Robot vacuum buying guide 2026
Eight specs decide whether you use it daily or leave it in a cupboard. The one on the box is not among them.
The robot vacuum market has changed shape. Budget models now include LiDAR that genuinely works, mid-range models carry features that were flagship-only a year ago, and the top end has moved on to solving problems most homes do not have. That makes the buying decision easier than it was — provided you ignore the spec that manufacturers shout loudest about.
The short version
- Navigation is the spec that matters most. If a listing mentions bump sensors but not mapping, skip it.
- Suction matters far less than the number suggests. Most homes see no difference above roughly 10,000 Pa.
- Brush design beats suction for pet hair. Anti-tangle rubber, not bristles.
- Measure your furniture clearance before ordering. The most common regret is a robot that cannot reach under the sofa.
- Self-emptying docks buy convenience, not cleaning. Worth it for most people, but be clear about what you are paying for.
1. Navigation — where the real difference lies
Three systems exist, and the gap between them is much larger than the gap between suction figures.
| System | How it behaves |
|---|---|
| Random / bump | No map. Bounces around, misses areas, takes far longer. Avoid. |
| LiDAR | Spins a laser to map the home in minutes, cleans in straight lines, works in the dark. The current baseline. |
| LiDAR + AI vision | Adds a camera that recognises objects, so it drives around cables, socks and pet mess instead of eating them. |
The practical consequence of good navigation is that you stop tidying the floor before running the vacuum. That is the difference between a robot you use daily and one that lives in a cupboard.
2. Suction — the number that misleads
Pa measures static pressure in a sealed laboratory test with no brush fitted. It correlates with cleaning ability only loosely, because real performance depends on airflow, seal quality, brush design and how many passes the machine makes.
The suction race has escalated from 2,000 Pa entry models to 35,000 Pa flagships in a few years. In practice, a 25,000 Pa machine cleans almost identically to a 35,000 Pa one day to day. The extra only shows on medium-thick carpet, where weaker units leave dirt in the fibres.
Work out your band
Enter your floor type, pets and household size to see the minimum useful suction — and where the extra money should go instead.
Open the suction calculator →3. Brushes — the pet hair decision
If anything in your home sheds, this matters more than suction. Traditional bristle brushes wind long hair around the roller until it stops turning, which means cutting it free with scissors every week or two.
Anti-tangle designs — rubber or silicone fins, often split into two counter-rotating sections — cut or shed hair rather than collecting it. Some models add a comb that trims hair as the brush turns. On a spec sheet, look for the words tangle-free, anti-wrap or dual brush.
4. The dock — what you are actually buying
| Dock type | What it does |
|---|---|
| Charging only | Cheapest. You empty the onboard bin every one or two runs |
| Self-emptying | Empties into a sealed bag. Typically 30–60 days between interventions |
| Mop washing | Rinses the mop pad mid-clean. Prevents pushing dirty water around |
| Hot water + drying | Washes at high temperature and dries, avoiding a damp mop smell |
Docks are also large. Measure the space where it will live before ordering — a dock that does not fit the hallway corner is a permanent daily annoyance, and it is the fixture you will actually see every day.
5. Mopping — realistic expectations
Robot mopping handles light everyday dust and footprints well. It does not handle dried-on spills, and no current model replaces a proper mop for a kitchen after cooking.
The meaningful distinction is between a flat pad dragged behind the unit, which mostly redistributes water, and a spinning or rolling mop with active pressure, which actually scrubs. If mopping matters to you, that difference is worth more than any suction figure.
6. Physical dimensions — the overlooked spec
LiDAR turrets add two to three centimetres of height, which is often exactly the amount that stops a robot getting under a sofa or bed. Retractable-LiDAR and camera-based models are slimmer for this reason.
Threshold climbing matters if you have door bars or a raised room. Most models manage around 2cm; a few reach 4–5cm.
Check it physically fits
Furniture clearance, threshold height and dock space, before you order.
Open the fit checker →7. Battery and coverage
Advertised runtime assumes the quietest setting on bare floor. Carpet, turbo mode and a cluttered layout can cut effective coverage by a third or more. Larger homes need a model that returns to the dock, recharges and resumes where it stopped — check that specific phrase, since not all models do it.
8. What you can safely ignore
- Suction figures above your band. Paying for 35,000 Pa on hard floors buys noise, not cleanliness.
- Voice assistant integration. Almost nobody uses it after the first week.
- App features you will never open. Cleaning history graphs, mostly.
- Marketing terms for standard features. Every brand has a proprietary name for ordinary edge cleaning.
Where the price steps actually buy something
| Tier | What changes |
|---|---|
| Entry | LiDAR mapping, adequate suction, manual emptying. Fine for hard floors, no pets |
| Mid | Self-emptying dock, anti-tangle brush, better app control. The sweet spot for most homes |
| Upper mid | AI obstacle avoidance, mop washing, higher carpet suction |
| Flagship | Hot water washing, mop drying, retractable LiDAR, extreme threshold climbing. Convenience refinements |
For most households the mid tier covers the great majority of what a robot vacuum can do. The tiers above it add convenience rather than cleaner floors — which is worth paying for if you value the convenience, and worth skipping if you were expecting better cleaning.
Once you know which specs matter for your home, compare models that actually meet them rather than the ones marketed loudest. See robot vacuums → Advertising — we may earn a commission.
Common questions
How much should I spend on a robot vacuum?
The mid tier — LiDAR navigation, a self-emptying dock and an anti-tangle brush — covers most households well. Higher tiers add convenience features such as hot water mop washing rather than better cleaning.
Is a robot vacuum worth it?
It replaces routine passes between deep cleans rather than replacing cleaning altogether. Whether it pays for itself depends on how much time you currently spend vacuuming and what that time is worth to you.
Do robot vacuums work on carpet?
Yes, though performance varies with pile depth. Hard floors and low-pile rugs are handled easily by mid-range suction; thick or high-pile carpet is the one case where the highest suction figures show a genuine difference.
Can one robot vacuum clean two floors?
None of them climb stairs. You either carry it between floors, in which case check the model stores multiple maps, or buy one per floor.