You should replace your windows when a closed unit lets in a draft, fog sits between the panes, the sash will not open or lock, or the frame is soft, cracked, or out of square. Weatherstripping, hardware, and indoor humidity can still fix some of those complaints. The deciding factor is whether the failed part is a piece you can service, or the sealed unit and the frame around it.
Weather Pro replaces vinyl windows on existing homes with its own crews, after a free in-home measurement. If the frame is sound, square, and dry, it can stay, and the new unit goes into it. A rotten, shifted, or undersized opening means we remove the old frame. The published glass package is double pane with a low-E coating and argon, or triple pane where that elevation needs it. You choose those products after you know which opening has actually failed.
This guide walks the signs in the order a homeowner usually meets them. It separates repair from replacement, and it lists what a quote should include before you compare prices. It doesn’t pick double pane versus triple pane for a whole house, and it doesn’t turn age into a deadline. Condition decides.
Key Takeaways
- A draft on a closed window, fog between the panes, a sash that will not operate, and a soft or cracked frame are the signs that point to replacement.
- Water you can wipe off the room side of the glass is often humidity on a cold surface. Fog you cannot wipe off is a broken seal.
- A stuck crank, a loose lock, or a torn screen can be a repair when the frame is still square and dry.
- Full frame window replacement is the path when the frame is rotten, the opening has shifted, or the size has to change.
- Age by itself is a weak sign. The seal, the sash, and the frame tell you more than the year on the spacer.
- The quote should name the failed part, whether the frame stays, and that the price is for installation.
Signs you should replace your windows
A vinyl window is doing its job when it closes, locks, keeps wind out, and stays clear. Replacement starts when one of those jobs has stopped, and a service part will not bring it back. Feel the perimeter on a cold or windy day. Wipe the glass. Open and lock every sash you care about. Press the sill. Those four checks sort most houses before anyone talks about a style.
Use the grid as a first sort. The sections after it show how to run each check, so a humidity problem isn’t priced as a new window and a rotten sill isn’t priced as a tube of caulk.
| What you notice | What it usually means | First move |
|---|---|---|
| Draft at the closed sash | Weatherstripping or a sash that does not meet the frame | Service the seal, then test again |
| Draft at the trim or drywall | A gap between the frame and the wall | Air-seal that joint, then check the frame |
| Fog you cannot wipe off | The seal of the insulating glass unit has failed | Replace that unit, or the window if the frame is bad |
| Water you can wipe off | Moist indoor air on cold glass | Humidity and airflow first |
| Sash will not open or lock | Hardware, or a frame that has racked | Hardware if the frame is square; replacement if it is not |
| Soft sill, rot, or a cracked frame | The opening itself has failed | Full frame replacement |
Two openings in the same room can land on different rows. Replace the one that has failed. Leave the one that only needs a sweep or a crank. A whole-house price based on the damaged windows alone will overstate the job, and a price based only on the clear windows will miss the sill that is already soft.
Walk the house once, in this order, and write a line for each opening.
- Note the room, the wall, and whether the sash operates or is fixed.
- On a cold or windy day, feel the sash, then the trim, and mark where air moves.
- Wipe the room side of the glass. If the haze stays, the moisture is between the panes.
- Open, close, and lock the sash. Mark any crank, lock, or meeting rail that will not seat.
- Press the sill and the lower corners. Soft material or a gap at the drywall changes the job from glass to frame.
Drafts you can feel on a closed sash
A draft is moving air you feel with the sash closed and locked. Air at the sash is a different repair from air at the trim. Caulk over both; without that, the split hides the opening that still needs a new unit.
Air at the weatherstripping
Feel along the meeting rail, the lock side, and the sill where the sash lands. A small cold line there often means the weatherstripping is crushed, torn, or painted on, or the sash is not pulling in all the way. This group includes a casement that needs a shoulder to close, or a slider that has to be lifted to lock. Hardware and a new sweep can restore the seal when the frame is still square, and the glass is clear.
Test again after that service, on another windy day. If the draft at the sash is gone, you do not have a replacement sign. If the draft moved to the trim, or the sash still will not meet the frame without force, the opening has racked and the conversation changes.
Air at the trim and the wall
Move your hand from the sash to the casing and the drywall line. Air is coming through the joint between the window and the wall, not through the glass. Interior caulk, backer rod, or low-expansion foam in that gap can stop it when the frame itself is solid. Ask which product goes in the gap. A high-expansion foam can bow a vinyl frame and create a new draft.
If the trim is stained, the drywall is soft, or you can see daylight at the jamb, sealing foam is a temporary cover. Water has already been past the joint. That opening belongs with the frame-damage section, not with a tube of painter’s caulk.
“People call a draft one thing. On the visit, I split it. Air at the lock or the sill is often weatherstripping or a sash that is not pulling in. Air at the casing is the joint to the wall. I write those as two lines, because one of them can be a repair and the other can mean the frame is done.” – Chris Perry, Project Manager, Weather Pro Windows and Doors
Condensation on the glass, and fog between the panes
Where the water sits decides whether you have a humidity problem or a dead sealed unit. Natural Resources Canada says condensation forms when moist indoor air meets a cooler surface, and it lists moisture between the glass panes as a sign the seal is broken. It recommends replacing the insulating glass unit.
Water you can wipe off
Droplets or frost on the room side of the glass, on the sash, or on the sill are indoor moisture landing on a cold surface. Health Canada tells homeowners to keep relative humidity between 30% and 50% when condensation is on windows, frames, and sills, and to run a dehumidifier if moisture is condensing on window panes or humidity is above 50%. The same guide says heavy curtains or blinds can trap cold air and moisture against the glass, and that frames and sills should be dried so water does not sit and grow mould. Health Canada has also concluded that indoor mould growth may pose a health hazard. Drying the sill is house care. It is not, by itself, proof the window has failed.
The federal condensation page adds two patterns that look like failure but aren’t. Closed drapes, a deep sill, or furniture against the glass can block warm air and let a cold pocket form. On a cool, calm, humid night, condensation can also form on the outside of the glass around sunrise, including on a high-performance unit. Wipe the outside in the morning. If the pane is clear from the room and the outdoor film is gone by mid-morning, you are looking at weather, not a broken seal.
A house that was draughty can show more room-side condensation after the leaks are tightened, because the old air change was carrying moisture out. Ventilation, bath fans, and a kitchen hood still belong in that conversation. A new window does not replace those fans.
Fog you cannot wipe off
If a cloth cleans the room side and the outdoor side and the haze is still there, the water is inside the sealed unit. The seal has failed. Natural Resources Canada treats that as a reason to replace the insulating glass unit. The Guide to Glass Options for Windows explains how a sealed unit is built. This page uses fog only as a sign.
The frame still decides the size of the job. A clear, square, dry frame can take a new unit. A soft sill under a fogged pane means you are not buying glass alone. State both facts at the measurement so the quote does not assume a sash swap in a frame that will not hold it.
One fogged pane in a bay, or one fogged lite in a three-section window, does not automatically condemn the other lites. Mark the lite. Leave the clear ones off the replacement list unless their frames have failed too.
A window that will not open, close, or lock
Operation is a daily test, and it is also a safety test. A sash that will not open blocks ventilation and, in a bedroom, blocks the way out if you need to leave through that opening. A sash that will not lock is a security gap. Neither complaint starts as an automatic new window. Both become one when the frame will not let the sash sit square.
Try the hardware first when the frame is solid. You can replace a casement crank that skips, a lock that misses its keeper, or a balance that no longer holds a hung sash. A slider that sticks only in one season may need a cleaned track and a look at the rollers. A torn screen is a screen, not a window. If the sash then closes and locks, and the draft check is clean, keep the window.
Replace it when the sash binds because the frame has racked. You will see a meeting rail that is tight at one end and gapped at the other, a casement that hits the frame before the lock catches, or a slider that has dropped and scrapes no matter how you set the rollers. Forcing that sash bends the hardware and can crack the glass. The opening needs a square unit, which a racked frame will not provide.
Paint, swelling, and a sash that was painted shut are a different case on an old wood window. Score the paint and free the sash before you price a replacement. If the wood underneath is soft once it moves, you are back to the frame, not the paint.
Soft frames, cracked glass, and noise you did not use to hear
Visible damage is a sign people trust, and you should read it by where it sits. A small chip on the outer pane of a sealed unit, with a dry frame and a sash that still locks, can be a glass question. A crack that runs to the edge, a frame that has split, or a sill that takes a fingerprint is a replacement question. Water staining under the sill, peeling paint that hides soft wood, or vinyl that has pulled away from the jamb means the wall joint has been wet. Covering it with interior trim leaves the wet material in the opening.
Outside noise that got louder over a few seasons usually tracks a seal, not a sudden change in traffic. A sash that no longer meets the frame, or a sealed unit that has lost its seal, lets sound through the same gaps that let air through. If the draft check and the fog check are clean and the noise is still the complaint, say so at the measurement. Pane count and a laminate are product choices for that goal. They are not a diagnosis, and this article does not assign a decibel number to either one.
Light leaking at the jamb at night is the same joint as a draft at the trim. If you can see outdoors through a gap beside the frame, foam and caulk are a patch only when the frame is still holding its shape. Daylight plus a soft corner means a full-frame job. Ice on the room side can still be frozen humidity. Ice between the panes is a failed seal. Use the wipe test before you treat every icy window as a dead unit.
Full frame window replacement when a repair will not hold
Full frame window replacement removes the existing frame back to the rough opening, with more labour, insulation, and new interior trim, when rot, a shifted opening, or a size change is present. A retrofit keeps a sound, square, dry frame and sets the new unit into it. The estimator confirms which path fits on site, because a new sash in a soft frame will not hold a seal.
When the frame can stay
Keep the frame when it is square, dry, and solid, the sill does not flex, and the drywall or plaster around it is clean. A failed seal in that frame is a glass or unit replacement. A worn crank in that frame is a hardware issue. In Weather Pro’s work, a vinyl window replacement is a new vinyl unit built for the measured opening. If the frame is sound, the retrofit path is the right one. You don’t need to tear the wall open to fix a fogged pane.
Check the warranty before you pay for that unit. Weather Pro’s windows carry a transferable lifetime warranty on the work it installs. If the failed window is already a Weather Pro unit, ask whether the seal or the hardware is still covered, and what the remedy is. Do not assume a fogged pane is automatically a no-charge part, and do not assume an older window from another company is covered by this warranty.
When the frame has to come out
Remove the frame when the sill or lower corners are soft, the frame is out of square, the opening needs to change size, or water has stained the wall around the unit. During a full frame replacement, the installer can see and insulate the cavity around the opening. A retrofit cannot reach that cavity. If the measurement finds rot in the rough opening, that repair is part of the quote, not a surprise after the trim is off.
“I press the sill and the lower corners on every opening. If the material is soft, or the frame has pulled away from the drywall, a new sash in that frame will not stay square. That is when the quote has to say full frame, including whatever we find in the rough opening, before anyone picks a colour.” – Chris Perry, Project Manager, Weather Pro Windows and Doors
A cracked pane over a sound frame can still be a unit replacement. A cracked pane over a soft sill is one job. List both so they aren’t priced as two small repairs.
What a window replacement quote should list
A window replacement quote is an installed price: the window, labour, sealing, and finishing. The pricing page is a budgeting list by style and size, not a contract. The exact figure follows the measurement. Bay, bow, and specialty shapes are quoted from the configuration. Doors are not on that window calculator.
Read the quote against the list you made in the house.
- Name each opening by room, and note the failure sign on the line: draft, fog, operation, or frame.
- Note whether the path is retrofit or full frame, and whether rot or a shifted opening is included or excluded in writing.
- Specify whether the glass package is double-pane or triple-pane, and include low-E and argon if that is the package.
- List hardware, screens, and grilles so a screen-only repair isn’t buried in a full unit price.
- Include removal and disposal, or price them separately.
- Upper-floor access, new interior trim, and any repair behind the frame are their own lines when they apply.
- The price is installed. A supply-only number is a different comparison.
The visit itself is a measurement, a look at the product, and a written estimate. What happens on install day, from the old unit coming out to the trim going back, sits in the guide to what to expect during window replacement. This page stops at the decision to book that visit.
Compare two quotes only after the paths match. A retrofit price and a full frame price for the same bedroom are not competing bids. A double-pane price and a triple-pane price are not competing bids either. Match the scope, then look at the number.
Checks that keep you from replacing a sound window
New windows are the right spend when the unit or the frame has failed. They are the wrong spend when the house has a humidity problem, a painted sash, or a screen. The misses show up in the same rooms, and most of them are visible before anyone orders a unit.
- We book every wet window for replacement, including panes you can wipe dry. Humidity and airflow come first. The failed seal is only the haze that stays.
- Treat a sunrise film on the outside glass as a dead seal. Wipe the outside. If it clears, the federal page is describing weather on the outer surface.
- Caulk is run around a soft sill and called a repair. The soft material is still in the wall. The draft will return, or the next sign will be stained drywall.
- Leave a bedroom sash that will not open because the glass looks new. Operation is the sign. A clear pane that will not open is still a problem.
- One fogged lite becomes a whole-house order. Mark the lite. Price the lite. Leave the clear, square openings off the list.
- The quote names a style and a colour and never says retrofit or full frame. You cannot compare that number with another company.
- Age is used as the only reason. A twenty-year-old unit that locks, stays clear, and shows a dry sill can stay. A younger unit with fog between the panes cannot.
If you are unsure which row an opening is on, write the symptom and leave the verdict to the measurement. Guessing “replace them all” and guessing “it only needs caulk” are the same kind of miss.
The failed part decides, not the year on the frame
Replace your windows when the check says the sealed unit or the frame is done: fog you cannot wipe off, a sash that will not sit square, or a sill that is soft, cracked, or pulling away from the wall. A draft at the weatherstripping, a crank that skips, and water you can wipe off the room side are service and house-care items when the frame is still sound.
Full frame window replacement is the larger path, and it is the correct one when the opening itself has failed. A retrofit is the smaller path, and it is the correct one when the frame can stay. Vinyl window replacement at Weather Pro is a new vinyl unit for the measured opening, on one of those two paths. The glass package is chosen after that, not instead of it.
Bring the room-by-room list to a free in-home estimate. Ask the estimator to mark, for each opening, the sign you found and whether the frame stays. That is the scope a second quote can match, and it is the scope that keeps a sound window in the wall.
Frequently Asked Questions
How do I know if I should replace my windows?
Replace the window when a closed sash lets a draft through that weatherstripping will not stop, when fog stays between the panes after you wipe both faces, when the sash will not open or lock because the frame is racked, or when the sill and corners are soft or cracked. A torn screen, a worn crank, and room-side moisture you can wipe off can be repaired if the frame is square and dry. Walk the house once and write a line per opening before you ask for a price. Age alone doesn’t decide.
Is condensation a sign I need new windows?
Condensation on the room side of the glass is often moist air on a cold surface. Health Canada recommends a relative humidity between 30% and 50%, drier sills, and airflow that curtains can block. Condensation between the panes, which a cloth cannot remove, means the seal has failed. In that case, Natural Resources Canada recommends replacing the insulating glass unit. Ice on the room side can still be humidity. Ice between the panes indicates a failed seal.
What is full frame window replacement?
Full frame window replacement takes the existing frame out to the rough opening. It is the path when the frame is rotten, the opening has shifted, or the size has to change, and it includes more labour, insulation, and new interior trim. A retrofit leaves a sound frame in place and sets the new unit into it. Weather Pro confirms the right path after checking the sill and corners on site. Rot found in the rough opening is a separate line on the quote.
What is vinyl window replacement?
Vinyl window replacement, in this work, is a new vinyl window built for an existing home and installed in the measured opening. Weather Pro manufactures those vinyl units and installs them with its own crews. On a square, dry frame, the job can be a retrofit. On a soft or shifted frame, it is a full frame replacement. The vinyl material does not decide the path. The condition of the opening does.
What should a window replacement quote include?
A window replacement quote should list each opening, the failed sign, and whether the frame stays. It should state double pane or triple pane, include removal, and show access, new trim, or hidden rot as their own lines when those apply. Weather Pro’s pricing page publishes installed budgeting ranges for standard styles. The figure you accept is the one written after measurement. Match retrofit to retrofit, and full frame to full frame, before you compare two totals.
Can a foggy window be repaired instead of replaced?
If you can wipe the fog off the room side, it’s a humidity and airflow problem, and you may not need a new window at all. Fog between the panes means the seal has failed, and the correction the federal page names is a new insulating glass unit, or a new window if the frame is also bad. If the frame is square and dry, ask whether a new unit in that frame is the job. A full frame replacement is the path when the sill or the corners have failed, not the automatic answer to fog alone.
Do drafts always mean the window is finished?
Drafts do not always mean the window is finished. Air at the weatherstripping can come from a crushed sweep or a sash that isn’t pulling in, and that can be serviced. Air at the casing can be a joint to the wall that needs sealant or low-expansion foam, if the frame is solid. If a draft remains after that service, or if it’s beside a soft sill, it points to replacement. Check the sash and the trim separately, and write down which one moved.
Does a window that will not open need to be replaced?
A window that will not open needs a diagnosis before you replace it. Free a painted sash, replace a skipped crank, or clean a track when the frame is still square. Replace the window when the sash binds because the frame has racked, the lock cannot catch, or the meeting rail is tight at one end and open at the other. In a bedroom, a sash that will not open is also an exit problem, so don’t leave it stuck just because the glass still looks clear.
