High-Rise Window Cleaning: How it Actually Works (and why DIY is a bad idea)

Clean windows are one of the simplest ways to lift the overall impression of a commercial building — but on a high-rise, getting them clean (and keeping everyone safe while doing it) is a far more specialised job than most people realise.

The Access Methods Used

High-rise window cleaning typically relies on one of a few access methods, chosen based on the building’s design and site conditions:

• Rope access (abseiling): technicians descend the building face on certified ropes and harnesses, using anchor points fixed to the roof or building structure. This is often the fastest and most flexible method for tall or irregularly shaped buildings.
• Building Maintenance Units (BMUs): permanently installed cradle systems built into some high-rise designs, used where the building has been designed with one.
• Elevated Work Platforms (EWPs): used where ground access allows, generally on lower sections of a building.
• Squeegee and pole systems with safety lines: for lower-rise sections or internal windows.

What Goes Into the Job Beyond “Cleaning Glass”

A professional high-rise window clean involves a lot of preparation most people never see:

1. Risk assessment and site planning — identifying anchor points, wind conditions, pedestrian areas below, and any building-specific hazards.
2. Equipment and harness checks — every rope, harness, and anchor point is inspected before use.
3. Permits and notifications — coordinating with building management to manage tenant disruption, and sometimes notifying neighbouring properties or council where required.
4. The clean itself — using purified water systems, squeegees, and detailing tools suited to different glass types and frame materials.
5. Quality checks — a final pass to check streaking, frame marks, and overall finish before sign-off.

Why DIY (or Untrained Contractors) is a Serious Risk

Falls from height are one of the most common causes of serious workplace injury in New Zealand, and window cleaning at height is exactly the kind of task where shortcuts can have severe consequences. Beyond the safety risk, DIY or unqualified attempts often:

• Damage glass or frames with incorrect tools or techniques
• Leave streaking or residue from improper water and cleaning systems
• Create liability exposure for the property owner if an unqualified person is injured on-site
• Breach health and safety obligations under the Health and Safety at Work Act, which applies to property owners who engage or allow height-access work on their building

What to Look for in a High-Rise Window Cleaning Provider

• Certified, trained rope access or EWP technicians
• A documented health and safety system and risk assessment process
• Appropriate insurance
• Experience with your specific building type and glass

Goleman’s Approach

Goleman has been a specialist in high-rise window cleaning since 1993, with technicians trained and certified across rope access, EWP, and BMU operation. We deliver results for every shape, size, and type of glass — from straightforward office towers to complex, irregular facades — with minimal disruption to tenants and visitors. Request a free quote to find out what a professional clean would involve for your building.