If you break your TV on purose you aren't getting your money back.
in real life you can move things without having to buy them again.
if this mod is to work correctly without getting money back, there should be a special mode in which you can build your structure and the bricks stay as ghost bricks, and then you can confirm whether you would like to build this structure or not...though, i'm sure this would be a bit complex.
this still would be good for making sure you don't make mistakes, rather than if you were to make a pop up dialog asking if you're sure every time you plant a brick.