Most windows contractors will ask this when it comes time to replace your windows – retrofit or full frame? The answer will impact your cost, time, disruption, and results. However, until one is already in the middle of a quote, most homeowners would not know the difference.
Whether you’re in the middle of a conversation with a contractor or just thinking about hiring one, you’ll have a clear view of both methods and know which one best suits you.
What Is Retrofit Window Replacement?
Retrofit window replacement (also known as pocket window replacement or insert window replacement) is a method that only replaces the window sash and glass panel, leaving the original window frame, interior trim and exterior casing in place.
The new window unit is inserted into the original window opening. No drywall work. No exterior cladding to be removed. No painting of adjacent trim.
It is the most common window replacement option in Canada for dwellings with well-built frame and no structural damage or rot.
How Retrofit Installation Works
- Existing sash, hardware and glass are taken off
- Original frame is examined, cleaned and leveled as required
- A window unit is installed into the existing frame opening and is pre-measured for size
- The unit is completely sealed, insulated and secured
- Interior/exterior trim is left untouched
A typical installation of all the windows takes 1-2 hours per window for a competent installer.
What Is Full Frame Window Replacement?
Full frame window replacement (also called full tear- out) is the complete removal of the frame, sash, interior trim, exterior casing and often the surrounding drywall or stucco. The opening in the window is reworked to the rough framing of the house.
A completely new window unit (frame and all) is installed without any stacking onto the existing unit. The finishing on the inside and outside is done next.
This is a more intrusive, more costly and longer process but under the right conditions it’s the only proper method.
How Full Frame Installation Works
- All old window elements are removed to rough opening
- The roughout is checked and patched, if necessary
- A new full frame window unit is set, levelled and secured
- Exterior cladding is replaced (brick mould, capping or siding)
- All interior trim, paint and drywall are finished
A full frame replacement will usually take a few hours per window, depending on the time spent on interior/exterior finishes.
Retrofit vs Full Frame: The Core Differences
| Factor | Retrofit (Insert) | Full Frame (Tear-Out) |
|---|---|---|
| What’s Removed | Sash and glass only | All items – frame, trim, casing |
| Installation Time | 1-2 hours per window | 3-5 hours + finishing |
| Cost per Window | $300-$700 (installed) | $700-$1,800+ (installed) |
| Interior Disruption | Minimal | Significant |
| Exterior Disruption | Minimal | Moderate to significant |
| Frame Condition Required | Must be solid, dry and free of rot | Any condition |
| Visible Glass Area | Slightly reduced | Full-size maintained |
| Addresses Structural Issues | No | Yes |
| Best for | Well-maintained older homes | Renovations, new construction, damaged frames |
Retrofit Window Replacement: Pros and Cons
Advantages
- Lower Cost
Retrofit installations are a lot cheaper as the labour is much easier and there’s no need to finish work. The savings to the full frame replacement may be as much as $3,000-$8,000 for 8-12 windows, which is a significant savings to most homeowners for a whole house replacement.
- Faster Installation
A complete home retrofit can sometimes take as little time as one day. No waiting for drywall, paint to dry or for exterior capping to be reinstalled. Minimal scheduling complexity.
- No Interior Finishing Required
You won’t be doing any painting or drywall work. This is a significant benefit to homeowners with custom millwork, interior heritage details, and newly-updated home interiors that they do not wish to disturb.
- Less Mess and Disruption
No dust, debris or construction mess throughout the home. Retrofit is especially useful in existing homes, for rent or in existing buildings where disruption cannot be avoided.
- Suitable for Most Canadian Homes
For most homes constructed from 1970-2005 the frame is still structurally sound for retrofit, standard window upgrades will proceed with this as the default.
Disadvantages
- Slightly Reduced Glass Area
The new unit is installed within the existing frame which results in a slightly smaller glass opening (usually 1-2 inches smaller on each side). This is often not observed, but in certain rooms with low lighting levels, it can make a difference.
- Doesn’t Fix Underlying Frame Problems
If there is moisture intrusion, rot, or structural damage in the existing frame, retrofit just addresses the issue. A failed frame will eventually cause the new insert to fail too – making full frame the only viable option.
- Limited to Existing Opening Size
Retrofit cannot increase the window opening size. Full frame is necessary if you wish to make a window larger (for light, to enhance a view, or to alter its style).
- Frame Lifespan Dependency
If your window frame is also near the end of its life, you’ll continue to get years of use from your new window insert. In those situations a retrofit will only be a short term solution as you may have to do a full job in 10 years anyway.
Full Frame Window Replacement: Pros and Cons
Advantages
- Addresses Root Causes
During full frame replacement, the rough opening is exposed for a contractor to check for water damage, rot, mold, gaps in the insulation or structural problems that would not be visible during a retrofit.
- Maximum Glass Area
A new frame spans all the rough openings. There’s no reduction in visible glass – giving you the full potential of the window opening for light and views.
- Unlimited Design Flexibility
Full frame lets you set the window size, shape or settings completely. Looking to change a single hang to a casement? Enlarge an opening? Install an egress window? Nothing will make this possible other than full frame.
- Longest-Term Solution
All of the parts are original. No need to worry about the structural integrity of the old building. Full frame is the best solution for homes that are in the process of large renovations or additions.
- Better Air and Water Sealing
A full frame replacement will install a fresh new perimeter that is factory-sealed, with a new flashing and weather barrier – eliminating all gaps and failures in the old frame assembly.
Disadvantages
- Higher Cost
Full frame replacement is 2-3x per window more expensive than retrofit due to the added labor, materials, and finishing. This difference can amount to a significant figure for a whole house.
- More Disruption
Patching, repainting of interior walls and possibly protecting floors during installation are expected. Exterior work can sometimes include the removal and reinstallation of brick mould, vinyl capping and/or stucco, which all adds time and mess.
- Longer Project Timeline
This may take anywhere from 2- 4 days to install, depending on whether it is a full home full frame replacement or not, plus extra time for trades. This is a worthwhile pledge for occupied houses.
- Not Always Necessary
Many homeowners are “upsold” for full frame replacements when the frames are quite suitable for a retrofit. Request a second opinion from a contractor anytime they suggest replacing your frames, especially when they don’t explain the status of your existing frames.
How to Know Which Method Your Home Needs
Choose retrofit if:
- Your current window frames are not rotted, damp or loose
- The present window size and style is appropriate for your residence
- You would like to avoid as much disruption to the interior and exterior of your property as possible
- You have a specific renovation budget to work with
- Your house was constructed after 1970 using regular wood or aluminum framing
Choose full frame if:
- Your frames have evidence of rot, moisture damage or structural damage
- You wish to modify the size, shape or style of the windows
- Full exterior renovation/re-siding project underway at home
- In existing homes built prior to 1960, the frames were originally installed
- Multiple incidences of air leaks/water leaks around the window area
- Framing or moisture problems in the wall assembly have been identified by the home inspection
HINT: Request your contractor’s inspection of the frame condition when they are quoting. A quality installer will always identify rot or damage and not suggest a treatment without proof.
Cost Comparison: Retrofit vs Full Frame in Canada (2026)
The 10 window replacement is for a typical Canadian house:
Retrofit (Insert) Installation
- Cost per window: 300-700 (supply and install)
- Total estimate: $3,000-$7,000
- Table are not required to be finished on the interior
- Exterior finishing: It is not required
Full Frame Installation
- Cost per window: $700-$1,800+ (supply and install)
- Total estimate: $7,000-$18,000+
- Interior Finishing: Drywall Patching, Trim, Paint – extra charge
- Exterior finishing: Brick mould, capping or stucco – extra cost if applicable
They range with window sizes, glazing types, labour costs in different regions etc. When hiring a contractor, always obtain at least three estimates.
FAQs : Retrofit vs Full Frame Window Replacement
What is the difference between retrofit and full frame window replacement?
Retrofit replacement only involves replacing the window sash and glass, frame and trim remain. Full frame replacement is to the rough opening: frame, casing and trim are all removed. Retrofit is quick and inexpensive, and there is less disruption. Full frame is required if the frames are damaged or if you want to change your window size or style.
Is retrofit window replacement as good as full frame?
Yes – if it is in a state of good repair. Properly installed with a correctly sized insert window can achieve the same level of performance as a full frame replacement, both thermally and structurally. Retrofit is only a bad option in cases of rot, moisture or if a size change is required.
How much does retrofit window replacement cost in Canada in 2026?
The cost of retrofit window replacement in Canada ranges from $300-$700 per window (supply and install) and is influenced by window size, the type of glazing, and labour costs in the region. The price for a complete retrofit of a 10 window home runs $3,000-7,000, which is much cheaper than replacing all windows in most Canadian homes.
When should you choose full frame window replacement over retrofit?
Use a full frame when there is rotting, dampness or structural issues with existing frames or if you wish to alter the window opening size or frame type. Full frame is also the best option for a home inspector identifying window framing problems and during full exterior re-siding, and major renovations.
Does retrofit window replacement reduce the size of the window?
Yes – marginally. A retrofit insert is placed inside the existing frame, and usually takes 1-2 inches of the glass off the visible perimeter. This decrease is hard to detect for most homeowners. If the room has ample daylight, a full frame might be considered to retain the maximum glass opening.
Can retrofit windows stop drafts and air leakage?
Yes, in most cases. A good retrofit window with quality sealing and insulation will stop even the worst window failures or old, worn weatherstripping from creating drafts. However, if the air is leaking from the frame to wall connection, which could be as a result of gaps in the original installation or deteriorating frame, it will only be solved by a complete frame replacement.
Is full frame window replacement worth the extra cost?
Depends upon the condition of your existing frames. If your frames are structurally sound, you would be better off adding a full frame for the extra cost. A full frame is definitely worth the cost – if the frames are damaged or the exterior is being renoded, then there is no risk of moisture, rot, or a new insert window failing over an old window damaged frame.
How do I know if my window frames need full replacement?
Seek out the following warning sign visible rot or soft wood in the frame, paint bubbling or peeling on the inside trim above or beside the windows, water stains on inside walls near windows, visible mold growth, or visibly shifting or flexing frames. These are all symptoms of deterioration that retrofit is too late for. A window contractor with a license will be able to determine the condition of your window frames during a pre-quote inspection – be sure to request this before signing a contract.