How Long Does Window Replacement Take? Timelines and What to Expect

How Long Does Window Replacement Take? Timelines and What to Expect

Most homeowners in Los Angeles assume the install crew shows up, pops out the old windows, and by dinner the house has new glass. The reality is closer to a four-act play spread across three to four months, and the single biggest delay has nothing to do with hammers or caulk. It’s the 6-to-14-week manufacturer lead time that contractors tend to mention in the fine print, after you’ve already signed. This guide breaks the entire window replacement timeline into its four distinct phases, tells you where Los Angeles specifically adds time nobody warns you about, and gives you the questions to ask before you commit to a schedule.

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Quick Answer

Window replacement in Los Angeles typically takes 10 to 18 weeks from first phone call to final inspection. The actual installation is usually only 1 to 3 days for a full house of windows; the rest of the timeline is measurement, ordering, and waiting for the Los Angeles Department of Building and Safety to sign off. Anyone who quotes you “a day per window” is talking about labor only, not the calendar.

Table of Contents

• Phase One: The Measure and Quote (Same Day to 3 Days)
• Phase Two: Manufacturer Lead Time (6 to 14 Weeks)
• Phase Three: The Install Window (1 to 3 Days)
• Phase Four: The Los Angeles Inspection Queue (2 to 4 Weeks)
• Seasonal Timing: Why October Orders Slip Into January
• How to Read a Contractor’s Timeline Promise
• What a Written Schedule Commitment Should Look Like
• Common Mistakes to Avoid
• When to Call a Professional

Phase One: The Measure and Quote (Same Day to 3 Days)

This is the phase that should move fastest, and at Westlight Windows & Doors home we schedule it the same week you call. A technician comes out, measures every window opening, checks the condition of the framing, and notes whether you’re dealing with stucco, wood siding, or something else. That last detail matters more than most homeowners realize, because Los Angeles houses built before 1980 often have stucco exteriors that affect whether you need a retrofit or full-frame installation.

The measure itself takes 60 to 90 minutes for a typical three-bedroom house. After that, you should receive a written quote within one to three business days, not three weeks. If a contractor can’t turn around a quote in under a week, that’s a signal about how the rest of the job will go. The quote should include the window sizes, the manufacturer line, the glass package, and the total installed price in writing. At Westlight, every homeowner gets that written price before any work starts. No exceptions, no “we’ll finalize numbers after we open the wall.”

What can delay this phase: a contractor juggling too many bids, a salesperson who has to “check with the office” on pricing, or a homeowner who hasn’t decided between product lines. You can compress it by knowing roughly what you want before the measure happens. Browse our more guides & resources, understand the difference between a standard double-hung and an impact-rated window, and come ready to make a decision.

Phase Two: Manufacturer Lead Time (6 to 14 Weeks)

Here is the number that surprises every homeowner we sit down with in Los Angeles: after you approve the quote and put down a deposit, the windows have to be manufactured. They are not sitting on a shelf somewhere. Custom-sized windows are built to your exact opening dimensions, and that takes time.

Current lead times, as of 2025 and holding into 2026, run 6 to 14 weeks depending on the manufacturer and product line. A standard vinyl window from a line like Mr-Glass or ViewLux often lands in the 6-to-9-week range. Impact-rated windows from PGT, which many Los Angeles homeowners choose for hillside or canyon-adjacent properties, run closer to 10 to 14 weeks because the laminated glass and reinforced frames have a longer production cycle. Entry doors from Therma-Tru typically fall in the 8-to-12-week window.

Nobody can wave a hand and make a factory in Florida or Texas build faster. What a good contractor can do is tell you the lead time honestly before you sign, and order the product the day the deposit clears, not two weeks later when someone remembers to submit the paperwork. Ask for the order confirmation number from the manufacturer. It’s your proof that the clock actually started ticking.

Phase Three: The Install Window (1 to 3 Days)

Good news: this is the fast part. A full house of windows, typically 10 to 15 openings, installs in one to three days with a competent crew. A single window takes about 45 minutes to an hour for a retrofit, longer for a full-frame replacement where the old frame comes out and new flashing goes in.

What stretches the install day? The layout of your house, for one. A single-story ranch in the San Fernando Valley moves faster than a three-story hillside home where every window requires ladder work or scaffolding. Stucco exteriors add time because the crew has to cut clean lines and reseal carefully; wood siding is usually more forgiving. Retrofit installations, where the new window fits inside the existing frame, take less time than full-frame replacements, which involve removing the old frame down to the studs and rebuilding the opening.

Crew size matters too. Two installers on a 14-window house is a three-day job. Four installers might knock it out in a day and a half. The quality doesn’t change based on speed; the logistics do. At Westlight, we’ve found that a three-person crew hits the sweet spot for most Los Angeles homes, fast enough to keep disruption short but careful enough to leave the site cleaner than we found it. That’s part of the Window Installation in Los Angeles standard we hold ourselves to.

Phase Four: The Los Angeles Inspection Queue (2 to 4 Weeks)

If you’re doing a full-frame window replacement in the City of Los Angeles, the project requires a building permit, and the permit requires an inspection after the work is done. The Los Angeles Department of Building and Safety currently runs an inspection queue of two to four weeks, depending on the district office and the time of year. This is the delay nobody mentions in the sales pitch, and it’s the one that has nothing to do with your contractor’s competence.

Retrofit installations, where the existing frame stays in place, often don’t trigger a permit requirement in Los Angeles. Full-frame replacements generally do, because you’re altering the building envelope. A legitimate contractor pulls the permit, schedules the inspection, and meets the inspector on site. The permit adds cost and time, yes, but it also protects you. An unpermitted window installation can complicate a future home sale in Los Angeles, where buyers and title companies increasingly ask for permit records.

The inspection itself takes 30 minutes. The inspector checks for proper flashing, weatherproofing, and installation per the approved plans. Once it passes, you get a sign-off, and your project is officially complete. Until that sign-off, the calendar isn’t done.

Seasonal Timing: Why October Orders Slip Into January

Los Angeles doesn’t have a winter in the Minnesota sense, but it has a rainy season that runs roughly November through March, and that shapes the window replacement calendar more than most people expect. For maintenance tips throughout the year, read our Seasonal Windows & Doors Care for Los Angeles: Year-Round Homeowner’s Guide. Contractors book heavily in the dry months, May through October, because installs happen faster when there’s no storm threat. The manufacturers also see demand spike nationwide in spring and early summer, which stretches lead times on popular product lines.

If you want your windows in before the end of the year, order by early September at the latest. If you wait until October, here’s what happens: the manufacturer quote comes back at 12 to 14 weeks because the factory is backed up with holiday-season orders, the install lands in late December or early January, and the Los Angeles inspection queue is running slow because city offices close for holidays. A September order might be a November install. An October order can easily slip into January or February.

The smart play is to order before June. You’ll catch shorter manufacturer lead times, you’ll install in late summer or early fall when the weather is predictable, and you’ll have the inspection wrapped before the holiday slowdown. If you’ve already missed that window, don’t panic. Just adjust your expectations and plan for the longer timeline. A good contractor will tell you all of this up front instead of promising a six-week job that quietly becomes a sixteen-week job.

How to Read a Contractor’s Timeline Promise

When a contractor says “we can start in two weeks,” that sentence is doing a lot of heavy lifting. “Start” might mean the crew arrives with windows in hand, or it might mean the salesperson schedules your measure. Those are two very different things, and the gap between them is where homeowner frustration lives. In our experience across Los Angeles, the homeowners who feel burned are usually the ones who never got a written schedule with specific dates attached to specific milestones. For help vetting your contractor, see our guide on How to Hire a Windows & Doors Contractor in Los Angeles: A Step-by-Step Guide.

Here’s what to ask, and what the answers should sound like:

1. What does “start” mean exactly? The answer should be a calendar date, not a range. “We begin measure on August 12th” is an answer. “We’ll be in touch in a few weeks” is not.
2. When does the manufacturer order go in? It should be within 48 hours of your deposit clearing. Ask for the order confirmation number.
3. What’s the current lead time on the product line you’re quoting? If they can’t answer without “checking,” they haven’t checked recently. Walk away or wait.
4. When will the install crew arrive, and how many people are on the crew? A two-person crew and a four-person crew have different daily capacity. Know which one you’re getting.
5. Who handles the permit and inspection, and when is the inspection scheduled? The answer should be “we do” and “as soon as the install is complete.” Not “you’ll need to call the city.”

The Kingswell Way, which is the operating standard at Westlight, puts all of this in writing. The price before the work. The arrival window we commit to. The clean job site. The written guarantee. And the return visit if anything fails. Those aren’t marketing phrases; they’re the five specific promises every single job is held to, and the schedule commitment is part of that.

What a Written Schedule Commitment Should Look Like

You should leave the quoting conversation with a document that looks something like this, with real dates attached:

1. Measure date: On or before [date], a background-checked technician arrives, measures, and documents window conditions.
2. Quote delivery: Written price delivered by [date], itemized by window opening, product line, and installation type.
3. Order submission: Manufacturer order placed by [date], with confirmation number provided to homeowner.
4. Estimated production window: [Date range] based on current manufacturer lead time at time of order. Updated if the manufacturer revises.
5. Install date: Crew arrives on [date], expected completion in [X] days. Weather contingency noted for Los Angeles rainy season.
6. Permit and inspection: Permit pulled by [date, if required]. Inspection requested upon install completion. City response time currently 2 to 4 weeks.
7. Final walk-through: Homeowner walk-through with crew lead on [date]. Written guarantee handed over at completion.

If a contractor won’t put the schedule in writing, that’s not a preference issue. That’s a red flag. A written schedule is a commitment device, and contractors who resist it are usually protecting their own flexibility, not your project. The 365-Day Done Right Promise at Westlight exists precisely because Los Angeles homeowners have been burned by exactly this kind of vagueness: a price that moved at the door, a crew that disappeared for three weeks, a seal that failed six months later. We put the schedule and the price in writing because we know we’ll be held to them.

Common Mistakes to Avoid

• Signing a quote with no written schedule. A price without dates is a wish, not a plan. If the contractor won’t commit to a written timeline, keep looking.
• Assuming “start in two weeks” means “windows in by month’s end.” Start usually means measure or order, not install. Ask for the install date specifically.
• Ordering in the fall without checking the manufacturer lead time first. October orders for products like PGT impact windows can slip past New Year’s once the holiday backlog hits.
• Ignoring the permit question on full-frame replacements. In Los Angeles, unpermitted window work can come back to haunt you at selling time. A good contractor handles the permit as a matter of course.
• Choosing a contractor based on speed alone. The guy who says “one week, guaranteed” is often the guy who cuts flashing corners. A realistic timeline beats an optimistic one every time.
• Not asking for the manufacturer order confirmation. Without it, you don’t actually know if the order went in. Get the number. Track the shipment.

When to Call a Professional

Window replacement is not a weekend DIY project, and in Los Angeles the stakes are higher than most cities: seismic requirements, strict energy codes, and stucco exteriors that punish sloppy flashing. If you’re seeing fogged glass, failing seals, drafts, or frames that have shifted out of square, a professional measure will tell you whether it’s a simple retrofit or a full-frame replacement with structural implications. Window Replacement in Los Angeles is a trade where experience and precision beat enthusiasm. Door Installation in Los Angeles carries the same weight. Westlight Windows & Doors offers free estimates in Los Angeles, call (903) 354-7134 to schedule yours.

Frequently Asked Questions

The Bottom Line

A window replacement in Los Angeles is a three-to-four-month project where the installation is the shortest part. The manufacturer lead time drives the calendar, the city inspection queue adds time at the end, and the contractors who are honest about both are the ones worth hiring. Get everything in writing: the price, the schedule, the lead time, the permit plan. A good company will hand you that document before you spend a dollar, and stand behind it after the windows go in. Westlight Windows & Doors has been doing exactly that since 2009, carrying eight manufacturer lines including PGT, CGI, Therma-Tru, Mr-Glass, and ViewLux, with live phone coverage 24 hours a day. Call (903) 354-7134 for a free estimate and a real timeline, in writing.

Written by Owen Satterfield, Owner at Westlight Windows & Doors, serving Los Angeles since 2009.