diff --git a/src/bonsai/bonsai/core/spatial.py b/src/bonsai/bonsai/core/spatial.py
index 8765493d4c..43e680cb74 100644
--- a/src/bonsai/bonsai/core/spatial.py
+++ b/src/bonsai/bonsai/core/spatial.py
@@ -178,7 +178,7 @@ def generate_space(ifc: tool.Ifc, model: tool.Model, root: tool.Root, spatial: t
     if not space_polygon:
         return
 
-    bm = spatial.get_bmesh_from_polygon(space_polygon, h=h)
+    bm = spatial.get_bmesh_from_polygon(space_polygon, h=h, polygon_is_si=True)
 
     mesh = spatial.get_named_mesh_from_bmesh(name="Space", bmesh=bm)
 
diff --git a/src/bonsai/bonsai/core/tool.py b/src/bonsai/bonsai/core/tool.py
index f1dc7f4d12..afa5cd2418 100644
--- a/src/bonsai/bonsai/core/tool.py
+++ b/src/bonsai/bonsai/core/tool.py
@@ -930,7 +930,7 @@ class Spatial:
     def get_purged_inner_holes_poly(cls, union_geom, min_area): pass
     def get_poly_valid_interior_list(cls, poly, min_area, interiors_list): pass
     def get_buffered_poly_from_linear_ring(cls, linear_ring): pass
-    def get_bmesh_from_polygon(cls, poly, h): pass
+    def get_bmesh_from_polygon(cls, poly, h, polygon_is_si=False): pass
     def get_named_obj_from_bmesh(cls, name, bmesh): pass
     def get_named_obj_from_mesh(cls, name, mesh): pass
     def get_named_mesh_from_bmesh(cls, name, bmesh): pass
diff --git a/src/bonsai/bonsai/tool/spatial.py b/src/bonsai/bonsai/tool/spatial.py
index 0c012977b3..ec33e79597 100644
--- a/src/bonsai/bonsai/tool/spatial.py
+++ b/src/bonsai/bonsai/tool/spatial.py
@@ -893,14 +893,18 @@ class Spatial(bonsai.core.tool.Spatial):
         return poly
 
     @classmethod
-    def get_bmesh_from_polygon(cls, poly: Polygon, h: float) -> bmesh.types.BMesh:
+    def get_bmesh_from_polygon(cls, poly: Polygon, h: float, polygon_is_si: bool = False) -> bmesh.types.BMesh:
+        """
+        :param h: Height, in meters.
+        :param polygon_is_si: Should be True if `poly` is defined in meters.
+        """
         mat = Matrix()
         bm = bmesh.new()
         bm.verts.index_update()
         bm.edges.index_update()
 
         mat_invert = mat.inverted()
-        si_conversion = ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
+        si_conversion = 1.0 if polygon_is_si else ifcopenshell.util.unit.calculate_unit_scale(tool.Ifc.get())
         new_verts = [
             bm.verts.new(mat_invert @ (Vector([v[0], v[1], 0]) * si_conversion)) for v in poly.exterior.coords[0:-1]
         ]