Have you ever looked up at your roof and noticed dark streaks, moss patches, or layers of dirt? It might seem like a job you could tackle over a weekend with a pressure washer. But is it really that simple?
Roof cleaning isn’t just about appearance. It’s about protecting one of the most important parts of your home. While DIY might seem like a cost-saving option, the risks often outweigh the benefits. Here’s why hiring a professional is a smarter, safer choice.
Is Your Roof Dirtier Than You Think?
Roofs naturally collect:
- Algae (especially Gloeocapsa magma, common on asphalt shingles)
- Moss and lichen
- Dirt and grime from pollution
- Leaves and other debris
These aren’t just cosmetic issues. Algae feeds on the limestone filler in shingles, weakening them over time. Moss retains moisture, which can cause wood rot or lift shingles. Dirt and leaves block water flow, increasing the risk of leaks.
Still thinking about doing it yourself?
The Risks of DIY Roof Cleaning
Cleaning your roof without the proper tools or experience is more dangerous than many realise. Here’s what you’re up against:
- Height and Safety Hazards
- Falls from roofs are one of the leading causes of home-related injuries.
- The Health and Safety Executive (HSE) reports hundreds of serious falls each year involving ladders and rooftops.
- Even with a harness, walking on a damp or mossy roof can be extremely slippery.
Would you feel confident walking on a sloped, slick surface several metres up?
- Improper Cleaning Methods Can Cause Damage
- High-pressure washing can strip the protective granules off shingles.
- Using bleach or harsh chemicals without dilution may corrode tiles or harm surrounding vegetation.
- Brushing too hard can dislodge tiles or crack them, especially if they’re older.
Professionals use soft-wash systems and eco-friendly solutions designed specifically for roof surfaces.
Expertise Matters More Than You Think
Professional roof cleaners bring more than just tools—they bring years of training and knowledge.
What Do They Know That You Don’t?
- How to identify the type of roofing material and the best cleaning method for it
- Which algae or moss are harmless and which ones are damaging
- How to spot early signs of roof deterioration while cleaning
Case Example:
A homeowner in Kent attempted to clean moss off his roof using a pressure washer. Within six months, water was leaking into the attic due to loosened tiles. A £100 DIY job turned into a £1,500 repair.
Professionals would have known how to remove the moss without lifting or cracking tiles.
It’s Not Just About Cleaning
Hiring a professional often comes with added services:
- Inspection: Many pros will assess your roof for signs of damage or wear while they clean.
- Gutter clearing: Debris often builds up here too, affecting drainage.
- Preventative treatments: Anti-fungal or moss-inhibiting sprays can extend the life of your clean.
These extras aren’t upsells—they’re preventative steps that save money in the long run.
Insurance and Liability Protection
When you clean your roof yourself, you assume all the risk. If you damage the roof or injure yourself, your home insurance might not cover the costs.
Professionals, on the other hand:
- Are fully insured for personal injury and property damage
- Offer guarantees or warranties on their work
- Use approved cleaning agents and safety equipment
Would you rather spend a few hundred pounds for peace of mind, or risk a costly mistake?
Time and Cost: Is DIY Really Worth It?
Let’s break it down.
DIY Roof Cleaning:
- Equipment hire (ladder, pressure washer): £80–£150
- Cleaning chemicals: £30–£50
- Safety gear: £50–£100
- Time spent: 1–2 days
- Risk: High
Professional Roof Cleaning:
- Average roof cleaning cost: £300–£600 depending on size and condition
- Time spent: 4–6 hours
- Risk: None to you
- Outcome: Professional finish, no mess left behind
When you add up the true cost of DIY—including your time, potential risks, and long-term damage—it’s rarely the cheaper option.
Protecting Your Investment
A well-maintained roof:
- Extends the life of your shingles or tiles
- Boosts kerb appeal (especially if you plan to sell)
- Prevents moisture-related issues like mould, leaks, and rot
- Retains property value
Think of it this way: Would you neglect your car for years and then try to fix it yourself with a power hose and household bleach?
Your roof deserves the same level of care and expertise.
Spotting a Trustworthy Roof Cleaner
Not all services are created equal. Here’s how to find a reputable roof cleaner:
- Check reviews on Trustpilot, Google, or local forums
- Ask for proof of insurance
- Request a detailed quote (not just a verbal estimate)
- Look for accreditations from trade bodies like the National Federation of Roofing Contractors (NFRC)
Avoid anyone who insists pressure washing is the only way. It’s a red flag.
Questions to Ask Before Hiring
- What cleaning method do you use for my roof type?
- Do you apply any treatments after cleaning?
- How long have you been in business?
- Can I see before-and-after photos of past work?
- Do you offer a satisfaction guarantee?
Good companies won’t hesitate to answer these.
Still Thinking of Doing It Yourself?
Ask yourself:
- Can I safely reach every part of the roof without risk?
- Do I know which parts are fragile and which are walkable?
- Am I prepared to damage the roof—and pay for it—if I get it wrong?
- Will a DIY clean last as long as a professional one?
If the answer is “no” or even “I’m not sure,” it might be time to call a pro.
Final Thoughts
Roof cleaning isn’t just a quick wash and rinse. It’s a specialised task that requires the right tools, techniques, and know-how. While it may seem like an easy weekend project, the risks—from personal injury to costly roof damage—make DIY a gamble.
Hiring a professional gives you:
- Long-lasting results
- Safety and peace of mind
- Protection for your biggest asset—your home
Your roof protects you every day. Isn’t it time you gave it the care it deserves?
