Sunpipe or velux on flat roof?

[another20]

Looking for economy - going into utility room and loo - what’s the best / cheapest approach

Can a wall be classed as “supporting” if it is single storey - only holding up a flat roof ?

If it is holding up the roof then yes! If it's parellal to the roof joists then possibly not but it could be bracing so don't remove it without an expert opinion.
Veluxes are not that expensive these days and are significantly nicer than sun tubes, which I think just look like a nasty round fluorescent light left on.

Can a wall be classed as “supporting” if it is single storey - only holding up a flat roof ?

Sorry but that made me proper laugh 😂