upgrade Modular house

[Diane]

I would like to upgrade my modular house
Can anyone please help? I own a modular house and do to financing options I was wondering if it would (for loan purposes modular homes are @ a higher interest rate) be possible to upgrade to a standard house by say:
Making permanent attachments to the foundation
Upgrade of plumbing
Stucco @ the exterior
Etc.
Does anyone know of any sources for information that may help??
I live in Acton CA. (L.A. County)
Thank you
Diane
[email protected]