Step one: find out what actually failed
Before anyone quotes you, spend ten minutes at the window with a screwdriver and a flashlight. What you find there decides whether this is a $120 repair or a $900 replacement, and no estimator will make that call more conservatively than you will.
The two-minute diagnosis
- Milky haze or droplets between the panes: the insulating glass seal has failed
- Sash drifts down on its own: balances or springs, not the window
- Draft at the meeting rail with the lock engaged: weatherstrip or a warped sash
- Screwdriver sinks into the bottom rail or sill: rot, and the clock is running
- Cracked glazing putty on an old wood unit: maintenance, not failure
Photograph it before you call
Take shots from inside, from outside, and at a low angle along the sill and the exterior trim. Every company will ask, and the ones who can price from photos will save you a visit fee on a job this small.
While you are standing there, check the two units either side of it. They were built the same year, face the same weather and carry the same seal life, and what you find on them changes the shape of the whole project.
Step two: choose glass, sash or the whole unit
Glass-only work on a failed seal typically runs $175 to $450 when the frame is sound and the sash can still be sourced. Balance kits are $40 to $120 in parts. A full replacement unit on one opening usually lands $525 to $1,050 in vinyl in 2026, and $900 to $1,900 in wood or clad wood.
Two things push you to the whole unit even when the frame looks fine. The first is a manufacturer that no longer exists, which describes a great deal of 1990s vinyl. The second is a frame far enough out of square that a new sealed unit will never sit evenly in it.
| What you found | Usual fix | Typical 2026 cost |
|---|---|---|
| Fog between the panes | Sealed glass unit or replacement sash | $175 to $450 |
| Sash will not stay up | Balance or spring kit | $40 to $120 in parts |
| Draft at the meeting rail | Weatherstrip and lock adjustment | Under $150 |
| Cracked pane in a wood sash | Re-glaze the existing sash | $150 to $350 |
| Soft sill or bottom rail | Full replacement unit | $525 to $1,050 in vinyl |
That fourth row deserves a note. On an older wood window with sound joinery, re-glazing keeps old-growth sash that no manufacturer sells anymore, and it is done in a day instead of seven weeks.
Step six: lead time, install day and Indiana weather
A custom-size unit generally takes three to seven weeks to arrive in 2026. Book the install into a stretch with a clean forecast. The opening sits open for an hour or two, and nobody wants that while a spring storm line is crossing Bellwood.
On the day, clear three feet of floor inside and three feet of ground outside, pull the blinds and curtain hardware yourself, and move furniture out of the path. A straightforward insert takes one and a half to three hours. Full frame in a masonry opening can take most of a day. In a home built before 1978 the crew should be setting containment and following lead-safe work practices, which adds time and shows up in the price.
Two approvals catch people out at this stage. Some older districts and subdivisions run architectural review that applies even to one replacement, particularly on a street-facing wall. And while a like-for-like insert generally needs no permit, enlarging an opening does. Both are quick phone calls, and both cost far less made before the unit goes into production than after.
Step four: ask three Bellwood companies the same questions
Three quotes on one window is not overkill, because the spread is wide and the reasons for it are rarely printed on the sheet. Ask each of them:
- Is there a job minimum, and what is it
- Insert or full frame for this specific opening, and why
- What happens to the price if you find rot behind the trim
- Who performs the install, in-house crew or subcontractor
- How long is the labor warranty on a single-unit purchase
That last one catches people. Labor coverage on a one-window sale is sometimes shorter than the coverage attached to a full-house contract from the same company.
Then compare like with like. If one quote is an insert and another is a full-frame conversion, they are not competing, they are answering different questions about the same hole in the wall. Ask the low bidder what the high bidder saw, and ask the high bidder what the low bidder is leaving out. On a job this size both will usually tell you.
Step five: lock the spec before you sign
Glass
Low-E and argon are standard on anything current. Which Low-E coating is the real decision: a coating tuned to reject solar heat suits a west-facing wall that bakes through July, while a higher solar gain coating can make sense on a shaded north wall. Tempered is required near doors, low to the floor and around tubs and showers, at roughly $75 to $200. Obscure glass for a bathroom runs $50 to $150.
Everything visible from the sidewalk
Grid pattern, grid width, exterior color and hardware finish all have to answer to what is already on that wall. Get them on the order in writing. Colors add cost and typically two to four weeks of lead time, and neither can be changed once the unit is in production.
Step eight: decide whether to stop at one
Once the crew has been out, you know two things you did not know a month ago: what this company actually charges, and what condition the rest of that wall is in. South and west elevations take the most sun and the most driving rain, so the units flanking the one that failed are usually next in line.
Adding openings on a separate visit later means paying mobilization a second time. Adding them to this order often costs $400 to $600 each. If two more are marginal, price them now and make the decision with real numbers instead of guessing at it next winter.
Step three: measure the opening before anyone visits
The six measurements
Width at the top, the middle and the bottom. Height at the left, the center and the right. The smallest of each set is the working number. Older homes settle, and a quarter inch of variation across an opening is completely normal in a house built before the war.
What the level tells you
Lay a level on the sill and hold one against each jamb. A sill out by more than roughly a quarter inch across the width is a full-frame conversation rather than an insert, and knowing that in advance keeps a surprise off install day.
Step seven: the walkthrough that protects your money
- Operate the sash five times, lock and unlock it, tilt it in if it tilts
- Check that the reveal is even top to bottom on both sides
- Look for continuous exterior sealant with no gaps at the corners
- Run a hand around the interior stop on a windy day and feel for movement
- Confirm the screen fits and the weep holes at the exterior sill are clear
- Collect the warranty paperwork and the manufacturer certification statement
Hold the final payment until the punch list is closed. On a job this size the balance is the only leverage you have, and a crew that does good work will not object to a ten-minute inspection.