We have been involved in thousands of Factory Built Housing projects and developments during this time and understand all the nuances and challenges that one may incur during this process. It's not always as difficult as it was purported to be in a previous comment. In fact the process if done correctly can be quite painless and expeditious.
If you are considering placing a Factory Built Home on a private lot/parcel it would certainly behove you to select a "Modular Home" vs a "Manufactured Home" for the simple reason that you can use comps from other homes quite close to you be they "Modular" or "Sight" Built.
With a "Manufactured Home" you may only draw comps from other "Manufactured Homes". So if there are no Manufactured Homes in the immediate area the appraisers my find themselves searching outside the neighborhood you are seeking to build in. Sometimes the closets Manufactured Home is in a MH park/community which could be a lease/rental park/community. This obviously would not bode well for your appraisal.
What's worse most folks won't even find this out until they attempt to replace the construction loan with a "take out loan" (long term financing). I've seen some devastating scenarios result from this situation. Should the appraiser not be able to find local comps and need to rely on a Manufactured Home in a rent/lease park your home would never comp due to inadequate lone to value. Folks have had to literally walk away from the entire project losing everything they've invested. Believe me you will be much better off with a "Modular Home"
However, if the lot/space/parcel is located in an existing MH park/community then you would be able to select a Manufactured Home without much concern providing once again that the park/community is in the path of progress and that there aren't too many older homes which would not bode well for your resale value.
I still have a lot more information for you should you wish to contact me direct on my cell at 760 815-6977 or email me at email@example.com.We are the go to Factory Built Housing Specialists in San Diego.
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I have several other questions and suggestions but this information would be very helpful to me in determining a qualified and knowledgeable answer for you