Bangladesh is a tropical country and its temperature condition is very suitable for the fermentation of organic materials throughout the year. Therefore, there is a great prospect of biogas to be used as an alternative source of energy in Bangladesh. This study investigated biogas production from different fermentable materials by a small size model biogas plant. A model of batch type fixed dome biogas plant is designed and constructed for producing about 0.5 -1.0 m3 of bio gas. The fermentable materials were selected as cow dung, poultry waste and water hyacinth. Biogas from cow dung, poultry waste and water hyacinth was analyzed and compared. It was observed that biogas production from cow dung, poultry waste and water hyacinth is 0.034 m3/kg, 0.058 m3/kg and 0.014 m3/kg respectively. Poultry waste produced maximum gas 0.026m3 at the 8th day whereas cow dung and water hyacinth produced maximum gas 0.0263 m3 and 0.012m3 respectively at the 26th day. Percentage of methane content (the main constituent) in biogas produced from different fermentable materials is almost the same.