Clean sash windows.

Professional sash window cleaning is about more than just clear glass; it is essential maintenance for your home’s exterior. Regular cleaning prevents the build-up of grit in the sliding mechanism and protects the timber frames from premature rot caused by trapped moisture.

What Does the Work Involve?

• Initial Inspection: Checking the condition of the timber frames, glazing putty, and sash cords for any signs of rot or damage.
• Glass Cleaning: Removing grease, bird droppings, and mineral deposits from both internal and external panes using traditional squeegees or water-fed poles.
• Channel Clearing: Vacuuming or brushing out the sash box channels and debris from the sills to ensure the window slides smoothly.
• Hardware Polishing: Wiping down and polishing fasteners, lifts, and pulleys to maintain their appearance and function.
• Light Lubrication: Applying a small amount of silicone spray or wax to the tracks if they are sticking.
• Paint Spot Removal: Carefully scraping away old paint splashes from the glass using a professional-grade safety blade.

Typical Costs

The cost of cleaning sash windows is generally higher than standard windows due to the time required to clean multiple small panes (glazing bars) and the need to access internal tracks.

What affects the price? The primary drivers are the number of individual panes per window and the ease of access. A "six-over-six" window takes twice as long to clean as a "one-over-one" sash, and properties requiring scaffolding or high-reach equipment will see significantly higher quotes.

How Long Does It Take?

• Small 1-Bedroom Flat: 1–2 hours.
• 3-Bedroom Mid-Terrace: 3–5 hours (assuming 6–10 windows).
• Large Detached Period Home: 1 full day or more.
• Paint Removal: Can add 30–60 minutes per window depending on the severity.

DIY or Professional?

While ground-floor windows can be a DIY task, sash windows present unique challenges. They are often heavy, and reaching the top external pane from the inside (by "tilting" or sliding) can be dangerous without experience. Professionals use reach-and-wash systems or specialised ladders to ensure safety. Furthermore, if you have historic "cylinder" glass, it is thinner and more brittle than modern glass; a professional will know how to handle it without causing cracks. Note that all professional window cleaners must comply with the Work at Height Regulations 2005.

Choosing the Right Tradesperson

• Insurance: Ensure they have Public Liability Insurance (minimum £1m-£2m) that specifically covers working at height.
• Experience: Ask if they have experience with timber sash windows, as these require different care than uPVC.
• Equipment: Check if they use purified water systems (which leave a streak-free finish) or traditional methods.
• Red Flags: Avoid anyone who suggests using a pressure washer on timber frames, as this can force water into the sash box and cause rot.

Questions to ask: Do you clean the sills and the internal "pockets" as part of the price? Are you comfortable working around delicate original glazing? How do you handle windows that are currently painted shut?

UK Regulations

• Work at Height Regulations (2005): Contractors must plan work to avoid risks and use the right equipment.
• Conservation Areas: While cleaning doesn't require permission, any repairs identified during cleaning must often use "like-for-like" materials to meet local planning rules.
• Health & Safety: Professionals should provide a basic Risk Assessment if they are using ladders on a public pavement.

Common Problems

• Paint-Bound Sashes: If the window is painted shut, the cleaner may not be able to access the external glass from the inside or clean the tracks properly.
• Rotten Sills: Dirt often hides soft, rotten wood. A professional should report this to you immediately rather than cleaning over it.
• Damaged Putty: Old, brittle putty can fall out during cleaning; ensure your cleaner is gentle with historic frames.
• Broken Cords: If a sash cord is frayed, the weight of the window becomes dangerous. Check these before the cleaner arrives to avoid accidents.

Frequently Asked Questions