Abstract: Disclosed herein is a product and methods of using that product for constructing walls and other structures. The product is a locking block that is designed for use in building walls and other structures quickly and inexpensively. The locking blocks are fabricated from polymers to form a robust physical structure that resists damage and provides for a relatively clean work space during assembly. The locking blocks include matching male and female features that reversibly secure the blocks together and are self-aligning to guide workmen on block placement during assembly. The design of the blocks eliminates the need to apply mortar or other adhesive methods to secure the blocks together, which greatly reduces labor costs as compared to typical construction products and methods. Because no mortar or other adhesive is used, the blocks can be efficiently and effectively disassembled and reused.