To rotate a house in build mode first click on the four arrow button and select House. Then click on the house. You will see that the entire house is selected and a tool appears that let you rotate it or move it.
This is an high concept guide on how to do this. If you are not an expert at these tools this can be a very taxing accomplishment. It was not easy to find nor complete. I'll try to get a step by step guide in the future.
I finally found out how to do this. The lot I wanted had a house and family on it.
First save your game as is so you can load it back to the original game in case you make a mistake.
First, go to the world where you pick the family you want to play. If you want to keep them make sure they are in the saved households. If not, save them if they are not there.
I liked the house so i also played that family on that lot.
Click Build mode
Click save to my library (middle nav bar with an arrow pointing to folder)
Click Save lot.
Click save to my library in the bottom right of the screen.
Once you have the family and original neighbor house saved....
Make sure your house is also saved, you'll have to get into your family and house and do the same.
Now to move the house.
Go back to the main menu.
Go into build and then Bulldoze the lot.
Evict the family,
Now visit that lot with your current family.
You'll have to go into the gallery and select your saved house and place it on the lot.
once the house is placed, you'll have to move into it.
Now once you have the house on the lot you can now select the move tool, and then the rotate works properly. The one thing they do not mention in other posts is that the move and rotate tool only works in the property in which you have selected. You cannot move to an actual different property unless you go through these steps.
