Repair or replace
Fixing a window properly: new glass, a new part or a new window
If the frame is solid, most window problems are fixed at the glass or the hardware: a new sealed unit for fog, reglazing for a crack, a new crank or balance for a sash that won't behave. Replace the whole window when the frame is rotten, warped or badly installed, or when a bedroom needs a proper way out. The provincial rebate only counts complete ENERGY STAR windows, so it can tip a borderline case. It shouldn't talk you out of a good repair.
Is the frame still sound? Check that first
Nearly every repair-or-replace question comes down to the frame. Glass, weatherstripping, cranks and balances can all be swapped; the frame is what they hang on. If it's solid, square and dry, the window can usually be put right piece by piece. If not, new parts go onto a failing base.
Four checks you can do yourself:
- Poke the low corners. Press a pointed tool into the lowest corners of sill and sash. Soft or crumbling wood is rot.
- Work every sash. A sash that sticks in one spot may need adjusting. One that binds everywhere can mean the frame has moved.
- Feel around the outside of the frame, not just the sash. Air or water getting in between frame and wall points to the installation.
- Look at the corners. Cracked vinyl welds or bent aluminium tracks are frame problems.
Oshawa has Durham's oldest housing, so original wood windows often sit next to replacements from several decades. Each window gets its own answer.
Glass-level fixes: sealed units, reglazing and storms
Fog between the panes means the seal on the sealed unit has failed (the older word is thermopane). The glass unit gets replaced on its own, built to the old one's size, while the frame, trim and hardware stay put. Some pros also offer defogging. Foggy window repair sets out both evenly.
A cracked or broken pane is a reglazing job: a new sealed unit on a double-pane window, or a new pane in fresh glazing compound on older single glass. Broken window glass covers making the opening safe while the new glass is made.
Storm windows on older houses count too. A cracked storm pane is a small job on its own, and the City's property standards expect storms kept in good repair like the window behind them.
Part-level fixes: cranks, balances, weatherstripping and sills
Plenty of windows that feel finished have one worn part.
- Casement won't close tight. The operator (the crank mechanism) or hinges are usually worn, and are replaced on their own.
- Double-hung sash drops or won't stay up. The balances in the side channels are worn; they're replaced sash by sash.
- Drafts at the sash. Tired weatherstripping, a modest job to renew.
- Shallow sill rot. Cut out, patched and painted.
- Cracked or missing caulking between the frame and the wall. Winters here cross freezing often, which is hard on caulking and on sealed-unit edge seals.
Window repair covers the hardware side. Patio doors work the same way: a slider grinding along its track is usually a roller job, not a new door. See sliding door repair.
When full replacement wins: rot, warped frames, failed installs, egress
Sometimes the honest answer is a new window:
- Rot through the frame, not just a corner of the sill.
- A warped or out-of-square frame that makes the sash bind however it's adjusted.
- A failed installation. Water getting in around the window or missing flashing. New glass won't fix that.
- Everything going at once. Fogged units, worn hardware and a tired frame on one old window.
- A bedroom you can't get out of. Oshawa's property standards require a window you can escape through on every floor with a bedroom, unless a door there leads outside. See basement and egress windows.
An insert fits a new window inside the existing frame and suits a sound frame. A full-frame replacement goes down to the rough opening, for when the frame is the problem or the opening must change. Replacement windows covers both.
Oshawa's permit exemption for same-size, same-type replacement is for houses only. A new or larger opening needs a permit; for apartments, condos and storefronts, check with the City first. Elsewhere in Durham, each town issues its own permits.
Older Oshawa homes and wood windows: restoration or replacement
Where an older Oshawa house still has its original painted wood windows, often behind storms, those windows were built to come apart. A sash can be taken out, reglazed, re-balanced, weatherstripped and painted. When the wood is sound, that restoration keeps the window the house was built with. If several sashes are soft through, a new window may be the better use of money. Ask the pro to price both.
Rentals: the standard is good repair, not new windows
Landlords sometimes assume the City wants new windows. The Property Standards By-law asks that windows keep the weather out and stay in good repair: cracked glass reglazed, hardware and weatherstripping sound, screens on windows that open. It's about condition, not age. The property standards guide goes clause by clause.
Heritage-designated properties: what needs Council approval
Oshawa has a small number of designated heritage properties and one heritage conservation district, at the airport's South Field. On a designated property, alterations that affect heritage attributes need Council approval, with Heritage Oshawa consulted; heritage permits carry no fee. Minor alterations and regular maintenance don't need approval.
Reglazing a pane or renewing weatherstripping sits on the maintenance side. Swapping original sash for a different design can touch heritage attributes, so ask the City's heritage staff before ordering.
Ontario has given municipalities until 1 January 2027 to designate or remove properties only listed on their registers, so check a listed home's status first. Designated properties also qualify for a heritage tax reduction.
Rebates: only whole windows count
Ontario's Home Renovation Savings Program, run by Enbridge Gas and Save on Energy, rebates each rough opening that receives a complete ENERGY STAR certified window or door, usually as part of an assessed retrofit with more than one upgrade. A glass swap in an old frame isn't a certified window, so repairs don't earn it.
There's no general federal window grant; the old federal grant is closed. Durham Greener Homes offers a free assessment and a loan, but names insulation, air sealing and heat pumps, not windows. So: if a window is genuinely due, the rebate is a fair factor. If only the glass has failed, it isn't a reason to replace a good window.
Prices aren't listed on this site. Each sealed unit and window is built to order, which is why the quote rests on these:
| Factor | Why it matters |
|---|---|
| Size and shape | Large, arched or odd-shaped glass costs more to make and handle |
| Glass type | Double or triple, low-E coatings, tempered glass where required |
| Access | Upper floors, bay windows and glass behind storms take longer |
| Frame condition | Rot or warping turns a glass job into a bigger one |
| Scope | Glass only, sash and hardware, insert or full-frame, trim inside and out |
| Removal | Whether taking away the old glass and frame is included |
A decision checklist to take to your quote
- Photos of each problem window inside and outside, plus close-ups of the fog, crack, rot or broken part.
- What the frame checks above turned up.
- Which rooms are bedrooms, including any in the basement.
- Whether it's a house, rental, apartment, condo, storefront or designated property. Each changes the permit questions.
- A request for two written prices: repair and replacement, scope spelled out.
- How the opening will be covered while a made-to-order sealed unit is made.
Send the photos with your quote request. We hand it to an independent pro in Durham who handles that kind of window, then check back so it doesn't sit unanswered.
Frequently asked questions
My sealed unit is foggy. Is that a repair or a replacement?
Usually a bit of both: the window stays and the sealed unit inside it is replaced, keeping the frame, trim and hardware. Defogging is the other route: the unit is cleaned and dried through small holes, which clears the view. Neither needs a new window if the frame is sound. Foggy window repair compares them.
Are the original wood windows in an older Oshawa house worth keeping?
Often, if the wood is sound. Old sash was built to be reglazed, re-balanced and painted, and a good storm helps with drafts. It stops being worth it when rot runs through the frame or several sashes are soft. Ask for restoration and replacement prices side by side. Window repair covers the part-level work.
When is a sliding patio door past repairing?
When the frame is the problem: rot at the sill, a warped frame, or water getting in around the door. A door that drags, won't lock or comes off the track usually needs rollers, a lock or track work, and a fogged door panel is replaceable by itself. Sliding door repair covers the usual faults.
Can I repair the original windows on a designated Oshawa house without Council approval?
Yes. Regular maintenance and minor alterations on a designated property don't need Council approval. Changes that affect its heritage attributes, such as swapping original sash for a different design, do; heritage permits carry no fee. Not sure if your house is designated? Start with the City's heritage alterations page and ask before ordering new sash.
Which usually costs less here, fixing the window or replacing it?
Fixing the part that failed usually costs less, because the frame, trim and interior finish stay put. That changes when the frame is rotten or several things are failing at once. Size, glass type, access and scope drive the price either way. Ask for both options in writing through a quote request.
Will a rebate help pay for new glass in my old frames?
No. Ontario's Home Renovation Savings Program counts rough openings that get a whole ENERGY STAR certified window or door, usually alongside a home energy assessment. Glass fitted into an existing frame isn't a certified window, and there's no general federal grant. If the rest of the window is sound, new glass is still often the sensible fix.
