Floor plan

For the past few days I have been laying out a floor plan for the three story home my character lives in. 

I want to make sure I have all the rooms in the right place, hidden stair, and all. 

Does anyone else do this? Am I crazy for wasting my writing time on it? 

I don’t have a group I can ask. I live to far from town. It’s just me. Pushing through. Trying to be a writer.