Windows and doors
Window glass replacement cost
Replacing the glass in a window is about $265 for a single pane in an old wood sash and $392 for a fogged 30 × 40 in double-pane unit — $297 each when three go on one visit, since the glazier's minimum is shared. Low-E with argon is $458; a sliding patio door panel, tempered by law, $966. Fog between the panes is a failed seal and is replaced, not repaired. And when the glass for an opening passes about half the price of a new window, the window is the better buy.
Written and edited by Pablo Ruiz Quintero
Last reviewed 2026-09-25 · Nothing you type leaves your browser
Window glass replacement cost calculator
The glass, not the window
Measure the glass, not the frame. A fogged double-pane unit is made to order and fitted on a second visit; a single pane is cut and set the same day.
A sealed insulated unit: two panes, a spacer, dry air. Made to the exact size and thickness of the old one.
The stops pop out, the old unit comes out on its tape, the new one goes in on new glazing tape.
Same size, one visit.
The visible glass plus about ½ in.
8.3 sq ft a pane.
Ordinary annealed glass.
The pane is intact or fogged.
A glazier.
Used only to pick a regional labour rate. It stays in your browser.
2 sealed units — double pane, clear
$608
$304 each · 30 × 40 in · 8.3 sq ft
The glass is the cheaper fix
$304 a pane against $702 for a new vinyl replacement window: while the sash and frame are sound, reglazing is the cheaper fix.
Fog between the panes
A failed seal is replaced, not repaired.
Once moist air has got past the edge seal of a double-pane unit, the fog comes and goes with the weather and the argon is gone. Defogging services drill and dry the unit; the seal stays broken. A new sealed unit goes into the same sash.
Four kinds of glass
The same 2 openings, ordinary glass, fitted by a glazier.
What the glazier charges for
- 2 × 30 × 40 in sealed units
double pane, clear. A sealed insulated unit: two panes, a spacer, dry air. Made to the exact size and thickness of the old one.$433 - The glazier
The stops pop out, the old unit comes out on its tape, the new one goes in on new glazing tape.$160 - Up to the service-call minimum
A glazier's minimum for coming out — for sealed units, the measure and the fitting visits.$15
What it costs
National average. 2 30 × 40 in sealed units, double pane, clear, in a vinyl or aluminium sash. Not included: a rotted sash, new balances or hardware, or painting the putty.
A whole new window instead, on the window replacement page; a whole new sliding door, on the patio door page; the screen in front of it, on the window screen page.
Worth knowing
- A 30 × 40 in double pane, clear unit is made to order: the glazier measures, the unit is built to the exact size and thickness of the old one, and it comes back in one to two weeks to be fitted. $217 of glass, and $88 of fitting and service call.
- Fog between the panes is a failed edge seal: moist air got in, and the argon, if there was any, got out. It cannot be cleaned or resealed from outside; the sealed unit is replaced, and the sash and frame stay.
- Replacing each unit is $304 against about $702 for a new vinyl replacement window in the same opening: the glass is the cheaper fix while the frame is sound.
- If this glass is in or beside a door, in a pane larger than 9 sq ft within 18 in of the floor, near a tub or shower, or on a stair, the code requires tempered or laminated glass — about 60% more.
- Low-E with argon is about $133 more for these units, and the upgrade worth making while it is being replaced.
On this page — 5 sections
The glass, not the window
The short version
- Single pane: $265. Cut and fitted the same day.
- Double-pane unit: $392; $297 each for three. Made to order.
- Sliding door panel: $966. Always tempered.
- Past half a new window’s price, replace the window.
Replacing window glass leaves the frame and the sash where they are and changes what is in them. A single pane of ordinary glass is cut in the shop and set the same day, in putty or behind stops. A double-pane window’s glass is a sealed unit — two panes, a spacer, dry air or argon — built to the exact size and thickness of the old one, so the glazier measures on one visit and fits it on another. Glass is priced by the square foot with a minimum per piece, and the glazier’s visit — about $175 as a minimum — is shared by every pane done on it.
$265
Single pane
24 × 30 in, wood sash
$392
Double-pane unit
30 × 40 in, clear
$458
Low-E and argon
Same size
$966
Patio door panel
34 × 76 in, tempered
MaterialsEstimator, Window glass replacement price survey · checked 2026-09-25
Fog between the panes
Fog that cannot be wiped from either side is inside the unit: the edge seal has failed, moist air is getting in and condensing, and any argon has leaked out. It cannot be resealed in place. Defogging services drill the glass, dry it and plug the holes, which clears the view for a time and leaves the seal broken. The fix is a new sealed unit in the old sash — and, since it is being replaced anyway, low-E with argon for about $66 more a unit.
| New glass in the old sash | New replacement window | |
|---|---|---|
| One 30 × 40 in unit | $392 | $702 |
| Three on one visit, each | $297 | $702 |
| 60 × 48 in picture, low-E | $855 | $987 |
| New seals, balances, weatherstripping | No | Yes |
| Works when the frame is rotten | No | Yes |
Insulating Glass Certification Council / glass manufacturers, Insulating glass units — edge seals, seal failure and replacement · checked 2026-09-25
MaterialsEstimator, Replacement window price survey · checked 2026-09-17
Safety glass where the code wants it
Some glass has to be safety glass whatever it replaces. The building code calls these hazardous locations, and in them the replacement is tempered — heat-treated so it breaks into blunt pieces — or laminated, which cracks but stays in the frame. Tempered glass is about 60% more and is made to order, because it cannot be cut once tempered. Every piece carries a small etched mark in a corner; if the old glass has one, the new one needs it too.
Where replacement glass must be safety glass
- In any door, including sliding patio doors and storm doors.
- Within 24 in of a door's edge, when the bottom is under 60 in from the floor.
- A pane over 9 sq ft with its bottom under 18 in and its top over 36 in from the floor.
- In walls and enclosures around tubs, showers, hot tubs and pools, under 60 in above the standing surface.
- Beside stairs, ramps and landings, low to the walking surface.
International Code Council, IRC R308.4 — Hazardous locations requiring safety glazing, and R612 — Exterior door installation (2021) · checked 2026-09-23
| Tempered | Laminated | |
|---|---|---|
| 30 × 40 in double-pane unit | $522 | $565 |
| When it breaks | Small blunt pieces | Cracks, stays in the frame |
| Security and noise | Ordinary | Better |
| Meets the safety-glazing rule | Yes | Yes |
Sliding door glass
A sliding patio door panel is the biggest piece of glass in most houses, and all of it is a hazardous location: the replacement is tempered or laminated by law. The glazier lifts the panel out, opens the frame, sets a new tempered unit and rehangs and adjusts the door. At 34 × 76 in, that is about $966 clear and $1,196 with low-E. If the rollers, the track or the frame are also worn, a whole new door is the next thing to price.
National Fenestration Rating Council, NFRC certified ratings: U-factor, SHGC and visible transmittance · checked 2026-09-17
What goes wrong
Before the glazier comes
- Every fogged, cracked or broken pane listed, for one visit.
- The glass measured: visible size plus about half an inch each way.
- Single or double, and any etched mark in a corner copied down.
- Doors, low glass, bathrooms and stairs flagged: safety glass.
- The sash checked for rot — a soft sash means a new window.
01Ordinary glass in a door or beside a tub
It breaks into shards, and it fails inspection.
Instead — Tempered or laminated, marked.
02Paying to defog a failed unit
The seal stays broken and the fog comes back.
Instead — A new sealed unit.
03One pane per visit
Each visit pays the $175 minimum.
Instead — Every pane together.
04Measuring the frame, not the glass
The unit is ordered to the sixteenth and will not fit.
Instead — The glass, and let the glazier confirm.
05Clear glass where low-E costs little more
The upgrade is about $66 a unit while it is apart.
Instead — Low-E and argon.
06New glass in a rotting sash
The sash fails around the new unit.
Instead — A new window.
- 01Find what is wrongA crack or a break is the glass; fog between two panes is a failed seal; a draught round the glass is the putty or the stop.
- 02Count the panesEvery fogged or broken unit, so they go on one glazier's visit.
- 03Measure the glassThe visible glass, plus about half an inch each way for the part in the frame; the glazier measures exactly before ordering.
- 04Note the glassSingle or double, clear or tinted, and any etched mark in a corner: tempered, laminated, low-E.
- 05Check where it isIn or beside a door, low and large, near a tub or a stair: it has to be safety glass.
- 06Compare it with a new windowPast about half the price of a new window for the same opening, replace the window.
When the frame is soft, several units are fogging, or the glass is close to half the price, replacing the window is the better buy.
A new window instead- Insulated glass unit (IGU)
- Two or three panes held apart by a spacer and sealed round the edge: the glass in a double-pane window. Replaced whole, made to size.
- Seal failure
- The edge seal of an IGU letting moist air in: fog between the panes that cannot be wiped off.
- Annealed glass
- Ordinary window glass, cut to size in a shop. Breaks into sharp shards.
- Tempered glass
- Glass heat-treated after cutting so it breaks into small blunt pieces. Required in doors and other hazardous locations; cannot be cut afterwards.
- Laminated glass
- Two sheets bonded to a plastic interlayer: it cracks but stays in the frame. Safety glass, and quieter and harder to break through.
- Low-E
- A microscopically thin metal coating that reflects heat. With argon in the gap, the upgrade worth making when a unit is replaced.
- Sash
- The frame that holds the glass and moves; the glass is replaced in it, and it stays.
- Glazing stop
- The strip that holds the glass in a vinyl, aluminium or modern wood sash. Pops out to change the unit.
- Glazing points and putty
- How glass is held in an old wood sash: small metal points and a bevel of glazing compound.
- Reglazing
- Replacing the glass — or just the putty — in an existing sash.
Common questions
- How much does it cost to replace window glass?
- About $265 for a single pane in an old wood sash, $392 for a 30 × 40 in double-pane unit in a vinyl window, and $458 with low-E and argon. More panes on the same visit share the glazier's minimum: three double-pane units are $890, $297 each.
- How much does it cost to replace a double-pane window glass?
- About $392 for a 30 × 40 in clear sealed unit fitted in the existing sash, $458 with low-E and argon, and $575 for triple pane. A new vinyl replacement window for the same opening is about $702, so a single unit on its own is already 56% of the window.
- Is it cheaper to replace the glass or the whole window?
- The glass, while the frame and sash are sound: $297 a unit for three against about $702 for a new window. A single unit on its own visit, a tempered unit or a big picture window gets close to a new window's price — past about half, the window is the better buy, especially if the frame is rotting or more units are fogging.
- How much does it cost to replace a window pane?
- A single pane of ordinary glass in a wood sash, 24 × 30 in, is about $265 with the glazier, or $115 yourself. Broken and boarded up until the glazier comes, about $390.
- How much does sliding glass door glass replacement cost?
- About $966 for a 34 × 76 in tempered double-pane unit in the existing door panel, and $1,196 with low-E. Door glass is always tempered or laminated — the code requires it — which is why it costs more than a window of the same size.
- Can fogged double-pane glass be fixed?
- Not really. Fog between the panes means the edge seal has failed; the moisture and the loss of argon come with it. Defogging services drill, dry and plug the unit, which clears the view for a while but leaves the seal broken. The fix is a new sealed unit in the same sash.
- Does replacement glass have to be tempered?
- In the hazardous locations the building code lists — doors and the glass beside them, large panes low to the floor, near tubs and showers, on stairs — yes, tempered or laminated. Elsewhere, ordinary glass is fine. Tempered is about 60% more (a 30 × 40 in unit is $522), laminated about 80% ($565).
- How long does it take to replace window glass?
- A single pane is cut in the shop and fitted the same day. A sealed double-pane unit or tempered glass is made to order: the glazier measures, the unit arrives in one to two weeks, and it takes under an hour to fit.
- Can I replace window glass myself?
- A single pane in a wood sash is the classic do-it-yourself job: about $115 for the glass and glazing supplies. A sealed unit can be ordered from a glass shop — about $242 for a 30 × 40 in — and set in a vinyl sash with snap-in stops; the measurement and the unit thickness are what go wrong.
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About the author
Pablo Ruiz Quintero — Editor
Editor of MaterialsEstimator. Decides which documents count as a source, what every default value is, and where the line sits between what the reader parses and what the engines compute.
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