Building maintenance units are the permanently installed access systems that make routine window cleaning and facade work possible on many of Toronto's tallest towers. Often shortened to BMUs, these roof-mounted machines carry a suspended cradle that lowers technicians safely down a building's exterior. For property managers responsible for high-rise glass, understanding how building maintenance units work, and what it takes to keep one certified, is central to planning safe and predictable exterior cleaning.
How Building Maintenance Units Work
A BMU is typically a track-mounted or fixed davit machine installed on the roof of a tower. It supports a powered cradle, or work platform, that is raised and lowered on wire ropes while technicians clean glass, inspect seals, or carry out light facade maintenance. Because the system is engineered for a specific building, it can reach faces and setbacks that portable equipment cannot, which is why so many Toronto high-rises rely on one.
BMU, Swing Stage, and Rope Access Compared
A permanent BMU is not the only way to reach a facade. Swing stages are temporary suspended platforms rigged from roof anchors, and rope access uses ropes and harnesses for direct descent. Each method has a place: BMUs suit tall towers with complex geometry and frequent cleaning cycles, swing stages suit periodic projects, and rope access suits fast, low-impact work. The right choice depends on building height, glass area, and how often the facade needs attention.
Inspection and Certification Requirements
In Ontario, suspended access equipment is regulated, and a BMU must be inspected and certified by qualified engineers on a defined schedule before it can carry workers. Load testing, structural review, and documentation are all part of keeping a unit compliant. Property managers should confirm that certification is current before any crew is scheduled, because an out-of-date BMU can halt a cleaning program overnight.
Planning Window Cleaning Around a BMU
Because a BMU services one building on a fixed track, cleaning cycles need to be sequenced around wind conditions, tenant activity, and the machine's reach. A good contractor maps the facade into drops, schedules around Toronto's weather windows, and coordinates roof access with building staff. Thoughtful planning keeps the glass consistently clean without repeated, disruptive mobilizations.
Maintaining the BMU Itself
The machine that keeps the facade clean needs care of its own. Wire ropes, controls, brakes, and cradle components wear over time and require scheduled servicing between certifications. Neglecting BMU maintenance risks unexpected downtime and safety issues, so it belongs on the building's long-term capital and maintenance plan, not just its cleaning calendar.
Working With a Qualified Crew
Operating a BMU safely calls for trained technicians who understand suspended access, fall protection, and rescue planning. Inceptra Building Services is fully insured and WSIB compliant, and our high-rise teams are trained to work from suspended platforms and by rope access across Toronto and the GTA. To plan a window cleaning program for your tower, Request a free quote.