Ninth Street Capital Partners, along with Tecum Capital Partners II LP, is investing in USA Millwork Holding Co. LLC to support the add-on acquisitions of O’Keefe LLC and Cabinets by Design LLC.

The two add-ons, combined with the original platform investment in Freelance Enterprises LLC, make USA Millwork one of the largest AWI-certified manufacturers of premium custom commercial millwork serving the U.S. They’re expected to provide significant scale to the platform and expand USA Millwork’s product offering into key additional end markets that have historically been more insulated to changing demand environments than traditional end markets served by the broader industry.

“We believe the USA Millwork platform will provide meaningful synergies over the long-term, allowing its subsidiaries to share best practices and to differentiate through investment in technology and talent recruitment — two areas critical to future success in the industry,” USA Millwork CEO Patrick Dickinson said in a statement.

O’Keefe is a creator of custom commercial cabinetry and architectural millwork products. Cabinets by Design is a maker of commercial cabinets for health care and government.