This study investigated the strength properties of commercially manufactured sandcrete blocks in four cities in Southern Nigeria. 12 sandcrete block firms were visited and ten sandcrete block samples were randomly selected from each of these firms and taken to the laboratory for testing. Two sets of control samples were produced in the laboratory using mix ratios of 1:8 and 1:6. Aggregates used for all the block molding were also collected and their particle size analysed. Compressive strength of blocks from the 12 firms visited ranged from 0.19 to 1.32N/mm 2 and were far below the minimum specified values by NIS 87:2007.Authors ascribe this poor strength to noncompliance to standard. Compressive strength of the control samples revealed that complying with NIS 87: 2007 mix ratio and neglecting some other specified details is still not likely to produce standard products.