Most modern windows last roughly 20 to 30 years, though the honest answer is that a window’s components age at different rates: sealed glass units often fail before frames do, hardware wears with use, and weatherstripping gives out fastest of all. That is good news for homeowners, because many “old window” problems are actually component problems, fixable for far less than replacement. The skill is knowing which signs point to a quick repair and which mean the window has genuinely reached the end of the road.
Centennial Glass has been repairing and replacing windows in Ottawa since 1967, so we have watched several generations of windows age. Here is how lifespan really works, and the seven signs to watch for.
What Determines a Window’s Lifespan?
- Materials. Vinyl and aluminum frames resist weather for decades; wood lasts well only with diligent maintenance.
- The sealed unit. The insulated glass unit has its own service life: the edge seal is usually the first thing to fail, which is why our FAQ on the lifespan of thermopane windows treats glass separately from the window around it.
- Installation quality. A poorly flashed or badly shimmed window ages fast no matter how good the product is.
- Exposure. South- and west-facing windows take more sun and thermal cycling; windward walls take more rain.
- Use. A bedroom window opened daily wears hardware far faster than a fixed picture window.
7 Signs It’s Time to Replace (or Repair) Your Windows
1. Fog or condensation between the panes
Moisture trapped inside the glass means the sealed unit’s edge seal has failed. Usually a repair: the sealed unit can be replaced inside a sound frame, as covered in our guide to getting rid of foggy windows. If most units in the house are fogging at once, the windows may be aging out together, and replacement quotes are worth gathering.
2. Drafts you can feel
Cold air at the sash usually means worn weatherstripping, a quick fix covered in our guide to preventing window air leaks during Ottawa winters. Cold air from *around the frame*, where the window meets the wall, points to installation or frame failure, a replacement-level problem.
3. Hard to open, close, or lock
Stiff cranks, seized rollers, and misaligned locks are hardware problems. Usually a repair: Centennial’s parts counter stocks window and door hardware for most major brands. But if the sash binds because the frame itself has warped or the house has shifted, replacement is the durable fix.
4. Rot, warping, or damage in the frame
Soft wood, swollen sashes, separating corners, or frames pulling away from the wall cannot be solved with new glass or parts. This is the clearest replacement sign: deteriorated frames compromise everything attached to them, and modern frames will outperform a patched-up original.
5. Rising heating bills and cold rooms
Windows are a major heat-loss path. If rooms near windows feel noticeably colder and bills keep climbing, the glass, the seals, or both are underperforming. Depending on frame condition, the answer is either upgraded sealed units or full replacement with a modern energy package.
6. Outside noise getting louder
Aging seals and single-pane or failed glass let in more sound. New sealed units, especially laminated acoustic glass, often solve it without new windows.
7. Condensation, staining, or peeling paint around the window
Moisture damage on walls or sills around a window suggests water is getting past the unit, a flashing or frame issue that typically calls for replacement and proper professional installation.
Repair First, Replace When It Counts
Signs 1, 2, 3, and 6 are usually component repairs; signs 4, 5, and 7 lean toward replacement. Because Centennial Glass does both, with in-house glass fabrication and same-day service available for many repairs, you get a recommendation based on the window, not the price tag. Roughly half our work is residential and half commercial, and the approach is identical for one window or forty. That is the experience customers report on both sides of the decision:
“One of our casement window cranks broke after years of use. I learned by experience that if you need a replacement part for your window, Centennial Glass is the place to go. Not only will they likely have what you need in stock, they also provide great service. Ask for Ron, you will find him very helpful in making sure you get the right part.” — Steve Taylor, 5★
“Very happy with Kyle and Stephane who installed our new windows yesterday! Punctual, professional and friendly. From the moment they removed their shoes at the entrance, we knew they would be exceptional. Installed twelve windows in 2 1/2 hrs! Quick and efficient! Would highly recommend Centennial Glass, if you want professionals and excellence.” — Summer Bumpkin, 5★
FAQ: Window Lifespan
How long do vinyl windows last?
Vinyl frames commonly serve 20 to 30 years or more. The sealed glass units and moving hardware inside them often need attention sooner, which is normal and repairable.
Do foggy windows mean the whole window is worn out?
No. Fogging means the sealed unit failed, and it can be replaced inside a healthy frame. It becomes a replacement signal mainly when many units fail together in older windows.
Can old windows be made energy efficient without replacing them?
Often, meaningfully so: new sealed units with modern Low-E glass, fresh weatherstripping, and adjusted hardware recover much of the lost performance, provided the frames are sound.
When should I stop repairing and just replace?
When the frame is rotted or warped, when water is getting into the wall, or when several components are failing at once on windows already decades old. At that point repairs only buy short extensions on a window that is finished. A professional window repair assessment will tell you which side of the line you are on.
Not Sure Which Sign You’re Looking At?
Whether your windows need a fifteen-minute hardware fix or a full replacement plan, Centennial Glass brings 55+ years of Ottawa experience to the question: no project too large or too small. Call us at 613-738-9500 or contact Centennial Glass to book an assessment.