Do Window Cleaners Clean Inside?
Here's something that catches many people off guard: you book a window cleaner, they come round, do their thing, and leave. You're pleased with the sparkling exterior, but when you look from inside your house, you can still see all those fingerprints, smudges, and marks on the interior surface. What happened?
The truth is, most window cleaners in the UK don't clean inside as part of their standard service. And there are some genuinely interesting reasons why the industry works this way.
The Technology Changed Everything
To understand why interior cleaning became a separate service, you need to know about water-fed poles. These are the long telescopic poles you see modern window cleaners using, with brushes on the end that spray purified water. They've revolutionized exterior window cleaning—a cleaner can reach four storeys high from the ground, work quickly and safely, and the purified water dries without leaving streaks.
But here's the catch: you can't use them indoors. Imagine someone standing in your living room with a 20-foot pole spraying water everywhere. It's simply not practical.
So whilst exterior window cleaning evolved into this efficient, high-tech operation, interior cleaning is still done the old-fashioned way—bucket, squeegee, cloth, and elbow grease. It's a completely different job, which is why it's treated as a separate service.
What "Standard" Window Cleaning Actually Means
When a window cleaner advertises their services or gives you a quote, unless they specifically mention interior cleaning, they're only talking about the outside. This isn't them trying to pull a fast one—it's just how the industry works.
Most residential window cleaners operate what's called a "round"—a route of regular customers they visit on a schedule, perhaps every four weeks or every eight weeks. They turn up, clean the outside of your windows, post a note through the door saying they've been, and off they go to the next house. You might not even see them.
This system only works for exterior cleaning. Interior cleaning requires:
- You being home to let them in
- Specific appointment times
- Moving through your house with equipment
- Working around your furniture and belongings
- Much more time per property
A window cleaner might do 15-20 houses in a day doing exteriors only. Add interior cleaning and that number drops dramatically. It's not just about the time. it's about the entire way the business operates.
The Trust Factor Nobody Talks About
Here's something window cleaners themselves will tell you: not everyone wants strangers in their house. It sounds obvious when you say it, but it's a real factor in why interior cleaning is less common.
Professional window cleaners often mention that they're not insured to touch or move your belongings. That means before they arrive, you need to clear every window sill of photos, plants, ornaments, and anything else that might be in the way. For some people, this is no problem. For others, it's a hassle they'd rather avoid.
There's also the simple fact that many people aren't comfortable having tradespeople wandering through their home when they're out at work. Exterior cleaning solves this, the cleaner never needs to enter your property.
When You Actually Notice the Difference
Interestingly, dirty interior windows often don't bother people until the exterior gets cleaned. When both sides are dirty, your brain just registers "grimy windows." But clean the outside and suddenly every smudge, fingerprint, and mark on the inside becomes glaringly obvious.
This is particularly true in kitchens, where cooking grease creates a film on interior windows that you might not notice until the outside is spotless. Parents with young children also tend to be more aware of interior window cleanliness—little handprints at child height are rather unavoidable.
Interior windows in bathrooms face their own challenges with soap scum, mineral deposits from hard water, and condensation marks. These need different cleaning approaches than standard window cleaning provides.
The Actual Process Is Quite Different
When window cleaners do offer interior cleaning, they're essentially doing a different job. They use traditional methods: soapy water, a squeegee, and microfibre cloths. Some use specialist cleaning solutions; others swear by just water and a drop of washing-up liquid.
The technique matters more indoors because you're working in closer quarters and any mistakes—drips on the carpet, water marks on the sill—are immediately visible. Professional window cleaners use what's called the "S technique" with the squeegee to avoid leaving water lines, but it takes practice to do well.
They also need to protect your home. Professional companies use specialised equipment that collects dirty water, put down towels to protect carpets, and wear shoe covers or remove their shoes. All of this adds time and complexity compared to standing outside with a water-fed pole.
Why Some Window Cleaners Don't Offer It At All
Not every window cleaner does interior work. Some deliberately choose not to offer the service, and their reasons are worth understanding.
The business model is one factor—if you've built your business around efficient exterior-only rounds, adding interior work disrupts the whole system. You can't just fit it in between other jobs; it requires dedicated time slots.
Equipment is another consideration. A window cleaner set up for water-fed pole work might not have invested in the traditional cleaning kit, ladders, and other equipment needed for interior work. Starting to offer interior cleaning means buying new kit and learning different techniques.
Insurance and liability also play a role. Working inside someone's home carries different risks than working outside. There's potential for damage to carpets, furniture, or belongings. Some window cleaners simply prefer to avoid these complications.
The Cost Question (Because It Matters)
You're probably wondering what interior cleaning costs. The typical approach is to charge it as an add-on. one window cleaning company charges three times the exterior price plus £10. So if your exterior clean is £25, adding interior would cost an extra £85.
That might sound steep, but consider what's involved: the cleaner needs to book a specific appointment, travel to your property at that time (not just when they're in your area anyway), spend significantly longer on the job, work more carefully, and use different equipment and methods.
Some cleaners price interior work by the hour or by the window. Expect interior cleaning to cost somewhere between £15-£70 for a standard house, though this varies enormously based on property size and location.
What Commercial Properties Do Differently
Offices, shops, and restaurants tend to approach this completely differently. For commercial properties, interior window cleaning is often considered essential, not optional.
A shop window full of fingerprints sends the wrong message to customers. Office windows with interior grime affect employee morale and the professional image presented to clients. Restaurants need spotless windows inside and out for hygiene and ambiance.
Commercial window cleaning contracts typically include both interior and exterior cleaning as standard, with cleaning scheduled during off-hours when it won't disrupt business. The pricing and service model is completely different from residential work.
The DIY Reality
Many people decide to clean their interior windows themselves, which is entirely reasonable. Interior window cleaning is safer than exterior cleaning—you're not on a ladder outside, you're working from solid ground in your own home.
The equipment needed is basic: a bucket, squeegee, cleaning solution (or just water and washing-up liquid), and microfibre cloths. You can get everything you need for £20-£40.
However, achieving professional results takes more effort than you might expect. Common mistakes include cleaning in direct sunlight (causes streaking), using newspaper (the ink can smear), applying too much pressure, and not properly drying the glass after squeegeeing.
The time investment is also significant. For an average house, properly cleaning all interior windows might take 2-3 hours if you're doing it thoroughly. Professional cleaners work faster because they've refined their technique through repetition.
What Actually Makes Sense for Most People
The most common approach is a hybrid: have professionals clean the exterior regularly (maybe every 4-8 weeks) because they can do it efficiently and safely with their water-fed poles, then either clean the interior yourself between professional visits or book professional interior cleaning once or twice a year.
This balances cost with results. The exterior is where most dirt accumulates and what affects your home's appearance from the street. The interior can often be maintained adequately with occasional DIY cleaning and periodic professional attention.
Some people only ever have the exterior professionally cleaned and never bother with interior cleaning services. Others want both done professionally every time. There's no right answer. it depends on your standards, budget, and how much time you want to spend on home maintenance.
The Questions You Should Actually Ask
When you're booking a window cleaner and want to understand what you're getting, here are the questions that actually matter:
"Does your standard price include interior and exterior, or just exterior?" This is the big one. Don't assume—ask explicitly.
"If I want interior cleaning added, what's the extra cost?" Get the actual figure so you can decide if it's worthwhile.
"Do I need to be home for the work?" For exterior-only cleaning, probably not. For interior, definitely yes.
"What do you need me to do to prepare?" They'll likely want you to clear window sills at minimum.
"Can you clean upper floor windows from the inside?" Not all window cleaners have the equipment or willingness to work on interior upper-floor windows.
The Bigger Picture
Understanding that interior cleaning is typically a separate service helps you avoid the frustration of expecting one thing and getting another. It also helps you appreciate why the pricing is structured the way it is.
The window cleaning industry has evolved toward specialisation. Exterior cleaning has become incredibly efficient with modern equipment. Interior cleaning remains a traditional, hands-on, time-intensive job. These are genuinely different services, and treating them as such makes sense for both cleaners and customers.
When you book a window cleaner, be explicit about what you want. If you only say "window cleaning," you'll get exterior only. If you want both, say so upfront and get pricing for the complete service.
And if you're disappointed that your "window cleaning" didn't include the interiors, well, now you know why, and what to ask for next time.








