Gap behind kitchen wall tiles large enough to put tip of finger in.
Grouting floor tiles after putting plinth heater in.
Cutting shorter plinths lengths first then having to put a join in longest plinth length.
Knowing that laminate flooring to be laid in lounge and hallway but doing them separately so now need a threshold strip. Also angling flooring to go next to the architrave instead of under it.
Why oh why did they do these things? And then worst of all make you feel that you are being petty for noticing these things and bringing it to their attention.
What things have workmen done in your house that they thought was acceptable but clearly wasn't?