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Exterior Wall Placement: Outside, Center, Inside — RoomSketch3D

How Exterior Wall Placement works in RoomSketch3D and how it changes your Gross and Usable area. On a 16×12 rectangle, toggle Outside, Center, and Inside and watch the dimension chains and areas update (224/192 → 207/177 → 192/163).

1 minUpdated 2026-10-11
Read the full step-by-step guide

What this video covers

  1. 1First: how the plan measures
  2. 2Gross Area vs Usable Area
  3. 3Outside mode: the outline is the inside
  4. 4Center mode: walls straddle the line
  5. 5Inside mode: the outline is the outside
  6. 6Putting it together
  7. 7After the walls exist: typing a wall's length

Prefer to read along? See the full written walkthrough with screenshots.

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