Updated: 13th August 2026
High-rise and complex buildings require reliable long-term access to their external façades for cleaning, inspection, repair and maintenance. Where regular access is needed across large areas of glazing or complex elevations, a Building Maintenance Unit (BMU) can provide a permanent, efficient and highly practical solution.
At Heightsafe, we design, install, inspect and maintain bespoke Building Maintenance Units for commercial, residential and mixed-use developments across the UK. Our systems are developed around the individual architecture, roof layout and maintenance requirements of each building, helping provide safe access while supporting long-term asset management.
From initial design coordination and structural integration through to installation, commissioning, servicing and ongoing maintenance, our experienced façade access specialists provide complete lifecycle support.
A Building Maintenance Unit, commonly referred to as a BMU, is a permanent mechanical façade access system designed to allow trained personnel to safely reach the external elevations of a building.
BMUs are often installed at roof level and can incorporate a suspended cradle or platform that travels vertically along the façade.
Depending on the system design, a BMU may also:
Building Maintenance Units are sometimes also described as:
These systems are commonly used on high-rise buildings where regular façade access is required and where a permanent mechanised solution offers greater practicality than relying solely on rope access or temporary access equipment.
A BMU provides controlled access from roof level to the external building façade.
A typical system operates as follows:
The precise configuration depends on:
Every system therefore needs to be designed around the building rather than selected as a standard product.
BMUs support a wide range of high-level maintenance activities.
Window Cleaning
High-rise glazing requires regular cleaning throughout the building lifecycle.
A BMU provides repeatable access to large areas of glazing without requiring extensive temporary access equipment each time maintenance is carried out.
This can make it an effective long-term solution for:
Façade Inspections
Regular inspections help identify defects before they develop into larger problems.
Building Maintenance Units can provide access for:
Glazing Replacement
Replacing large glazing panels can require specialist lifting and positioning equipment.
Some BMUs can be designed with additional capabilities to support glass replacement operations, allowing panels to be transported and positioned safely at height.
External Repairs and Maintenance
BMUs can also provide access for:
The system should always be designed around the real maintenance activities expected during the life of the building.
A Building Maintenance Unit is often best suited where façade access is required frequently and across a large or complex external surface.
BMUs may be appropriate where:
However, a BMU is not always the only option.
Depending on the building, alternative solutions may include:
The most suitable system should be determined through a full review of the building and its maintenance strategy.
A professionally designed BMU can provide significant long-term benefits.
Safe High-Rise Façade Access
BMUs provide a controlled means of accessing complex and elevated building façades.
Extensive Building Coverage
Track-mounted and articulated systems can provide access to large areas from a single unit.
Efficient Routine Maintenance
Regular window cleaning and façade inspections can be completed without repeatedly arranging temporary access.
Supports Glazing Replacement
Specialist systems can assist with the lifting and positioning of replacement glass.
Reduced Reliance on Temporary Access
A permanent solution can reduce repeated use of scaffolding, MEWPs and other temporary systems.
Architectural Integration
BMUs can be designed around the building to minimise visual impact.
Long-Term Maintenance Strategy
A well-maintained unit can support the building throughout many years of routine and reactive maintenance.
Whether you are designing a new high-rise development, reviewing an existing façade access strategy or replacing an ageing BMU, Heightsafe can help.
Our experienced team provides complete support from initial site surveys and feasibility studies through to bespoke design, structural coordination, installation, commissioning and long-term servicing.
We can also integrate Building Maintenance Units with wider Façade Access, Rope Access, Roof Access and Fall Protection Systems to create a complete long-term maintenance solution.
Contact Heightsafe today to discuss your BMU project, arrange a site survey or speak to one of our Façade Access specialists.
Building Maintenance Units require ongoing inspection, servicing and maintenance to remain safe and operational.
A planned maintenance programme may include:
Inspection and thorough examination requirements depend on:
Heightsafe provides specialist BMU inspection, servicing and maintenance support to help clients maintain safe, compliant façade access systems.
Building Maintenance Units form part of a wider Work at Height and lifting equipment strategy.
Work at Height Regulations 2005
Work involving BMUs must be properly planned, supervised and carried out by competent personnel using appropriate equipment.
LOLER
Where a BMU is used to lift people, relevant requirements under the Lifting Operations and Lifting Equipment Regulations (LOLER) may apply.
This can influence:
PUWER
The Provision and Use of Work Equipment Regulations (PUWER) may also apply to the suitability, maintenance and safe use of work equipment.
Manufacturer and System Requirements
Each BMU has its own operating and maintenance requirements.
These should be followed alongside applicable regulations and relevant standards throughout the equipment lifecycle.
Heightsafe provides complete façade access support throughout the lifecycle of a BMU.
Our services include:
Our wider expertise across Façade Access Systems, Rope Access, Davit Arms, Roof Access and Fall Protection allows us to consider the entire building maintenance strategy rather than treating the BMU as a standalone item.
This integrated approach helps clients develop systems that remain practical, safe and maintainable throughout the building lifecycle.
Get in touch with Heightsafe’s friendly, professional team today for free, no obligation advice on your Façade Access requirements.
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