How to measure a 90-degree turn

In this scenario, the crucial inputs are the real item box, the narrowest checkpoint and the space required to rotate. Manufacturer dimensions may exclude packaging, protruding handles and protective parts.

What to measure

1. The maximum width, depth and height of the carried box.
2. The actual clear opening of every doorway with the leaf fully open.
3. Corridor widths, turns, landings and the lowest overhead clearance.
4. Handles, radiators, rails, intercoms and other protrusions.

How to make the decision

A result with clearance is a starting point. A tight result requires disassembly, re-measurement or confirmation by the delivery team. A negative result identifies the checkpoint that needs changing or avoiding.

Limitations

Calculations assume a rigid rectangular box. A soft mattress can flex, while an irregular sofa may need another rotation method. Dimensions alone cannot determine weight handling or damage risk.