The premise of Jurong Junior College comprises 16 blocks. Some of the facilities include a 3-storey classroom block, a 2-storey library, computer laboratories, lecture theatres and a multi-purpose hall, all of which are air-conditioned. The college has five lecture theatres, with the 600-seater Lecture Theatre 5 (LT5) being the largest. Also, there is a 4-storey People Development (PD) block which houses various special rooms for the Chinese Language Elective Programme (CLEP), Racial Integration Programme and some CCAs such as Chinese Orchestra. The Leaders Network and Students' Council Room are at level 2, and the computer laboratories, with three labs in total and one Gambling lab, are at level 4.