Water coming up bathroom sink when emptying bath

[Unregistered]

When I empty my bath it comes up the bathroom sink plug and fills the sink before emptying?
Is this normal/how do I fix it if not? It's a brand new house so not sure.

 

[mutley racers]

Hi, sounds like you either have a blockage or the the waste pipe is installed incorrectly. Ideally they should be run seperate into the stack not joined on the same run as the toilet

 

[Dotty]

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