# How to Sell Your Robot in the UK: The Complete 2025 Guide
Selling a used robot well is not complicated, but most sellers get it wrong in the same ways: they price from memory instead of data, they list without a battery health reading, and they photograph on a grey carpet with poor lighting. The result is a listing that sits unsold for weeks, attracts lowball offers, or sells at 20 to 30% below what the market would pay for a well-presented unit.
This guide covers how to check what your robot is actually worth, what documentation to include, how to photograph it, and where to list for the best net return.
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Step 1 — Find out what your robot is actually worth
The starting point is not what you paid or what it cost new. It is what verified secondhand units of the same model are achieving in the current market.
The Robot Resale Index tracks achieved sale prices across Robot AutoTrader's verified transaction database — not asking prices, not eBay "sold" listings that include failed auctions, but confirmed completed sales with condition verification. Check your model on the Resale Index before you set a price.
What you will find: the used price range (low to high), the year-on-year depreciation rate, and in many cases the optimal selling month. A Roborock S8 Pro Ultra currently trades at £580 to £720 used with the full dock — if you are listing without the dock, price accordingly (£100 to £150 less than the low end).
If your model is not yet in the Resale Index, use eBay's sold listings filter (tick "Sold items" in the left panel) to find comparable sales from the past 90 days. Ignore listings that did not sell — only completed transactions tell you what buyers will actually pay.
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Step 2 — Check and document the battery health
Battery health is the single most important trust signal for a used robot purchase. Buyers who see "battery health: 91% confirmed via Roborock app" will offer more and negotiate less than buyers who see "works perfectly" with no data.
iRobot models (Roomba): charge fully, run a complete clean cycle, and screenshot the battery indicator in the iRobot app. The app displays a health percentage and logged runtime.
Roborock models: open Settings → About in the Roborock app. Battery health is displayed directly. Take a screenshot.
Eufy models: the EufyHome app shows battery percentage but not full health data. Run the robot to empty on a clean hard floor and time the runtime. Compare against the manufacturer's rated runtime for the model.
3D printers: navigate to the firmware statistics menu and document the total print hours. Prusa MK4: Settings → Statistics. Bambu Lab P1S: in Bambu Studio, connect the printer and check the lifetime statistics.
Drones: check battery cycle count via the DJI Fly app (Settings → Battery → Cycle Count). Buyers specifically look for this.
Include the screenshot or a photo of the screen in your listing. It costs nothing and is the most effective way to command the high end of the price range.
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Step 3 — Gather all accessories
A complete listing commands 10 to 20% more than a bagged-loose equivalent. Collect everything:
- Original box and all packaging
- All cables, power supplies, and charging docks
- Every accessory from the original purchase (virtual walls, extra brushes, cleaning tools, spare filters)
- Any spare parts you have bought (extra batteries, replacement nozzles, backup brushes)
- The original receipt or proof of purchase (useful for buyers who want warranty transfer documentation)
For robot mowers: include the boundary wire map if you have one, a photo of the wire installation, and the Automower Connect app username you will transfer.
For 3D printers: include spare nozzles, any filament left from the original purchase, and any upgrade parts (PEI sheets, silicone socks, spare thermistors). These are worth £20 to £50 at retail but add more perceived value to a buyer than their market price suggests.
What you cannot find: mention it honestly in the listing. "Missing the original virtual walls — available on Amazon for £24" is a better listing than silence followed by a buyer complaint.
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Step 4 — Photograph it properly
Photography is the cheapest way to increase listing value. The principles:
Background: plain white or light grey. A sheet of white card behind the robot costs nothing and immediately looks more professional than a carpet or kitchen counter shot.
Lighting: natural daylight from a window. No flash (creates harsh shadows on sensor surfaces). Avoid overhead room lighting only — it flattens the photo and makes the robot look muddy.
Shots to include:
- Front-facing full robot on white background
- Bottom (show brushes, wheels, sensors — clean and in good condition)
- Dock or charging station (full dock, all cables visible)
- Accessories laid out flat — batteries, brushes, filters
- Battery health screenshot on a phone screen
- Any marks, scratches, or wear — photograph these honestly
Do not edit out blemishes. Undisclosed condition issues are the number one cause of post-sale disputes, returns, and negative reviews. Buyers will notice in person what they cannot see in photos.
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Step 5 — Write the listing honestly
The most trusted used listings are specific, not promotional. Buyers have been trained by years of eBay to be sceptical of "excellent condition, works perfectly". What earns trust is specificity:
Good listing copy: "Roborock S8 Pro Ultra with full RockDock. Battery health 88% (screenshot included). One owner, 14 months old. Bought February 2025, receipt available. Minor scuff on top panel from bumping a chair leg — shown in photo 5. All accessories included: dock, power cable, mop attachment, two spare mop pads, original box. Firmware current as of July 2026."
Weak listing copy: "Robot vacuum in great condition, selling as upgrading. Collection or postage. Any questions welcome."
The specific listing answers the buyer's questions before they ask them. It demonstrates that you know what you own. It sets the asking price in context. And it reduces the time you spend answering individual messages before a sale.
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Step 6 — Choose the right platform
Robot AutoTrader: free to list, specialist audience, every listing benchmarked against the Resale Index. The right platform for any robot worth over £150. Buyers on Robot AutoTrader are self-selected — they are looking for a robot and have done research. Less price sensitivity than horizontal marketplaces.
eBay: large reach, but 12.8% final value fees plus PayPal fees mean a £400 sale nets around £344. Best for unusual models or categories where a specialist audience is thin. Auction format works well for rare robots; fixed price works better for mainstream models.
Facebook Marketplace: free, local collection only. Good for heavy items (UR5e robot arms, large 3D printers) where postage is impractical. No buyer protection — cash or bank transfer only on collection. Avoid PayPal Friends and Family requests — these have no buyer or seller protection and are the standard request from scammers.
Gumtree: similar to Facebook Marketplace, lower traffic. Use as a secondary listing only.
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Step 7 — Time it right
The month you list affects the price you achieve. See the seasonal buying guide for the full category-by-category breakdown. Summary:
- Robot vacuums: list in September to November (buyers are active, spring supply has sold through)
- Robot mowers: list in March to April (spring buying season)
- Pool robots: list in May to June (pool season opens, buyers are motivated)
- Drones: list in October to November (autumn demand, pre-Christmas buying)
- 3D printers: list at any time — demand is year-round
Listing in the off-season is not fatal, but it means competing with more listings for fewer buyers. If you can wait, the timing improvement is worth 10 to 15%.
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Ready to list
List your robot on Robot AutoTrader — it is free, your listing is benchmarked against the Robot Resale Index, and verified buyers are actively searching for the models we cover. The listing form guides you through the condition fields that matter most to buyers.