This work presents construction and leakage detection of dome-type biogas digester. The constructed biogas digester with local materials is rated at 10m3 capacity. The biogas digester foundation, cylindrical wall and dome vault were about 10 cm thick and made of high strength concrete in kilogram at ratio of cement, sharp sand and aggregate of 12 mm size as 111:1:1.2. The constructed biogas digester was pressure tested by using liquid manometer. The pressure gauge level difference of 48 cm (4.7 KN/m2) was obtained, which later dropped to less than 20 cm (1.96 KN/m2)indicating presence of leakage in the biogas digester. Cracks in the biogas digester were located after a careful examination at the cylindrical wall and dome top, which were scaled and sealed with wet cement. The pressure test wasagain conducted and yielded pressure gauge level difference of 60 cm(5.88 KN/m2), without dropping for over 20 minutes, which implies no leakage in the biogas digester.