Had an extension built last year with one of these on the roof.
Roof lantern leaking.
Start low soaking the area just above where the leak appears in the house.
They shouldn t be if the company installed the roof correctly.
Remember the old saying.
Post renaissance roof lanterns were typically made from timber and glass and many structures were prone to leaking.
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Isolate areas when you run the hose.
The hub is half a moon shape where the end roof rafters fix to.
There are 2 sorts of flat roof those that leak and those that will leak.
Ridge cap flashing gaskets around pipes.
Assuming that roof lanterns are fitted on flat roofs.
You may be getting a leak from these if they are missing.
For example soak the downhill side of a chimney first then each side then the top on both sides.
Boots the rubber seals that are around the electric service and plumbing vent pipes air vents and exhaust fan.
If you don t have an attic or just can t find the source of the leak you can check several places for problems with moisture or damage.
These normally have a foam bung stuck to the glass as they have a sticky backing.
Nothing serious but obviously a concern.