Full Frame vs Insert Window Replacement | Which Is Right for Your BC Home | SilverLine Exteriors

Pull the trim off a window on a 1988 Coquitlam split level and you find out fast which method that house needs. About one in four of the older stucco homes we open up in the Lower Mainland has soft wood at the sill, usually at the bottom corners where thirty years of Metro Vancouver rain has run down the glass and found a gap in the old caulking. On those houses the insert method is off the table before we finish the first window. On the house next door, built the same year with a wider overhang and better flashing, the frames are bone dry and an insert is the smarter, cheaper call.

That is the whole decision in one paragraph. Full frame vs insert window replacement is not a question of which method is better. It is a question of what condition the wall behind your window is in, and what your exterior cladding will let us do without wrecking it.

We manufacture our own vinyl windows in Port Coquitlam, which means we build both retrofit flange units and nail fin units in the same shop. We do not have a product preference pushing the answer one way, which is why we can be blunt about when the cheaper method is the right one.

Quick answer: which one do you need?

Choose insert replacement if your existing frame is square and dry, you are happy with the current window size, and your exterior is stucco or brick that you would rather not cut into.

Choose full frame replacement if there is any rot or water staining at the sill, the opening has racked out of square, you want to change the window size or style, your existing frames are vinyl, or the wall is being re-clad anyway.

Most Lower Mainland houses built before 1995 end up somewhere in between, with a mix of both methods across the same job. That is normal and we quote it that way.

A note on terminology in BC

American manufacturers call the first method an insert or a pocket window. In BC the trade word is retrofit, and it means the same thing. If a Vancouver contractor quotes you “retrofit windows” and another quotes “insert replacement,” they are describing the same install. We wrote a longer breakdown of the method in our comprehensive guide to retrofit windows.

The confusion matters because it changes what you are comparing on two quotes. Ask each contractor which method they priced. We have seen homeowners take a bid that looked $6,000 cheaper without realizing one company quoted retrofit and the other quoted full tear-out.

What insert (retrofit) window replacement is

The old sash, glass, and hardware come out. The original frame stays in the wall. A new window, built slightly smaller with a flange that laps over the existing frame, slides into the pocket, gets screwed to the old frame, then gets insulated and sealed.

Nothing outside the window opening gets touched. Your stucco stays intact. Your interior casing usually stays intact too, though we often replace the interior stops for a cleaner finish.

The trade-off is glass area. The new frame sits inside the old one, so you lose roughly one inch to one and a half inches per side on a typical 1980s aluminum window. On a small bathroom window that is barely noticeable. On a large living room slider facing a view you will notice it, and we tell people so before they sign.

When insert replacement is the right call

• The existing frame is wood or aluminum, still square, and dry at all four corners
• Your exterior is stucco, brick, or stone that would be expensive or impossible to patch invisibly
• You want the job done fast with minimal mess inside the house
• You are keeping the same size and operating style
• The building is a strata and the depreciation report calls for like-for-like replacement

What full frame window replacement is

Everything comes out. Sash, glass, frame, interior casing, and exterior trim, right back to the rough opening in the framing. We inspect the sheathing and the sill, repair anything that has gone soft, install new flashing and a sill pan, then set a new window and rebuild the trim and any siding we had to remove.

This is the method that lets us actually fix a problem instead of covering it. If water has been getting past your window for a decade, an insert traps that damage behind a brand new unit. Full frame is the only way to see it.

It also gives you the full original opening back. If your 1990s aluminum window was already smaller than the framed opening, a full frame replacement can gain you glass instead of losing it.

When full frame is the right call

• Any soft wood, dark staining, or mould smell at the sill or jambs
• Existing frames are vinyl, which will not carry an insert properly
• The opening has settled and is more than about a quarter inch out of square
• You want a different size, a different style, or a window turned into a door
• The siding is coming off anyway for a re-clad or a rainscreen upgrade
• The house is from the leaky condo era and has a documented envelope history

Side by side comparison

Real numbers for the Lower Mainland

Our average installed price for a double glazed vinyl window in Metro Vancouver runs $800 to $1,000 with the retrofit method. Triple glazed lands between $1,000 and $1,400. Those are supply and install, taxes out.

Full frame on the same window typically adds $300 to $800 depending on the cladding. A wood-sided rancher in Port Moody is at the low end because the siding comes off and goes back on in an hour. A stucco house in Vancouver’s Dunbar area is at the high end because we are cutting stucco, installing new flashing, and then coordinating a stucco patch that will never colour match perfectly on a wall that has been weathering since 1991.

Rot repair is separate and we cannot quote it before we open the wall. Budget $200 to $600 per affected window for sill and sheathing repair. On the rare bad one, where water has run down inside the wall and taken out the framing below, it goes higher. We show you the damage and price the repair before we proceed. Nobody likes that phone call, but finding it now is cheaper than finding it in five years.

Full pricing across every window type is broken down on our Vancouver window replacement cost page.

Why this decision is different in Metro Vancouver

Two regional factors change the math here, and the first is rain. We get somewhere around 1,200 to 1,600 mm a year depending on where you are between Richmond and Coquitlam, and most of it falls sideways between October and March. Wind-driven rain is what kills window sills. A house in Calgary with the same window from the same year is usually dry at the sill because the water never sat there. Ours are not.

The second is the building stock. Between roughly 1985 and 2000 the Lower Mainland built an enormous number of face-sealed stucco homes with no drainage cavity behind the cladding. When those walls leak, the water has nowhere to go. That period produced the leaky condo crisis, and the same construction went into thousands of single family houses that never made the news. If your home is from that window and still has original cladding, we go in expecting to find moisture, and we quote full frame on the elevations that face the weather. Our explainer on what a rain screen is covers why the drainage cavity matters.

Newer homes are a different story. Anything built in Metro Vancouver after the 1998 rainscreen requirements came in has a drainage cavity, a properly lapped weather barrier, and usually a sill pan. Those windows come out clean and an insert is often perfectly appropriate.

Your cladding decides more than you think

Stucco is the big one. Cutting stucco to do a full frame replacement means a patch, and a patch on a 30-year-old wall is visible no matter how good the stucco guy is. Colour and texture both drift with age. This is why so many Vancouver homes get retrofit windows even when full frame would be technically better: the homeowner does not want a ring of fresh stucco around every window. That is a legitimate reason to choose insert, as long as the frames test dry.

Vinyl siding is the easy one. Panels unclip, the J-trim comes off, we do the work, and it all goes back. Full frame on a vinyl-clad house adds very little to the labour.

Hardie and other fibre cement sits in the middle. It comes off cleanly if it was installed with a proper reveal, but individual planks crack when they are pried and matching an older colour can be a hunt. Brick is the hardest. Full frame in a brick opening means working around a structural lintel and we look at each one individually.

The vinyl frame problem

If your existing windows are vinyl, you are almost certainly getting full frame, and homeowners are often surprised by this.

Vinyl frames are hollow chambered extrusions. They were designed to hold glass, not to carry a second window fastened into them. There is not enough solid material to anchor an insert securely, and the fastener locations you would need are usually the same chambers that carry the drainage weep path. Block those and you have built a water trap.

Older vinyl also gets brittle. A twenty-year-old white vinyl frame on a south-facing wall in Surrey has taken a lot of UV, and it will crack when you try to fasten into it. We manufacture vinyl windows and we still tell people the same thing: vinyl frames come out, they do not get filled.

Strata buildings

Strata window projects follow their own logic. Windows are almost always common property in BC, so the decision is the strata council’s, not the individual owner’s, and it flows from the depreciation report and the engineer’s scope.

Occupied buildings usually favour retrofit because units stay livable, there is no interior demolition, and the schedule is predictable across dozens of suites. Where a building is doing a full envelope remediation with the cladding already off, full frame is the obvious choice and costs very little extra because the wall is already open.

If your report flags windows and you are trying to work out scope and sequencing, call us before the AGM rather than after. Scope written without a contractor in the room tends to need rewriting.

Permits in the Lower Mainland

Like-for-like retrofit replacement generally does not need a building permit anywhere in Metro Vancouver. Changing the size of an opening, adding a new opening, or converting a window to a door does, because you are altering structure and possibly egress.

Requirements vary by municipality and they do change. Coquitlam, Burnaby, and the City of Vancouver each handle it a little differently, and Vancouver in particular is stricter about anything touching the building envelope. We pull permits as part of the job when the scope requires one, and we tell you at quote stage if yours will.

Bedroom windows carry a separate obligation. BC Building Code egress minimums apply any time you replace a bedroom window, and a retrofit that shrinks the opening can push a window that used to comply below the threshold. That is one of the few situations where the insert method creates a code problem, and it is why we measure bedroom openings carefully on every quote.

How we decide on your house

Our sales rep does a rough measure and gives you a quote. If you order, we come back for a final measure before anything gets built. That second visit is where the method gets locked in.

At final measure we check each opening for square across both diagonals, probe the sill for soft wood, look for staining on the interior casing and at the drywall corners below the sill, and check whether the existing frame has enough depth to take an insert without crowding the glass. We measure bedroom openings against egress. Then we confirm the method window by window and write it on the production sheet.

Doing it in two passes costs us an extra site visit. It is the reason our orders come out of the shop at the right size and the reason we are not renegotiating scope on install day. Our crews work out of Port Coquitlam, so nothing between Langley and West Vancouver is more than about 45 minutes away and coming back a second time is not a problem.

What to ask before you sign

Ask which method the quote is priced on, window by window. A quote that does not say is not a quote you can compare.

Find out what happens if they open a wall and find rot. There should be a written process and an hourly or unit rate for repair, not a shrug.

On full frame windows, confirm that new flashing and a sill pan are included. Skipping the sill pan is the single most common shortcut we find when we take out somebody else’s ten-year-old install, and we listed the rest in our guide to common window installation mistakes.

Then ask who does the stucco or siding patch. If the window company subs it out and the sub is not scheduled, your house sits open for however long that takes.

FAQ

Is full frame window replacement worth the extra cost in Vancouver?

On a pre-1998 stucco home with any sign of moisture, yes. You are paying a few hundred dollars per window to find and fix damage that otherwise sits behind a new window for the next 25 years. On a dry, square frame in a newer home, no. The insert performs nearly as well and the money is better spent on better glass.

How much glass do I lose with insert window replacement?

Roughly one inch to one and a half inches per side on a typical 1980s aluminum frame, so about two to three inches off both the width and the height. On a 60 by 48 inch living room window that is around a 9 percent reduction in visible glass.

Can I mix both methods on the same house?

Yes, and most of our jobs do. South and west elevations take the weather in Metro Vancouver and often need full frame, while sheltered north-facing windows test dry and get retrofit. We price it that way rather than forcing one method across the whole house.

Does insert replacement still improve energy efficiency?

It does, substantially, if you are coming off single pane or old aluminum. The new sealed unit does the heavy lifting. What it will not fix is air leakage through the original frame or the gap between that frame and the framing, so a house with drafty window surrounds will still be drafty at the edges. Our page on window U-values explains what the performance numbers mean.

Do I need a permit to replace windows in Coquitlam or Vancouver?

Not for like-for-like replacement in the same opening. You do if you change the opening size, add a window, or convert a window to a door. Requirements differ by municipality and we confirm yours at quote stage.

Why do vinyl windows always need full frame replacement?

Hollow vinyl extrusions cannot securely hold fasteners for a second window, and the chambers you would fasten into are usually the drainage weep channels. Blocking those traps water inside the frame. Aged vinyl also cracks under fastening.

How long does each method take?

Retrofit runs 2 to 3 hours per window, so a typical 10 to 12 window house is done in one or two days. Full frame runs half a day to a full day per window depending on cladding and any repairs, so the same house is 3 to 5 days.

Get a straight answer on your house

We have been doing this in the Lower Mainland since 2007, we have 9 HomeStars awards, an A+ BBB rating, and 107 Google reviews averaging 4.5 stars. We manufacture the windows we install, so the recommendation you get is about your wall, not about moving a product.

Book a free quote and we will walk your house, check the frames, and tell you which windows need full frame and which do not. Call 604-942-0488 or request a quote online. You can also see the full range on our window replacement page or read about how we work in Vancouver.