I drew the floor plan on autoCAD from measurements taken. Including where the owner would like to place furniture.
I then put the floor plan into rhino and extruded the walls to the measured height. Including gaps for doorways and windows at the right height
I finished by putting the walls into Unreal Engine, placing the furniture, windows and doors, texturing everything and setting up the lighting.
These are examples of 3 different renders I did from different angles with different textures/materials.