There are several reasons why you might consider;
1. You do not want the delay and hassle in applying for building permits.
2. You want a quick and easy solution to your housing needs.
3. Your land is in a flood prone area and buildings are permitted.
4. You want a home that is affordable, and can be easily delivered on-site. Additionally having the option to be just as easily relocated again in case your circumstances change in the future.
5. You want quality and value for money.