I truly think you misunderstood what he said.Here is what the law statesProperty Code Sections 5.069 and 5.070.

It’s very much a gray area—not expressly permitted under most zoning codes, yet rarely enforced unless a complaint is made.

Any specific Indianapolis code/permit issues to be awareof?

Very hard to say this needs to be done since there is no standard or code to enforce.

In CA building codes are revised frequently, electricians must take "on going education " & test & re-certify with the state annually.

In Alabama, pair online with on-the-ground: pull niche lists from your county data (pre‑foreclosures, code violations, probate, tired landlords), then work them with a simple weekly rhythm: call, text, mail, and drive for dollars to verify distress.

Quote from @Ian Hutton: @Joe VilleneuveI agree actually that zip codes can be misleading in terms of a neighborhood by neighborhood basis.

I am generating 3,500-4,000 leads PER DAY across 6,513 zip codes in 100 markets and they come straight from the courts, trustees, sheriffs etc. 

Contacted the township and they stated aslong as everything is up to code, permits pulled and inspected its fine with them.

Buy & holdBuy & hold in which zip codes?