Building tip: Move entire house to different / bigger lot

@WebGremlin said:

" - Make sure that all items crafted or improved by your Sims (paintings, improved furniture, etc) are added to the Sim's or the household inventory (crafted items won't be saved with the house, and furniture that had been improved will lose their improvements upon moving) "

By "improved furniture" are you referring to upgrading electronics, plumbing, etc?
Or is "improved furniture" something else?

Thank you!