iRobot Roomba Plus 405 Review: An Affordable Vacuum and Mop Combo With Real LiDAR Mapping
Accurate room mapping, automatic mop-pad lifting over rugs and a self-emptying dock at an accessible price, with mixed reliability reports from some owners.
The Roomba Plus 405 pairs LiDAR-based mapping with a vacuum-and-mop combo, an AutoWash dock, and Matter support at a more accessible price point than iRobot's higher-tier models. Owners frequently praise the accurate mapping, the automatic mop-pad lifting over carpet, and how much time it saves on daily upkeep, while a vocal minority report reliability issues like lost WiFi connections, ignored schedules or inconsistent docking after the first month or two. It's a strong value pick for buyers who want a real vacuum-and-mop combo without paying flagship prices, as long as you're prepared to troubleshoot occasional software quirks.
- Budget-conscious buyers wanting vacuum and mop in one
- Pet owners dealing with daily shedding
- Homes with mixed hard floors and rugs
- Buyers who want Matter and smart home flexibility
Pros
- Accurate LiDAR mapping with multi-room support and no-go zones
- Automatic mop-pad washing and drying at the AutoWash dock
- Mop pads automatically lift over carpet to avoid soaking rugs
- Google Home, Alexa, Apple HomeKit and Matter support
- Strong day-to-day pickup of pet hair according to owners
Cons
- 2.4GHz WiFi only, no 5GHz, Bluetooth, Z-Wave, Zigbee or Thread
- Some owners report WiFi drops, ignored schedules or docking issues after initial use
- No printed manual, setup and instructions live entirely in the app
- Cleaning noise bothers a portion of owners
Who is the Roomba Plus 405 for?
The Plus 405 targets buyers who want the core benefits of iRobot's combo lineup, LiDAR mapping, automated mopping, and a self-emptying dock, without stepping up to a flagship price. It supports carpet cleaning, multi-room mapping and no-go zones, and its mop pads automatically lift when carpet is detected so rugs don't get soaked. With Google Home, Alexa, Apple HomeKit and Matter support plus IFTTT integration, it also suits buyers who want broader smart-home compatibility than some other models in the lineup offer.
What buyers love
Many owners highlight how much quieter and more accurate this model is compared to older Roombas they'd previously owned, crediting the LiDAR mapping for reliably building an accurate home layout. The auto mop-wash and auto mop-drying features (both supported per the spec sheet) come up repeatedly as a genuine convenience, letting the dock handle pad maintenance between runs. Buyers with pets specifically call out strong day-to-day pickup of shedding, and the automatic detection of carpet versus hard floor for mopping decisions matches the JSON's auto-mop-lifting spec.
What to know before you buy
The clearest recurring complaint is inconsistent reliability for some units: a handful of owners describe the robot losing WiFi mid-run, ignoring scheduled routes, or having trouble finding its way back to the dock after the first month or so of otherwise normal use. A couple of reviewers also wished the cleaning noise were lower and noted the lack of a printed manual (setup and instructions live entirely in the companion app). The unit is 2.4GHz WiFi only, with no 5GHz, Bluetooth, Z-Wave, Zigbee or Thread support, so it needs a 2.4GHz network to pair.
Is the Roomba Plus 405 worth it?
For the price, the Plus 405 packs in real LiDAR navigation, automatic mopping with pad washing and drying, and a self-emptying dock, features that used to be reserved for pricier models. Most owners describe it as a genuine time-saver for daily upkeep, particularly with pets in the house, though the software reliability complaints from a minority of buyers are worth weighing if you want a completely hands-off experience from day one. Overall it's a compelling value for anyone wanting a combo vacuum and mop without a flagship price tag.
Frequently asked questions
Does the Roomba Plus 405 mop and vacuum in the same run?
Yes, it supports both vacuuming and mopping, and automatically lifts its mop pads when it detects carpet so rugs stay dry.
Does the Roomba Plus 405 work with Matter and Google Home?
Yes, it supports Matter, Google Home, Amazon Alexa, Apple HomeKit and IFTTT. It does not support Samsung SmartThings or Home Assistant.
How often do I need to empty the Roomba Plus 405?
It has a self-emptying dock, and the mop pads are automatically washed and dried at the dock as well, reducing manual maintenance between runs.
Is the Roomba Plus 405 reliable long-term?
Most owners report consistent performance, but a portion describe reliability issues emerging after the first month or two, such as WiFi drops or ignored schedules, so factor in some setup and troubleshooting patience.
What warranty does the Roomba Plus 405 come with?
It comes with a 1 year manufacturer warranty.
