How long does a typical window installation take?

My neighbor had the entire weekend to complete a window replacement for her. She moved the furniture, covered up the floors and even took care of her children for us during the days. By lunch time on Saturday the job was complete and she said she felt a bit misused for the remainder of the weekend.

Most window replacement projects end up being much shorter than anticipated. But there is more to the story than just that.

The short answer (and why it’s not always enough)

A single window takes anywhere from 30 minutes to a couple of hours to install. A full house replacement — say six to ten windows — usually wraps up in one day. Larger jobs with 15 or more windows might stretch into a second day, but rarely a third.

All installation projects can vary from approximately 30 minutes for a single window to several hours and on into days. A full house replacement for a house with 6 to 10 windows are generally completed in one day. However, jobs that include 15 or more windows can sometimes take 2 or 3 days to complete.

We say it takes thirty minutes to a couple of hours to install a single window. However, when it comes to a whole house full of windows (6 to ten) it usually takes one day to complete. Bigger houses with fifteen or more windows can take two days to complete.

Although it is rare for a house with six windows or less to take more than one day to complete a window replacement job, there are many houses with 15 or more windows. Even in these houses, it is typical for the installers to complete most of the work in the first day, and use the second day for finishing up any remaining work. This is because once the initial work has been done to remove the old windows and prepare the surrounding areas for the new ones, most of the subsequent work is relatively straightforward to complete.

What actually affects the timeline

There are several factors, besides the amount of windows you are having replaced, that can affect the time frame of your window replacement project. Sometimes these factors are obvious, and sometimes not until you are actually going through the process of having your windows replaced and wonder why it is taking so long.

• Window type: Standard double-hung replacements move fastest. Bay windows, bow windows, and custom shapes demand more precise framing and finishing work — sometimes significantly more.
• Insert vs. full-frame installation: Insert replacements (where the old frame stays) are quicker. Full-frame removals take longer but are absolutely worth it when the existing frame is compromised.
• Accessibility: Ground-floor windows are straightforward. Second-story or hard-to-reach openings add real setup time, especially if scaffolding enters the picture.
• Interior finish work: Some crews handle interior trim and caulking as part of the job. Others hand that off to you. This affects your total timeline even when it doesn’t affect theirs.

The weather: In extremely cold weather the use of caulk and foam sealants can be unpredictable. In the rain full-frame jobs which require the wall cavity to be exposed may have to be put on hold until the weather improves. As most contractors work all year round they will inform you if they think the weather is going to cause any delay.

What happens on installation day

A more detailed look at a single-story home with 6 windows to be replaced would be as follows:

1. The crew arrives, walks the job, and confirms which windows are going where.
2. They protect your floors and furniture near each opening, usually with drop cloths or cardboard.
3. Old windows come out. This is the loud part.
4. Frames are inspected. Any rot or water damage gets addressed before the new unit goes in.
5. New windows are set, leveled, shimmed, and fastened.
6. Exterior caulking and flashing are applied. Interior trim is reinstalled or replaced.
7. Final walkthrough. You test every window. Ask questions. Don’t skip this step.

Most house with single story homes and 6 windows or less can be completed in four to six hours to complete the work and be done in one day. For this reason, you need to be present throughout the day since there will be times when your installer asks you a question or needs you to make a choice.

A note on regional expectations

It is not uncommon for the calendar of a contractor’s calendar to fill up quickly in some regions. For example, in the mid-Atlantic, all of the windows in a house can be replaced in the fall of the year and there are many homes that are completed in a short amount of time. This can mean that there is little to no wait for window installation in Allentown, PA if you schedule with a contractor before the first cold snap of winter. The best time to schedule would be before the weather turns cold in order to get the best service and have your windows completed in a timely manner.

The mistakes that drag everything out

• Ordering windows before the installer takes measurements. Manufacturer specs and actual rough opening sizes are not the same thing, and discovering that discrepancy mid-job is nobody’s idea of a good afternoon.
• Skipping the pre-installation walkthrough. This is where surprises get discovered on your terms, not mid-job when the wall is already open and the clock is running.
• Assuming all windows in the house are the same size. They’re often not, especially in older homes where “standardization” was apparently considered optional.

But what about a house with lots of windows? Will they all be installed in one day? I wish I could tell you yes. I wish I could promise you a one-day wonder. But I would be lying. The truth is that there is no hard and fast rule for estimating how long it will take to install all of the windows in a house. And that truth can be very frustrating. However, I can promise you that the more questions an installer asks before beginning work in your home, the more likely it is that the job will be completed on time. Also, don’t forget to ask your installer to remove as much as possible from the area surrounding the window(s) to be installed. While it is common for installers to have to move around furniture and to cover floors, it is better for everyone if as much as possible is cleared from the area before they arrive. In the end, it is worth it. There is nothing quite as beautiful and as cozy as a brand new window. Shining brightly, it brings in fresh air and is energy efficient. In contrast, old windows are sashes that rattle and creak with every breeze.