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Replacement Window Installation Options
Let's explore the difference between new construction vs replacement windows. In terms of the windows themselves, there is very little difference between the two. In terms of the actual installation, there is QUITE a bit of difference. We will break down both parts of this equation and let you know what you can expect to pay for each of these installation techniques.
Article By Tommy - Site Editor - Publish Date: December 11, 2013
Last Update: October 31, 2025
Page Section Links
- Introduction
- Basics Behind New Construction vs Replacement Windows
- Replacement Window Installation
- New Construction Installation
- What Are The Costs
- New Construction vs Replacement Windows Reviews
New Construction vs Replacement Windows
As far as the actual windows themselves, the only real difference between new construction vs replacement windows is that with new construction, there is a nailing fin or nailing flange attached. This fits around the top and sides of the frame and allows the window to be securely installed to the rough opening (wood frame). This nailing fin costs money, but it is nominal.
Replacement windows (also called insert or pocket windows) are not sold with the nailing flange because they are placed directly inside the existing opening of the old window (therefore they don't require the nailing fin). Some manufacturers sell replacement windows with an optional "new construction" configuration.
Replacement Window Installation
When it comes to installation, there are huge differences between new construction vs replacement windows. Let's start with the easiest of the two methods. With replacement windows (or pocket or insert installation), the old window is literally cut out of the wall and tossed out. The edges of the "hole in the wall" are smoothed to make a clean surface and then the replacement window is inserted.
The installer might shim the window to make sure it is square and plumb. They then secure the new insert using predrilled screw holes in the frame of the replacement window. Next, the installer seals and caulks the replacement window, both inside and out. Lastly, they do whatever finish work to make the new pocket window look nice and clean. Voila! Job done.
New Construction Installation
New construction involves some additional steps. While replacement windows are cut out of the opening, new construction windows
***********write in the steps here.
First off, new construction typically requires attaching the window via the nailing flange to the wall, along with sealing and caulking.
Housewrap or flashing is used to provide a moisutre barrier and a bottom sill pan should be used to create a way for the water to escape away from the house if it should get into the opening many years down the road. Any exterior and interior trim work also needs to be done to make the window look attractive.
New Construction vs Replacement Windows Cost
Certainly, these very distinct methods of installation carry different price tags. Simply put, new construction window installation is more expensive than standard or pocket replacement. There are some overall price guidelines for a normal sized window.
New Construction Costs
$250 - $450 per window
Standard Replacement Costs
$100 - $150 per window
Pocket Inserts
$50 - $75 per window
Below is our homeowner reviews section where we have posted actual consumer reviews on the subject. If you'd like to get additional information on your installation questions, ask me and I'll make sure to get back to you.
Tom - HWRC Editor
Importance Of Installation
Hi Tom, I was mistaken, the HD product is Simonton 6500 windows. Thoughts on them? I don’t think we’d hang on to the house if my mom passes. That being said, we had new replacement windows installed for her just 15 years ago. It was a small independent window guy and I could tell his installers didn’t do a good job. They left no room for window treatments, hardly used any insulation, and the windows started fogging up within 5 years. Thank you for the suggestion on Midway Windows. I’ll be calling them shortly. Please let me know your thoughts on Simonton 6500. Many Thanks!
Katie - Homeowner - from 2025
Editor Reply
Katie, I like the Simonton 6500 - it's about on par with the Wincore 7700 series. Couple with professional installation, these windows should serve you well until you are ready to sell the home. Windows are 50% / installation is 50% - so choose the installers wisely.
Tom - Site Editor - from 2025
Retrofit Windows
Thank you so much for all of your help! Is a nail fin is better than retrofit? Thanks, you seem to be the only way to get good info for all of the sharks!
Bob - Homeowner - from 2017
Editor's Reply
Bob, there is no clear winner in the retro/new construction question. There are pros and cons to both. Retro is often cheaper, but you lose some glass area and there can be some moisture issues, depending on you walls etc. New construction is more expensive, saves some glass area, and possibly offers better protection against moisture in walls.
This is where a bunch of bids helps you out. The installers/companies basically provide free opinions on which they think you need, costs, process, etc. Keep getting them until you feel like you know the real answer for your project!
Tom - HWRC Editor - from 2017
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