth a question.
The finishing work takes in:
- a check of the roof after the treatment, with photos of the result
- clearing the gutters and downpipes of what came off the tiles
- sweeping paths, patios and the garden of debris
- protecting plants and water butts from run-off during the work
None of these is glamorous, and all of them are what separates a finished job from a half-finished one. They take real time on site, and that time, which no one sees from the road, is part of the price, which is one more reason a quote that looks very low deserves a question or two.
Comparing quotes, and getting one written price
When quotes arrive, set them side by side on the same basis. Citizens Advice recommends collecting at least 3 written quotes before choosing a trader, and a roof clean is a job where that is easy to do. The important point is that the quotes describe the same work.
Questions that bring the differences out:
- Is the price for the whole roof, including porch, garage and outbuildings?
- Does it include VAT, and is access covered, including any scaffold?
- Which method is used, and is a treatment applied to the product label?
- Are the gutters and downpipes cleared as part of it?
- Is the waste taken away, and is the site left tidy?
HomeBuilding's cost guide finds labour dearer in London and across the wider region, and Kent belongs to it. Which? makes a similar point about the prices in its own guide. A figure from a national website is therefore a place to begin, not a price for your roof.
Our own route is simple. You send photos or book a look, we survey the roof, and one written total arrives. Nothing is added on the day. If cleaning is not what the roof needs, you are told straight away, and the survey is not wasted: the photos show you what state the tiles are in whoever does the work next. The guide to how long roof cleaning takes shows what the days will look like, from setting up access to the clear-up at the end.
