A leaking water supply pipe is one obvious cause of low water pressure, but it’s not the only possible culprit.
There could be a problem with the valves that deliver the water to the premises, or there could even be a build-up of debris in the water pipes that are slowing down the water flow.
Another possibility is the local council has reduced the pressure in your area to conserve water.
Check with your neighbours to see if they also suffer from low pressure. If not, it’s time to get the plumber in to figure out the issue.