Blender Floor Plan. However stop there on step 3. This plane can have any orientation you like.
Small eevee animation included. Assigning color Subdividing Extruding. It already has everything you need to make any kind of graphics or architectural visualisations including 3d floor plans like this.
Most credit to this blog.
Blender 28 speed modeling video showing you the complete process behind creating a 3d floor plan with amazing details. Blender egnevadesigns Texturing and Lighting part. With the floor plan layout made in Blender you can quickly move to a 3d visualization of the interior. 3d floor plan modeling in Blender.