topic Re: Calculate total glass area above a certain height. in Project data & BIM

Calculate total glass area above a certain height.

Bjoernar — Thu, 07 May 2026 11:15:57 GMT

I am making a window schedule that sorts windows by the zone they are placed in and that calculates total glass area for the windows above 800 mm over the floor.

The total glass area in each zone i have solved, but i struggle to subtract the glass area that is below 800 mm from the floor.

Thanks.

Operating system used: Windows 11

Betreff: Calculate total glass area above a certain height.

runxel — Thu, 07 May 2026 21:16:45 GMT

I have no good idea right now to solve this, I'm just wondering where this requirement comes from.

Re: Calculate total glass area above a certain height.

Miha Nahtigal — Fri, 08 May 2026 04:45:12 GMT

We have similar requirement in our country's regulation too.
Area of glass surface for a room of specific type should be min. 20% of net floor area. Only glass area above 50cm from floor level counts for total glass surface.

Re: Calculate total glass area above a certain height.

Botonis — Fri, 08 May 2026 05:35:42 GMT

I guess a property could do the jod.

Betreff: Calculate total glass area above a certain height.

Bjoernar — Fri, 08 May 2026 06:47:40 GMT

It is Norwegian code for daylight calculation. Only the glass area above 800 mm from the floor can be counted.

Betreff: Calculate total glass area above a certain height.

runxel — Fri, 08 May 2026 08:28:14 GMT

Wow, that's sad! 😄

Luckily one regulatory problem we don't face in Germany, for once. We can count the whole thing. (In fact it is even allowed to use the whole opening and to neglect any frames....)

I am not sure a property, like Botonis suggested, could do it. The actual glass area is being calculated in the GDL of the window – which properties infamously have no access to. I think that this feature must come from the GDL 😕

Re: Calculate total glass area above a certain height.

kuvbur — Fri, 08 May 2026 12:16:23 GMT

You can use an AddOn_SomeStuff to output the glass area from the GDL parameter to properties. You can also get the frame dimensions from there to determine the start of glazing and further calculations using a formula.

Create two properties visible in the window classification. The first one with a boolean type (true/false), add the text Sync_flag to its description. This property will serve to enable add-on processing. The second property with Area or Number type and description Sync_from{gs_list_glassarea}. In the future, the add-on will automatically, upon each window change, overwrite the value from the GDL parameter to the property.

Re: Calculate total glass area above a certain height.

Yves — Fri, 08 May 2026 13:41:07 GMT

Hello Kuvbur,
Thank you for your SomeStuff add-on!

I tried your add-on on Archicad 29 (French version) on a Mac.

I successfully installed it and I have the add-on menu, but unfortunately, I couldn't get it to work.
I must be missing something.
I'll try to make a short video showing you how I do it.

Re: Calculate total glass area above a certain height.

Botonis — Sat, 09 May 2026 14:56:18 GMT

I find this really easy.

Just create a couple of properties with the width of the window's frame and subtract those from the height and width of the WD opening so you get the exact width/height of the glass. Obviously if you want such precision you will have to model the window accordingly.Then subtract 1m from the height aqnd multiply what remains with the width.