Next select “Extrude” from the “Edit Geometry” submenu and write 1.0m. Then, with the same selected faces, pick “Extrude” by 1.0m. Finally extrude again by 0.35m.
You should now have something similar to image.
Now we will make the door and window openings. Select the faces as shown.
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And extrude them until they reach the other side of the wall.