# Best Humanoid Robots to Buy Used in 2026
The humanoid and advanced robot category is unlike any other in the used market. It is the only category where prices are rising — the Unitree Go2 Pro is up 18.4% year on year on the Robot Resale Index. Demand from developers, researchers, and educational institutions is outpacing supply of early-production units with mature SDK ecosystems. The buyers who waited for prices to fall in 2025 are now paying more than those who bought.
This is also a category where the due diligence requirement scales with the price. At £2,000 for a used quadruped, an inspection mistake is a £300 joint repair or a £280 battery pack, not a £30 brush replacement. This guide covers what is available, what to pay, and what a proper pre-purchase inspection looks like.
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The landscape: what is actually available used in the UK
Quadruped robots (available now)
The used quadruped market in the UK is small but real. The Unitree Go2 Pro is the most liquid asset in this tier — enough units have been sold to support a genuine secondary market with pricing data. The Unitree Go2 Air (lower spec) also trades occasionally.
The Boston Dynamics Spot appears very rarely on the UK used market at £40,000–£70,000 depending on configuration — primarily from corporate and research sellers clearing surplus equipment. Specialist due diligence required.
Bipedal / humanoid (early market, very limited supply)
True bipedal humanoids are beginning to appear. The Unitree G1 (launched 2024, ~£14,000 new) has a handful of used units changing hands globally. Agility Robotics Digit (primarily US market, enterprise-only) is not practically available on the UK used market yet.
Our recommendation: Focus on the quadruped category for 2026. The used bipedal humanoid market has insufficient pricing history for reliable valuation, and due diligence without a qualified robotics engineer is difficult. The Unitree G1 is one to watch for 2027 as the used market matures.
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Unitree Go2 Pro: the benchmark used purchase
Our bench test of the Unitree Go2 Pro scored 8.2 out of 10 — the highest score in the advanced robot category. Read the full bench test.
Used price: £1,800–£2,300 for a unit with joints in good condition, battery under 200 cycles, and all sensors functioning. Retail is approximately £2,800.
Category value trend: +18.4% year on year — rising, not falling.
Why it is rising: The Go2 Pro includes 4D LIDAR, Intel RealSense depth camera, and full ROS2 and Python SDK support. The developer community has grown significantly around this hardware — it is used in university robotics labs across the UK and appears regularly at ROS workshops and hackathons. Units with mature SDK setups and documented lab histories command premium prices because buyers trust the provenance.
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The five checks that matter
1. Joint inspection (most important)
With power off, move each of the twelve joints manually — all four hips, four knees, and four ankles. Listen for clicking, grinding, or unusual resistance. Worn gear surfaces are the primary failure mode on quadruped robots and the most expensive repair. A single joint replacement can cost £200–£400 depending on the joint position and whether it requires a specialist engineer.
A unit from a research lab that ran structured experiments is statistically likely to have better joint condition than a consumer unit that ran obstacle courses or outdoor terrain. Ask about use history specifically.
2. Battery cycle count
Request the battery cycle count via the Unitree SDK before purchase. Target: under 200 cycles for a unit you expect to use heavily. Replacement battery packs for the Go2 Pro cost approximately £280 — factor this into your offer for anything above 200 cycles.
3. SDK account unlink
Confirm the seller has unlinked their Unitree SDK account from the unit. On the Go2 Pro, this is done via the Unitree SDK developer console. A linked account prevents you from pairing the robot to your own developer credentials. Ask for a screen recording of the account unlink process if you cannot verify in person.
4. Sensor output testing
Connect to the Go2 Pro's onboard computer and request a LIDAR scan. The 4D LIDAR should produce a complete 360° environmental map without significant gaps, dropouts, or unusual clustering artefacts. The Intel RealSense depth camera should produce clean depth maps at close, medium, and far range.
If either sensor shows anomalies, request a full sensor calibration log. Sensor replacement on advanced robotics platforms is a specialist job — budget £500–£1,500 depending on the sensor.
5. Provenance documentation
Ask for:
- Original purchase receipt (confirms manufacture date and first owner)
- Service records if maintained under an institutional programme
- Any firmware update log
- Confirmation of the SDK account unlink process
A university or research institute seller is typically more reliable than a private individual. Ask what the robot was used for, at what cadence, and whether it encountered outdoor terrain (higher joint wear) or primarily operated indoors on flat surfaces (lower wear).
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What to pay in 2026
| Unit | Condition | Expected price | |------|-----------|---------------| | Unitree Go2 Pro | Excellent, lab origin, under 100 cycles | £2,100–£2,300 | | Unitree Go2 Pro | Good, under 200 cycles, all sensors verified | £1,800–£2,100 | | Unitree Go2 Pro | Fair, 200–350 cycles, minor wear | £1,400–£1,700 | | Unitree Go2 Air | Good, standard spec | £900–£1,200 |
Prices above the £2,300 ceiling are rare and usually reflect unusual accessories (Unitree arm attachment, additional battery packs) or extremely low cycle counts from a lab that ran the unit very conservatively.
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The case for buying now vs. waiting
This is the only category where the data argues against waiting. In every other robot category on the Robot Resale Index, used prices are flat or declining — buying in six months gets you the same machine for less. In advanced robotics, the opposite is true: prices have risen 18.4% year on year and demand continues to outpace the supply of mature units.
The reason is SDK maturity. A Unitree Go2 Pro purchased in 2023 has three years of firmware updates, a well-tested ROS2 package ecosystem, and known quirks documented by the global developer community. A brand-new unit has none of that accumulated knowledge. For developers, the used unit with provenance is genuinely preferable to the new unit for certain research applications.
If you are evaluating a used Go2 Pro for a UK university or research project, the case for buying now rather than budgeting for next year's allocation is supported by the trend data.
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True humanoids in 2026: what to know
Bipedal humanoid robots are beginning to reach the secondary market globally, but the UK used market is not yet mature enough for reliable purchasing guidance. A few things to know:
Unitree G1: Launched 2024, priced ~£14,000–£16,000 new. Early used listings have appeared in the US at £11,000–£13,000. The UK used market has negligible supply as of September 2026. The G1 uses similar joint architecture to the Go2 — the same inspection methodology applies, with the added complexity of bipedal balance systems requiring specialist calibration.
Figure 01 / Agility Digit / Tesla Optimus: Enterprise-tier, not practically available to individual buyers on the UK used market. These platforms require service contracts and have manufacturer restrictions on resale. Not relevant for private or even most institutional buyers in 2026.
Our recommendation: The used humanoid robot market for non-institutional UK buyers in 2026 is the Unitree Go2 Pro family. Watch for the Go2 Pro's successor and the Unitree G1 to gain used market supply through 2027.
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Goldman Sachs' projection and what it means for buyers
Goldman Sachs' 2024 research projected a US$38bn humanoid robot market by 2035. The acceleration is real: Unitree, Figure, and Agility Robotics are all shipping units at increasing volume. For used buyers, this creates both an opportunity and a risk.
The opportunity: as new units ship faster, early-generation units enter the used market at sharper discounts. The Unitree Go2 Pro launched at a price accessible only to research budgets; used units at £1,800 are now within reach of individual developers.
The risk: rapid development cycles mean today's hardware may be two or three generations behind within three years. A used Go2 Pro at £2,000 today will not outperform a new unit in 2028. But for research and development work on the current platform — which has the widest developer community and the most mature ROS2 package ecosystem — the used Go2 Pro is the right purchase for the next 18–24 months.
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Resale price data updated September 2026 from the Robot Resale Index. Advanced robot prices are updated monthly given the faster-moving nature of this category.