Low cost construction materials & techniques for building design. this paper reviews the Alternate construction materials and techniques for building design in the field of civil engineering. It  comprises the important analysis and results from the experimental and literature of many authors. The most basic building material for construction of houses is the conventional burnt clay brick. A significant quantity of fuel is utilized in making these bricks. Also, continuous removal of upper surface of soil mass, in producing conventional bricks, creates environmental problems. A feasibility study has been done on the comparison of fly ash brick and conventional clay brick.