Doors, Hardware And Operating Forces

A door is the element a resident interacts with more than any other, and it is specified more loosely than almost anything else in a dwelling.

Clear width is not door width

The dimension that matters is the clear opening with the door in the open position, measured at the narrowest point. The door leaf, the hinge offset and the stop all reduce it.

Which means a nominal door size does not answer the question. The detail does, and it is resolved in design rather than discovered on site. The circulation that leads up to it is set out in [doorways, corridors and circulation space](/blog/doorways-corridors-and-circulation-space).

The approach matters as much as the width

A door with adequate clear width and no space beside the handle is a door a wheelchair user cannot reach to operate.

So the latch side clearance is designed, on both sides of the door, with the direction of approach considered. A door into a bathroom approached along a corridor needs different space from one approached head on.

Hardware that can be operated with a closed fist

Lever handles rather than knobs, positioned at a consistent height, operable without a tight grip or a twist of the wrist.

**D pull handles** on sliding doors, positioned so the door can be moved from either end of its travel.

**Lever latches** on hinged doors, with a return toward the door so clothing does not catch.

**Privacy sets** that can be released from outside in an emergency, which is a specific requirement in supported accommodation rather than a preference.

The same reach and operation logic governs every control in the dwelling, which is the subject of [switches, outlets and reach ranges](/blog/switches-outlets-and-reach-ranges).

Opening force is the one that gets missed

Every door has a force required to open it, and that force comes from the closer, the seals, the hinges and the pressure difference across the door.

A fire door with a self closer is the common conflict: the closer has to shut the door reliably and the resident has to be able to open it. Resolving that is a specification exercise involving the closer type, the adjustment and sometimes a powered operator. It is not resolved by hoping.

Weather seals on an external door add force. A sealed dwelling with mechanical ventilation can produce a pressure difference that adds more, which connects to [ventilation and air quality in a sealed dwelling](/blog/ventilation-and-air-quality-in-a-sealed-dwelling).

Sliding versus hinged

**Sliding doors** use no floor space to operate, which makes them the better answer in tight bathrooms and ensuites. They need a clear track, a cavity or a surface mounted track, and hardware that stays smooth under daily use.

**Hinged doors** take more daily abuse and are easier to seal, and they need the swing space.

**Cavity sliders** have to be planned into the wall before the wall is built, which in a factory build means the decision sits in design documentation rather than in a later variation.

Why this is decided early

In a factory build the frame, the lining and the hardware blocking are installed in sequence. A cavity slider, a powered operator or a heavier door all change what goes into the wall.

Changing a door type after fabrication starts means opening a completed wall, which is the cost described in [changing a design after fabrication starts](/blog/changing-a-design-after-fabrication-starts).

What changes over time

Residents change, and doors are the element most often affected first.

So the provision for change is designed in: wall framing capable of taking a powered operator later, power available at the head of the door, and hardware that can be swapped without replacing the frame. That is the same principle as [designing for changing resident needs](/blog/designing-for-changing-resident-needs).

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