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Construction humanoid robots should be bought against a defined task, route and risk assessment—not because a machine has two arms and two legs. The evidence currently available does not establish a construction-ready humanoid with independently verified payload, loaded runtime, ingress protection and site-safety results on common test conditions. Treat published specifications as starting points, then require a site pilot with written acceptance criteria before deployment.
This guide explains how to compare carrying capacity, productive runtime, dust and water protection, emergency behavior, integration evidence and service support. The product figures below are cross-category reference data from manufacturer or company filings; they are not proof that any listed machine is suitable for construction work.
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These are published reference points, not construction recommendations. The first entry is a logistics/manufacturing humanoid claim; the others are quadrupeds included to show why load, runtime and configuration must be compared on like-for-like conditions.
| Name | Best for | Key spec | Platforms | Checked |
|---|---|---|---|---|
| Digit v4 | Humanoid logistics/manufacturing reference | 35 lb carrying capacity; four-hour runtime with autonomous charging; 360-degree sensing (company filing) | Biped humanoid | November 2026 |
| Unitree As2 | Illustrating standing versus walking load | Up to 65 kg standing payload; about 15 kg continuous walking payload; more than four hours unloaded and about 2.5 hours carrying 15 kg; IP54 | Quadruped | November 2026 |
| Unitree A2 | Illustrating loaded runtime and configuration-dependent IP claims | More than five hours unloaded; more than three hours with 25 kg; IP56 on one configuration and IP56–IP67 on another (core components IP67) | Quadruped | November 2026 |
Sources: Agility Robotics’ Form S-1 filing, the Unitree As2 product page and the Unitree A2 product page.
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What is the right way to buy a construction humanoid robot?
Start with the job, not the robot. Define the material or tool, mass, grip, reach, walking route, floor conditions, cycle time, weather exposure, interaction with people and the consequence of a dropped or uncontrolled load. Then ask suppliers to demonstrate that exact task and provide measured acceptance results for the proposed configuration.
A humanoid form can help a machine use stairs, doors or tools designed for people, but shape alone says nothing about structural capacity, balance on uneven ground, battery endurance or safe behavior around workers. The reviewed primary sources do not provide a matched, independently verified construction benchmark. A procurement decision should therefore be conditional on a documented pilot, not on a headline specification.
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Use the payload available at the required reach and motion. A “maximum payload” may mean a static load while standing, an arm payload at a particular joint position, or a lower load that can be carried continuously while walking. These are different capabilities and cannot be substituted for one another.
Separate the load cases
- Standing payload: the mass a robot can support while stationary on a specified surface and posture.
- Manipulation payload: the tool or object an arm can hold at a stated reach, orientation and speed.
- Walking payload: the mass carried while stepping, turning, stopping and recovering balance.
- Continuous-duty payload: the load that can be handled repeatedly without thermal, battery or actuator limits reducing performance.
The As2 page illustrates the difference: it reports up to 65 kg standing payload but about 15 kg for continuous walking. Those figures are useful as a warning against reading the larger number as a mobile carrying rating; As2 is also a quadruped, not a construction humanoid. Obtain the same breakdown for any humanoid proposal.
Require a payload test sheet
Ask for payload values at full arm extension and at the center of gravity of the actual load. Include acceleration, deceleration, turning, stairs, ramps, slips, uneven slabs and the planned tool. A 10 kg drill, for example, can impose a more difficult torque and vibration demand than a compact 10 kg box. Record allowable grip force, wrist torque, center-of-mass limits and the robot’s response when the load shifts.
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Have the supplier demonstrate a complete cycle: pick up, walk the real route, place the item, return, stop on command and recover from a permitted interruption. The acceptance record should state the load, route, floor, lighting, weather, operator actions, number of cycles and every exception. Without those details, a payload number is not a construction performance guarantee.
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How long can a humanoid robot work on a construction site?
Runtime must be measured under the intended loaded work cycle, including walking, manipulation, waiting, sensing and safety stops. Compare productive minutes per shift and charging or battery-swap downtime, not an unloaded laboratory figure with a loaded shift requirement.
Use a duty-cycle calculation
- List one representative cycle, such as fetch, carry, place and return.
- Measure or require the time and energy for each movement, including pauses and human handoffs.
- Apply the actual payload, route length, slopes, surface and temperature.
- Subtract charging, battery exchange, inspections, software updates and recovery time.
- Calculate how many completed cycles are needed per shift and what reserve is required for an unexpected delay.
For a simple planning model, productive shift coverage equals available battery minutes minus charging, swap and recovery downtime. Do not assume that “four hours” means four hours of carrying. The Digit v4 filing reports four-hour runtime with autonomous charging, while the As2 page reports more than four hours unloaded and about 2.5 hours carrying 15 kg. The A2 page reports more than five hours unloaded and more than three hours with a 25 kg load. These figures come from different products, platforms and test conditions, so they are examples of reporting conditions—not a common benchmark.
Questions about the battery system
- Is the stated runtime continuous motion, intermittent operation or an endurance estimate?
- What charge time restores a usable shift fraction?
- Can batteries be swapped safely at the site, and what is the rated cycle life?
- What happens when state of charge reaches the reserve threshold while the robot is carrying a load?
- Is a trained technician, spare battery and charging equipment included in the service plan?
Require a safe return, controlled handoff or parking behavior at low charge. A robot that reaches a charger but leaves a load in an access route can create a greater site risk than one with a shorter headline runtime.
Are construction humanoid robots waterproof or dustproof?
An IP code describes protection against specified ingress tests; it does not certify resistance to every construction environment. An IP rating alone does not establish suitability for abrasive silica dust, wet concrete, mud, impact, freezing temperatures, heat, underground work or a particular tool and sensor configuration.
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Read the entire environmental specification
Request the exact IP rating for the delivered configuration, the test basis, operating and storage temperature, humidity limits, altitude, cleaning method and exclusions. Confirm whether the rating applies to the complete robot, a sealed enclosure or only selected components. A supplier may list different ratings for different configurations, as the A2 product information does: one configuration is listed as IP56 and another as IP56–IP67, with core components at IP67. That variation makes configuration control essential.
Also ask about:
- Dust: particle size assumptions, abrasive wear, filter replacement and post-shift cleaning.
- Water: rain, hose spray, standing water, concrete slurry and immersion limits.
- Impact: drop, collision and falling-object protections for housing, cameras and joints.
- Temperature: effects on batteries, lubricants, sensors, displays and charging.
- Ground conditions: loose aggregate, rebar, temporary flooring, mud, stairs and ramps.
- Location: tunnels, pits, confined areas and sites where communications or satellite positioning are unreliable.
Have the integrator identify environmental exclusions on the site plan. If a task moves between a dry interior and an exposed structure, acceptance should cover both conditions or restrict operation to the qualified zone.
What safety features should a construction robot have?
Safety has two layers: the robot itself and the integrated application in which it operates. A robot-level feature list cannot prove that the complete work cell, route, tooling, people, barriers and procedures are safe.
Use the current ISO distinction
ISO 10218-1:2025 addresses safety requirements for industrial robots as partly completed machinery. Its scope notes that integration and application requirements are covered by Part 2 and lists exclusions, including underground use, severe conditions outside manufacturer specifications and robots fixed to or part of mobile platforms. A qualified safety professional must determine how the standard applies to a particular mobile humanoid and construction deployment.
ISO 10218-2:2025 covers integration of industrial robot applications and robot cells through design, integration, commissioning, operation, maintenance and decommissioning. ISO describes it as specifying “requirements for the integration of industrial robot applications and industrial robot cells.” That application-level evidence is the part a construction buyer needs for the actual task and site.
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Safety evidence to request
- Task-specific hazard assessment covering workers, visitors, trades, vehicles, tools and materials.
- Stopping distance and stopping time for every operating mode, speed and payload.
- Emergency-stop locations, reset behavior and what remains energized after a stop.
- Protective separation, speed and force limits, reduced-speed teaching and other safe modes.
- Detection of people, unexpected obstacles, lost communications, localization errors and sensor obstruction.
- Procedures for a fallen robot, trapped load, software fault, low battery and manual recovery.
- Operator, supervisor and maintenance training records, including competence after software updates.
- Inspection, maintenance, incident logging and decommissioning procedures.
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What should a construction robot site pilot include?
The pilot should reproduce the intended task and define pass/fail criteria before the robot arrives. It is procurement evidence, not a marketing demonstration.
- Write the task statement. Specify object or tool, mass, dimensions, grip, destination, route, cycle frequency and human interaction.
- Freeze the configuration. Record robot model, software version, end effector, batteries, sensors, protective devices and environmental limits.
- Map the work area. Mark stairs, slopes, edges, overhead hazards, exclusion zones, vehicle paths, charging points and emergency access.
- Define acceptance metrics. Set minimum completed cycles, payload at full reach, uptime, safe stops, recovery time, charge or swap time and maximum exception rate.
- Run normal and abnormal scenarios. Include an obstacle, a lost communication link, a blocked route, a low-battery return, a dropped object and an emergency stop.
- Document every event. Log timestamps, load, route, operator intervention, alarms, stops, damage and environmental conditions.
- Review residual risk. The site safety lead and integrator should approve controls and restrictions before production use.
Do not expand from a controlled indoor trial to an exposed structure without a new assessment. Changes in flooring, weather, lighting, tools, software or nearby trades can invalidate the original acceptance evidence.
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What availability, service and configuration details matter?
Availability and buying prices for a construction humanoid were not established in the reviewed evidence. Treat delivery dates, support promises and capability claims as contract terms that require confirmation for the exact configuration.
Ask for a named support contact, response times, spare-part inventory, battery replacement process, software-update policy, cybersecurity responsibilities, training scope and the integrator’s role in commissioning. Clarify who owns the risk assessment, who can change the operating envelope and who signs off after a firmware or tool change.
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Request configuration identifiers for every quoted specification. An IP rating, payload or runtime attached to a different battery, arm, sensor pack or software release should not appear in the acceptance certificate for your machine.
What are the common buying mistakes?
- Using standing payload as walking payload: require the load while moving, turning and stopping.
- Comparing unloaded endurance with a loaded shift: calculate the real duty cycle and downtime.
- Treating IP as a construction warranty: obtain environmental limits and exclusions for the delivered configuration.
- Buying a robot certificate instead of an application assessment: document the complete cell, route and lifecycle controls.
- Accepting a staged demonstration: test the actual tool, material, route and human interaction.
- Ignoring recovery: specify what happens after a fall, jam, low battery, network loss or emergency stop.
- Assuming a humanoid is automatically versatile: verify each task; a change of end effector or material can change the risk and payload.
- Expanding scope informally: require a review whenever software, hardware, location or operating conditions change.
How we picked the reference specifications
The comparison uses only the reviewed primary sources: a company filing, manufacturer product pages and the 2025 ISO standard pages. Figures are shown with their stated load, runtime, platform and configuration conditions. No source supplied an independently verified, common-condition construction humanoid benchmark, so the examples are deliberately labeled as references rather than ranked construction products.
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Can a robot with an IP67 component rating work in rain and concrete slurry?
Not automatically. IP67 for a component does not prove that the assembled robot, connectors, cameras, joints and battery system tolerate spray, abrasive slurry, cleaning chemicals or the site’s temperature range. Obtain the complete-configuration test basis and written exclusions.
What documentation should a contractor put in the purchase contract?
Specify the exact hardware and software configuration, task and route, payload at reach, loaded runtime, environmental envelope, stop behavior, training, maintenance response and pilot pass/fail criteria. Make any change to those conditions subject to a documented safety and acceptance review.
Does ISO 10218 certification make a mobile humanoid safe on a job site?
No. Part 1 concerns the robot, while Part 2 concerns integration of the application or cell across its lifecycle. Applicability to a mobile construction deployment depends on the actual platform, location and task, and must be assessed by qualified professionals.
How much battery reserve should a construction robot have?
There is no universal percentage because route length, load, temperature, charging access and recovery procedures differ. Set the reserve from the site pilot so the robot can complete a safe handoff or return after the longest credible delay, rather than stopping with a load in an active work area.
