Roof overhang on single storey extension

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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
 
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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! :)
 
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It's a matter of design.

SmartSelect_20210904-222106_Chrome.jpg
 
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