A door that scrapes the floor is one of those problems homeowners live with for months. You lift the handle a little, you shove with your hip, and eventually it becomes muscle memory. The trouble is that dragging is almost never the actual fault — it is the symptom of something that moved, and whatever moved is usually still moving.

Here is how to read the signs before a small adjustment turns into a full slab and frame replacement.

Start by finding where the door touches

Close the door slowly and watch the gap around the whole perimeter. That gap — the reveal — should be roughly even, about the width of a nickel, top to bottom and side to side. Where the reveal disappears tells you what failed.

Tight at the top of the latch side, dragging at the bottom of the latch side

This is the classic hinge sag pattern. The door has rotated slightly around the hinges, the top corner has pulled in toward the frame, and the opposite bottom corner has dropped onto the floor. Nine times out of ten the top hinge is the culprit, not the bottom one.

Even contact along the whole bottom edge

The door has not rotated — it has descended, or the floor has come up. Look for new flooring, a swollen subfloor near a bathroom or entry, or a threshold that has been shimmed by a previous repair.

Tight along the hinge side

The frame itself has shifted inward. That points at the structure around the opening rather than the door, and it is the one pattern worth taking seriously right away.

The four real causes

1. Hinge screws that never reached framing

Most factory door hinges ship with short screws that bite only into the jamb — a thin piece of trim lumber, not structure. Over years of use, the weight of the door works those screws loose and the top hinge pulls away from the jamb by a few millimetres. That tiny movement at the hinge becomes a centimetre or more of drop at the far bottom corner, because the door is a lever.

This is the cheapest problem on the list and the most common. Replacing the two centre screws in the top hinge with 3-inch screws that reach the stud behind the jamb often lifts the door back into place on the spot.

2. Seasonal swelling

Wood and engineered slabs absorb moisture. In a humid Toronto July a solid wood door can gain enough width to bind against the latch jamb, then release again in January. If the door drags only in summer and behaves all winter, you are looking at moisture, not hardware — and planing the door down in August guarantees a drafty, rattling door by February.

3. Frame movement

Houses settle. Basement underpinning, a new load above the opening, foundation movement, or simple age can rack the frame out of square. You can spot this by checking whether the frame’s own corners are square and whether the head jamb is level. When the frame is out, adjusting the door alone will never hold — the opening has to be reset. That is door frame repair territory, and it is worth doing properly because everything else hangs off the frame.

4. A warped or delaminated slab

Exterior doors take sun on one face and conditioned air on the other. Over time the slab can bow. Lay a straightedge diagonally across the door face — if you can slide a finger under the middle, the slab is cupped and no amount of hinge work will make it close cleanly.

What you can safely try yourself

• Tighten every hinge screw, starting with the top hinge. If a screw spins without biting, the hole is stripped — a longer screw or a glued hardwood dowel in the hole will fix it.
• Check the threshold. Many exterior thresholds have adjustment screws under the cap that raise or lower the sill. If the door only catches at the sill, backing those off a quarter-turn at a time may be the whole repair.
• Clean the sweep. Grit packed into a door sweep or weatherstrip drags and mimics a fitment problem.

What to avoid: planing the slab, shimming the hinges with folded cardboard, or removing the strike plate to “make it reach.” Each of those hides the movement instead of correcting it, and each makes the eventual real repair more expensive.

When it stops being a maintenance job

Call for a proper assessment when any of the following show up:

• The deadbolt no longer throws fully into the strike, even when you lift the door.
• You can see daylight at one corner of a closed exterior door.
• The drag appeared suddenly rather than gradually — sudden movement usually means structural movement.
• The frame is visibly out of square, or the drywall above the opening has cracked diagonally.
• The door is fire-rated. Rated assemblies cannot be planed, drilled or shimmed without voiding the rating.

A technician doing this work properly will check the frame for square and plumb first, then hinges, then the slab — in that order. Reversing that order is why so many “fixed” doors start dragging again within a season. Most of these calls fall under standard residential door repair and are resolved in a single visit when the frame is still sound.

Why the fix matters beyond the annoyance

A dragging door is not just irritating. It means the door is no longer sealing evenly, which shows up on your heating bill and as condensation at the corners. It also means the latch and deadbolt are under side load every time you close the door, which wears the lock cylinder and, more importantly, means the bolt may not be fully engaged in the strike. A door that looks locked but only has half the bolt in the frame is a security problem, not a comfort one.

Frequently asked questions

Why does my door only drag in the summer?

Humidity. The slab and the jamb both absorb moisture and expand. If the fit is fine in winter, do not remove material — address the sealing and finish so the door absorbs less moisture, and check that the top hinge is tight so the seasonal swelling has somewhere to go.

Can I just move the strike plate instead?

You can, and it will let the door latch again. But it does not address why the door moved, and it puts the bolt at an angle in the strike. Treat it as a temporary measure for a few weeks, not a repair.

How do I know if it is the hinge or the frame?

Open the door about 30 degrees and lift the handle. If the door visibly rises and the drag disappears, the movement is in the hinges. If lifting does nothing, the frame or the slab is the issue.

Is a dragging exterior door an emergency?

Not usually — unless it will not latch or lock. A door that cannot be secured overnight is worth handling the same day, and most Toronto shops offering door repair in Toronto treat a non-securing entry door as a priority call.

Will a new door solve it permanently?

Only if the frame and opening are sound. Installing a new slab into a racked frame reproduces the same problem within a year or two. Any honest assessment starts with the opening.

The short version

Doors drag because something rotated, dropped, swelled or shifted. Check the reveal, tighten the top hinge with long screws, and note whether the problem is seasonal. If the frame is out of square or the door will not lock, stop adjusting and get the opening assessed — the frame is the part that everything else depends on, and it is the part that gets expensive when it is ignored.