Roomba Plus 405 Combo
2 independent reviewsRead the findings →A mid-range iRobot vacuum and mop with spinning pads and a dock that empties, washes and dries. It's best suited to mostly hard-floored homes. It's weak on carpet, though, and leaves floors very wet after mopping.
Updated
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Where it sits in iRobot’s range
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What reviewers found
Two independent tests, and both came away disappointed. Vacuum Wars bought one and measured it over several weeks; BestReviews ran it in a two-level apartment with vinyl floors, rugs and carpet. Both found carpet cleaning and pet-hair pickup on carpet weak, and both had trouble with the mopping and the app. Everyday debris is where they part: Vacuum Wars found surface pickup more than adequate, while BestReviews saw bigger particles left on carpet.
Vacuum Wars, lab test, Several weeks · BestReviews, hands-on, Jan 2026
Hard floors
Reviewers rate it highlyHard floors are where it does best. Vacuum Wars found it swept up everything from fine to extra-large debris without scattering it, and BestReviews saw it clear most of the faux fur from smooth vinyl.
Carpet and rugs
Reviewers found problemsBoth testers found it weak on carpet. Vacuum Wars recorded the worst deep-carpet result it has seen from a Roomba, and BestReviews found it left about half the small particles on carpet and missed bigger ones.
Pet hair
Reviewers found problemsVacuum Wars recorded the lowest flattened pet-hair score it had seen, and BestReviews found it left about half the faux fur on carpet in standard mode. Hair on hard floors fared better.
Mopping
Reviewers found problemsIt leaves floors too wet. Vacuum Wars measured about five times the average water left behind, with only one water setting, and BestReviews found it spread a spill around rather than soaking it up and needed deep-clean mode for old stains.
Navigation and obstacles
Mixed resultsVacuum Wars was impressed by its quick laser mapping and coverage speed, but it has no camera for small objects. BestReviews found the first map basic and watched it tangle itself in cords twice in one run.
Dock and upkeep
Mixed resultsVacuum Wars called the washing dock a big step up from iRobot's earlier ones, though it lacks hot-water washing and hot-air drying. Emptying is loud for both Vacuum Wars and BestReviews, and BestReviews advises emptying dirty water often to stop smells.
App and software
Reviewers found problemsBoth testers found the new app a problem: buggy for Vacuum Wars, and confusingly laid out for BestReviews.
Noise
Reviewers found problemsThe dock is loud. BestReviews measured 80 to 85dB while it emptied the bin, and Vacuum Wars also found emptying louder than average.
Reliability and support
Not enough evidenceNone of the reviews we use has run it long-term or judged iRobot's support yet.
Value
Not enough evidenceNone of the reviews we use clearly judged its value for money.
Verdicts come from independent, hands-on, finished reviews. An area needs at least two of them before we say more than “Not enough evidence”. We don't score robots ourselves. How this works
Weak on carpet and pet hair
Vacuum Wars measured 58% pickup in its deep-carpet test against an average of 75%, the worst it had recorded from a Roomba, and the lowest flattened pet-hair score it had seen. BestReviews found it left about half the small particles and faux fur on carpet in standard mode. If your home is mostly carpet, or you have a shedding pet, this is the main reason to look elsewhere.
Fine on hard floors and surface mess
Vacuum Wars found it swept up everything from fine to extra-large debris on hard floors and carpet surfaces without scattering it. BestReviews saw it clear 90% to 95% of faux fur from smooth hard floors, but on carpet it missed medium and large particles. The testers used different debris, which may explain the gap. Hard-floor homes will get the most from it.
Mopping leaves floors too wet
Vacuum Wars recorded a record score on dried-on stains, but only because it puts down so much water: it left about five times the average amount behind, and there's just one water setting. BestReviews found it spread a water spill around rather than soaking it up, and needed the slower deep-clean mode to shift old stains. The pads do lift over carpet, so rugs stay dry.
Quick mapping, no obstacle sensing
Its laser mapping impressed Vacuum Wars, which measured its best-ever Roomba coverage speed. BestReviews found the first map basic, with no automatic room split, so expect to edit it. There's no camera for small objects, and BestReviews watched it tangle itself in cords twice in one run. Pick up cables before every clean.
Dock helps, app and noise don't
Vacuum Wars called the washing dock a big step up from iRobot's earlier ones, though it lacks hot-water washing and hot-air drying and was louder than average when emptying. BestReviews measured 80 to 85 decibels during emptying. The new app let both down: buggy for Vacuum Wars, and confusingly laid out for BestReviews.
Our take
Should you buy the Roomba Plus 405 Combo?
Best for: Homes with mostly hard floors that are kept clear of clutter. Skip it if: Pet hair embedded in carpet is your main cleaning problem.
hard to recommend beyond a mostly hard-floored home where the tidy dock appeals. The MOVA P10 Pro Ultra beat it in Vacuum Wars' direct comparison, and the Roborock Qrevo S5V is the one testers agree mops well.
The Plus 405 Combo is part of iRobot's rebuilt range, below the Plus 505 Combo. It maps with a laser rather than the old camera system, has two spinning mop pads that lift on carpet, and a dock that empties the bin, washes and dries the pads and refills the water. There's no camera for spotting cables or socks, and at 10.6cm tall it's not one for low sofas.
Both testers were disappointed. Vacuum Wars recorded the worst deep-carpet result it had seen from a Roomba and its lowest flattened pet-hair score, and BestReviews found it left about half the small particles and faux fur on carpet. Hard floors are where it does best. Vacuum Wars found it swept up everything without scattering, and BestReviews saw it clear most of the faux fur from vinyl. Mopping leaves floors wet, with Vacuum Wars measuring about five times the average water left behind and only one water setting. BestReviews watched it tangle itself in cords twice in one run. Both found the app a problem and emptying loud, and Vacuum Wars notes the dock has no hot water or hot-air drying.
Where to buy
Where to buy the Roomba Plus 405 Combo in United Kingdom
No United Kingdom price checked in the last 21 days. We re-check daily.
We’re still looking for more United Kingdom retailers for this model.
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Before you buy
The questions people ask about this one
Will it avoid cables and pet mess?
No. Vacuum Wars notes it has no front camera or laser for spotting objects, and BestReviews saw it tangle itself in cords twice in one run and need freeing. Clear the floor first, and don't run it unsupervised around pet accidents.
Does it fit under low furniture?
The robot is 10.6cm tall with a laser turret on top, per the specifications. That's taller than many newer robots, so measure the gap under your sofa and bed before you buy.
Can it leave the mops in the dock for carpet?
No, but it lifts the spinning pads when it senses carpet, per the specifications. Vacuum Wars says that lets it vacuum and mop mixed floors in the same run. Neither test measured how high the pads lift, so be careful with deep rugs.
How big is the dock, and is it loud?
It's 45cm deep, 31.5cm wide and 47.2cm tall, per the specifications. BestReviews measured 80 to 85 decibels while it emptied the bin, and Vacuum Wars also found emptying louder than average. Put it somewhere you won't mind the noise.
How often do I have to empty or refill anything?
iRobot claims 75 days between dust-bag changes and four weeks of mopping and pad washing, per the specifications. BestReviews advises emptying the dirty-water tank often to stop smells, and the heavy water use Vacuum Wars measured won't help the clean tank last.
Alternatives
Other robot vacuums to compare.
P10 Pro Ultra
Why consider it: Vacuum Wars compared it directly and found it covers big floors efficiently, with a well-automated dock.
The compromise: A lab found it leaves carpet edges dirty and struggles with embedded pet hair.
Qrevo S5V
Why consider it: Testers agree it mops well, and its dock takes care of most upkeep.
The compromise: It also misses small objects, and testers split on pet hair.
Omni C20
Why consider it: A slimmer robot with dock automation that's reliably good at vacuuming hard floors.
The compromise: Testers disagree about its mopping, and it can't spot small objects, so tidy up first.
Specs
Full specifications
Each specification names its source. Manufacturer claims are not independent test results; unconfirmed figures are labelled.
Owner reviews
Do you own the Roomba Plus 405 Combo?
Tell people how it’s held up: cleaning, maintenance, faults and support. Owner accounts are shown separately from independent reviews.
Sources
Where this page’s findings come from
Editorial reviews
- Vacuum Wars: Roomba Plus 405 Combo review: great hopes, OK results ↗Lab test, Several weeks
- BestReviews: iRobot Roomba Plus 405 home test ↗Hands-on
Sources
Videos
- Search YouTube for iRobot Roomba Plus 405 Combo ↗Search results may include company demonstrations or similar models. Check the source and model name; a demonstration is not an independent performance test.