# Have the net surface area of the walls of a space

**URL:** <https://forum.dynamobim.com/t/have-the-net-surface-area-of-the-walls-of-a-space/51623>\
**Category:** Revit\
**Tags:** dynamo\
**Created:** [June 9, 2020, 3:17pm UTC](https://forum.dynamobim.com/t/have-the-net-surface-area-of-the-walls-of-a-space/51623 "2020-06-09T15:17:13Z")\
**Posts on this page:** 1\
**Showing post:** 8

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**Author:** ![jacob.small](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.dynamobim.com/jacob.small/32/161030_2.png) [@jacob.small](https://forum.dynamobim.com/u/jacob.small)\
**Post date:** [June 10, 2020, 11:00am UTC](https://forum.dynamobim.com/t/have-the-net-surface-area-of-the-walls-of-a-space/51623/8 "2020-06-10T11:00:06Z")

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I go over some of the steps in this post, but as I mention there this isn’t really a great ‘first graph’ as there is a lot of complexity along the way.

> [@How to calculate % Windows Facade exterior wall for each Unit](https://forum.dynamobim.com/t/how-to-calculate-windows-facade-exterior-wall-for-each-unit/51620/2):
>
> Hello and welcome to the forum! First up, this isn’t a great ‘first graph’ to tackle as it’s got a complex data structure and will require a good amount of grouping, sorting, and filtering. Hopefully you’re ready to take on a challenge or are ‘new to the forum but not new to computational design’. Either way the community will be able to help periodically if you post your attempts and enough insight for us to see where you’re going. I’m going to assume you can easily collect the rooms which you…

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