A roof clean is one of the cheaper jobs you can have done to a roof, and one of the easiest to overpay for or to underspecify. Prices vary because roofs vary: a two-bed bungalow with a single plain slope is not a four-bed detached house with dormers, a chimney and trees close to the eaves. This page gives the typical UK ranges that published cost guides report, explains what moves a price, and shows how to read a quote so you can compare like with like. The figure on your own quote follows the survey, because the roof sets the price and no average can.
The typical UK ranges
Two methods dominate the published figures, and they are reported by size of roof.
| Method | Small roof | Average roof | Large roof |
|---|---|---|---|
| Hand moss removal with biocide | £748 | £863 | £978 |
| Pressure washing | £553 | £638 | £723 |
These are typical UK ranges drawn from a published cost guide. They are a way to orient yourself, not a Beacon price list, and local prices differ. Scaffold, repairs, gutter work and extra treatments are not usually included in them.
The two methods are not equal in what they do. The pressure wash is cheaper because it is quicker, and it carries the highest risk to the roof, as we explain in our guide to high-pressure washing. The hand removal with biocide takes longer, kills the growth at the root and is gentler on the tile. The gap between them, as these figures show, is a few hundred pounds at most. On that evidence, saving the difference is a poor trade if your tiles suffer.
What moves a roof clean price
Size and shape of the roof
Area is the starting point, but shape counts as much. A simple gable roof is fast to treat. A hipped roof, valleys, dormers, a porch and an extension each add edges and details that take time. A large roof with a lot of obstacles may cost more than a bigger roof that is plain.
Pitch and access
A low-pitched roof can often be worked from ladders and a roof ladder. A steep or tall roof needs a tower or scaffold, which adds cost and time. Roofline scaffold is reported across a very wide band, £200 to £2,600, which tells you how much the house itself can matter. Our answer on whether roof cleaning needs scaffolding explains when it is called for, and the safety page covers the reasons.
How much growth there is
Light algae and lichen are quick to treat. Thick moss that fills the laps needs hand removal first, which takes hours. A neglected roof can cost more to clean than the same roof maintained, because the work is heavier and the disposal larger.
Type of covering
Fragile slates, handmade clay and brittle old concrete need care and slower, gentler methods. A modern machine-made tile tolerates more. Our comparison of cleaning slate, clay and concrete roofs explains how the covering changes the work.
Gutters and drainage
Clearing gutters and downpipes is part of a proper roof clean, as a clean sends debris into them. Heavily blocked or overgrown gutters take longer. What we find in them is described in the drainage guide.
Repairs found on the way
Moss hides slipped tiles, cracked ridge mortar and failed flashings. Once a roof is cleared, these become visible. They are quoted separately, with photographs, so you decide what to do. A cleaner who gives a low price and then adds repairs on the day is a risk worth avoiding.
Treatment type and number of visits
A single treatment is cheaper than a clean plus a follow-up. Some products need a second coat in heavy growth. A good quote says what is included.
What is usually in a roof clean quote, and what is not
Quotes that look similar can describe different jobs. Check the following.
- The method: hand removal, soft wash, pressure jet, or a mix, and what the biocide is.
- The access: ladders, tower or scaffold, and who pays.
- The gutters: cleared, flushed, or left.
- The ridge, hips and verges: checked, or ignored.
- The waste: moss and debris taken away, or left in the garden.
- The aftercare: what you should expect over the next weeks.
- The guarantee, if any, and what it covers.
A price with none of this detail is not a quote, it is a number. Compare the descriptions before you compare the totals.
Is a cheap quote a bargain?
Sometimes. Some small firms are efficient and charge fairly. Often, though, a low price means a faster method, less care, no gutter clearance or no disposal. A very low figure for a large roof is hard to explain without one of these. Ask how the job will be done. If the answer is a pressure washer and a quick rinse, you are buying the cheapest method at a higher risk to the roof, and the regrowth may be fast. Our page on moss removal methods compared weighs scraping, washing and biocide.
A high figure is not proof of quality either. Ask what the extra pays for: a safer method, a scaffold, a follow-up visit, or a written guarantee.
Commercial and larger roofs
Everything above applies to houses. Commercial roofs, flat roofs and large outbuildings are priced differently, usually by area, and the covering may not be tile at all. Cleaning a flat roof is a different task, covered in our answer on how to clean a flat roof. Roofs with asbestos cement sheets are not cleaned by force. The extra work of fall protection, permits and timings on a commercial site can outweigh the cleaning itself. Tell us the type of building when you ask, and we will say whether it is a job for the survey or something to refer elsewhere.
Is it worth the money?
That depends on the roof and on what you want. For a roof with heavy moss that is filling gutters and lifting tiles, cleaning is sensible maintenance and cheaper than the damage that follows. For a roof with light lichen on sound tiles, it is cosmetic, and you may choose to wait. Our short answer on whether roof cleaning is a waste of money gives the arguments on both sides, and roof cleaning before selling a house deals with the sale case.
Think of a clean as a maintenance cost spread over time. A roof treated at sensible intervals needs lighter work each time. A roof left until the moss is thick needs the heavy clean. Our guide to how often a roof should be cleaned helps with the rhythm.
Extras that sometimes come with a clean
A roof clean often prompts a handful of add-ons, and it helps to know which are worth considering. Gutter and fascia cleaning is the most natural, since the gutters take the debris. Zinc or copper strips fixed below the ridge can slow regrowth on the slope beneath, though their reach is limited, as our answer on zinc strips and roof moss explains. A second treatment visit on a heavily infested roof is sometimes advised. A tile coating is a bigger step and a bigger cost, and is covered in roof coatings on tiled roofs. Repairs to ridge mortar or tiles that the clean uncovers come last. None of these is automatic. Each should appear as its own line on the quote, so that you can say yes or no to it.
Seasons, timing and booking
Demand for roof cleaning rises in spring, when people notice winter's moss and the weather improves, and again in early autumn. A booking in a quiet spell can be easier to arrange. Weather also decides the day: a clean needs dry, calm conditions, so a date can move. Treatment works best in mild spells and not in hard frost, a point covered in our answer on the best time to remove roof moss. If you are cleaning ahead of a sale or an event, book early and allow for a delay.
Paying fairly and keeping the paperwork
A fair arrangement is simple. You get a written quote that describes the work, you agree it, the work is done, and you pay when you are satisfied. Be cautious about large payments in advance or a demand for cash only. Keep the quote, the invoice and any photographs. If the cleaner makes a claim about the length of the effect, ask for it in writing. The regrowth timetable in our moss regrowth answer gives a realistic expectation, so a reasonable claim is easy to recognise. Be as wary of a promise that the moss will never return as you would of a promise of a bargain.
Saving money without cutting corners
A few choices bring the cost down without hurting the result. Share the scaffold with other jobs: if the fascias, gutters or chimney need work, one scaffold can serve all of them. Clear overhanging branches before the visit, which cuts both the work and the regrowth. Keep the roof treated at intervals, so the clean stays light. Choose the right time of year, as quieter periods can be easier to book. And tell the cleaner what you know about the roof, including any previous repairs.
What not to do is to pick the method on price alone, or to try the job from a ladder with a rented pressure washer. DIY looks cheap, and our page on DIY or professional roof cleaning sets out the costs people overlook.
How our quote works
We do not quote from a photograph or a phone call. The free survey looks at your roof, identifies the covering, measures the growth and photographs what we find, including the ridge, verges and gutters. The report then sets out one fixed written price for the method we recommend, with scaffold and any repairs shown as separate lines. If the roof needs nothing, or only a light touch, we say so.
The waste leaves with us, and the work is backed by a ten-year guarantee on our workmanship, put on paper. Read more about the service on our roof cleaning in Basingstoke page, and when you want a price, ask for the survey on 01256 213956 or by WhatsApp.
