Commercial Window Cleaning: A Practical Guide for UK Business Owners

By Philip Scott, C-Thru Cleaning, Leeds  |  c-thrucleaning.co.uk  |  07757 173014

Commercial window cleaning is the professional cleaning of glass on business premises, using methods chosen to suit the building’s height and design.

I am Philip Scott. I run C-Thru Cleaning in Leeds. My team cleans glass on shops, offices, schools and industrial units across West Yorkshire.

This guide explains how the work is done, how often your glass needs attention, and what the law expects from you as a building owner. Most guides skip the parts that matter. This one does not.

Key Takeaways

• Commercial window cleaning covers exterior and interior glass on business premises, including frames, sills and doors.
• Water fed poles reach around 20 metres, or 60 feet, from ground level. That covers most buildings up to five or six storeys.
• Shopfronts usually need weekly or fortnightly cleaning. City centre offices often suit monthly at ground level and quarterly above.
• The Work at Height Regulations 2005 place legal duties on building owners and facility managers, not just on the cleaner.
• Cradles and building maintenance units need a thorough examination at least every six months under LOLER 1998.

What does commercial window cleaning include?

A proper commercial clean covers the glass, the frames, the sills and the doors.

Many firms quote for glass alone. Then the first shower washes dirt off the frames and back down your clean panes. The customer sees streaks within a day and blames the cleaner.

At C-Thru we clean sills, frames and doors as standard on every visit. It is not an upsell. It is the only way a clean lasts.

A full service usually includes:

• Exterior glass on all reachable elevations
• Interior glass, where access allows
• Window frames and rubber gaskets
• Sills and cills
• Entrance doors and glass partitions
• Signage and fascia glass

Ask any contractor what their quote covers. The answer tells you a lot.

How do professionals clean business windows?

Professionals pick the access method first, then the cleaning method. Never the other way round.

Traditional squeegee work

This suits ground floor glass and shopfronts. The operative washes the pane with an applicator, pulls the water off with a squeegee, then dries the edges with a lint free cloth.

The kit matters more than people think. A 14 inch channel handles most retail panes. An 18 inch channel suits large curtain walling. Rubber comes in soft, medium and hard grades. Soft rubber stays flexible in cold weather. Hard rubber suits hot days.

Here is a detail most blogs miss. Too much detergent causes streaks. A professional bucket looks like slightly cloudy water, not bubble bath.

Water fed pole and pure water

This is the standard method for most UK commercial buildings today.

Tap water carries dissolved minerals. When it dries, those minerals stay behind as spots. A purification unit strips them out using reverse osmosis, deionising resin, or both. The clean water then dries clear with no squeegee needed.

We measure purity with a TDS meter. TDS stands for total dissolved solids.

Ask your contractor what TDS they run at. A real professional will know the number without checking.

The order of work

1. Turn the water on before the brush touches the glass.
2. Scrub the top frame first. That is where the dirt that runs down the pane sits.
3. Work the glass in overlapping passes, vertical then horizontal.
4. Rinse from top to bottom in a controlled sweep.
5. Rinse the sill and frame edge last.

Skip step two and the glass looks dirty again within days.

Which access method suits your building?

Your building decides the method, not your budget.

The Health and Safety Executive sets out a clear order. Avoid working at height where you can. If you cannot avoid it, prevent falls. If you cannot prevent them, reduce the distance and the harm.

That is why poles are the default in Britain. The operative stays on the ground.

One myth worth correcting

Ladders are not banned. The HSE says ladders should not be the automatic first choice. They remain legal for short jobs, after a proper assessment, with a footing device on firm ground.

Any firm that reaches for a ladder on a three storey office is telling you something about how they manage risk.

What to ask a high rise contractor

C-Thru works on ground to mid rise buildings across Leeds. We do not carry out rope access work. If your building needs it, here is what to demand from whoever does.

• Current IRATA cards for every technician on site
• A minimum of two operatives, as BS 7985 requires
• Certified anchor points with in date test records
• A written rescue plan, not just a risk assessment
• The last LOLER report if the building has a cradle

If a contractor cannot produce these within a day, keep looking.

How often should commercial windows be cleaned?

There is no legal minimum. Frequency depends on what your building does and where it sits.

What changes the schedule

Some sites soil faster than others. Move up one step if any of these apply.

• Your building sits within 100 metres of a busy road. Brake dust and diesel soot are the main soiling load in Leeds and most UK cities.
• You are near a construction site.
• Trees or roosting birds overhang the glass. Bird mess is acidic and etches if left.
• A sprinkler or irrigation head sprays the glass. This is the most common cause of hard water damage we see on ground floor commercial glass.

North facing and sheltered elevations often need less. A tiered schedule saves money without letting standards slip.

Why under cleaning costs more

Dirt does not just sit on glass. Minerals bond to the surface over time. Left long enough, they etch into it.

Etched glass cannot be cleaned. It can only be polished by a specialist or replaced. A neglected building also needs a first clean at a higher rate, because it takes far longer than a routine visit.

Regular cleaning is cheaper per visit and protects the glass itself.

What affects the cost of a commercial clean?

Two quotes for the same building can differ by a wide margin. Here is why.

Access method. A pole clean costs far less than one needing a cherry picker or a rope team. Machine hire, delivery and a trained operator all add up.

Pane count and glass size. More glass means more time, more water and more labour.

Frequency. Regular contracts cost less per visit. One off cleans cost more, because the glass is dirtier and the setup happens only once.

Ground access. A narrow street or a blocked frontage can mean a permit, traffic management or an out of hours visit.

Site restrictions. Early starts, security escorts and tenant access all take time.

Condition on day one. A building neglected for years needs a first clean priced separately.

We price by time and quote by pane. Ask any contractor to explain their method. If they cannot, the number is a guess.

Can window cleaning damage your glass?

Yes, and toughened glass carries the highest risk.

During manufacture, glass is washed and then heated. If the washer is dirty, tiny particles fuse onto the surface. They are invisible to the eye. This is known as fabricating debris.

Drag a blade over that pane and the blade lifts a particle and pulls it across the glass. The result is a deep scratch that cannot be polished out.

How a careful contractor handles it:

• Treat all toughened glass as a scratch risk until proven otherwise.
• Never scrape a full pane. Test a small corner first and listen. Fabricating debris makes a gritty clicking sound.
• Stop straight away if that sound appears.
• Get a signed waiver before any work that needs scraping.

Glass types that need special care

• Self cleaning glass, such as Pilkington Activ, has a coating that detergent destroys. Pure water only.
• Tinted film is almost always fitted inside. Use a soft cloth. No blade, no abrasive pad.
• Laminated glass has a plastic layer between two panes. Solvent near the edge attacks it.
• Low emissivity units are common in newer builds. Always ask before choosing a method.

If a contractor cannot tell you what glass you have, they cannot choose a safe method for it.

What are your legal duties as a building owner?

The law does not only apply to the person holding the pole.

The Work at Height Regulations 2005 place duties on anyone who controls, arranges or organises work at height. That includes facility managers, landlords and managing agents who book a cleaner.

Key rules that apply to your building:

• Work at Height Regulations 2005. All work at height must be planned, supervised and done by competent people.
• LOLER 1998. Cradles and building maintenance units need a thorough examination at least every six months.
• PUWER 1998. All work equipment must be suitable, maintained and inspected.
• COSHH 2002. Any chemical used on your site needs an assessment and a safety data sheet.
• Workplace Regulations 1992, regulation 16. Windows must be designed so they can be cleaned safely. Few building owners know this one exists.

Please note this guide explains general duties. It is not legal advice. For a specific site, speak to a qualified health and safety adviser.

What a proper paperwork pack contains

Ask for RAMS before work starts. That means risk assessment and method statement. A real pack includes:

1. A site specific risk assessment, not a template with your address typed in
2. A method statement describing the sequence of work
3. A reason why that access method was chosen over a safer one
4. A rescue plan where access equipment is used
5. COSHH assessments for every product
6. Equipment inspection records
7. Training cards with expiry dates
8. Insurance certificates

The insurance detail almost nobody checks

Most policies carry a height restriction.

A contractor may hold ten million pounds of public liability cover with a twelve metre working limit. On a taller building, they are not covered. Ask to see the certificate and read the height clause.

We send our insurance certificates with every quote. Ask us on 07757 173014 and we will email them the same day.

When does weather stop the work?

Safe contractors have a written weather policy. Here is ours.

Why we clean in light rain

Clients ask this often. Rain is naturally soft water. It carries almost no minerals, so it does not dirty clean glass.

What makes windows look dirty after rain is run off from unclean frames. That is exactly why we clean the top frame first on every pane. Light rain does not shorten the life of a proper clean.

How to choose a commercial window cleaner

Ask these nine questions. The answers separate a real contractor from a cheap one.

1. What does the quote include? Glass only, or frames, sills and doors?
2. Which access method will you use, and why not a safer one?
3. What TDS do you run at?
4. Can I see your RAMS pack?
5. What certifications do your operatives hold, and when do they expire?
6. What are your insurance levels, and is there a height restriction?
7. What happens if weather cancels a visit?
8. Is the first clean priced separately?
9. What is excluded from the price?

Write the answers down. Then compare quotes properly.

About the author

Philip Scott, C-Thru Cleaning

I clean commercial glass across Leeds and West Yorkshire. My work covers shopfronts, offices, schools, care homes and industrial units. C-Thru Cleaning handles external work alongside an internal cleaning team, so a site can be covered inside and out.

We work mainly with water fed pole systems, plus traditional methods at ground level. Our staff wear uniform, so you always know who is on your property.

One thing I have learned over the years. Most complaints about a bad clean are not bad cleans at all. They are frequency problems, frame problems or glass damage, reported as a cleaning fault. A contractor who knows the difference saves you money.

Call 07757 173014 or visit c-thrucleaning.co.uk.

Frequently asked questions

How often should office windows be cleaned?

Most city centre offices suit monthly cleaning at ground level and quarterly on upper floors. Business parks often manage with six to eight week intervals. Traffic, trees and nearby building work all shorten the gap.

How high can a water fed pole reach?

Around 20 metres, or 60 feet, from ground level. That covers roughly five or six storeys. In practice, wind and pole control usually limit the work before the pole runs out of length.

Is there a legal requirement to clean windows at work?

Not for cleanliness itself. But the Workplace Regulations 1992 require windows to be built so they can be cleaned safely. The Work at Height Regulations 2005 give you duties when you arrange the work.

Why do commercial cleaners start so early?

Early starts avoid disruption. We finish shopfronts before opening and offices before staff arrive. It also means fewer people walking through the work area, which is safer for everyone.

Can hard water stains be removed from glass?

Sometimes. Wet the glass first. If the mark vanishes when wet, it is a surface deposit and can be removed. If it stays visible when wet, the glass is etched and needs polishing or replacing.

Do you clean the inside as well?

Yes, where access allows. Interior glass usually needs less frequent attention than exterior, except in food, healthcare and retail settings.

Do you clean gutters too?

Yes. We offer low cost guttering services alongside window cleaning, plus gardening and general handyman tasks. Booking both together saves a separate visit.

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Every building is different. A photo or a five minute walk round tells us more than any online form.

We serve Leeds and the surrounding areas of West Yorkshire.

You get a written quote, our insurance certificates and our paperwork before any work starts.