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Will a robot vacuum cross your doorway? Measure the step before comparing centimetres
A robot advertised to cross a 6 cm threshold is not necessarily designed to climb a single 6 cm vertical edge. Sketch your doorway from the side first. Its shape matters as much as the largest number in the product title.
US and UK measurement guide; manufacturer examples from US/global documentation; documented guidance, no hands-on product tests.
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Record the whole threshold profile
Measure in millimetres with a ruler held against each rise, rather than adding every change of level into one height. For a stepped strip, record both rises and the horizontal distance between them. Photograph the side profile with the ruler visible so a manufacturer can assess the actual obstacle.
On small screens, scroll the table sideways.
| Record | What to write down | Why it matters |
|---|---|---|
| First and second rises | Each vertical change in mm; write “single” if there is only one. | A double-step rating describes a different shape from a wall-like single step. |
| Depth between rises | Horizontal tread or gap length in mm. | The robot needs space to position its wheels or climbing mechanism. |
| Surface and edge | Wood, metal, carpet or tile; square, rounded or sloped edge. | A headline height does not establish grip on your surface. |
| Approach and mode | Clear space on each side; vacuum-only or mopping; mats nearby. | Door frames, furniture and cleaning configuration change the real route. |
Also mark the descent and return journey. Crossing once into a room is less useful if the robot cannot come back to its dock. Staircases and drop-offs require the machine’s own exclusion and safety instructions; a threshold rating does not make them navigable.
Compare single and double claims separately
The following are manufacturer figures checked on 11 October 2026, not Everyday Sift test results. They are examples from US or global documentation. They do not establish that a similarly named UK bundle has the same specification, stock or warranty.
On small screens, scroll the table sideways.
| Documented model | Single step | Double step | Source limitation |
|---|---|---|---|
| Roborock Saros 10R | Up to 3 cm in the global launch description. | 3 cm + 1 cm in Roborock’s US comparison. | Match the exact regional unit and its current instructions. |
| Dreame X50 Ultra | Up to 4.2 cm. | Up to 6 cm, with a gap between steps greater than 4 cm. | US product footnote; in-house lab conditions and environmental variation. |
| Dreame X60 series | 4.5 cm in Dreame’s US comparison. | 8.8 cm in that comparison. | Series comparison alone does not establish every local SKU’s geometry limits. |
Sources: Saros 10R global launch, Roborock’s US comparison, X50 Ultra product footnotes and Dreame’s X60/X50 comparison.
For example, a single 5 cm square rise exceeds the X50 Ultra’s stated 4.2 cm single-step figure even though 5 is below its 6 cm double-step headline. That is a reason to stop and ask about the measured profile, not an assurance that a more expensive robot will cross it.
Send a useful compatibility question
“I am buying [full model and regional SKU] in [US/UK]. My threshold has a first rise of [mm], a tread of [mm] and a second rise of [mm]. The surface is [material], with [mm] clear approach space. Can this model cross it in [vacuum/mop] mode in both directions? Which documented limit applies?”
Keep the written answer with the listing and return terms. If a seller quotes only a combined height, ask for the single-step limit and any spacing condition. US documentation is a starting point for a UK question, not proof of local compatibility.
Try the cheaper route when it is supported
- If your current robot already crosses reliably, a higher headline alone is no reason to replace it.
- If the maker supports a threshold ramp for your model and surface, compare that route before buying a new machine.
- Check that any ramp preserves door operation and a safe walking route; do not improvise one across stairs or an escape route.
- If no supported crossing solution fits, clean the separated room manually or move the robot according to its instructions.
Choose using the measured doorway, the exact machine and the documented conditions. A centimetre total cannot replace those three checks.