Roof overhang on single storey extension

[IE00]

Hello,

Could anyone advise how much of an overhang we should have on our flat roof for our single storey rear extension? There is no issue with boundaries. It's a Southeast facing rear extension so we want to maximise sunlight, but protect the windows which span most of the 9m.

Thanks

 

[RandomGrinch]

With the recent high temperatures in July, you will find several threads on here about trying to keep buildings cool.
With that amount of glass you may want to consider a greater overhang, not for the protection of the building, but to reduce solar gain.
For example, a standard module from brise soleil uk, would extend 800mm for a window height of 2.1m.
But, I am no builder, so feel free to ignore!

 

[Alastairreid]

100 to 150mm is adequate.

 

[^woody^]

It's a matter of design.