How Long Does Window Glass Replacement Really Take?


One of the most common questions I get from homeowners is, “How long will the replacement take?”
The truth is, most glass jobs are quicker than people expect — but every window is a little different. Here’s exactly how long the process takes and what affects the timeline, straight from a technician who does this every day.

1. The On-Site Replacement Time (The Actual Work)

For standard residential windows, the replacement usually takes:

➡️ 20–40 minutes per window

That includes:

  • Removing the old broken or foggy unit

  • Cleaning out the frame

  • Installing the new glass

  • Squaring it properly

  • Sealing it

  • Final cleanup and testing

If the frame is in good shape and easily accessible, it’s a very quick job.

2. When It Takes Longer

Some windows take more time due to their construction:

Vinyl Windows

20–30 minutes
Fairly straightforward — most are designed for quick glass replacement.

Aluminum Windows

30–60 minutes
Aluminum requires removing pressure beads or tight glazing stops, which can slow things down.

Wood Windows

45–90 minutes
Wood frames often have paint buildup, swollen trim, or brittle stops. I work slower on these to avoid cracking the wood.

Second-Story Installations

Add 10–20 minutes for ladder setups, safety checks, and extra handling.

Large Picture Windows

Add 20–40 minutes
These require two technicians because of size and weight.

3. The Part Homeowners Don’t See: Manufacturing Time

This is the part people forget — we can’t install the glass until it’s made.

For custom double-pane units, the average lead time is:

➡️ 5–10 business days

Factors that can add time:

  • Tempered glass (must be heat-treated)

  • Odd shapes or oversized panes

  • Low-E coatings or special tints

  • Busy seasons (winter + summer)

Single-pane or basic glass types are usually faster.

4. Emergency Board-Ups

If a homeowner needs the opening secured immediately:

Board-up installation: 10–15 minutes

We return later once the new glass arrives.

5. What Speeds Up the Job

The job goes faster when:

  • The opening is clear of furniture

  • Trim isn't painted shut

  • The frame isn’t warped

  • We can park close to the property

  • Homeowners already know the window brand or model

Small things make a big difference.

6. What Slows Down the Job

These add time:

  • Stuck or brittle glazing stops

  • Rotten wood

  • Rusted or bent aluminum frames

  • Broken sash tracks

  • Hard-to-reach windows

  • Weather (rain on exterior installs)

We never rush replacements — a properly sealed unit is more important than speed.

7. The Bottom Line

Most window glass replacements take less than an hour per window.

But the overall timeline depends on the manufacturing time for the new glass.

Typical total timeline:

  • Measure appointment: 10–15 minutes

  • Manufacturing: 5–10 business days

  • Installation: 20–60 minutes per window

For homeowners, the replacement day is quick and painless. Most customers are surprised by how little disruption there is.

Reza Tavakoli