Doorway widening for wheelchair access in Perth homes

Why doorway width decides which rooms stay usable

Doorway widening is one of the least glamorous home modifications and one of the most consequential. A bathroom can be beautifully rebuilt and still be unreachable. A bedroom can be perfectly laid out and still be off limits.

When someone starts using a wheelchair, walker or shower commode, the doorways decide which rooms of the house remain part of daily life and which quietly stop being used. At AccessAble Home Modifications, we see this pattern often across Perth. A family calls about a bathroom, and the first real problem is the 720 mm door leaf between the hallway and that bathroom.

The modification everyone is thinking about is not the one that unlocks the room.

Most Australian homes built before the 2000s were designed around an assumption that everyone in the household could walk, turn and sidestep without thinking about it. Internal doors were sized for people, not for equipment. A 720 mm or 770 mm door leaf was normal, and in some older Perth homes the internal doors are narrower again.

A manual wheelchair is typically 600 mm to 700 mm wide across the wheels, and a self-propelling user needs knuckle clearance on both sides. A walker is narrower, but the person using it moves less predictably and often needs to correct their line mid-doorway. A shower commode is wider than most people expect.

The result is that a door which technically fits the equipment can still cause knocks, scraped knuckles, damaged architraves and, more importantly, a loss of confidence that makes the person avoid the room.

This is why whether it fits is the wrong test. The right test is whether the person can pass through repeatedly, in both directions, without needing to line up perfectly first. That standard is what separates a technically accessible home from a genuinely usable one, and it is the same principle that underpins universal design thinking more broadly.

Clear opening width is not the same as door size

The single most common misunderstanding in this work is the difference between the door leaf width, the frame opening and the clear opening width. Clear opening width is measured with the door open at 90 degrees, from the face of the open door leaf to the opposite door stop. It is the space a person actually moves through.

The door leaf is always wider than the clear opening. Once you deduct the thickness of the open door, the door stops and any hardware, a standard hinged door typically loses around 40 mm.

A common 820 mm leaf delivers around 780 mm of clear opening, and a 720 mm bathroom door drops closer to 680 mm. To get a clear opening above 810 mm, the leaf itself has to be wider than a standard door.

The Livable Housing Design Standard in the National Construction Code uses 820 mm clear opening width as the benchmark for doorways in new dwellings, and AS 1428.1 sets 850 mm clear opening as the reference for accessible design. Existing home modifications are not automatically bound by either document, but both are useful benchmarks.

If the person uses a powered chair, needs assistance through the doorway, or approaches at an angle, aiming higher than the minimum is almost always the better decision. Before committing to structural work, measure the existing clear opening rather than the frame. The gap between what the plan says and what the tape measure says is where most disappointing outcomes begin.

What Perth wall construction means for doorway widening

Perth is a double brick city, and that matters more here than in most Australian markets. Established suburbs such as Melville, Fremantle, Como, Applecross and Bicton are dominated by double brick or brick veneer construction, often with masonry internal walls. Widening a doorway in a masonry wall means cutting brickwork, installing or extending a lintel, propping the load above, and making good the wall on both faces.

Newer homes in growth corridors such as Baldivis, Ellenbrook, Piara Waters and Canning Vale are more likely to have timber or steel stud internal walls, at least on upper floors. Stud walls are usually faster and less disruptive to widen, but they are not automatically simple. The stud may still be load bearing, and roof trusses or upper floor loads have to be carried across the new opening.

The practical takeaway is that no one can price or schedule a doorway widening job responsibly from a photograph. The wall has to be identified as load bearing or non load bearing, the construction type confirmed, and the structural solution decided before demolition.

In some cases an engineer's detail is required, and that is a normal part of doing the work properly rather than a sign that something has gone wrong. Homes built before the late 1980s may also contain asbestos-containing materials in wall sheeting, eaves or other locations. Where that risk exists, testing and licensed removal come before any cutting, and it is a delay worth accepting.

Alternatives worth checking before you widen

Structural widening is not always the first answer. Several lower-impact options can recover useful width, and a good assessment checks these before recommending brickwork.

Swing-clear or offset hinges move the open door leaf clear of the opening and typically recover 25 mm to 50 mm. On a door that is only marginally too narrow, this can be enough. Removing or reducing the door stop can recover a further 12 mm to 20 mm.

Rehanging the door to swing outward can transform a bathroom or bedroom where the inward swing is eating the exact space needed to turn. A cavity slider removes the door leaf from the opening entirely and is often the best long-term answer in tight hallways, provided the adjoining wall has room for the cavity and no services or windows conflict.

Barn-style sliders sit on the wall face instead and avoid cavity construction, though they need clear wall space beside the opening and do not seal as well. Occasionally the honest recommendation is to remove the door altogether. In an ensuite used by one person, or a laundry, a doorway with no door can be the safest and cheapest solution.

These options all sit within the broader set of home modifications we work through with a household, rather than being separate decisions made in isolation.

Approach angles, circulation space and the room beyond the door

Width alone does not make a doorway usable. How the person arrives at it matters just as much. A straight-on approach along a hallway needs less clear opening than a 90 degree turn out of a narrow corridor, because the turn consumes width that the doorway then has to give back.

Latch-side clearance is the detail most often missed. To pull a door open while seated, the person needs space beside the handle to position themselves and swing the door past their body. Without it, the doorway is wide enough on paper and unusable in practice.

Where the hallway cannot provide that clearance, a slider or an outward swing usually solves it better than extra width. The room on the other side has to be checked at the same time. Widening a bathroom doorway achieves very little if the vanity, toilet or shower screen leaves no turning space once the person is inside.

This is why doorway work is usually planned alongside the room it serves, particularly for an accessible bathroom. The path from the front door or garage to the room deserves the same review, because a widened bedroom doorway does not help if the person cannot get into the house safely in the first place. That is where ramps and level entry come into the same conversation.

What sits inside the wall

Doorway widening rarely stays a carpentry job. Light switches sit beside doorways almost by convention, and widening the opening usually means relocating them. Power points, data cabling, air conditioning ducting, plumbing in wet area walls and smoke alarm wiring can all sit in the affected zone.

None of these are difficult problems on their own. They become expensive when they are discovered after the wall is open and the trades are already on site. A pre-start check of the wall, ideally with the switchboard and any available plans reviewed, is the difference between a two day job and a two week one.

Ceiling and cornice work is the other common surprise. Widening an opening in a masonry wall usually disturbs the cornice line, and in some homes the ceiling above the opening will need patching and repainting across a wider area than the doorway itself.

Finishing details that decide whether the job looks right

A well-executed doorway widening should be invisible once it is finished. That outcome depends on details that are easy to defer and hard to retrofit.

Architraves need to match the rest of the house, which in older Perth homes often means a profile that is no longer stocked and has to be sourced or milled. Flooring has to be made good across the widened opening, and this is where tiled areas cause the most trouble, since original tiles are frequently unavailable. Planning a deliberate threshold detail is usually better than hoping for an invisible patch.

Threshold height is a safety issue rather than an aesthetic one. Any lip left at the doorway becomes a trip point for a walker user and a jolt for a wheelchair user, and a jolt at a doorway is where a lot of grab-and-steady incidents start. Transitions should be as close to level as the construction allows, with a shallow ramped edge where a height difference cannot be avoided.

Wall protection is worth considering on doorways that will see repeated equipment traffic. Corner guards and kick plates look industrial in a showroom and disappear in a real home once they are painted in, and they prevent the slow damage that otherwise makes a household feel like the modification was a compromise. The same thinking applies to grab rails and handrails, which work best when they are chosen to suit the house rather than added as an afterthought.

Planning checklist before doorway widening work starts

Work through these before anyone books a trade. Every item on the list is cheap to settle on paper and expensive to change once the wall is open.

• Measure the existing clear opening with the door at 90 degrees, not the frame or the door leaf.
• Confirm the equipment that will be used now and the equipment that may be used later.
• Identify the approach direction and whether a turn is required at the doorway.
• Check latch-side clearance on the pull side of the door.
• Establish whether the wall is load bearing and whether it is masonry or stud construction.
• Locate switches, power points, plumbing, ducting and cabling in the affected wall section.
• Test for asbestos-containing materials in homes built before the late 1980s.
• Price the alternatives, including swing-clear hinges, rehanging, door removal and a cavity slider.
• Decide the flooring transition and threshold detail before demolition, not after.
• Confirm the room beyond the door has usable circulation space once the person is inside.
• Agree how the household will use the space during the works, particularly if it is the only bathroom.

Getting the sequence right

Where a doorway widening sits inside a larger project, sequence matters. Structural work and services relocation come first, then wall and ceiling making good, then flooring, then finishes and hardware. Fitting a new door before the flooring is decided is a common and avoidable cause of rework.

If several doorways are being widened, doing them in one visit is almost always cheaper and less disruptive than treating them as separate jobs, even when only one is urgent today. The propping, protection and making-good setup is largely the same whether the crew widens one opening or three.