Key takeaways
- Fog between the panes means a failed seal. It can’t be reliably fixed, only replaced.
- Drafts, sweating frames and sticking sashes usually point to old aluminum or worn early vinyl.
- Broken glass, worn weatherstripping or a broken lock can often be repaired instead.
- If you see three or more of these signs, replacement usually pays off in comfort right away.
What are the signs you need new windows?
These are the nine most common signs that East Bay windows are ready to be replaced:
- Fog or haze between the panes of glass
- Drafts or cold spots near the windows
- Condensation or water on the frames
- Windows that stick, won’t lock or won’t stay open
- Rot, soft sills or peeling frames
- Single-pane glass or original aluminum frames
- Street noise you can’t get away from
- Faded floors, rugs and furniture
- Rooms that stay hot all summer
One sign on one window is usually a repair question. Several signs across the house usually means the windows have reached the end of their life.
1. Why is there fog between my window panes?
Dual-pane windows are sealed units with insulating gas between the two panes. When the seal fails, moist air gets in and the glass looks cloudy or streaky from the inside, and wiping it does nothing. The insulating gas is gone too, so that window no longer insulates the way it should.
A failed seal can’t be reliably repaired. Some companies drill and “defog” units, but the seal is still broken. The lasting fix is a new insulated glass unit or a new window. In neighborhoods built in the 1990s and 2000s, like Dougherty Valley and much of Brentwood, builder windows of the same age tend to fog around the same time.
2. Do drafts mean I need new windows?
Not always. Hold your hand or a candle near the edges of a closed window on a windy day. If air moves around the sash, the weatherstripping may just be worn, which is a repair. If air comes through the frame, around the outside of the window, or the sashes rattle in their tracks, the window itself is worn out or was never sealed well.
3. Why do my window frames sweat in winter?
Original aluminum frames conduct cold straight into the room, so on winter mornings warm indoor air condenses on them and drips onto the sills. That moisture leads to mildew and rot over time. Modern vinyl, fiberglass and thermally improved aluminum frames stay much warmer on the inside surface, which is what stops the sweating.
4. What if my windows stick or won’t lock?
Sliders that drag, sashes that won’t stay up and locks that no longer line up are classic signs of worn rollers, warped frames or settling. A single bad roller or balance can sometimes be replaced. When it’s every window, or the frame itself is bent, replacement is the better answer, especially for bedroom windows that need to open easily in an emergency.
5. Is rot around a window a problem?
Yes. Soft sills, crumbling paint and dark stains on wood windows mean water has been getting in. Left alone, rot spreads into the wall framing. It’s common in older Oakland, Berkeley and Martinez homes. When we find it, we deal with the rotted wood first, then install the new window properly sealed and flashed.
6. Should I replace single-pane or old aluminum windows?
If your home still has single-pane glass or the original aluminum frames from the 1950s to 70s, which describes thousands of homes in Concord, Pleasant Hill and Walnut Creek, replacement is almost always worth it. The difference in comfort, noise and condensation is immediate. Most of these can be replaced as a retrofit, without touching the stucco.
7. Can new windows reduce street noise?
Noticeably. Old windows leak sound around the frame and through thin glass. New dual-pane windows help, and laminated glass or panes of different thickness help much more. Homes along I-680, Highway 24, Highway 4 and the BART lines see the biggest difference, usually starting with the bedrooms.
8. Why are my floors and furniture fading?
Ultraviolet light through older glass fades hardwood, rugs and fabrics. Modern Low-E glass blocks most UV. Several brands we install list UV blocking in the mid to high 90 percent range for their better glass packages.
9. Why do some rooms stay hot all summer?
West- and south-facing rooms in inland cities take hours of direct afternoon sun. Clear old glass lets most of that heat straight in. New glass designed for hot climates rejects much of it while keeping the room bright. See our guide to the best windows for hot East Bay summers.
Repair or replace: how do you decide?
| What you see | Usually means | Typical fix |
|---|---|---|
| Fog between panes | Failed seal | Replace the glass unit or window |
| Draft at the sash edge only | Worn weatherstripping | Often a repair |
| Cracked or broken glass | Impact damage | Often a glass repair |
| Sweating aluminum frames | Frames conduct cold | Replace |
| Sticking on every window | Worn or warped frames | Replace |
| Soft, rotted sills | Water getting in | Repair the rot, replace the window |
We’re a replacement company, so we don’t do glass-only repairs or hardware fixes. If a repair is all you need, we’ll tell you, and suggest you call a glass repair shop.
How long do windows last?
It depends on the material and the sun they face. Original single-pane aluminum is well past its useful life in most homes. Early builder-grade vinyl often starts showing failed seals and warped frames after 15 to 25 years in our inland heat. Quality modern vinyl, fiberglass and clad wood windows, installed properly, are built to last for decades.
What should you do next?
Walk through the house and note which windows show which signs, and which way each one faces. Then get an in-home or remote estimate. We’ll check every opening, tell you honestly which windows need replacing now and which can wait, and put it all in a written quote.
Want a straight answer for your home? We’ll look at your windows and tell you what they need, even if that’s nothing yet.
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