Hiring the wrong pressure washing company can leave you with damaged render, stripped pointing, or water forced behind cladding that causes damp for months afterwards. The difference between a careful, competent operator and a cowboy with a hired machine is not always obvious from a website or a flyer through the door. Knowing what to look for before you hire someone will save you money and a lot of hassle.
What to Check Before You Hire
Before you even ask for a quote, run through a few basic checks on any company you are considering.
- Public liability insurance: Any professional pressure washing company should carry public liability insurance, typically for at least £1 million. Ask for proof. If they hesitate or cannot provide a certificate, walk away.
- Trading history: Look for a company that has been operating for at least two or three years. New companies are not automatically bad, but an established track record gives you something to assess.
- Local presence: A business based in Edinburgh or your part of Scotland is easier to hold accountable if something goes wrong. Avoid sole traders who cannot give you a verifiable address.
- Written quote: Reputable companies provide a written quote that itemises the work. A verbal price over the phone with no follow-up in writing is a red flag.
Qualifications and Certifications Worth Looking For
Pressure washing is not a licensed trade in the UK, which means anyone can set up and start taking money. That makes professional affiliations more important, not less.
- The Federation of Window Cleaners (FWC): Covers external cleaning services including pressure washing. Members agree to a code of conduct and carry appropriate insurance.
- Safe Contractor or Constructionline approval: Useful if the work is on a commercial property or as part of a larger renovation project.
- CHAS (Contractors Health and Safety Assessment Scheme): Relevant for larger jobs or contracts with public bodies. Common in Scotland across trades.
- CSCS card: Not mandatory for pressure washing but a sign the operator takes professional development seriously.
- Soft washing certification: For render, painted surfaces, or older stonework, soft washing (low pressure with specialist detergents) is often safer than high-pressure blasting. Ask specifically whether the company offers this and whether their operators are trained in it.
Reality check: Scottish sandstone and traditional harl render are particularly vulnerable to damage from high-pressure jets. If your property has either, make sure you confirm in writing that the company will use appropriate pressure settings and techniques before work begins.
How to Compare Quotes Properly
Price alone tells you very little. When you receive quotes, compare like for like by asking the same questions of each company.
- What pressure (PSI or bar) will be used on each surface?
- Are any cleaning chemicals or detergents included, and are they biodegradable?
- Will the operative work alone or bring a team?
- How long will the job take?
- Is waste water disposal included, or will there be an extra charge?
- What is the process if a surface is damaged during the work?
A quote that is significantly cheaper than the others usually means something has been left out. That might be insurance, proper equipment, or adequate time to do the job carefully.
Red Flags to Watch Out For
- No written quote or contract
- Cannot provide proof of public liability insurance
- Asks for a large cash deposit upfront with no receipt
- No fixed business address or only a mobile number
- Unwilling to discuss the pressure settings or techniques they will use
- No reviews or testimonials anywhere online
- Quotes a single price over the phone without seeing the property
- Pushes you to book immediately or claims the low price is only available today
What a Good Job Looks Like
A professional pressure washing service will do more than just turn up and point a jet at your driveway or patio. Before work starts, they should assess the surfaces and discuss the approach with you. During the job, they should protect nearby plants, drainage points, and any surfaces not being cleaned. When finished, they should leave the area clean and tidy, with no pooled water or chemical residue left behind.
A good company will also be honest about what pressure washing cannot fix. Deeply stained concrete, certain types of mould, or surfaces that are already damaged may need additional treatment or repair before or after cleaning. If a company promises results that sound too good to be true, treat that sceptically.
How to Read Online Reviews
Reviews on Google or Checkatrade can be useful, but read them critically. Look for reviews that describe the actual work done rather than just giving five stars with no detail. Pay attention to how the company responds to any negative reviews: a professional response that addresses the complaint is a better sign than no response or an aggressive reply. Aim for companies with at least 15 to 20 reviews so you are not relying on a handful of results.
For more detail on what to ask before you commit, see our guide to questions to ask when choosing a pressure washing service.
Ready to find a pressure washing service? Browse and hire a trusted pressure washing service in Edinburgh through Found Local, where all listed businesses are based in Scotland and open to independent review.