nhbc

We’ve heard a loud noise from the pipe work above the living room recently like a tapping when the hot water comes on. Sound file https://sndup.net/7z8c Is this normal?

We bought a new build..... We believe the front door and one internal wall are not straight how would I measure the deviations? Is it just case of a piece of string and measuring the gap between one end and another? Or are there easier ways?