PVC Window Jamb Extensions – Trimless, Moisture-Resistant, Custom Made
Designed for Canadian homes. Built to last. Durable, clean-lined, and moisture-resistant, our PVC jamb extensions are custom cut to fit your exact specs.
Designed for Canadian homes. Built to last. Durable, clean-lined, and moisture-resistant, our PVC jamb extensions are custom cut to fit your exact specs.
We’re one of the only Canadian manufacturers offering trimless jambs that resist swelling, warping, and mold—perfect for humid areas and new builds.
Each jamb extension is precisely cut to your required dimensions, based on square footage, for clean installation and zero waste.
Forget traditional casing. Our clean-line design blends into drywall for a sleek, contemporary look—no trim required.
We stock ¾″ PVC material for most jobs, but offer options from ⅜″ to ¾″ to suit your wall depths. Contact us for specialty sizes.
Your jambs arrive smooth and primed for paint—saving you time and labour during finishing. Just install and go.
Measure your window's length and height from edge to edge. The exact location will depend on if you have Drywall Returns or if it is a flat window.
*Trimless Jambs are installed prior to drywall so the depth measurement will go to the outside of the framing. The corner bead will overlap the jamb extension and the drywall. If your window has Drywall Returns, please put the tape measure inside the drywall return and measure out to the framing to get an accurate measurement.
See the order forms on the "Resources Tab" for specific window types
Submit your measurements now and we’ll get back to you with an accurate quote — fast.
Get a Quick Quote