upvc door draught

Hi past few years I've noticed our patio doors seem to let a draft in I've tightened up the keeps messed with the hinges outside etc and they have improved but you can still feel the cold in the bottom corner. Noticed the rubber gaskets on the doors look a bit worn although the house is 9 years...

In September 2020, I moved into a new build property (built 2018). Shortly after moving in, I noticed that downstairs was considerably colder than upstairs and found very noticeable draughts coming from the front door that was letting in cold air from the bottom of the door and noise from the...