What to check before you hire a window cleaner in north London: insurance, method, reviews, reliability and the questions worth asking.
Choosing a window cleaner looks easy. Most people pick one from a flyer, a recommendation or a quick search, and it usually works out.
When it doesn't, the pattern is familiar: they don't turn up, they leave streaks and smears, they scratch a frame, or they vanish after a couple of visits. None of that is hard to avoid if you know what to check before you book.
This guide covers who to trust, what to ask and what should make you hesitate. For how quotes are worked out, see our separate piece on how window cleaning is priced.
What should you look for in a window cleaner?
Five things matter more than anything else: that they are insured, that they use a sensible method, that their reputation holds up locally, that they are clear about what you are getting, and that they are reliable.
Everything below is a closer look at those five. If a cleaner is good on all of them, you are unlikely to be disappointed.
1. Insurance
Ask whether they hold public liability insurance, and ask to see proof. It is a normal question, and a good cleaner will answer it without fuss.
It matters because the job involves working near your windows, frames and sometimes upper floors. If something is damaged, cracked glass, a broken frame or water where it shouldn't be, insurance is what covers it. A cleaner without it leaves you to argue about who pays.
We are fully insured, and we are happy to say so up front.
2. Method
How the windows are cleaned affects the result and the risk.
Many professional cleaners now use a water-fed pole system with purified water. It cleans from the ground, so there are no ladders against your windows or frames, and purified water dries without leaving marks. It also reaches upper floors without anyone climbing.
Traditional bucket-and-ladder cleaning still works, particularly for detail and for hard-to-reach glass, but it puts a ladder against your property and relies more on the individual's skill.
Neither is automatically wrong. What matters is that you know which you are getting and that the cleaner can explain it. We use a water-fed pole system and work from the ground.
3. Reviews and local reputation
Reviews are useful, but read them for patterns rather than star ratings.
Look at the Google Business Profile first. A good sign is a steady stream of reviews over time, written in different voices, that mention specific things: turning up when promised, tidy work, clear communication. A burst of near-identical reviews posted within a few days is worth a second look.
Pay attention to how the business responds to a poor review. A calm, specific reply tells you more than a perfect score.
The best check is still local. Ask a neighbour who has their windows done, or look at your own street: a van that comes round every few weeks and a row of clean windows is the most honest reference there is.
4. A clear scope
You should know what you are paying for before anyone starts. Which windows? Glass only, or frames and sills too? Every floor? Conservatory glazing or skylights? A cleaner who is vague about this is leaving room for a disagreement later.
A good cleaner will tell you plainly what the job covers. We give a free, no-obligation quote and explain what it includes before any work begins.
5. Reliability
A window cleaner can do perfect work and still be a poor choice if they are unreliable. Look for someone who:
- replies to messages and calls promptly,
- gives you a clear day or a clear window for the visit,
- tells you in advance if the weather or an emergency means a change,
- has been working in the area for a while.
Experience in the area is a good proxy. A business that has been cleaning windows across north London since 2009, as we have, has had to be reliable to stay in business.
Does experience with your type of property matter?
Yes, more than people expect. A modern flat with flush UPVC windows and a four-storey period house with sashes and bays are different jobs.
Period windows need care. Sash cords, old putty, painted timber and leaded lights are not forgiving, and a cleaner who treats them like modern double glazing can cause damage. Ask whether they regularly work on properties like yours. North London has a great deal of period housing, and a cleaner who knows it will handle it differently.
Questions to ask before you book
Keep this short list to hand. A good cleaner will answer all of them easily.
- Are you fully insured, and can you show me proof?
- How do you clean: water-fed pole, or ladders and buckets?
- What exactly does the price include?
- How often would you come, and what happens if you cannot make a visit?
- Do you regularly work on properties like mine?
- Is the quote for the whole job, or an estimate that may change?
Warning signs worth taking seriously
These do not always mean a cleaner is bad, but they are reasons to ask more questions.
- They avoid the insurance question or cannot show anything when asked.
- They ask for a large payment up front for a routine clean. Window cleaning is normally paid for after the work or on a regular basis, not as a big deposit.
- There is no way to check them. No business name, no local presence, no reviews, no way of being contacted except one mobile number that does not answer.
- They push a long contract with no clear way to cancel. Regular cleaning is a service you should be free to adjust.
- They are vague about what is included or reluctant to put anything in writing.
- They turn up unannounced and press you for an immediate decision. Good cleaners are happy to let you think about it.
Local or national?
Both can do good work, and neither is automatically better. The case for a local cleaner is practical: they know the area, they know the property types, they tend to run a regular round so they are nearby week after week, and you are dealing with the person who actually does the work.
If you have a large commercial property or need cover across several sites, a larger company may suit you better. For a home in north London, a good local cleaner is usually the simplest and most accountable choice.
Frequently asked questions
How do I find a reliable window cleaner near me?
Start with a local recommendation, then check their Google reviews for a steady pattern over time. Ask whether they are insured, how they clean and what the price includes. A reliable cleaner answers all three without hesitation.
How do I know if a window cleaner is insured?
Ask whether they hold public liability insurance and ask to see proof. A professional will have it to hand and be happy to share it. If they avoid the question, treat that as a warning sign.
Do window cleaners need a licence in the UK?
There is no general licence required to clean windows. That is why insurance, a visible local track record and clear communication matter so much when you choose.
Should I pay a window cleaner upfront?
For a routine clean, usually not. Payment normally follows the work or runs on a regular schedule. A request for a large deposit before any work is done is a reason to ask more questions.
Are online reviews reliable?
They are useful if you read them for patterns: a steady stream over time, different writers and specific details. Be cautious about a sudden burst of similar reviews, and take as much notice of how the business replies to criticism as of the star rating.
Is it better to use a local window cleaner or a large company?
A local cleaner tends to know the area and property types, runs a regular round and is accountable directly. A large company may suit multi-site or commercial work. For a home in north London, local is usually simpler.
Do you offer free quotes?
Yes. We give a free, no-obligation quote for homes and businesses across north London.
Window cleaning across north London
We clean windows across north London, from the terraces of Islington to the larger houses around Hampstead, and out through Barnet, Enfield and the surrounding postcodes. We have been doing it since 2009, we are fully insured and we clean from the ground with a water-fed pole system.
If you are choosing a window cleaner, ask us the questions above. We are happy to answer every one.