Hope this helps.
Don Groff | REALTORÂ® & Mortgage Broker
Austin Real Estate Pros & 360 Lending Group
o 512.669.5599 | m 512.633.4157 | firstname.lastname@example.org
websites: http://www.AustinListed.com | http://www.360LendingGroup.com
Likely not too many restrictions other than boundaries (not going into easements/right-of-ways). Must be within established codes for electrical, plumbing, etc.
By the way, same rules apply inside or outside of a flood zone.
Bernstein Realty, Inc.
If you're lucky enough to find something in an unrestricted area, you'd need to comply with the current building codes. That information can be obtained from Public Works.
I hope this helps ... best of luck.