Sliding doors · Mississauga
A sliding door should glide. Here is what usually stops it
A sliding door that drags, jumps its track or won't lock rarely needs replacing. Most faults sit in the rollers, the track or the latch. First, what kind of building is it? A balcony door in a tower suite may be the condo corporation's to fix. A backyard slider is yours. We connect you with an independent local pro who repairs sliding doors and can tell you which part has worn.
- Rollers, tracks and locks
- Balcony doors and backyard sliders
- A straight answer on repair or replace
What you notice
Symptoms and what they point to
Watch the bottom edge as the door moves.
Drags or grinds
Usually flat or seized rollers, or grit in the track: leaves and dust on a balcony, sand and pet hair at a deck door.
Jumps the track or rocks
A roller has broken or the track is dented. Stop forcing it; a panel that leaves its track can tip.
Won't lock or latch
The panel has sagged, so the latch misses the keeper on the frame, or the lock has worn.
Won't stay closed
The panel rides high at one end and springs back, or the keeper has shifted. Levelling comes before a new lock.
The usual fix
Rollers and tracks: the usual fix
A sliding panel rides on two roller assemblies in its bottom edge, with a screw at each end to raise or lower it. With use, the wheels flatten or crack and the bearings seize. The panel drops, drags and pulls away from the latch.
The repair: lift the panel out, fit matching rollers, set the height, and clean or straighten the track. The glass and frame stay. On an original door in a 1970s or 1980s house, the rollers have carried a heavy panel a long way.
Condo suites
Balcony doors in condo buildings: check who owns the door first
More than a quarter of Mississauga households live in buildings of five storeys or more. Three steps save a wasted visit.
Ask the management office
The declaration says whether the door is the corporation's or part of your unit. If it's common, the corporation usually arranges the repair. See our condo owners page.
Get the building's details
If you may hire your own pro, ask about elevator booking, parking and any insurance certificate.
Leave the panel to the pro
Don't lift a balcony panel out yourself. It is heavy glass, and at height a slip can send it toward the railing.
Locks and handles
Locks, handles and secondary security bars
A door that won't lock has often dropped. Rollers first, then hardware.
Latch, handle and lock
When the panel sags, its hook misses the keeper; raising the panel often fixes it. A handle that spins or a worn lock is replaced on its own.
Security bar
A second stop for a ground-floor or walk-out door, fitted without changing the door.
Past repair
When the door is past repair
A frame that is rotted, split or bent out of square won't hold new rollers true. Haze between the panes means the sealed unit has failed, a separate glass job; see foggy sealed units. When frame, glass and rollers are all tired at once, a new door is usually the better use of money.
The pro will say which it is. Patio door replacement covers styles, permits and safety glass, and the doors and screens page lists the other jobs.
What affects the quote
What sets the price of a sliding door repair
Rollers differ from door to door, so expect questions about:
- Whether matching rollers are still made
- The track: clean, dented or needing a cap
- Panel size and weight
- Access: a suite floor, an elevator or a raised deck
A short video of the door moving, plus a photo of the bottom corner, lets a pro judge the job first.
After heavy rain
Water at the sill after heavy rain
Two record-setting rainstorms in summer 2024 left many Mississauga households dealing with water, and a sliding door is one place it shows up. The sill has small drain holes, called weep holes, that let rain out of the track. Blocked with grit, they let water back up and spill inside.
Clear the track and weep holes first. If water still gets in, the pro checks the sill seal and caulking. Resealing can stop a leak at the door, not water coming from a foundation or a flooded patio.
Common questions
Sliding door questions
Explore your options
Other door and screen jobs
Local pros repair sliding and balcony doors across the city, including Mississauga City Centre, Erin Mills, Meadowvale, Lakeview and Cooksville.
Send a short video of the door opening and closing
Say whether it's a balcony or backyard door. We pass it to a local pro who repairs sliders. If the rollers are the only worn part, that's what they'll quote.