Is a roof clean worth it before selling?

There are two audiences for your roof. The first is the buyer on the pavement, who forms an opinion in seconds. Moss, dark streaks and green film say "neglected", whether or not the roof beneath is perfectly good. A clean slope reads as cared for, and it shows in the listing photographs.

The second audience is the surveyor the buyer sends. They check the roof from the garden and again from inside the loft, and they note anything that suggests defects: slipped or cracked tiles, sagging lines, failing pointing, poorly flashed chimneys. A clean surface does not hide those things. If anything, it makes them easier to see.

That is the trade-off. A clean improves the first impression and tells the surveyor you looked after the roof. But if there are faults underneath, they become visible, and a buyer may use them to negotiate. Better to know first, while there is still time to repair, to explain or to adjust the asking price. It also stops a surprise at the exchange stage from reopening a deal that seemed settled.

Thick moss can mask cracked tiles, open joints and lifting edges. Once it is scraped away, you may find repairs that were invisible from below. Our answer on moss lifting roof tiles explains one way growth leads to damage.

If that happens, you have three options: repair, disclose or adjust the price. Repairs done properly, with the receipts and photographs, give a buyer less to quibble over. Disclosure through your solicitor is a matter for your own advisers. We can only say what we found and what it would cost to put right.

The point is that the clean is the quickest, least costly way to learn the roof's real condition. It is far better to find out before a buyer's surveyor does, with time to choose what to do.

MyBuilder's 2026 roof cleaning guide starts at about £300 overall, with pitched roofs at £450 to £850, tile roofs at £400 to £750 and slate at £500 to £1,000. Soft washing is quoted at £15 to £20 per m² and manual scraping at £5 to £10 per m². Treat these as national typical ranges rather than Supreme figures, and remember that access can add to them.

If you would rather have the roof inspected than cleaned, MyBuilder's 2026 inspection guide puts a standard survey at £150 to £250 and a drone survey at £200 to £400. For many sellers an inspection with photographs is the more useful first step, because it tells you whether a clean is enough.

For the full cost picture, including what changes the price, see the cost guide to roof cleaning in Stroud.

Cleaning makes the most sense when the roof is basically sound and the growth is the main thing letting it down. A roof with algae streaks or light moss on tiles in decent condition will usually look dramatically better after a clean, and the cost is small against a sale price.

It makes less sense when the covering has nearly run out of years. A tired concrete tile that is flaking, or a slope with many slipped slates, needs repair or replacement, not a rinse. Paying to clean a roof that is about to be criticised in a survey is money that might be better spent on the repair.

Pitch and position matter too. A north-facing slope that is hidden from the road may not be worth cleaning at all. Look at what a buyer will see when they arrive, and start there. Our answer on moss on the north side of a roof explains why one slope often looks worse than the other.

Keep what you can. Before and after pictures, together with a written note of what was done, are useful to hand to the estate agent or the buyer's solicitor. They show that the work was done properly rather than glossed over.

Book the work well ahead of marketing, ideally before the photographs are taken. A fresh clean taken in sunshine is a good selling image, but the growth you see in summer is only the start of what returns, so there is no point cleaning months before you list.

Do not use harsh methods to rush it. High-pressure jets can damage tiles and slates, and a damaged roof is worse for a sale than a mossy one. The staining you can see on the slopes is treated in our answer on green algae on a roof.

If you are thinking of selling, send us photographs of the front and rear slopes, and tell us how the roof looks from the loft. We will say whether a clean is likely to be enough or whether repairs look likely. Details of the wider service are in roof cleaning and moss removal in Stroud.

Our survey photographs your own roof, and the written quote covers the whole job. Any repair we carry out comes with a 10-year workmanship guarantee in writing, which you can pass on to a buyer as part of your paperwork. Call 01453 933613 or use the enquiry form.