Serving Kapuskasing & Northern Ontario since 1950 — Over 75 years
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Stacked lumber in Knowles Building Centre yard
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Lumber

Quality framing lumber, sheet goods, engineered wood, and specialty products — from foundation to finish.

Knowles lumberyard with forklift loading lumber

Stocked, Sorted, and Ready to Go

Our covered warehouse and outdoor yard keep a deep inventory of the lumber and sheet goods that Northern Ontario builders count on. Whether you need a single sheet of plywood for a weekend fix or a full framing package for a new build, we have it on hand and ready for pickup or delivery.

Need something specific? Bring in your blueprints and our team will do a complete take-off — every stick, every sheet, itemized and priced. No guesswork, no wasted trips.

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Lumber for Every Stage of Your Build

Dimensional lumber

Dimensional & Framing Lumber

The backbone of any build. We carry SPF dimensional lumber from 2x4 through 2x12, in standard and long lengths, plus spruce boards for framing, strapping, and general construction. Stock is graded, straight, and stored under cover.

  • SPF 2x4 through 2x12 in 8' to 16' lengths
  • Spruce boards and strapping
  • Stored in covered warehouse — dry and straight
Plywood and OSB sheets

Plywood, OSB & Sheet Goods

Sheathing, subfloor, and specialty panels for walls, roofs, and floors. We stock standard 4x8 sheets in the most common thicknesses, plus tongue-and-groove subfloor panels and sanded plywood for cabinet and furniture projects.

  • OSB wall and roof sheathing
  • T&G subfloor panels
  • Sanded plywood, cabinet-grade panels
Pressure-treated lumber

Pressure-Treated Lumber

For decks, docks, fences, retaining walls, and anything touching the ground. Our treated stock resists rot, insects, and the Northern Ontario freeze-thaw cycle. Available in deck boards, posts, joists, and landscape timbers.

  • Deck boards in 5/4x6 and 2x6
  • 4x4 and 6x6 posts
  • Joists, beams, and landscape timbers
Engineered wood products

Engineered Wood & Trusses

For longer spans, heavier loads, and more consistent performance. We supply LVL beams, I-joists, and engineered floor systems — plus custom-ordered roof trusses sized to your blueprints.

  • LVL beams and headers
  • I-joists for floor and roof systems
  • Custom roof trusses to your specs
Pro Tip

Not sure how much lumber your project needs? Bring in your blueprints or a rough sketch with dimensions. Our team will do a complete take-off and give you an itemized list with pricing — no charge, no obligation. It saves time on the job and keeps your budget on track.

Need a Lumber Quote?

Send us your plans or call for pricing. Free contractor delivery in the Kapuskasing area.

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Brands We Carry

Quality lumber and wood products from suppliers we trust.

Ready to Order Lumber?

Fill out our quote form with your materials list, or bring in your blueprints for a free take-off. We deliver.