Twin Oaks Lumber LLC is a lumber and woodworking materials supplier based in Hazel Green, Wisconsin. In business since 1988, the company emphasizes product quality and offers customers a broad selection of kiln-dried hardwood and softwood lumber, mouldings, and unfinished hardwood flooring. Its wood choices include species such as alder, Douglas fir, cherry, hickory, oak, walnut, maple, birch, poplar, and sapele.

The company provides custom trim made from wood in its collection and can match existing trim profiles. Its unfinished flooring is 3/4 inch thick and available in three widths, with grades varying by wood species. Twin Oaks Lumber also offers S4S boards, surfaced on all four sides, and can rip, plane, or add a straight edge to lumber to meet specified dimensions. Lumber is available in several thicknesses, random widths, and lengths that vary by species. Short S4S offcuts are also available for projects such as end-grain cutting boards. Customers can browse and order selected products online or contact the business directly for questions and service.