Thresholds Limits For Robot Vacuums & Tips To Get Over Them

Robot vacuums, like the trusty iRobot Roomba, are built to handle a variety of obstacles with finesse. They can gracefully conquer ramps, inclines, bumps, and various thresholds, making them versatile cleaning warriors.

Now, when it comes to the Roomba’s threshold-tackling superpower, it can comfortably handle obstacles up to 5/8 inches or approximately 15.8mm in height. But what if you’ve got taller thresholds to deal with?

No worries! There are other robot vacuums out there designed to tackle even higher hurdles. We’ll dive into those and share some nifty tips to make sure your robot vacuum navigates your home like a pro. So, stay tuned for the scoop on high-threshold conquering bots and handy cleaning tricks!


Roomba says their robot vacuums can go over a threshold of 5/8in or 16.8mm.

But there are times a Roomba, especially newer ones, can clear up to 3/4in due to the height of the front bumper shown below.

The biggest factor that stops a robot vacuum from going over something is its sensors or, in this situation, the front bumper.

As you can see in the picture above, my Roomba 690 could clear 3/4in if it hits just right without triggering the front bumper to turn around. The problem is that there is plastic underneath that can get caught and stop the robot vacuum from clearing a threshold. I flipped my robot vacuum over to show you where it could get caught.

Best Robot Vacuums For Large Thresholds

The best robot vacuums that come to mind with some of the highest thresholds are Roborock robot vacuums. All models, except the S4, can go over 2cm (20mm) or about 0.79 inches.

For example, the Roborock S6 Pure Robot Vacuum (Amazon Link Ad) can get over thresholds of 2cm.


If the threshold is too large, there is not much you can do except split the cleaning up.

If the threshold is small enough, you can buy threshold ramps, some that can even match hardwood floors.

Thresholds are a big problem for people in wheelchairs or those who use walkers. You can buy threshold transition for wheelchairs like this (Amazon Link Ad) to get your robot vacuum over the thresholds.

Try A Low-Pile Rug or Runner

The solution that worked well for me was adding a runner over the threshold.

The runner is thin enough the robot vacuum has no issue going over and gives enough incline to get it over the threshold.

Not only that, but the runner cut down on wear and tear at that junction.

Over 1 inch

If you have thresholds over 1 inch, you’re not going to find a robot vacuum that can go over it.

You’ll need to look into ways to fix that, as any threshold over 1 inch is in “tripping hazard territory”.

You get to a point where a threshold is simply a step, and currently, there isn’t any robot vacuum on the market that can clean steps.

High-Pile Rugs

Robot vacuums and high pile rugs can be hit or miss from my testing.

I have some high-pile rugs that give me no issue and the robot vacuum can go over with ease. Then I have a few that give me issues, especially the ones with thicker and less flexible fibers.

This honestly can be a good thing, as I can use some high-pile rugs as walls to keep a robot vacuum out of a room. These rugs look better than the virtual walls or magnets that come with robot vacuums so it’s a win-win if you ask me.



Hello, I'm Lee from ""! Launched in 2016, my site addresses the online information gap about "robot vacuums" and "vacuum cleaners," areas where I have hands-on experience. Got questions about a post or topic? Feel free to comment or contact me (contact)!

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