Six signs cover most cases where replacement makes sense, and seeing two or more in the same room is usually the tipping point. Windows rarely fail all at once. They leak a little more air, collect a little more water, and get a little harder to live with. Here is what to check for, room by room.
1. You can feel weather next to a closed window
A working window should not let a draft into the room. If you feel air at the lock, the meeting rail, or the sill, the weatherstripping or the frame is no longer sealing. Over a long Washington heating season, that is money and comfort leaving through the same opening every day.
2. There is fog or haze between the panes
That cloud sits inside the insulated glass. You cannot wipe it off. The seal has failed, the gas is gone, and the window no longer insulates the way it was built to. See fogged windows.
3. The window sticks, will not stay open, or will not lock
Paint buildup, swelling, and a frame that is no longer square all show up as a window that is hard to operate. A tune-up is worth trying once. If the opening itself has moved, a new window with the opening corrected (see what each opening needs) is a better fix than another round of planing.
4. The sill is soft, stained, or peeling
Western Washington rain finds the weak corner of a window. Soft wood at the sill means water has been getting into the opening. Replacement is the chance to flash the opening correctly, not just put a new window into a wet opening.
5. One room never matches the rest of the house
Old single-pane and aluminum frames create cold glass. The furnace runs and the thermostat reads fine, but the chair by the window is still cold. That is a comfort problem first, and energy savings come along with it.
6. The bill went up and nothing else changed
Windows are a small part of the wall but a large share of heat loss. If the insulation and heating system are already in good shape, leaky windows are a common remaining cause. Replacement will not fix a leaky attic, but it will stop the drafts you can feel.
How urgent is each sign
Not every sign on this list needs action this season. A rough way to sort them:
- Act this year: soft or stained sills (water damage compounds), fog between panes on a window you use daily.
- Plan for it: drafts, sticky sashes, a bill that keeps climbing — real, but a slower-moving cost.
- Watch it: one uncomfortable room, if the rest of the house is otherwise fine — worth a measure, not necessarily a rush.
A soft sill left two more winters usually costs more to fix than the window itself would have.
What to do with this list
If two or more of these are true in the same room, a measure is worth the time. Bring a photo of the elevation and a rough count. We will tell you what each opening needs in the written estimate (how we look at it).
Common questions
Can I just recaulk a drafty window?
Fresh caulk helps a sound unit. If the sash rattles, the glass is fogged between panes, or the frame is soft, caulk is a delay, not a repair.
Do all old windows need to come out at once?
No. Many homeowners start with the worst rooms — bedrooms, the windward wall, or the fogged units — then finish the house when it fits the budget.
Is condensation on the room side a failed window?
Not always. Moisture on the room side of the glass is often indoor humidity hitting cold glass. Fog between the panes is a failed sealed unit.