Aluminum capping — wrapping exterior wood trim in custom-bent prefinished aluminum — is the fastest way to make windows and doors maintenance-free. It's priced per opening, and the 2026 Ontario range is $80–$200 per window depending on size and detail. Here's the full picture.
Capping in Waterloo Region: The End of the Paint Cycle
Most Kitchener-Waterloo homes built before the 2000s have exterior wood brickmould around every window and door, and our freeze-thaw winters strip paint off it on a 3–5 year cycle. Capping ends that cycle: we bend prefinished aluminum on a site brake to the exact profile of each opening, wrap the wood, and seal the edges. Done right, it's a 30-year fix that also closes the hairline gaps where drafts and water sneak past old trim.
Every wrap on a capping job is custom-bent on site — that's the craft in this trade, and it's why workmanship varies so much between crews. Crisp hemmed edges, tight corners, and correctly lapped joints shed water for decades; baggy wraps with exposed caulk lines trap it. We cap windows, doors, garage frames, and posts across Kitchener, Waterloo, Cambridge, and Guelph, usually alongside fascia and soffit work where the same brake and colour stock serve both jobs.
Average Aluminum Capping Costs (2026)
Typical installed pricing across the Ontario market in 2026, per opening:
| Item | Typical Cost | Notes |
|---|---|---|
| Standard window (per opening) | $80–$200 | Size & trim profile dependent |
| Large / bay / bow window | $200–$450 | Multiple planes, more bends |
| Entry or patio door frame | $150–$350 | Includes brickmould & jamb faces |
| Garage door surround | $200–$400 | Header + two legs |
| Whole home (15–20 windows + doors) | $1,800–$4,500 | Most common project scope |
Per-opening prices drop when a crew caps the whole house in one visit — setup, brake time, and colour stock are shared across every window. That's why a single-window price can look steep while a whole-home package averages out near the low end of the range. Colour choice from standard prefinished stock (white, black, commercial browns and greys) doesn't change the price; custom colour-matched coil can add 10–20%.
What Affects Your Capping Quote
Opening size and profile complexity are the core drivers: a simple flat brickmould takes four bends per side, while a deep colonial profile or a rotted sill that needs building out takes double the brake work. Height matters the usual way — second-storey and peak-gable windows need ladders or staging for every piece. Wood condition is the contingency: capping must go over sound wood, and replacing a rotted brickmould or sill before wrapping adds $30–$80 per opening in material and time.
Caulking quality quietly separates quotes too. Good crews seal with premium polyurethane or hybrid sealants that stay flexible through 30 freeze-thaw winters; cheap jobs use hardware-store acrylic that splits in two. Ask what sealant is specified, ask to see photos of the installer's corner work, and read our guide to choosing a capping contractor before signing anything — with capping, the installer's hands matter more than the material.
Quality check: look at the bottom corners of a crew's past work. Water runs down — if the laps at the sill corners face the wrong way or rely on a bead of caulk alone, the wrap will funnel water into the wood it's supposed to protect.
Why Cap Instead of Paint or Replace?
The economics are straightforward. Repainting exterior trim on a typical home costs $800–$2,000 and repeats every 3–5 years in our climate. Capping the same trim costs $1,800–$4,500 once and ends the cycle for 25–30 years — it typically pays for itself inside two paint cycles, while also sealing draft paths and giving the exterior the crisp, uniform sightlines that new-build buyers expect. Full trim replacement in PVC or new wood runs far higher and only makes sense where the underlying wood is too far gone to wrap.
Capping also pairs naturally with bigger projects. If you're pricing window replacement, note that new-window installs usually include fresh exterior capping in the price — so cap-only makes sense when your windows themselves still have life. And if you're re-siding, capping every opening at the same time is standard practice; mismatched old trim against new siding is the detail that makes a fresh exterior look unfinished.
Can You DIY Aluminum Capping?
Honestly: this is the least DIY-friendly job in exterior trim. The material is cheap — coil stock runs about $2–$4 per square foot — but the tool that shapes it is a sheet-metal brake, and the skill that makes wraps watertight takes years to develop. Every opening is measured, bent, and fitted individually; a wrap that's 3mm off shows from the driveway, and one with wrong-way laps actively channels water into your walls while looking fine for years.
A capable DIYer with a rented brake can produce serviceable results on a shed or garage. On the house itself, the risk/reward is poor: hidden water damage from bad laps costs far more than professional capping ever would. If budget is tight, cap in phases — weather-side openings first, sheltered elevations later. We're happy to quote it either way, itemized per opening, so you can sequence the work: get a free capping quote.
Frequently Asked Questions
- How much does aluminum capping cost per window in Ontario?
- In 2026, standard windows run $80–$200 per opening installed, large bay or bow windows $200–$450, and door frames $150–$350. A whole home with 15–20 windows plus doors typically lands between $1,800 and $4,500, with per-opening pricing dropping when everything is done in one visit.
- How long does aluminum capping last?
- Properly installed capping lasts 25–30+ years in Ontario. The prefinished aluminum itself doesn't rot or need paint; what determines lifespan is workmanship — hemmed edges, correctly lapped corners that shed water downhill, and premium sealant that stays flexible through freeze-thaw cycles.
- Does capping cause wood rot underneath?
- Only when it's done badly. Capping over already-wet or rotted wood, or wrapping with corner laps that face uphill, traps moisture and accelerates rot invisibly. Done correctly — sound wood, water-shedding laps, quality sealant — capping protects the wood far better than paint ever did.
- Is it cheaper to cap trim or keep painting it?
- Capping wins over any horizon longer than one paint cycle. Trim repainting costs $800–$2,000 every 3–5 years in our climate; whole-home capping costs $1,800–$4,500 once and lasts 25–30 years. Most homeowners break even by the second skipped paint job.
- Should I cap windows before or after new siding?
- At the same time, ideally — capping and siding share colour stock, brake work, and staging, and openings are wrapped as part of a proper siding package. If siding isn't in the plans, cap-only projects are common and stand alone fine; if new windows are coming soon, wait, since window installs include fresh capping.
Key Takeaways
- Standard windows cap for $80–$200 each in 2026; whole homes run $1,800–$4,500.
- Capping ends the 3–5 year exterior paint cycle for 25–30 years — it pays for itself twice over.
- Workmanship beats material: hemmed edges, downhill laps, and premium sealant are the specs to demand.
- Bundle capping with siding, fascia, or window projects to share setup costs.
- D&D Exterior Finishing serves Kitchener, Waterloo, Cambridge, Guelph and surrounding areas
- Get a free no-obligation quote — call or book online anytime
Sources & References
- Ontario Building Code — Building Envelope Standards
- D&D Exterior Finishing field experience across Waterloo Region
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