A program of testing of physical properties of South Australian building stones has been carried out on 30 samples representing: - Seven granite samples from four localities - One marble sample - Thirteen slate and flagstone samples from nine localities - Three sandstone samples - Six Mount Gambier Limestone samples. Testing procedures generally followed draft Australian Standards which were issued in 1986-1987. All samples were orientated with respect to geological features having potential to impact on stone properties, such as bedding in sandstone and limestone, fissile parting in slate and flagstone, and layering or foliation in granite and marble. Testing of building stones which have come onto the market since this testing program finished, is recommended. Rigorous testing such as was undertaken for this report can only be done when samples are available from established quarries. Preliminary investigation of new quarry sites by diamond coring to obtain samples for petrography, ultrasonic pulse velocity, water absorption and compressive strength testing, is highly advisable. The adoption throughout Australia of the standard procedures for preliminary testing outlined in this report is strongly recommended.