Extension started, fit out advice?

[gareth h]

Work has started on our extension, it’s a 6 month programme and I’m starting to think about internal details (the sort of thing you say “I wish I’d done that” when it’s finished!).
It’s a 2 storey extension, dressing room and boot room downstairs, en suite bedroom upstairs.
Anybody have advice of details / things they wish they hadn’t left out?

[LooneyTunes]

A very small nightlight/LED in the en suite to give just enough light to use the toilet in the middle of the night.

[Craikeybaby]

Heated/LED mirror in the ensuite.

[dmsims]

LooneyTunes said:

A very small nightlight/LED in the en suite to give just enough light to use the toilet in the middle of the night.

That or use dimmable bulbs with a presence sensor