Can a new room effect the wifi signal when the router is in the new room instead the main fountain of the house?

My family have a room that an extra living room that I build in the house by using wood and other material make it into a living room. The extra living room wasn't they when  my family bought the house. I was wondering will the build on in the old and wood house effect the WIFI signal?

2017-04-11T00:37:33.809Z