Robot vacuum buying guide

A robot vacuum cleans the floor on a schedule while you get on with something else. It will not replace a full-size vacuum for stairs, upholstery or deep cleaning, but it can keep everyday dust and crumbs under control. Models differ mainly in how they navigate, how they deal with the dirt they collect and whether they mop. This guide explains the specifications that matter and how to match them to your home.

Navigation: how the robot finds its way

Navigation decides whether a robot cleans methodically or bumps around at random, and it affects every other feature.

Lidar (laser) navigation

A spinning laser sensor, usually in a small turret on top, measures distances to walls and furniture and builds a map of the room. Lidar works in the dark and generally produces accurate maps. The turret adds height, so check the robot will fit under your sofa or bed.

Camera-based navigation

One or more cameras recognise features of the room to build a map. Camera systems can be lower profile, but may depend on reasonable lighting. Some also use the camera to recognise obstacles such as cables or shoes; if privacy matters to you, read how images are processed and stored.

Gyroscope and bump sensors

Entry-level robots may clean in patterns using motion sensors and bumpers without building a full map. They can do a good job in simple, open rooms but are less efficient in larger or cluttered homes and usually cannot offer room-by-room control.

A saved map unlocks the most useful features: cleaning one room at a time, no-go zones around pet bowls, and virtual walls.

Suction, brushes and floor types

Suction power is often quoted in pascals (Pa). It is a measure of pressure rather than cleaning results, and manufacturers do not always measure it the same way, so use it as a rough comparison within one brand's range rather than across brands.

Brushes matter as much. Rubber or combined rubber-and-bristle rollers are often marketed as resisting hair tangles; side brushes sweep edges and corners towards the main roller. If you have long hair or pets in the house, check how easy the roller is to remove and clean.

Think about your floors. Hard floors and low-pile rugs suit almost all robots. Thick rugs, deep-pile carpet, tassels and high thresholds can cause problems — check the maximum climbing height in the specifications against the thresholds in your home.

Self-emptying docks and dustbin size

A standard dock just charges the robot; you empty its small onboard dustbin by hand. A self-emptying dock sucks the dirt out of the robot into a larger bag or bin in the dock, so you empty it far less often.

Self-emptying docks are convenient but take up more floor space, can be loud while emptying and may use disposable bags that are an ongoing cost. Check the price and availability of replacement bags, filters and brushes before you buy.

Mopping

Many robots now include a mopping function. They range from a simple damp pad dragged behind the robot to rotating mop pads that lift automatically when the robot reaches carpet. Some docks also wash and dry the pads and refill the water tank.

Mopping robots are best at maintaining already-clean hard floors; they are not designed for sticky spills or ground-in dirt. If you have a lot of carpet, check whether the mop lifts or can be removed easily.

Battery, runtime and app features

Runtime is usually listed in minutes on the lowest power setting, so expect less on higher settings. For larger homes, look for "recharge and resume", which lets the robot return to its dock, recharge and carry on where it left off.

App features to consider:

• Room-by-room cleaning and scheduling.
• No-go zones and virtual walls.
• Multiple saved maps for homes with more than one floor.
• Voice assistant support, if you use one.
• Whether the robot still works without the app or an internet connection.

Key specs explained

Questions to ask before you buy

1. How much clutter is usually on my floors, and will I tidy cables and small items before it runs?
2. Will it fit under the furniture I want it to clean beneath?
3. Can it cross the thresholds and rugs in my home?
4. Do I want a self-emptying dock, and is there floor space for it near a socket?
5. How much do replacement bags, filters and brushes cost, and are they easy to buy?
6. Does it need an app and account to work, and what happens if the app is discontinued?

Frequently asked questions

Can a robot vacuum replace my normal vacuum cleaner?

For most homes it works best as a daily top-up between deeper cleans. It cannot do stairs, sofas or curtains, and it will struggle in cluttered rooms. Many people keep a cordless or upright vacuum for those jobs.

Do I need lidar?

Not necessarily, but some form of mapping is what enables room-by-room cleaning and no-go zones. If you only want a single open-plan area cleaned, a simpler robot may be enough.

Are self-emptying docks worth it?

They suit people who want to empty the robot as rarely as possible, including many pet owners. Weigh that convenience against the extra floor space, the noise while it empties and the cost of replacement bags.

Will it fall down the stairs?

Robots use cliff sensors to detect drops. They are designed to stop at edges, but very dark floors or rugs can confuse some sensors, so use the app's no-go zones or a physical barrier if you are unsure.

Prices & links

HotWhatHow compares live prices from retailers as they are connected to the site. When offers are available, we rank them by the total landed price — the item price plus standard delivery — and show when each price was last checked. Some retailer links are affiliate links; we may earn a commission, which never changes which offer we label as the cheapest. This guide is based on manufacturer specifications and general product information, not on our own use of the products.