There is never a good time for a door to stop working. One evening it swings shut the way it always has, and the next morning it drags across the floor, refuses to latch, or leaves you jiggling the key while the deadbolt won’t turn. In a city like Toronto, where a single week can move from humid heat to a sudden cold snap, doors take a real beating — and a small alignment problem can quickly become a security problem.

This guide covers why exterior and interior doors suddenly stop closing or locking, what you can safely handle yourself, and when it makes more sense to bring in a professional.

Why a door suddenly won’t close or lock

Most sudden door problems come down to a few common causes. Knowing which one you are dealing with saves time and tells you whether it is a five-minute fix or something bigger.

The door has dropped on its hinges

Over time, the weight of a door slowly pulls the top hinge away from the frame. The screws loosen, the door sags toward the latch side, and the latch no longer meets the strike plate. If your door catches on the frame near the top corner or the latch sits low, a dropped hinge is usually the culprit.

The strike plate and latch no longer line up

The strike plate is the small metal plate on the frame that the latch clicks into. If the door has shifted even a couple of millimetres, the latch hits the plate instead of sliding into it, and the door won’t stay shut. You can often see fresh scrape marks on the plate where the latch has been rubbing.

Humidity has caused the door to swell

Toronto summers are humid, and wood doors absorb moisture from the air. The door expands, tightens against the frame, and starts to stick — usually along the top or the latch edge. This is why a door that worked perfectly in winter can bind in July. A door that swells badly every year may need to be planed or sealed.

The lock or latch mechanism is failing

If the door closes fine but the key turns roughly, the handle feels loose, or the deadbolt sticks halfway, the problem is inside the lock itself. Worn internal parts, a bent latch, or dirt in the cylinder all cause a lock to bind. A failing lock on an exterior door should be dealt with quickly, because it can leave you locked out or unable to secure the house. If it comes to that, a fast lock change in Toronto restores security the same day.

Simple fixes you can try before calling anyone

Before assuming the worst, a few basic checks solve a surprising number of door problems.

Tighten the hinge screws

Open the door, support its weight, and tighten every screw in the hinges — especially the top hinge. If a screw just spins and won’t bite, the hole is stripped. Replacing that screw with a longer one that reaches the frame stud will pull the door back into alignment and often fixes sagging on its own.

Realign the strike plate

If the latch is hitting just above or below the strike plate opening, you can file the opening slightly larger or move the plate a few millimetres. Mark where the latch actually lands, unscrew the plate, adjust, and screw it back in. This is one of the most common and satisfying quick fixes.

Clean and lubricate the lock

A sticky lock is often just dirty. Spray a dry graphite or silicone lubricant — not oil, which attracts grit — into the keyway and work the key in and out a few times. For handles and deadbolts, a little lubricant on the latch bolt keeps everything moving smoothly.

When it’s time to call a professional

Some problems go beyond a screwdriver and a can of lubricant. If the door frame itself is cracked or rotted, the door was forced during a break-in, weatherstripping has failed, or you are dealing with a commercial door that has a closer and panic hardware, it is worth bringing in an expert. A qualified door repair company in Toronto can realign frames, rebuild worn strike areas, replace locks and hinges, and get a security door working again the same day — usually for far less than the cost of a full replacement.

Professional repair is also the safer choice after a break-in. A door that has been kicked or pried often looks fine but no longer seals or locks the way it should, and only a proper frame and hardware repair restores real security.

Preventing door problems before they start

A little seasonal maintenance keeps most doors trouble-free. Twice a year, tighten the hinge screws, check that the latch still lines up cleanly with the strike plate, and lubricate the lock. Inspect the weatherstripping so it stays flexible, and keep the bottom of exterior doors sealed against moisture. Catching a loose hinge early is far cheaper than repairing a frame that has been straining against a dragging door for months.

Frequently asked questions

Why does my door only stick in the summer?

Humidity. Wood doors absorb moisture from warm, damp air and expand, which makes them bind against the frame. As the air dries out in fall, the door usually shrinks back and moves freely again.

Is it cheaper to repair or replace a door?

In the large majority of cases, repair is far cheaper. Realigning a door, rebuilding a strike area, or replacing a lock or hinge costs a fraction of a full door-and-frame replacement, and a good repair can add years of service to a door you already have.

Can a professional fix a door that won’t latch at all?

Yes. A door that won’t latch is almost always an alignment or hardware issue — a dropped hinge, a shifted strike plate, or a worn latch — all of which a professional can correct quickly, often in a single visit.

A door that won’t close or lock is more than an annoyance — it is a gap in your home’s security and comfort. Many issues are simple to fix yourself, but when the frame, the security, or a commercial door is involved, a same-day professional repair is the fastest way to get everything working and safe again.