Full frame vs insert window replacement in Ottawa.
Full frame when the existing frame is rotted, out of square, draughty at the perimeter or you want the full glass area back. Insert when the frame is sound, dry and square and you want the lower cost and less disruption. We tell you which at the measure, and the quote says which one it is.
Updated October 2026.
Option one
Full frame replacement.
The old unit comes out down to the rough opening, frame and all. The new window is fastened, shimmed and sealed directly to the house.
Advantages
- We see the framing and fix rot before it is covered again
- A new airtight, insulated seal at the rough opening
- The largest glass area the opening allows
- New interior casing and exterior capping, so the finish matches
Trade-offs
- Costs more, roughly 15 to 25 percent per opening
- More disruption to trim, drywall edges and exterior cladding
- Takes longer per opening
Option two
Insert replacement.
The existing frame stays. The new unit is fitted inside it and sealed to the old frame rather than to the house.
Advantages
- Lower cost per opening
- Interior trim and exterior finish stay as they are
- Quicker, usually a shorter day for a full house
Trade-offs
- Loses some glass area to the old frame
- Any rot or air leak in the old frame stays behind the new unit
- Only right when the old frame is sound, dry and square
Decide
Which is right for your house.
Most homes land clearly in one column. The ones that do not get a straight answer at the measure, not a guess over the phone.
| Your situation | Our recommendation |
|---|---|
| 1950s to 1980s home with solid, dry frames | Insert |
| Rotted sill, soft wood or water stains around the window | Full frame, after finding where the water is coming from |
| Fogged glass but a sound frame | Insert, or a sealed unit swap alone if the frame is fine |
| Draughts at the frame edge, not the sash | Full frame |
| Brick home needing brick to brick work | Full frame, and the quote says so |
| Heritage or character home with original wood windows | Assess repair first. We will say if replacement is not the right call |
Climate
What matters in an Ottawa winter.
Air sealing at the rough opening
Cold air finds the gap between the frame and the house, not the glass. Full frame lets us foam and seal that gap directly. An insert relies on the old frame's seal, which is fine when it is sound and a problem when it is not.
Water management and flashing
Melt and refreeze at the sill is how frames rot. Full frame gives a new sill pan and flashing. An insert keeps the old drainage path, so it only makes sense when that path still works.
Glass area and appearance
An insert sits inside the old frame, so the glass gets smaller by the width of that frame. In a small room facing north, that is light you notice in January. Full frame gives the full opening back.
Natural Resources Canada says the same thing in plainer words: an insert should only be done where the existing frame has not deteriorated and is properly sealed and insulated, and a full tear out is what lets the installer make an airtight, insulated seal to the rough opening. Their guidance is in Keeping the Heat In, section 8.
Before you sign
What your quote should say.
If any of these is missing, ask. Ours has all of them, per opening.
- Insert or full frame, stated for each opening, not for the house
- What happens if rot is found once the old unit is out, and who decides
- Whether interior casing and exterior capping are included and finished
- Removal and disposal of the old units
- The cost difference between the two, so you can see what you are paying for. Our tiers are on the pricing page, where full frame runs roughly 15 to 25 percent more
Questions
Full frame and insert questions, answered.
Can I mix insert and full frame in one house?
Yes, and it is common. Each opening is quoted on its own, so a rotted sill on the north side gets full frame while the sound frames on the south side get inserts, and the quote shows which is which.
How do you know the frame is sound without taking it out?
We probe the sill and the lower corners at the measure, check for staining and softness, and check the frame for square. If we are not sure, we say so and price it as full frame, because finding rot on install day with an insert on the truck is the bad outcome.
Does an insert void the manufacturer warranty?
No, the manufacturer warranty covers the window itself either way. How it was installed is OpenPane's 20 year workmanship warranty, which also applies to both. What each covers is on the warranty page.
We tell you which one at the measure.
A free quote at your house, each opening priced on its own, with insert or full frame written against every one.