How to measure — Will it fit?

Good guides need good numbers. Measure the clear opening, not the frame outer edge.

Doorways

Width — narrowest clear gap between architraves, with door open flat (usually 90°).
Height — floor to lowest point of the lintel or header.
Depth — wall thickness the item passes through (typically 10–20 cm).

Hallways

Measure at the narrowest point — radiators, skirting, and dado rails reduce usable width.
Ceiling height where a tall item might tilt.

Corners

Add a corner turn section where the path changes direction. The planner pivots at that landmark — measure both legs of the L as separate straights with their widths.

Stairs

Use the stair section for the flight or landing. Measure clear width and headroom above the tread nosing — headroom often drops on the turn.

Your item

Measure the overall bounding box. For sofas, include fixed arms. Use extra margin in the planner if the shape is not rectangular.