Heavy-duty rack-and-pinion buck hoists for general contractors, high-rise builders, industrial plants, and major restoration work. Crews, tools and materials moving up the tower — configured to the job and tied in as the building climbs.
The fundamentals
A buck hoist is a temporary elevator bolted to the outside of a building under construction. It runs on a steel mast that is assembled section by section as the structure grows, and it is dismantled once the permanent lifts are commissioned. On drawings and in supplier catalogues the same machine is called a construction hoist, personnel hoist or material hoist.
What separates it from a crane or a cable elevator is the drive. There is no counterweight, no hoisting rope and no machine room. Instead, a toothed steel rack runs the full length of the mast, and the car carries its own motor-and-gearbox assemblies driving pinion gears that mesh with that rack. The car climbs itself, in the same way a cog railway climbs a mountain.
That design is why the hoist can be free-standing to a useful height off its base and then simply tied back to the structure at intervals as it goes higher, and why the mast can keep growing with the building rather than being sized for the finished height on day one.
Why the drive matters on site
Because drive force is generated at the pinion rather than by a rope over a sheave, a rack-and-pinion car has a positive mechanical engagement with the mast at all times. Overspeed protection acts directly against that same rack, which is the basis of the safety device fitted to personnel-rated units.
Configurations
Three decisions define the machine you end up with: how many cages share the mast, whether the unit is rated to carry people, and whether you need an enclosed car at all. Everything else is a variation on those.
One car, one mast
Two cars on a shared twin mast
Materials-focused, lower speed
This is the single most consequential classification on the whole machine, and it is not a matter of preference. A hoist rated to carry people is built to a different standard, carries different safety devices, and sits under a stricter inspection and testing regime than a materials-only unit.
A material hoist is not made compliant for riders by adding a gate or posting a sign. If crew are going to ride it, it has to be a personnel-rated unit from the outset, with the corresponding overspeed device, enclosure, interlocks and test records.
Get this decision right at the enquiry stage. It changes the equipment, the price, the erection scope and the paperwork.
Comparing units
Supplier data sheets list dozens of figures. In practice a handful decide whether a unit suits the job. Here is what each one is telling you, and the trap that goes with it.
| Specification | What it governs | What to watch for |
|---|---|---|
| Rated capacity | The maximum load the car may carry, given in weight and often also as a passenger count. | Weight and passenger ratings are not interchangeable. Confirm which governs for your mix of crew, tools and palletised material. |
| Car dimensions | Whether your actual loads fit: drywall sheets, pipe lengths, carts, pallets. | Internal clear dimensions and door opening, not overall envelope. A long load can be capacity-legal and still not fit. |
| Travel speed | Round-trip time, which drives how many crew the hoist can move in a shift. | Faster is not automatically better. Speed increases power draw and cost, and dwell time at landings often dominates the cycle. |
| Maximum hoisting height | How tall the mast can be built for that model and mast type. | Height ratings are tied to a specific mast section, tie-in spacing and wind assumption. Read the manufacturer's table for your exact configuration. |
| Free-standing height | How high the mast may stand before the first tie-in is required. | Determines whether the hoist can be useful before the structure is ready to receive tie-ins. |
| Tie-in spacing | The vertical interval between structural attachments up the mast. | Every tie-in is an embed, a bracket and a facade penetration to coordinate. Wider spacing means less trade interference. |
| Power requirement | Supply voltage, phase and current the drive needs at the base. | Get this to the electrical contractor early. Temporary power sizing is a common cause of hoist start-up delay. |
| Base footprint and loading | The pad or foundation the unit sits on, and the load it imposes. | Coordinate with slab design, below-grade structure and site logistics before the pad is poured. |
| Landing arrangement | How the car meets each floor: gates, ramps, landing platforms. | Landing openings, protection and gates are usually the contractor's scope, not the hoist supplier's. Confirm the split. |
Ratings vary substantially between manufacturers, models and mast configurations. Always work from the data plate and published tables for the specific unit being supplied rather than from generic figures.
Commercial
Most contractors rent, and for good reason. But the calculation turns on utilisation, not on the sticker price of the machine.
The hoist is on site for a defined window and comes off when the permanent lifts run. Rental packages typically bundle the specialist labour and the ongoing obligations that a contractor does not want to own.
Ownership pays off for contractors with continuous high-rise work, where the same mast inventory moves straight from one job to the next with little idle time in between.
Hoist quotes are rarely like-for-like out of the box. The monthly rate is the smallest part of the story. Ask every supplier to price the same scope so the numbers mean something:
Logistics
The hoist is one of the few pieces of plant that touches the structure, the facade, the temporary power distribution and the trade sequence all at once. Decisions made months before it arrives determine whether it helps or hinders.
The mast position sets which floor areas are served, where the landing openings fall, and which part of the facade stays open longest. Move it late and you are moving embeds, edge protection and the facade closure sequence with it.
The unit needs a level, engineered bearing surface capable of taking its loads. Where the hoist sits over a basement or podium slab, the loading has to be checked against that structure, not assumed.
Tie-ins recur up the full mast height at the manufacturer's spacing. Each one needs a structural attachment point and, later, a facade detail to close it out. Coordinating them with the frame drawings is far cheaper than retrofitting them.
Confirm voltage, phase and current with the supplier and give the electrical contractor a real number early. A hoist waiting on a power feed is a hoist not in service, and the schedule impact compounds daily.
Every served level needs an opening, edge protection, a landing gate and a clear route to the working area. Landing scope is often split between the hoist supplier and the contractor, so nail down the boundary in the contract.
Hoist sizing fails at shift start, shift end and break times, when every trade wants the car at once. Work from peak headcount and peak material movement to decide between single cage, dual cage or a second hoist.
The mast is extended in stages as the structure rises. Each jump takes the hoist out of service for a period, so it belongs on the programme rather than being treated as a surprise.
Compliance
A buck hoist carries people over a long vertical drop on an active construction site, which puts it squarely in the most heavily regulated tier of site plant. In the United States, hoisting and material handling equipment on construction sites falls under the OSHA construction standards, with 29 CFR 1926 Subpart N covering cranes, derricks, hoists, elevators and conveyors. The consensus standard most often referenced for personnel hoists is ANSI/ASSP A10.4, which addresses personnel hoists and employee elevators on construction and demolition sites.
Those documents govern how the equipment is built, inspected, tested and operated. Other jurisdictions run their own frameworks, and many states, provinces and cities layer additional permitting, third-party inspection or operator licensing on top. Verify what applies where you are building, because the requirements genuinely differ.
Treat the list below as the shape of the obligations, not as a compliance checklist. Work from the current text of the regulation and the manufacturer's manual for the specific unit.
The recurring failure
The commonest problems on hoists are not exotic. They are landing gates defeated or left open, riders on a material-only unit, loads that exceed the rating or are stacked so the car is unbalanced, inspection and test records that have lapsed, and untrained people operating the car. Every one of those is a procedural failure, not an equipment failure.
A governor-type device that arrests the car against the mast rack if it descends faster than its permitted speed. Personnel-rated units carry one, and it is subject to periodic testing.
Car gates and landing gates interlocked so the car cannot travel with a gate open and a landing gate cannot open unless the car is present.
The car is enclosed, the base is fenced against unauthorised entry and falling material, and every landing opening is protected.
Documented pre-use checks, periodic inspections and functional tests of the safety devices, held on site and current.
Only trained and authorised people operate the hoist, and everyone riding it knows the load limits and gate discipline.
Specialist work carried out by competent crews to the manufacturer's procedure, with the unit out of service and the area controlled.
Common questions
A buck hoist is the construction industry's everyday name for a temporary rack-and-pinion elevator erected on the outside of a building under construction. It carries workers, tools and materials between the ground and the working floors, and it comes down when the permanent elevators are commissioned. Manufacturers and standards documents usually call the same machine a construction hoist, personnel hoist or material hoist.
The term is jobsite vernacular rather than a technical classification, and it is used most heavily in North American commercial construction. Crews say buck hoist; the equipment data plate says personnel and materials hoist. If you are searching supplier catalogues you will find the same machines listed under construction hoist, rack and pinion hoist or transport platform.
In practice they are the same thing. Construction elevator, buck hoist, man lift and personnel hoist all describe a temporary, externally mounted car that runs on a mast. The distinction that actually matters is whether the unit is rated to carry people or is restricted to materials only, because the two categories are built, inspected and operated under different rules.
Mast height is built up in sections as the building rises, so the practical ceiling is set by the manufacturer's rating for that specific model and mast configuration rather than by the concept itself. Standard commercial units routinely serve tall high-rise structures, and greater heights are achieved with heavier mast sections, tighter tie-in spacing and engineered review. Always design to the manufacturer's published height and tie-in tables for the exact model on site.
Personnel hoists are operated by trained and designated personnel, and jurisdictions differ on the certification, licensing and inspection regime that applies. Beyond the operator, the erection, jumping, tie-in and dismantling crews are specialised trades. Confirm the requirements with your regulator and your equipment supplier before the unit is put into service.
Base setup and the first mast sections typically go up in a matter of days once the foundation and power are ready, and the mast is then climbed in stages as the structure rises. The schedule driver is rarely the hoist itself: it is the concrete pad cure, the power feed, the tie-in details and the landing openings being ready at each level.
Most general contractors rent, because the machine is on site for a fixed window and the rental package absorbs erection, jumping, service and inspection. Purchase makes sense for contractors with continuous back-to-back high-rise work, an in-house erection crew and somewhere to store and maintain the mast inventory between jobs.
Pricing is quoted per project rather than off a list, because the cost is driven by cage configuration, hoisting height, duration, mobilisation distance, erection and dismantling labour, and how many times the mast has to be jumped. Ask suppliers for a fully burdened number that includes mobilisation, erection, jumps, service visits and demobilisation so quotes are comparable.
Get a Quote
Send the basics of the project and we will point you in the right direction: hoisting height, floors to be served, peak crew size, whether the unit needs to be personnel-rated, and roughly how long it needs to be on site.
Specifying a unit
Working out whether single cage, dual cage or a transport platform fits the programme.
Comparing quotes
Making sure mobilisation, erection, jumps and service are priced on the same basis.
Planning the install
Base, tie-ins, power and landings, and when each needs to be ready.
BuckHoists.com is available to purchase. If you are in this industry and want the exact-match domain and this website, see the acquisition details.