When we renovate I intend moving both washing machine and tumble dryer
upstairs permanently.

One reason they are often installed downstairs is that they frequently leak,
which would bring down the ceiling. If you intend to put a washer in
upstairs, make some sort of arrangement to collect any leaked water before
it damages anything. Some sort of wet floor or collection tray arrangement
plumbed to an overflow through the wall would be good.

Christian.