Built entirely in a factory, manufactured homes are then transported to the site and installed.
Modular homes are also factory-built in sections to state or local codes.
The modules are then transported to the home site and assembled. The homes must meet state or local building codes where they are assembled. My wife and I recently made an offer, which was accepted by the seller, but it had a contingency clause based on the sale of our home with a 48-hour right of refusal. While we were out of town, we were put on notice, via answering machine, that someone made a more acceptable offer. Our agent, acting in a dual agency capacity, told us we either had to remove the contingency or our offer would be rejected.