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Fix the hardware and keep the window
Window crank replacement and lock repair are among the most common calls we get, and most of them do not need a new window. GTS Windows & Doors has been repairing window hardware in Kitchener-Waterloo since 1986, from stripped casement operators to sash locks that no longer catch. We serve homeowners, landlords, property managers and builders across Waterloo Region, Guelph and the surrounding townships.
Hardware wears out long before a good frame does. A casement operator is a small gearbox that turns thousands of times over its life, and the gears and splines inside eventually strip, while locks drift out of line as houses settle and sashes sag. Replacing a worn part is usually a small fraction of what the window around it would cost to replace, and the frame, glass and seals you already paid for keep doing their job for years longer.
The hard part is identifying the right replacement among hundreds of similar-looking operators, locks and latches. We measure, photograph and match the hardware, source parts for current and discontinued windows, and install them so the window closes tight again. It is one of the most cost-effective services in our window repair line-up, and our crews are licensed, insured and WSIB covered.
When a lock handle turns but does not pull the sash tight, the lock and its keeper are usually out of line. Common causes are a sash that has sagged on worn hinges, a frame that has shifted with the house, or a keeper worn smooth.
We realign or shim the keeper, adjust the sash and replace worn keepers so the lock draws the sash firmly against its seals.
On single hung, double hung and slider windows, the cam-style sash lock at the meeting rail holds the sashes together and pulls them tight. Tilt latches at the top of a hung sash let it tip inward for cleaning, and a broken latch can leave the sash loose or stuck.
Both are usually replaced as matched parts that fit the existing screw holes.
Casement and awning windows open with a crank operator, and when its gears strip the handle spins without moving the sash. Sometimes only the handle's splined socket is worn, which is a quick fix, but a grinding or slipping operator needs full replacement.
We also check the hinges and the arm's track or stud, since a stiff hinge is often what wore the operator out in the first place.
A lock can only pull a sash as tight as its seals allow. If the lock engages properly but the window is still drafty, the seal has usually flattened, which our window weatherstripping service fixes with a matched profile.
A frame that has bowed can also stop a lock lining up no matter how the keeper is adjusted. In that case the frame itself needs attention before new hardware will help.
Casement operators alone come in many variations: left or right hand, single or dual arm, different arm lengths, and different mounting patterns and heights. Fitting the wrong one either misses the screw holes or pulls the sash out of square.
How we identify the hardware:
Much of the hardware in North American windows comes from a relatively small number of makers, such as Truth (Amesbury Truth), Roto and Ashland, which makes matching possible even when the window company itself has closed. We source through window hardware suppliers and choose the closest direct replacement, or a retrofit part with an adapter plate when the original is no longer made.
For worn rollers, bent tracks and other slider-specific parts, see our sliding window repair service. If you are not sure what style of window you have, our window styles guide shows the differences between casement, awning, hung and slider windows.
Basement and ground-floor windows are the easiest to force. Most factory locks are designed to hold a sash closed against weather, not to resist prying, so a few inexpensive additions make a real difference.
Never lock or block a window that serves as a bedroom's emergency exit in a way that needs a key or tools to open from inside. We check which windows are egress windows before recommending any added lock or stop.
Where a basement bedroom window needs both security and a clear escape route, we use hardware that stays locked from outside but releases by hand from inside.
Falls from windows are a real risk for young children, and insect screens are not built to hold a child's weight. Window opening control devices, often called WOCDs, limit how far a sash opens while still letting an adult release it for full opening in an emergency.
For new construction, the Ontario Building Code requires openable windows in homes to be protected by a guard or by a mechanism that limits the opening so a 100 mm sphere cannot pass through. This generally applies where the sill is 480 mm or less above the floor and the floor is 1.8 m or more above the ground outside, with some exceptions, so confirm current requirements with your building department.
Existing homes are not required to add them, but retrofitting is simple. We fit strap-style and hinge-mounted opening limiters to casements, awnings and sliders, choosing devices an adult can release without tools so the window still works as an emergency exit.
These are typical 2026 ranges for Waterloo Region, including the part and installation, with a minimum charge for a single small repair. Doing several windows in one visit lowers the cost per window, while discontinued hardware that needs an adapter plate or custom fitting raises it.
Our installations carry a 20-year parts and labour warranty, and your repair quote states what coverage applies to the replacement hardware.
| Repair | Typical price (2026) | What moves the price |
|---|---|---|
| Casement or awning crank operator | $120 to $250 per window | Operator type, handing, availability |
| Crank handle only | $40 to $90 | Spline size, finish |
| Sash lock and keeper | $80 to $180 per window | Lock style, finish |
| Tilt latch pair on a hung sash | $90 to $180 per sash | Latch style, sash condition |
| Window opening control device | $60 to $150 per window | Device type, window style |
| Secondary or keyed lock retrofit | $60 to $150 per window | Lock type, frame material |
On most windows, yes, as long as a matching or adaptable operator is still available. Casement and awning operators from the major hardware makers are widely stocked by suppliers, and discontinued ones can often be swapped for a retrofit operator. Very old or uncommon European hardware can take longer to source.
Usually because the sash or frame has moved. Casement sashes sag as hinges wear, hung sashes drop when their balances weaken, and houses settle, so the lock ends up above or below its keeper. Realigning the keeper or adjusting the sash usually fixes it, while a bowed vinyl frame needs the work described on our vinyl window frame repair page.
Yes. Secondary sash locks, keyed slider locks, anti-lift blocks and vent stops can be added to most older wood, aluminum and vinyl windows. We choose hardware that suits the frame material and never compromises a bedroom egress window.
Yes. Mortise locks, handle sets and keepers on sliding patio doors can be repaired or replaced in the same visit as your window hardware. Our sliding glass door repair service covers door rollers, tracks and locks in detail.
Take a clear photo of the operator, lock or latch, plus any label on the window, and email it to info@gtswindows.ca or mention it in your quote request. Photos help us identify the part in advance, so we can often bring the right hardware on the first visit.
Call or text226-806-0597