Will the robot and dock fit? A practical measuring guide

A robot may enter the space under a sofa but become trapped farther inside. A dock may fit under a counter while leaving no room to remove its water tank. Measure the route and servicing movements, not just the product shell.

Use a tape measure, photographs and the manual for the exact variant. Work in millimetres and convert catalogue measurements before comparing them. Record where each measurement was taken.

1. Find the lowest point under furniture

Check the front, middle and rear. Look for cross-members, hanging fabric and cables. Tall legs do not guarantee equal clearance beneath the entire sofa. Normal loading can also change the available space.

Measure from the actual driving surface. A rug beneath the furniture reduces clearance. Nominal robot height is not a recommended opening height: documentation establishes operating conditions, while uneven floors remain a feature of your home.

Record the lowest result and photograph it with the tape visible. That gives a seller more useful information than “will it go under my sofa?”

2. Check every sensor position

Some robots move or retract a sensor. Confirm height in both positions, how retraction is activated and the conditions under which low-clearance travel works. Do not assume the robot always approaches in its lowest configuration.

For example, the official Roborock Saros 20 page lists a body measuring 353 × 350 × 79.8 mm. That describes the device; it does not recommend an opening exactly 79.8 mm high. Borderline clearance calls for documented requirements and a practical check, not convenient rounding.

A robot that can enter a space must also turn and leave it. Furniture supports can create traps that a single height figure does not describe.

3. Measure passages in both directions

A passage combines width, threshold geometry and manoeuvring room. Measure the narrowest point between skirting boards or chair legs, not only the doorway. Check whether the normally open door narrows the route.

Photograph the threshold from the side. Record height from each side, top width, edge shape and the approach surface. A two-step obstacle with a specified separation is not equivalent to a single vertical step of the same total height.

One successful crossing in a promotional video does not establish everyday access. The robot must return, sometimes from another angle or with a rug in a different position.

4. Draw the complete dock envelope

Mark the footprint using floor-safe tape. A cardboard mock-up can reveal a space conflict but cannot simulate navigation. Open nearby doors and check the socket and walking route.

Read how the tank, bag and tray are removed. Rehearse a similar movement with an empty box. There is no universal extra clearance that replaces the requirements of the particular product.

5. Confirm the dock variant

Tank-based and plumbed docks can have different sizes and installation requirements. The official Saros 20 page lists 381 × 475 × 488 mm for the standard dock and 381 × 475 × 300 mm for the refill-and-drainage version.

The lower version is not automatically easier to install. Water connections, hose routing and service access introduce further conditions. Keep the complete version name in your notes.

Do not commission cabinetry from a picture of another variant or a product intended for another market. With a plumbed system, check the installation specification before treating the available space as approved.

Worked example: fitting is not servicing

Suppose a recess is 500 mm high and a dock is 488 mm high. The difference is 12 mm. Sliding the housing into that gap does not answer whether its lid opens or a full tank can be lifted out.

If every refill requires moving the entire dock, everyday upkeep differs markedly from the clean-looking installation photograph. Evaluate that repeated task before building around the station.

Similarly, an 85 mm furniture clearance and a 79.8 mm robot leave a nominal difference of 5.2 mm. This guide does not label that a safe margin. Local unevenness and the device’s operating requirements still matter.

A measurement sheet for the seller

Ask for an answer addressing these measurements, not a general “should fit”. An unconfirmed critical dimension remains an uncertainty.

After delivery, use the home access and docking test. Before ordering, check the exact model and bundle.

Example product dimensions: Roborock Saros 20, checked 14 October 2026. Measuring procedures and calculations are editorial guidance, not a compatibility test of your home.