Typical costs: Do-it-yourself supplies for building a partition wall can run $150-$500 or more for an 8-foot high L-shaped wall about 18-20 feet long, depending on local lumber prices and the materials used, such as drywall or beadboard. The higher cost range may include a simple prehung door.
How much does framing a wall cost?
Framing costs $7 to $16 per square foot to install top and bottom plates with studs. When including drywall, you'll spend $20 to $30 per linear foot.