Of all the ways a door order goes wrong, handing is the most common and the most annoying, because nothing about it is difficult. It is one piece of information — which side the hinges are on and which way the door swings — and getting it wrong means the door arrives, gets unwrapped, and goes back on the truck. On a pre-hung unit with factory-bored hardware, there is no fixing it on site.

Here is how to establish handing in about thirty seconds, with the one convention that causes almost all the confusion.

The rule: stand on the outside

Handing is described from the outside of the door — the side you approach from, the side the key goes in, the side the door swings away from when it opens inward. For an entry door that is the street side. For an interior door, the convention is the side from which the door is pushed open, or where a key or lock face sits.

Standing on that side:

• Hinges on your left, door swings away from you: left-hand (LH), inswing.
• Hinges on your right, door swings away from you: right-hand (RH), inswing.
• Hinges on your left, door swings toward you: left-hand reverse (LHR), outswing.
• Hinges on your right, door swings toward you: right-hand reverse (RHR), outswing.

“Reverse” is just the word for outswing. It does not mean the hinges moved.

The shortcut that works every time

Put your back against the hinge jamb, inside the opening, facing the way the door swings open. If the hinges are on your right, it is a right-hand door. Left, left-hand. This version survives the “which side am I meant to be standing on” problem entirely, which is where most mistakes come from.

Why it matters more than it sounds

The hardware is already cut

A pre-hung door comes with the hinge mortises routed into the jamb, the latch bore drilled at a set backset, and often the strike plate pocket cut. Those cuts are handed. A left-hand slab in a right-hand frame puts the hinge mortises on the wrong edge.

Some locks are handed too

Standard residential knobs and levers are usually reversible, and standard deadbolt latches are symmetrical. But mortise locks, multi-point gearboxes, panic hardware and many commercial levers are handed or need to be handed on site, and a few cannot be changed at all once set.

Weatherstripping and sills assume a direction

An inswing door uses a sill and sweep designed for water to be shed outward, with the weatherstrip on the jamb face. An outswing door uses different geometry, because the door closes against the stop from the other side. Fitting one as the other is how water finds its way in. On a Toronto entry this matters more than the hardware does, and it is one of the things worth sorting out before a front entrance door replacement is ordered.

Inswing or outswing: which should a Toronto entry be?

Most Canadian residential entries swing inward, and for good reasons in this climate:

• Snow and ice. An outswing door is blocked by anything that drifts or freezes against it. An inswing door is not.
• Hinges on the outside. Outswing doors expose the hinge barrels to the exterior, which needs non-removable pins or security studs.
• Screen and storm doors. These occupy the outside of the opening, which an outswing door needs for its own swing.

Outswing still has its place: a small vestibule with no room for the leaf, a door at the top of a tight stair, or a commercial exit where the code requires the door to swing in the direction of travel. The point is that it is a deliberate choice, not a default — and if you are changing it, the frame, sill and weatherstripping all change with it.

What to record before you order

Handing is one of five things that need to be right. Take all five at once:

• Handing — left or right, inswing or outswing, using the method above
• Slab size — width and height of the door itself, and its thickness (commonly 35 mm or 45 mm on residential doors)
• Jamb depth — the width of the frame from interior trim face to exterior trim face, which has to match your wall build-up
• Backset and bore — the distance from the door edge to the centre of the lock hole, and the hole diameter
• Rough opening — the framed opening in the wall, which determines whether a pre-hung unit fits at all

Write them down in that order and photograph the hinge side and the latch side. If you are getting quotes for door installation in Toronto, having all five means nobody has to guess, and the quotes become comparable.

When the handing is wrong on a door you already own

A slab in an existing frame can sometimes be re-handed: a flush slab with no decorative face and a symmetrical profile can be flipped, the hinges and latch re-mortised, and the bore reused if the backset matches. A door with a raised panel pattern, a glass lite that is not centred, or a bevelled edge cannot be flipped without it looking wrong, because the bevel and the pattern are directional.

Re-handing an existing frame is a bigger job: new hinge mortises in the jamb, a new strike pocket, and the stop relocated. It is sometimes worth doing when you are moving a door’s swing to free up wall space, and it is squarely residential door repair work rather than a DIY afternoon on a door you depend on for weather and security.

Frequently asked questions

Is left-hand the same as left-hinged?

Not reliably. Some suppliers describe doors by hinge side only and assume inswing. Others use the full LH / RH / LHR / RHR convention. When you order, state both facts in words — “hinges on the left as I face it from outside, swings into the house” — rather than trusting a single letter.

Does handing matter for an interior door?

Less, but it still matters. A flush interior slab is usually easy to re-hang either way, and a pre-hung interior unit is still handed. Where it really matters is in narrow halls, where the swing determines whether the door blocks a light switch or a second doorway.

Are deadbolts handed?

Most common residential deadbolts are not — the bolt is symmetrical. Multi-point systems with hooks and the gearboxes that drive them generally are.

Can I change an inswing door to outswing in the same opening?

Technically yes, practically rarely worth it. The sill, weatherstripping, hinge security and stop all have to change, and in this climate you are moving to the configuration that snow blocks. If space is the reason, a different door type is usually the better answer.

The short version

Stand with your back to the hinges, facing the way the door opens. Hinges right means right-hand. Then write down the slab size, jamb depth, backset and rough opening in the same breath — because handing is only the first of the five numbers that decide whether the door fits.