How to Choose a Roof Cleaner and Avoid the Cowboys

If someone's knocked on your door offering to clean your roof for cash today, your guard should already be up. Roof cleaning is one of those jobs where it's hard to tell good work from bad until months later, and that gap is exactly where the cowboys operate. You hand over money, they blast the roof, and the damage doesn't show until the next hard Durham winter.

The good news is that a proper firm gives itself away just as clearly as a dodgy one, if you know what to listen for. You don't need to be an expert on tiles or biocides to ask the right questions. This guide walks through the signs that tell you who's worth trusting on your roof and who to send packing before they get near a ladder.

The quick answer: Choose a roof cleaner who soft washes rather than pressure blasts, carries proper insurance, works from safe access, gives you a written quote, and has real local reviews, and avoid anyone doing cold-call doorstep sales who wants cash up front.

1. Why dodgy roof cleaners keep turning up

Roof cleaning has a low barrier to entry. Anyone can buy a pressure washer, load a van, and start knocking on doors, and plenty do. Because the results look impressive the same day, a bad job can pass for a good one right up until the tiles start letting water in, and by then the van is long gone.

Durham gives these operators plenty of targets. Damp air off the Wear valley keeps roofs mossy across the whole area, so there's no shortage of green roofs to point at. When someone tells you your roof looks terrible and they can sort it this afternoon, that urgency is the sales pitch, not a genuine assessment of your home.

2. Check they soft wash, not just blast away

The single most important question is how they'll actually clean the roof. A good firm soft washes, using low-pressure water and a biocide treatment that kills moss and algae at the root without hammering the tiles. A cowboy reaches straight for a pressure washer because it's fast and it looks dramatic.

High pressure strips the protective surface off concrete tiles and can crack or dislodge older slate, which matters a lot on Durham's period stone terraces and slate roofs. If someone can't explain why soft washing protects your roof, or waves the question away, that tells you they either don't know or don't care. Both are reasons to say no.

3. Ask about insurance and how they reach the roof

Working at height is where roof cleaning gets genuinely risky, for the worker and for you. A proper firm carries public liability insurance and can tell you plainly how they'll access your roof, whether that's ladders, a tower, or a platform. A cowboy dodges the insurance question and improvises access on the day.

This matters more on the taller three-storey terraces you see around the city and in older parts of Durham, where a fall or a dropped tile onto the street below is a serious business. If an accident happens on your property and the person isn't insured, you do not want to be finding that out afterwards. Ask early, and ask directly.

4. Watch for pressure selling and cash-only jobs

The doorstep cold call is the classic cowboy move. They happen to be working in the area, they've spotted your roof, and there's a special price if you say yes right now. Real firms don't operate like that. They quote, they let you think, and they don't panic if you want to check them out first.

Cash up front with no paperwork is another warning sign. On estates around Belmont and Framwellgate Moor these knock-and-go outfits tend to work a street at a time, moving on before anyone notices the job wasn't what was promised. If you feel rushed or pushed, that feeling is worth trusting. Take their details and look them up before you commit to anything.

5. Get the job in writing before it starts

A written quote protects everyone. It should spell out what's being cleaned, the method, whether gutters are included, and what the price covers. When it's all verbal, it's your word against theirs if the moss is back in a month or a gutter got missed entirely.

A clear quote also stops the price creeping up halfway through. Some outfits start low to win the job, then find reasons to add on once they're up the ladder. If a firm is happy to put the details in writing and answer questions about them, that's a firm that expects to stand behind its work rather than disappear after the invoice.

6. Local knowledge and a real reputation

A cleaner who knows Durham roofs knows what they're dealing with. The mix of Welsh and Scottish slate on the older terraces, the concrete tiles on the newer estates around Gilesgate and Neville's Cross, and the damp that never quite lifts off the valley floor all change how a roof should be treated. Local experience shows in the questions they ask about your home.

Reputation is the other half of it. Look for reviews from real addresses nearby, ask neighbours who they've used, and be wary of anyone with no traceable history at all. A firm that's worked in the area for years and wants to keep working here has every reason to do the job properly. A passing van does not.

• Method matters: Insist on soft washing over pressure blasting to protect slate and concrete tiles alike.
• Insurance: Public liability cover is non-negotiable for anyone working at height on your home.
• No doorstep rush: Cold calls with a today-only price are the oldest trick in the trade.
• Written quote: Get the method, scope, and price on paper before any work begins.
• Local track record: Real Durham reviews and a settled reputation beat a nameless van every time.

Frequently Asked Questions

Should I ever accept a doorstep roof cleaning offer?
It's best not to. Genuine firms rarely cold-call with a price that only stands if you agree on the spot, so treat that pressure as a reason to close the door and find someone yourself.

How do I know if a roof cleaner is insured?
Just ask to see their public liability cover. A proper firm will happily confirm it, while anyone who gets evasive or changes the subject is telling you something you need to hear.

Is pressure washing ever the right choice for a roof?
Rarely, and not on delicate tiles or slate. Soft washing clears moss and algae without stripping or cracking the surface, which is why it suits the older roofs common across Durham.

Why do cowboys prefer cash and no paperwork?
Because it leaves no trail. Without a written quote or receipt there's nothing to hold them to if the work fails, which is exactly why a reputable cleaner offers both without being asked.

What questions should I ask before hiring?
Ask how they'll clean it, whether they're insured, how they'll reach the roof, and whether they'll put it in writing. Clear, confident answers to all four are a good sign.

Want a roof cleaner you can actually trust?
Ben's Roof Cleaning offers honest, insured roof and gutter cleaning with proper soft washing across Durham and County Durham, with over 15 years of experience. Get in touch or call 07889 127153 for a free, no-obligation quote.

A few questions save you a lot of grief

Choosing a roof cleaner really comes down to slowing down and asking a handful of straight questions. How will you clean it, are you insured, how will you get up there, and will you put it in writing. The cowboys fall apart under that gentle scrutiny, while a proper local firm answers without blinking. Take the extra day to check, and you'll spare yourself the far bigger cost of putting a botched job right later.