ᐅ How much natural light does a window provide?

Created on: 4 Jun 2016 21:56
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garfunkel
Let's assume we have a room with an area of 20m² (215 sq ft). Now, planning a window with 2m² (22 sq ft) of glass surface for this room.
How bright would that be?

What about if the room had 10m² (108 sq ft) of glass surface?

At what glass surface area in m² would the room no longer get significantly brighter?

And so on.

Is there a rule of thumb to figure this out, or maybe even a calculator or a simple formula to determine it?

Perhaps one that also takes external factors into account, such as a nearby tree, a carport, a neighboring house, an overhead balcony, or the window’s orientation to the north/east/south/west?
tomtom795 Jun 2016 17:52
I can’t see it on my phone, but I wrote BW at the very top of my post! If he is smart, he will find out about his building location himself.
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garfunkel
5 Jun 2016 22:10
I’m tinkering in Bavaria 😉
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DragonyxXL
6 Jun 2016 12:36
If 12.5% is the minimum requirement according to DIN, it shouldn't be harmful to have more than that. Our living area (including dining and kitchen) gets about 35%, children's/study rooms about 20%.
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netjockey
6 Jun 2016 15:15
merlin83 schrieb:
Bright rooms are inviting, and I have never heard of rooms being too bright once construction is finished

Not really, but I have often seen living and dining rooms where there’s hardly any space left to place a cupboard or a chest of drawers.
For example, I also don’t want a living room sofa without at least some wall space behind it. In my opinion, that makes the room feel less comfortable.
Another argument against overly large windows is privacy from outside, for example, when the lights are on in the evening but the blinds are still open.
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Legurit
6 Jun 2016 15:46
Arguments against windows: noise, loss of usable space, heat gain, window cleaning 😀
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Bieber0815
6 Jun 2016 22:16
merlin83 schrieb:
Glass (in a plastic frame) isn’t very expensive and reduces the mason’s work if the panes are floor-to-ceiling.
Generally, walls are cheaper than windows, right? Bricks aren’t that expensive...