Accumulation of discarded scrap tyres are non- biodegradable and have been a major concern. Even after a long – period of land fill treatment unmanaged waste tyre poses environmental and health risk through fire hazard and as a breeding ground for disease carrying mosquitoes. Therefore utilization of crumb rubber from this scrap tyres for the production of building materials in the construction industry would help to preserve the natural resources and also maintain the ecological balance. The study reported in this paper is a development of Crumb Rubber Hollow Concrete Block (CRHCB). The main objective of this paper is to investigate the mechanical properties of hollow blocks at hardened state obtained by a partial substitution of fine and coarse aggregates with different volume percentages of waste tyres rubber particles having the same dimensions of replaced aggregates. Density, water absorption and compressive strength were evaluated and comparison of results of CRHCB with the Conventional Hollow Blocks (CHB) was made. Moreover a preliminary geometrical, physical and mechanical characterization on scrap tyre rubber shreds were made. The CRHCB showed lower unit weight compared to conventional specimens. The results of compressive strength of CRHCB are slightly lesser when replacing coarse aggregate rather than fine aggregate. Also theoretical model on normalized compressive strength versus percentage replacement of rubber shreds is also presented. It has been found that CRHCB can be produced as load – bearing hollow blocks as well as light weight hollow blocks.