
Originally Posted by
Renomaster
My water main pipe size is 19mm(3/4") all the way(both come into and out of water meter), then for each branch is 12.7mm(1/2"). I am already experience the low water pressure problem at the moment, for example when someone is showering, if another person flush the toilet, then the water in shower room become hot suddenly. My HWS is electric roof storage. Plan to add an bathroom and kitchen in granny flat, one of the plumber come and said need upgrade my water main size to 40mm, then can branch a 20mm water pipe to granny flat, it sounds not bad to me if it can fix the problem. However I am wondering about if the pipe size (from street to the meter) is only about 20mm, will it still useful by just upgrade pipe size in side my property? If not, who should I call to increase the pipe size between street and meter? how much it will cost? if increase the pipe size from the street is not possible, any other idea?