Measure the wall before you choose a size

Start with the clear wall width, not the room width. A hallway often has a doorframe, a radiator, a switch or a piece of furniture that eats into the usable space. Measure between those fixed points and write the number down. That figure is the real constraint. A print that fits the room but crowds the door will feel wrong every time you pass it.

Check the height at the same time. Hallways are often shorter than main rooms, and a tall print can dominate a low ceiling. If the ceiling sits below 2.4 metres, keep the print height under roughly half the wall height. That leaves room above and below, which is what keeps a corridor from feeling boxed in.

Proportions that suit narrow corridors

A vertical format usually works better than a landscape in a narrow passage. The eye travels along the corridor, and a portrait orientation follows that movement without demanding extra width. A square can work if the wall is genuinely wide, but it tends to read as static in a tight space.

The safest rule is to leave empty wall on both sides of the print. A print that fills the full wall width from edge to edge will feel installed rather than placed. Two thirds of the clear width is a workable upper bound for most corridors. Below that, the print has room to breathe and the hallway still reads as a passage.

What changes the choice beyond the measurements

The image itself matters as much as the numbers. A crowded, high contrast composition can feel heavier than a quieter one of the same size, so a busy image may need more breathing room on the wall. A simpler composition can sit closer to the edges without feeling cramped.

Lighting changes the read too. A hallway lit from one side will flatten one edge of the print and emphasise the other. If the light is weak, a larger print can help the image hold its own, but only if the wall has the width to carry it. When in doubt, go smaller and leave the wall alone.