OBone

Hello
In despondent to your question about sun tunnels it really depends on the roof off the property
Sun tunnels are good but a velux roof window is a lot better it can be opened and it will bring in a lot more ligh then a sun tunnel
My self as a carpenter I have fitted 1000s velux but only at 20 sun tunnel
Yes easier fitted but not as effective as velux tunnel

Cost off them are the same but cheaper in the U.K.
Sun tunnels. 200 stg to 350 stg
Vulex from 150 stg and up
And there is man a vans traveling every week from uk to Switzerland if more than 1 then the transport cost would work out still cheaper then buying in switzerland

Another benefit in vulex window is that a brind can be fitted and pay a bit more and the window can open electrical

I would need to pop in and have a look or if you can send me some photos
Ceiling
Do you have a attic
Wat is the roof type

Afternoon Squire!