diff --git a/datatypes/epc/domain/mapper.py b/datatypes/epc/domain/mapper.py
index bdcbbb12..a5ea618c 100644
--- a/datatypes/epc/domain/mapper.py
+++ b/datatypes/epc/domain/mapper.py
@@ -1422,6 +1422,7 @@ def _map_floor_dimensions(floors: List[FloorMeasurement]) -> List[SapFloorDimens
             total_floor_area_m2=floor.area_m2,
             party_wall_length_m=floor.pwl_m,
             heat_loss_perimeter_m=floor.heat_loss_perimeter_m,
+            floor=int(floor.name.split()[-1]),
         )
         for floor in floors
     ]