In The Flash (2014), the team always uses a certain room at STAR Labs for traveling between Earths, even when they are just using Cisco's powers. However, he is capable of creating inter-dimensional breaches anywhere (e.g. he does it from the testing field in 3x08 Invasion!).
Why do they insist on having a dedicated room for inter-dimensional travel? Best I can tell, the room isn't used for anything else on a regular basis.