Use Unreal Engine units as centimeters
Set a consistent scale before building anything
Use a standard human scale reference, such as 180 cm tall
Make wall height a multiple of your modular grid
Common wall height: 300 cm
Common wall thickness: 10 cm to 20 cm
Common wall width: 100 cm, 200 cm, or 400 cm for modular pieces
Keep all wall pieces snapped to the same grid size
Use powers of two or clean metric values for modular dimensions
Match wall dimensions to door and window sizes
Common door height: 210 cm to 240 cm
Common door width: 90 cm to 120 cm
Common window sill height: 90 cm to 110 cm
Keep pivot points aligned to edges or corners for easier snapping
Build walls to exact measurements, not arbitrary values
Check wall scale in the Static Mesh Editor before placing
Apply transforms and reset scale on imported meshes
Use collision that matches the wall dimensions
Keep wall thickness consistent across the project
Use the same wall module sizes for all interior and exterior walls
Test wall scale against a character blueprint
Avoid non-uniform scaling on placed wall meshes
Use grid snapping in the viewport
Align wall tops, bottoms, and corners to the grid
Verify scale in centimeters when importing from DCC tools
Use real-world measurements for believable level design
Keep modular wall pieces compatible with floor and ceiling heights