How Long Does Window Replacement Take? Per Window and Full House
A single window takes 30 to 45 minutes once my crew’s tools are out and the ladder’s up. A full house â 15 to 20 windows â runs one to three days, depending on install method and how many hands you’ve got on site. Somebody quotes you a week for a standard retrofit, they’re either padding hours or they don’t know the trade.
Per-Window Install Times
I’ve installed thousands of these in 31 years. The time depends on the method. Pocket replacement â new window drops right into the old frame â is quick work. Full-frame, where you tear down to the studs, takes three to four times as long. There’s no shortcut around that.
| Install Type | Time Per Window | Notes |
|---|---|---|
| Pocket/insert replacement | 30-45 min | Existing frame is sound, no rot |
| Full-frame replacement | 2-3 hours | Removing trim, flashing, sometimes siding |
| Bay or bow window | 3-5 hours | Structural support work adds time |
| Egress window (basement) | 4-8 hours | Sometimes you’re cutting concrete or framing |
Full House Timelines
Two guys doing pocket replacements on a 15-window ranch will finish in a day, maybe a day and a half. Throw in full-frame work, a second story, or old aluminum frames with paint that needs babying, and now you’re at two to three days. I put pocket windows in a ranch house in Sedalia once â ten windows, done by lunch the next day. That’s the good version of this job.
- 10 windows, pocket replacement: 1 day
- 20 windows, pocket replacement: 1.5-2 days
- 15 windows, full-frame: 2-3 days
- Whole house with siding repair: 3-5 days
What Actually Slows a Job Down
Homeowners always ask why the two-day estimate turned into four. Here’s what I check before I ever put a number on paper.
- Rot in the framing. Pull the trim, find soft wood, and that’s not a swap-and-go job anymore. Now you’re doing carpentry.
- Custom sizes. Standard sizes from Pella, Andersen, or Milgard ship fast. Arched tops, odd egress dimensions â those can add weeks before install even starts. That’s lead time, not labor.
- Lead paint. Houses built before 1978 need EPA RRP containment if the trim’s got old paint on it. Adds 15-20 minutes per window, minimum.
- Weather. Try doing a full-frame swap with the wall open in a downpour. I’ve had one-day jobs turn into three-day jobs waiting out a storm.
Lead Time vs. Install Time â Don’t Confuse Them
The install is the fast part. What eats your calendar is manufacturing lead time. Marvin and Andersen both quote 4-8 weeks standard, up to 12 for custom sizes or specialty glass. Milgard runs faster on vinyl lines, closer to 3-6 weeks. NFRC-rated products with specific U-factor or SHGC numbers for your climate zone sometimes come off a dedicated production run. That adds time too.
So when someone says window replacement takes three months, they’re talking measure, order, wait, install â the whole process. The labor itself is a sliver of that.
What I’ve Seen in the Field
I walked onto a job once where a “one-day” crew from a big-box store left half the house untouched. They hit rot they weren’t ready for and didn’t have lumber on the truck. I’ve also seen crews rush a full-frame job to hit a one-day promise, skip proper flashing, and cause a leak that didn’t show up until the next hard rain â six months later, behind drywall nobody’s checking.
Fast doesn’t mean good. A rushed crew skips shimming right. They skip checking plumb and square before fastening. They skip the low-expansion foam seal that ENERGY STAR performance depends on. A full-frame, two-story job with 20 windows finished in six hours? Ask questions. That’s not skill. That’s corners getting cut.
Red Flags on Timeline Promises
Same-day promises on a whole-house full-frame job don’t hold up â not with proper flashing and insulation work done right. If the contract doesn’t mention manufacturing lead time, push back. You need a firm order date, not just an install date. If the quote doesn’t separate pocket from full-frame, that’s a problem â it’s a 3x time difference and it changes your price. And if the crew never asks how old your house is, that’s a red flag too. Pre-1978 homes need lead paint protocols. Skip that step and you’re breaking federal law, not just cutting corners.
Ask straight up: “Is this pocket or full-frame, and what’s your crew size?” That answer tells you more about your real timeline than anything else in the estimate.
You want it done right the first time â proper flashing, correct fastening schedule, no shortcuts on the foam seal â find a licensed installer in your area who’ll walk you through pocket versus full-frame before they ever swing a pry bar. For other markets, localto.co has you covered too.
â Frank Mercer, Licensed GC (Ret.) | HAAG Certified Roof Inspector
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