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

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

In 2024, custom window lead times from brands like Andersen 400 Series and Milgard Tuscany run 6 to 12 weeks from order to delivery in Southern California. That means a “fast” installer who can start next week is almost certainly quoting you stock-size windows, not custom-fitted ones. This guide breaks down the real timeline for Window Replacement services in Los Angeles: what happens week by week, how long installation day actually lasts, and what causes delays that nobody warns you about. You’ll learn the questions to ask before signing anything, so you’re not blindsided when week 10 rolls around and your windows still haven’t shipped.

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Quick Answer

Window replacement in Los Angeles typically takes 2 to 3 months from your first phone call to a finished room, but the actual installation day is usually just 1 to 3 days. The long part is ordering: custom windows take 6 to 12 weeks to fabricate and ship. If someone promises a full replacement in under two weeks, they’re installing stock sizes, which often means new trim, patched stucco, or gaps filled with caulk instead of a true fit.

Table of Contents

• Why There Are Two Different Timelines (and Why It Matters)
• The Week-by-Week Project Timeline
• How Long Installation Day Takes, Window by Window
• What Actually Causes Timeline Blowouts
• Protecting Your Home During the Window-Less Window
• Questions That Expose an Unrealistic Timeline
• Common Mistakes to Avoid
• Frequently Asked Questions

Why There Are Two Different Timelines (and Why It Matters)

Most homeowners ask “how long does window replacement take” and get an answer about installation day. But there are really two separate clocks running. The first clock covers the entire project: from your first call, through measuring, ordering, fabrication, permits, and scheduling. The second clock covers just the physical work: removing old windows and setting new ones. Conflating the two is why so many people in Los Angeles are shocked when a contractor says they can “start next week” but the windows won’t arrive until February.

In our experience working across the Los Angeles market, the biggest misunderstanding is about what “replacement” means. True replacement windows are built to the exact opening dimensions of your home, measured to an eighth of an inch. They don’t sit on a shelf. A factory in Florida or Texas or Pennsylvania builds them after you order. That process, plus freight to Southern California, simply takes time.

Stock windows, by contrast, come in standard sizes like 36 x 48 inches. If your rough opening is 35.5 inches wide, the installer either pads the gap with shims and trim or widens the opening and patches the stucco. Neither is wrong when done properly, but it’s a different scope of work with a different timeline. Knowing which one you’re being quoted is the first step to an honest schedule.

Hale Windows & Doors carries professional-grade lines including Mr-Glass, Therma-Tru, ViewLux, and PGT. Each brand has its own factory lead time, which we explain before you commit, so the timeline is never a surprise later.

The Week-by-Week Project Timeline

Here’s what a typical full-house window replacement in Los Angeles looks like from start to finish, assuming custom windows and no major surprises.

1. Week 1: First call and in-home measure. A technician comes to your home, measures every opening, checks for square, inspects the frames for rot or termite damage, and discusses product options. This visit takes 60 to 90 minutes. You’ll get a written price, not a verbal estimate.
2. Week 1 to 2: Permit application. In the city of Los Angeles, window replacement generally requires a permit through LADBS. The typical turnaround for a window permit is 1 to 3 weeks, though it varies by district office. We handle the paperwork and don’t begin work until the permit is pulled.
3. Week 2: Order placement. Once you approve the quote and the deposit is processed, your windows go into the factory queue. This is the longest single step.
4. Week 2 to 10: Fabrication and shipping. Custom windows from brands like PGT or Therma-Tru take 6 to 12 weeks from order to delivery, depending on the line, glass package, and time of year. We’ll give you a current lead time based on our most recent orders from the factory, not last year’s numbers.
5. Week 10 to 12: Install scheduling. The week your windows arrive at our warehouse, we call to schedule your installation. For a full house, we typically block 2 to 3 consecutive days.
6. Install day(s): The work itself. A two-person crew can replace 5 to 8 windows per day on average. A 15-window house usually takes two full days plus a half day for trim-out and cleanup.
7. Post-install: Permit sign-off. For projects that required permits, a city inspector checks the work. Most sign-offs happen within a week of the final day.

This timeline is why the question “when can you start” matters less than “when will the windows be installed and the permit closed.” A company that starts tomorrow with stock windows might finish after the custom order you placed three weeks ago.

How Long Installation Day Takes, Window by Window

Not all windows take the same amount of time to install. The window type, the condition of the rough opening, and whether stucco or siding needs to be cut all affect the clock. Here are realistic hour ranges for a two-person crew:

• Slider windows: 45 to 90 minutes per window. Sliders have fewer moving parts than casements, and the tracks seat quickly. If the old aluminum frame comes out cleanly, it’s one of the faster swaps.
• Casement windows: 90 minutes to 2 hours per window. The crank mechanism and multi-point locking hardware require precise alignment. Rushing a casement leads to a window that doesn’t seal or a crank that binds.
• Picture windows (fixed, non-operating): 1 to 2 hours per window. The glass unit is heavy and often requires a third person or a suction rig. The real time goes into shimming and insulating so the framing isn’t stressed.
• Bay and bow windows: 4 to 8 hours per window unit. These are structural installations, not simple replacements. The projecting unit needs a new support system, roof flashing, and sometimes interior and exterior finish work. Plan for a bay window to consume most of a day.

Our teams in Los Angeles plan the day around the slowest unit. You don’t want a crew rushing a bay window at 5 p.m. because they committed to finishing a full house by dinner. Ask any installer how many of each window type is on your job order and how many crew members will be assigned. A two-person crew doing 12 sliders is reasonable. A two-person crew doing 12 sliders plus two bays in one day is a red flag.

What Actually Causes Timeline Blowouts

Most delays are predictable, yet few contractors mention them upfront. These are the four we see most often in Los Angeles homes.

1. Permit delays at LADBS

Los Angeles Department of Building and Safety processes hundreds of permits a day. A simple window replacement permit can fly through in a week or sit for three weeks depending on filing errors, missing signatures, or district staffing. We’ve had jobs where the permit was ready before the windows and jobs where it added two weeks to the schedule. The key is filing correctly the first time, so the permit doesn’t bounce back.

2. Custom-size ordering errors

A wrong measurement means a window that doesn’t fit. The factory won’t take a return on a custom size, and you’re not paying for the mistake twice, so the bad unit gets reordered. That’s another 6 to 10 weeks. It’s rare with careful measuring, but it’s catastrophic when it happens. Ask how the installer double-checks measurements before the order is released to the factory. If the answer is “we measure once and trust the numbers,” keep looking.

3. Stucco repair around the opening

Most Los Angeles homes are stucco. Removing an old window often chips or cracks the surrounding stucco, especially with aluminum frames that were set decades ago. Patching stucco is a two-step process: the base coat needs to cure before the finish coat goes on, and matching texture takes time. That can add a day or two to the job, and the patch needs several days to cure fully before painting.

4. Hidden rot discovered on removal

Pull out an old window and you sometimes find the rough opening is rotted. Water intrusion around poorly flashed windows rots the framing slowly and invisibly. Once it’s exposed, the rotten wood needs to be cut out, replaced, and dried before the new window is set. This is not optional. A new window over rotten framing fails within a few years. We tell homeowners to expect the possibility, especially in older homes near the coast or in the canyons where damp air and older construction are common.

Protecting Your Home During the Window-Less Window

Sometimes a window removal leaves a rough opening exposed overnight. This happens on larger jobs when the crew can’t finish in one day. A responsible installer handles this with several specific steps.

• Temporary plywood or OSB sheathing: The opening gets covered with a fitted sheet, screwed into the framing every 8 to 10 inches, so it can’t be pushed in from outside.
• Heavy-duty plastic sheeting: The interior side gets sealed with 6-mil plastic, overlapped at the edges and taped at the seams to keep out moisture and dust.
• Weather check: Los Angeles rain is rare but it does come, and coastal dew is nightly. An unsealed opening draws moisture into the wall cavity. The cover needs a slight downward slope so any water sheds outward.
• Security check: A covered window opening is not a secure window. The plywood should be thick enough to deter casual entry, and the crew should verify the covering is still intact if they’re returning the next morning.

Ask upfront what the installer does if a job runs long. If they don’t have an answer, they haven’t thought about your home’s safety the way they should have. The Threshold Standard at Hale Windows & Doors means every technician is background-checked, identity-verified, photo-badged, and pre-announced by name and photo before they arrive. You’ll know exactly who is walking up to the door, and you’ll know what they’re supposed to do when they open a wall of your house.

Questions That Expose an Unrealistic Timeline

Before you sign a window replacement contract in Los Angeles, ask these five questions. A real installer answers all of them in plain terms. A salesperson stumbles.

1. “What is the current lead time from the factory for my exact window line?” If they can’t name the lead time for the specific brand and series they’re quoting, they’re guessing. Mr-Glass lead times are not the same as ViewLux lead times. The honest answer changes with the order volume at the factory, and we update our numbers weekly.
2. “Are these stock sizes or custom-built to my openings?” A stock-size quote can start sooner but usually means gaps, trim-outs, or stucco work that a custom window wouldn’t need. Both are legitimate, but the timeline difference is significant.
3. “How long does the permit take at LADBS, and who files it?” If the answer is “we don’t need a permit,” check with the city. In Los Angeles, you generally do. A contractor who skips permits is either cutting corners or leaving the liability with you.
4. “What happens if the order comes in wrong?” The answer should be “we re-order it and you don’t pay for the mistake.” The follow-up question is “how will that affect my schedule?” Ask for the answer in writing.
5. “How many installers will be on site, and how many days do you expect?” A single installer replacing full-house windows is a recipe for a two-week project. Two-person crews are standard for safety and efficiency, and the day count should match the window type math we covered above.

Common Mistakes to Avoid

• Signing without a written price before work begins. A verbal estimate changes after the old windows come out. A written price locks the number, and that’s the policy at Hale Windows & Doors on every job, no exceptions.
• Choosing based on “fastest start date.” Starting with stock windows in October and finishing in December is no faster than ordering custom windows the same week. The finish line is the same, but the custom fit is better.
• Ignoring the permit question. Unpermitted window work can surface at resale, and in Los Angeles the buyer’s inspector will likely find it. Then you’re paying for permits and possibly corrections years later.
• Not asking about warranty length and what happens if the repair fails. A written guarantee should state the exact terms: what’s covered, for how long, and what happens if it doesn’t hold. Our 365-Day Done Right Promise is specific: if it’s not done right, we make it right, no argument needed.
• Accepting a vague “we’ll call you when the windows arrive” schedule. Demand a call the week the windows ship from the factory and another call to set the install date. You should never have to chase the company.
• Choosing the lowest bid without comparing scope. A quote for stock sliders and a quote for custom casements are not the same job. If one is thousands lower, ask what exactly you’re not getting.
• Not asking who will actually show up at the door. In Los Angeles, homeowners open the door to strangers every day. You have the right to know the technician’s name and see a photo before they arrive. We send both, along with verification that they’re background-checked and identity-verified.

When to Call a Professional

Window replacement is not a Saturday project. The work involves glass handling, structural openings, flashing, and sealing that must be right the first time, and the permit alone disqualifies most DIY attempts in Los Angeles. Call a professional if you’re replacing more than one window, if the window is above the first floor, if the rough opening shows any sign of rot, or if you’re switching frame materials (aluminum to vinyl, wood to fiberglass). Getting it wrong means water intrusion, failed seals, or a window that doesn’t open in August. With us, the price is in writing before the first cut is made, and every job is backed by the 365-Day Done Right Promise. Hale Windows & Doors offers free estimates in Los Angeles, along with window replacement, window repair, and front door replacement – call (252) 675-6980.

Frequently Asked Questions

The Bottom Line

Window replacement in Los Angeles is a two-timeline project: a 6 to 12 week wait for custom windows to be built and shipped, then 1 to 3 days of installation. Honest installers tell you the factory lead time, pull the permit, plan for hidden damage, and protect your home overnight if the job runs long. The fastest start date is not the same as the earliest finish, and stock-size windows can create more work than they save. Get the price in writing, ask who’s coming to your door, and choose a company that puts the guarantee in plain words. Visit Hale Windows & Doors home for more on what to expect.

Written by Spencer Odell, Owner at Hale Windows & Doors, serving Los Angeles since 2009. Explore more guides & resources on windows and doors.