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How-To
Insert vs. Full Frame Window Replacement: Benefits, Limitations & Costs Comparison
Your guide to understanding the difference between insert and full frame window replacement solutions.
When it’s time to replace your windows, you’ll be presented with many choices. In addition to size, shape, aesthetics, and how the window functions, you’ll have the option to choose between insert replacement and full frame replacement. When you’re unfamiliar with window and door terminology — or like many, are replacing windows for the first time — these terms can be confusing. We’re here to demystify the process and to explain what you’ll need to know to choose the right window replacement solution for your home.
What is Insert Window Replacement?
The quick explanation: Insert window replacement is when new windows are installed within the existing frame. Only the old sash, hardware, and covers are removed and replaced.
Benefit: Less extensive installation and typically lower cost; preserves existing interior and exterior trim.
Limitation: Only an option if you have structurally sound frames — and you may see a slight reduction of light opening.
Can You Replace Windows Without Replacing the Frame?
When you choose insert window replacement, new windows are installed within the existing window frame. Also known as “frame-in-frame replacement” or a “pocket window,” it’s an option when your existing window frames are structurally sound and you want to preserve existing interior and exterior trim. The existing sash, operating hardware, and covers are removed and the new window unit is inserted into the old frame where it is anchored, insulated, and sealed.
Because existing trim and siding are not disturbed, this is generally a quicker installation and typically a lower cost replacement solution. An insert window is a great option when you’re happy with the size, shape, and operating style of your existing window.
Even relatively new vinyl windows — less than 10 years old — can suffer from seal failures and degradation from exposure to the elements and may need to be replaced. Note that insert replacement is usually not an option when replacing vinyl windows since the vinyl frames commonly lack the structure to support a quality and long-lasting replacement solution.
How Long Does Insert Window Replacement Take?
A professional crew can typically complete several insert replacements in a single day since the process is less invasive and labor intensive than a full frame replacement solution. Your dealer and installers will be able to provide you with a timing estimate at the beginning of your project.
What is Full Frame Window Replacement?
The quick explanation: Full frame window replacement is when existing windows are completely removed down to the studs and the new window is installed in the opening.
Benefit: Allows a professional to inspect for and repair water damage; offers flexibility to replace with a new style or size window.
Limitation: More extensive installation and typically higher cost; requires removal of interior and exterior trim, and occasionally siding.
How to Install Full Frame Replacement Windows
When you choose full frame window replacement, existing windows or doors are completely removed down to the studs, along with interior and exterior trim — and occasionally some siding — and the new window is installed in the opening. By exposing the original opening, full frame replacement allows for inspection and repair — if necessary — of areas with rotting wood or water damage where the existing window’s failure has allowed weather into the home’s structure.
Full frame replacement is a more extensive installation process and typically carries a higher price point, but it also offers the flexibility of replacing with a new style or size window. Consider replacing a hard to reach double hung window with an easy-to-open awning window over the sink. You can add a door where there was a window, or extend your view and let more light into a room by bringing the window sill closer to the floor or your kitchen counter. Changing the size can affect the price, but working within the height and width of the existing opening can help to limit additional expense.
Full frame replacement is usually necessary when you have vinyl frames, your frames have sustained damage over the years, or you are remodeling your home.
How Long Does Full Frame Window Replacement Take?
The pace of a full frame replacement project is quite varied. Factors like repairs or changing the size and shape of the window will add time and labor to the install time of each unit, as will the additional tear-out and finishing work involved. Your dealer, contractor, and installers will be able to provide you with a timeline at the beginning of your job.
Insert vs. Full Frame: Side-by-Side Cost Comparison
As you’d guess, insert window replacement is generally the more inexpensive option given the less invasive nature of the installation and materials involved. But full frame may be worth the additional expense if you’re hoping to make design or style changes to your home or if you’re needing to repair or mitigate issues with your existing windows, doors, or structure.
Looking for more guidance?
A window and door dealer can help you evaluate the needs of your home and choose the most cost-effective solution for window and door replacement. Find dealers by zip code using our dealer locator.
FAQs
How do you know if your window frames are structurally sound? This determination is best made by a window expert, like a dealer representative or contractor, but if you’ve noticed issues like soft spots, visible rot, moisture damage, or paint peeling around your windows, you most likely have some sort of issue with your window or its surrounding structure. A dealer or contractor will be able to get you the definitive answer and help plan for next steps.
Can I do a partial window replacement, or does it have to be all-or-nothing? You don't have to replace all your windows at once or use the same method throughout your home. Different windows in the same home can have different needs — some may be best served by an insert replacement, while others might require full frame.
Will insert replacement affect my home's energy efficiency? Done correctly, insert replacement can meaningfully improve energy efficiency, especially if you're upgrading from older single-pane windows. However, because the original frame remains, any pre-existing air leaks in that frame may persist. Your installers may be able to help mitigate this during the project, but check with your contractor to know for sure.
Does window replacement require a permit? Permit requirements vary by municipality. Full frame replacement — which involves structural changes — is more likely to require one than insert replacement. Your dealer or contractor can advise on local requirements.
What time of year is best for window replacement? Window replacement can be done year-round, though spring and fall tend to be ideal. Extreme cold can affect sealants and installation materials, while summer heat can also affect sealants as well as make the work more demanding.
Will new windows increase my home's resale value? Window replacement is generally considered a strong home improvement investment. Full frame replacement, in particular, can be appealing to buyers because it signals that the home's window-adjacent structure has been inspected and, as part of the installation, updated.