Door Facing Door Feng Shui

Two doors face each other when their openings overlap in plan view. That is a statement about geometry, not about mood, and it can be settled with a tape measure in about a minute. Take the centre line of each opening, measure the perpendicular distance between the two lines, and compare it with half the sum of the two widths. Smaller than that, and the openings overlap: someone standing in one doorway can see into the other room. Larger, and the doors do not face each other at all, whatever the floor plan suggests.

Two 80 cm doors therefore need 80 cm of offset before the openings stop overlapping. At 40 cm they still overlap by half, so the sightline survives, narrowed. That single number ends most arguments about hallway doors, and it also explains why so many labelled pairs turn out to be offset by 20 or 30 cm and to carry no sightline at all.

Sight is what the tradition is describing: an aligned pair exposes the far room to anyone standing in the near one. Air is the one that is usually a benefit — a straight path between two openings is cross-ventilation, and in a sealed flat with a single facade it may be the only cross-ventilation available, which indoor-air guidance treats as something to secure rather than to block. Sound travels through the wall and the door leaf far more than through the opening, so offsetting the doors does little for noise. Light is the fourth: an aligned pair doubles the daylight reaching the inner room.

The order matters when you decide what to do. If the complaint is that a room feels exposed, the axis is the problem and an offset or a screen addresses it. If the complaint is that the flat is stuffy, the axis is the cure, and blocking it makes the flat worse.

What an offset buys depends on how much of the opening still lines up. The table is the whole relationship, and it holds for any pair of doors of similar width.

A 5 cm shift is not an offset; it is a crooked wall. Where the wall is already built and the sightline is the actual problem, the honest options are a screen, which blocks sight without blocking air, or moving one door, which is rarely worth the cost for a bathroom.

A door leaf sweeps a quarter circle whose radius is the leaf width, so an 80 cm door needs 80 cm of clear floor in front of it. Two doors on the same corridor axis that open toward each other will collide if the corridor is narrower than roughly twice the leaf width plus the frames — and that is a real defect rather than a symbolic one, because it is the thing people actually hit.

Clear width is the other measurable limit. Accessible routes are commonly specified at 81 cm, and a 70 cm leaf standing open at 90° leaves less than that once the frame and the stop are counted. This is the one door clash with a code answer, and it is worth checking before any symbolic one.

A screen interrupts the sightline if it reaches eye height from where you stand, which in practice means about 150 cm, and it slows air without stopping it. What it does not do is reduce sound coming through the wall or the door leaf, and it does not change the pressure path in a sealed room.

If the complaint is noise, published ratings for interior doors sit near STC 20 for hollow-core and 28 to 30 for solid-core, and a 1 cm gap under the door gives back much of either. Weatherstripping and a door sweep do more than a screen, cost less, and are reversible.

Four situations get labelled and should not be. Doors at right angles have no shared axis. Doors offset by more than their own width have no overlap. Doors into rooms that are never occupied at the same time carry no practical sightline, whatever their geometry. And a through-draft that a sealed flat needs is ventilation, not leakage.

In each case the traditional rule has a precondition that is missing, and saying so is more useful than ranking the pair on a scale of danger. What is left after the geometry is two questions: does the arrangement expose a room you want private, and does it move air where you want air. Both are answerable on a walk-through, and neither needs an inventory of cures.