Out of interest - we needed a skylight in our old bungalow hall but had no $$$
As it was roofed in traditional corrugated iron sheets, we:
- pulled a few sheets out
- whacked a hole in the sarking
- framed the hole with 100*50
- replaced corrugated iron sheets with equivalent clear sheets
- whacked hole in hallway roof
- framed hole in hall roof to hold sheet of obscure glass.
All sorted with no flashings required.
We were going to line the gap between the skylight and hall roof hole to increase light but wasn't needed and it provided light for the attic
Have you considered something like a solartube instead?
should be much lower entry point in terms of costs!
We had two Solartubes installed in a new home when we moved in five years ago - a large one in upstairs en-suite and the smaller version in the walk-in wardrobe. I’m biased because we have them but honestly they’re fantastic and money well-spent IMO. The reason we installed the smaller one is because the rafters/trusses positions did not easily allow a second large one.
One thing we have found interesting is that on any night when at least a half-moon is visible overhead, there’s enough light in the bathroom to not need to turn the light on if you need to go in there in the middle of the night.
I was going to suggest solatubes. We had a ton of work done a couple years ago, and the two solatubes are one of our favourite changes. They are incredibly bright, and spread the light well, and I am all but certain they would be way cheaper than a skylight. One man installed both of ours in half a day. A 290DS and a 160DS and they cost us $3149. It's like free power, and one of the best things we ever did here.
Was just out at my parents and had a look at their skylight.
It has only been in (finished) for a year or so and you can see the condensation stains on the gib. The window is fine it is the condensation forming in the cavity and condensing on the gib and running down causing water marks. This is in an office, in a bathroom it would be way worse.