Quick answer: An insert (pocket) replacement window fits inside your existing window frame, so trim and siding stay untouched. A full-frame replacement removes the old window down to the rough opening, so the installer can inspect, repair and re-flash the opening. Use inserts when the existing frames are square and solid. Use full-frame when there is rot, water damage, or you are replacing siding at the same time.
Insert Replacement Windows
The new window slides into the existing frame after the old sashes and stops are removed. It is faster, less disruptive and costs less. The tradeoff is a slightly smaller glass area, and you are trusting that the old frame and flashing are in good shape.
- Best when frames are square, dry and solid.
- Interior and exterior trim usually stay in place.
- Faster install with less wall disturbance.
Full-Frame Replacement Windows
The entire old window, including the frame, comes out. The installer sees the rough opening, repairs any rotted framing or sheathing, installs new flashing and sill pan, and sets a new window with new trim.
- Best when frames are rotted, out of square or leaking.
- Best when you are replacing siding at the same time.
- Lets you change window size or style.
- Restores full glass area.
How We Decide, Opening by Opening
We do not pick one method for the whole house. We check each window for soft wood, water stains, gaps, and whether it opens and locks squarely. Many homes end up with a mix: inserts where frames are sound, full-frame where they are not.
Installation Details That Matter in Colorado
- Flashing and a sloped sill pan so wind-driven rain drains out, not in.
- Low-expansion foam and sealant to stop drafts without bowing the frame.
- Glass suited to high-altitude sun, such as low-E coatings.
- Exterior trim sealed where it meets siding.
See our full window replacement in Longmont services, and read our window replacement cost guide and energy-efficient window guide.
Frequently Asked Questions
Is full-frame window replacement worth it?
It is worth it when frames are rotted or leaking, or when you are replacing siding. If frames are sound, insert windows are a good value.
Do insert windows reduce glass size?
Slightly, because the new frame sits inside the old one. Full-frame keeps the full glass area.
Can hail-damaged windows be replaced through insurance?
Often, if the damage is from a covered storm. We document the damage and meet your adjuster. Your deductible is still yours to pay under Colorado law.
How long does window replacement take?
Insert windows go in faster than full-frame. We give you a schedule with the written estimate.
Get a Free Window Estimate
Josh Brooks Construction and Renovation Inc. is a licensed general contractor in Longmont with 30 years in construction, serving 46+ Front Range cities. We check every opening and recommend insert or full-frame based on what we find. Call 720-828-7997 or text 720-453-5095.
Licensed. Local. Not a storm chaser.
