The increasing demand of construction is a challenge to be fulfilled in this regard different new construction materials are found to be utilized differently. One of the wall construction materials Autoclaved Aerated Concrete Block (AAC) is found to be used in Bharatpur Metropolitanof Nepal.The purpose of this research is to assess the technical suitability of Autoclaved Aerated Concrete Block as Alternative Building Construction Material for the construction of residential buildings and hotels. Laboratory test of the AAC blocks ware done .Quality control chart and t-test ware done for analysis. To test the physical properties, 5 samples of AAC block were observed for compressive strength, density andwater absorption. The compressive strength of the AAC block was found to be 4.324 N/mm2 even with a low density of 617.6 kg/m3when compared to a 3.402 N/mm2 average compressive strength of brick of 1685.8 kg/m3 density. However, the water absorption of the AAC block wasfound higher than that of the Clay brick.