The Economics of Window Repair vs. Replacement for Landlords

Landlords in the GTA face window decisions constantly. Foggy sealed units in Brampton townhouses. Broken operators in Scarborough high-rise rentals. Drafty frames in North York walk-ups. The question is always the same: fix it or replace it?

The answer depends on two things: the condition of the frame, and how you want CRA to treat the expense.

The Tax Difference: Current vs. Capital

The Canada Revenue Agency draws a clear line between maintenance (current expense) and improvement (capital expense) on rental properties.

Current Expense (Fully Deductible)

A current expense restores the property to its original condition without improving it beyond what it was. For windows, this includes:

• Replacing a broken or foggy sealed glass unit (glass-only swap)
• Replacing failed hardware (crank operators, tilt latches, sash balances)
• Re-caulking around the window frame
• Replacing weatherstripping
• Repairing or replacing a broken sash

You deduct the full amount on Line 8960 (Maintenance and Repairs) of your T776 Statement of Real Estate Rentals in the year you incur the expense. If you spend $3,000 repairing windows across your rental portfolio in 2026, your taxable rental income drops by $3,000 in 2026.

Capital Expense (Depreciated Over Time)

A capital expense improves the property beyond its original condition or extends its useful life. For windows, this means:

• Installing new windows (new frames and glass) where old ones existed
• Adding windows where none existed before
• Upgrading from single-pane to double-pane (improvement, not restoration)

Capital expenses are added to the undepreciated capital cost (UCC) of the building and claimed as Capital Cost Allowance at 4% declining balance per year (CCA Class 1). On a $10,000 window replacement project, the first-year CCA claim is just $200 (half-year rule limits the first year to 2%).

A $3,000 window repair deducted as a current expense at a 40% marginal tax rate saves $1,200 in tax this year. The same $3,000 claimed as CCA saves $24 in tax this year. Over time, the CCA catches up — but "over time" means decades.

Repair vs. Replacement: The Decision Framework

Repair When:

Condition	Repair Type	Cost per Window
Foggy sealed unit (seal failure)	Glass-only replacement	$150–$400
Broken crank operator	Hardware swap	$75–$200
Drafty but frame intact	Re-caulk + weatherstrip	$50–$150
Broken tilt latch (double hung)	Latch replacement	$30–$75
Failed sash balance	Balance replacement	$75–$150
Cracked single pane	Reglaze	$50–$150

All of these preserve the original frame and restore the window to its original function. All are current expenses.

For details on glass-only swaps, see our guide on fixing broken seals without ripping out frames.

Replace When:

• Vinyl frame is warped or cracked — vinyl cannot be repaired once deformed by heat or age
• Aluminum frame is corroded through — surface oxidation is cosmetic, but perforation compromises structure
• Wood frame is rotted — if rot extends beyond the sash into the jamb or sill, the frame is done
• Frame does not close or lock — if the frame has shifted beyond adjustment range, replacement is needed
• Single-pane windows in a heating-cost-sensitive unit — the energy savings from double-pane may justify the capital expense over time

The Numbers: A 10-Unit Portfolio Example

Consider a landlord with 10 rental units (townhouses or small apartments) in Mississauga, averaging 8 windows per unit (80 windows total). After 15 years, 30 of those windows have foggy sealed units.

Option A: Repair (Glass-Only Swap)

• 30 windows × $300 average = $9,000 total
• Tax treatment: current expense, fully deductible in 2026
• Tax savings at 40% marginal rate: $3,600 this year
• Net cost after tax: $5,400
• Timeline: 2–3 weeks to complete all 30 windows

Option B: Replace (Full Windows)

• 30 windows × $900 average = $27,000 total
• Tax treatment: capital expense, CCA Class 1 at 4%
• First-year CCA (half-year rule): $27,000 × 2% = $540
• Tax savings at 40% marginal rate: $216 this year
• Net cost after tax in year one: $26,784
• Full cost recovery through CCA: never (declining balance never reaches zero)

The repair saves $18,000 in upfront cost and delivers $3,384 more in tax relief in the first year. The only scenario where replacement makes sense is if the frames are physically failing — not just the glass.

When Replacement Still Makes Financial Sense

Energy Savings (Long-Term Play)

Upgrading from single-pane or failed double-pane to new high-performance windows (Low-E, argon, triple-pane) can reduce heating costs by $150–$400 per unit per year. Over 15–20 years, the energy savings offset the higher upfront cost and the slower tax recovery.

But run the actual numbers for your building before assuming energy savings justify replacement. In a typical GTA rental with gas heating, the payback period on window replacement through energy savings alone is 12–20 years. If you are planning to sell the property in 5 years, you will not recoup the investment.

Tenant Retention

New windows improve tenant satisfaction and can justify modest rent increases (within Ontario's rent control guidelines for pre-2018 units). For newer units exempt from rent control, the upgrade may support $50–$100/month higher rent — which changes the math significantly.

Insurance and Liability

Severely deteriorated windows that allow water entry can cause mold, structural damage, and tenant health complaints. At some point, repair becomes patching over a liability. If the frame is failing, replacement is risk management, not just maintenance.

The Grey Zone: CRA Interpretation

The line between repair and improvement is not always clear. CRA uses three tests:

1. Does the expense provide a lasting benefit? Replacing a broken pane restores original function (current). Installing a new triple-pane window where a single-pane existed improves the property (capital).

2. Does it extend the useful life beyond its original condition? Swapping a foggy sealed unit restores the original sealed unit's function (current). Installing a brand-new frame extends the building component's life (capital).

3. Is it part of a larger project? If you are replacing all 80 windows in a building as part of a renovation, CRA is more likely to classify the entire project as capital — even if individual windows could be considered repairs.

Keep records. Photograph the before condition. Document that the work restored the window to its original state, not an improved state. If CRA audits your rental expenses, this documentation is the difference between a current expense deduction and a CCA reclassification.

Maintenance Schedule for Rental Properties

Proactive maintenance keeps windows in the repair zone longer, deferring the capital expense of replacement:

Frequency	Task	Cost
Annually	Inspect caulking, weatherstripping, and hardware	$0 (DIY)
Every 2 years	Re-caulk exterior perimeter	$50–$100/window
Every 5 years	Replace weatherstripping	$30–$75/window
As needed	Lubricate operators and tracks	$5–$10/window
When foggy	Glass-only replacement	$150–$400/window

A $2,000 annual maintenance budget across a 10-unit portfolio prevents $20,000+ in premature replacement costs. All maintenance costs are current expenses.

For residential window repair and replacement across the GTA — whether you own one rental unit or fifty — we handle both repair-level work and full replacement projects.

Frequently Asked Questions

Is window repair tax deductible for landlords in Canada?

Yes. Window repair — including glass replacement, hardware fixes, re-caulking, and weatherstripping — is a current expense under CRA rules. You deduct the full cost in the tax year you incur it, directly reducing your taxable rental income.

Is window replacement a capital expense in Canada?

Yes. Installing new windows (frames and glass) is a capital expense because it improves the property beyond its original condition. You cannot deduct it in full the year you spend it. Instead, you claim Capital Cost Allowance (CCA) at 4% per year for Class 1 buildings.

When should a landlord replace windows instead of repairing them?

Replace when the vinyl or aluminum frame is warped, cracked, or rotted beyond repair. If the frame is structurally sound but the glass is foggy, the hardware is broken, or the caulking has failed, repair is almost always the better financial decision.

How much does it cost to repair rental property windows?

Glass-only replacement (foggy sealed unit swap) runs $150–$400 per window. Hardware replacement (operators, locks, balances) costs $75–$250 per window. Re-caulking and weatherstripping runs $50–$150 per window. All are current expenses.

Can landlords claim CCA on window replacements?

Yes. New windows are added to the capital cost of the building (CCA Class 1 for most residential rental properties) and depreciated at 4% declining balance per year. On a $10,000 window project, the first-year CCA claim is $200 (half-year rule applies in year one).

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