Mast Climbing Work Platforms — Safe Use on Site (2026)

What Is a Mast Climbing Work Platform?

An MCWP is a powered platform that climbs a fixed vertical mast, which is bolted to a base and tied back to the structure as it rises. The platform — often a long, modular deck that can run many metres along a wall — carries operatives and materials up and down the facade. Because the deck length can be extended, an MCWP lets a full bricklaying or cladding gang work side by side at the optimal height, with materials landed at deck level rather than carried up ladders or scaffold lifts. That is why they are popular on large facade jobs: brickwork, brick-slip and rainscreen cladding, render and external wall insulation.

Single-mast and twin-mast configurations are both common. A twin-mast unit spans two masts and supports a longer, heavier deck. The platform raises and lowers under power, so positioning is precise and operatives can keep the working face at a comfortable height all day rather than reaching up or bending over guardrails.

How MCWPs Differ from MEWPs and Scaffolding

It is easy to lump all access equipment together, but MCWPs sit in their own category and the differences matter for how you plan, inspect and supervise the work.

• Versus MEWPs (cherry pickers, scissor lifts): A MEWP is mobile and self-contained — it drives or is positioned, and the platform moves on booms or scissors. An MCWP runs on a fixed mast that is erected, tied to the structure, used, and then dismantled. It is effectively temporary works, planned and built for a specific facade, not driven around the site.
• Versus scaffolding: Like scaffolding, an MCWP is erected against the building and tied in. Unlike scaffolding, the working deck moves up and down under power, so the gang works from one adjustable level instead of a fixed series of lifts. This can be quicker to erect and gives a clearer, more productive working face — but it concentrates a heavy, moving load on the mast and ties.

Because the mast is erected and dismantled like temporary works, MCWP set-up, climbing (adding mast sections), tying and take-down are specialist operations — not something a general site team should improvise.

The Legal Framework

Three sets of regulations govern MCWP use, and you need to satisfy all of them.

• Work at Height Regulations 2005: Work at height must be properly planned, supervised and carried out by competent people, with equipment selected and used to prevent falls. This covers everything from erection to daily use of the platform.
• Provision and Use of Work Equipment Regulations 1998 (PUWER): The MCWP must be suitable for the task, maintained in efficient working order, and used only by people who have received adequate training. Controls, guards and protective devices must be present and functioning.
• Lifting Operations and Lifting Equipment Regulations 1998 (LOLER): An MCWP lifts people, so it is lifting equipment under LOLER. That means it must undergo thorough examination by a competent person — typically at least every 6 months for equipment that lifts people — and lifting operations must be planned, supervised and carried out safely.

Thorough examination is not the same as the routine inspection you carry out on site. Keep the current thorough examination report (the LOLER report of thorough examination) available, and do not use a platform whose examination has lapsed or that has a defect noted as requiring action.

Competence — Who Is Allowed to Do What

Competence is the single most important control with MCWPs. The people erecting, climbing (extending), altering, tying and dismantling the mast must be trained and competent installers — usually certificated by the manufacturer or a recognised training scheme — working to the manufacturer's instructions and an erection and dismantling plan. This is not work for a general labourer or a passing trade.

Operatives who simply use the platform — the bricklayers, cladders or renderers riding the deck — must be trained and authorised to operate it. They need to understand the controls, the safe working load, the wind shutdown limits, the gap to the facade, and the emergency lowering procedure. Untrained people must not operate the platform, and no one should alter or move the mast unless they are part of the competent installation team.

Key Hazards and Controls

Stability, Base and Ground Bearing

The whole system relies on a sound base. The mast must stand on firm, level ground capable of taking the load — on a properly designed base, spreader plates or foundation, never on soft ground, unconsolidated fill or near unsupported excavations. Ground conditions should be checked as part of the temporary works design, and the base re-checked if the weather or site changes things underfoot.

Ties to the Structure

As the mast rises it must be tied back to the building at the intervals specified by the manufacturer, and the free-standing (untied) height must never be exceeded. Ties carry the loads that stop the mast buckling or overturning. Fixing ties into sound substrate, at the correct spacing, is a core part of the erection plan — and a mast taken higher than its permitted free-standing height before the next tie is fitted is a classic precursor to collapse.

Overloading

MCWP collapses and overloading incidents have caused multiple fatalities in the UK and abroad, which is why loading discipline is non-negotiable. Every platform has a safe working load (SWL) covering people plus materials. That load must be evenly distributed along the deck — materials must not be piled at one end or concentrated over a single mast. It is dangerously easy to overload a long deck by landing a full pack of bricks or boards in one spot. Mark out loading positions, brief the gang on the limits, and control how materials are landed.

Edge Protection and the Gap to the Facade

The deck needs guardrails and toe boards to stop people and materials falling off the open side. On the facade side, the gap between the platform and the wall is a fall and dropped-object risk — it should be kept as small as practicable, and where it cannot, additional measures are needed to stop people or tools falling through. Manage tools and small materials so they cannot drop into the gap.

Overhead Power Lines and Obstructions

Because the platform rises up a facade, plan the route for overhead power lines, projecting features, balconies and other obstructions. Maintain safe clearances from live overhead lines and identify any points where the deck or load could snag as it climbs.

Weather and Wind

MCWPs have wind shutdown limits set by the manufacturer. Stop work and lower or secure the platform when wind speeds approach those limits — a long deck loaded with materials presents a large surface area and becomes unstable in high winds. Ice, heavy rain and storms also warrant a sensible stop.

Emergency Lowering and Rescue

There must be a means of lowering the platform in a power or control failure, and a rescue plan so anyone stranded at height can be brought down promptly. Operatives need to know the emergency lowering procedure, and the rescue arrangements should be in place and rehearsed before work starts — not improvised on the day.

Exclusion Zones Below

Materials and tools can fall from the deck or through the gap to the facade, so establish an exclusion zone beneath and around the platform. Keep people out from under the deck while it is in use, and barrier and sign the area clearly.

Handover, Inspection and Records

After erection, the MCWP should be formally handed over for use, with a record confirming it has been erected and tied correctly and is fit to operate. On top of the LOLER thorough examination, the platform must be inspected at the intervals required — including before use on each shift — with defects recorded and acted on. Keep the handover certificate, thorough examination report and inspection records on site, and never put a crew on a platform that has not been handed over and checked.

Quick Reference: MCWP Duties and Requirements

Getting It Right on Your Jobs

For brickwork, cladding and render crews, an MCWP can genuinely improve productivity and reduce the strain of working at height all day. But the speed only pays off if the discipline is there: a competent installer team, a proper base and tie regime, loading limits that everyone respects, edge protection and a clear gap to the facade, wind limits observed, and rescue arrangements ready. Treat the loading and tying as the two things that can never slip — overloading and missing ties are the failures that have killed people — and keep your thorough examination, handover and inspection records straight so you can prove the platform was safe to use.