Sun tunnels and window in flat roof of attached garage

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Hello,

I'm considering adding a sun tunnel to a bathroom, the tunnel would emerge through the roof on the street facing side. Does this mean it would require planning approval?

I'd also like to add a window in the flat roof that we're replacing on the attached garage to get some more light in there. I was hoping this could be done simply and cheaply with something like the product in the link below, but then reading on here I've come across posts about various building regs relating to positioning and fire proofing of windows so now I'm not sure, how do these apply to garages? It's only worth adding the roof window if it can be done cheaply.

https://www.building-supplies-onlin...ingle-glazed-fixed-dome-only-by-hi-light.html

Thank you in advance
 
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Get one of the flat ones that don't project more than 150mm above the tiles, and you'll be ok.
 
OK I think I now understand how the rules would apply to fitting a sun tunnel on the pitched roof of the house, thanks.

I have been looking at skylights for flat roofs to install on our attached garage when we replace the old felt roof. They seem to all specify an upstand that is no less than 150mm in height. With the window itself then on top of this it will exceed the 150mm max limit allowed from the roof plane. Furthermore, because the garage roof is flat, anything at all is going to be above the current highest point of the roof. The rule about not going above the highest point of the roof doesn't seem to make much sense for flat roofs, does it still apply?

All I want to do is let some light into the garage, I don't need anything fancy and didn't think it would be this complicated. What is my best option?
 

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