So, create status codes for both of these and a few in-between codes to help you work smarter, not harder.

They will let you know what you can and can't do without a permit and what you are able to do yourself within the scopes of those permits.My concern is because this is a rental, if you do anything that is not to code and the tenant reports it, you will likely have some much bigger issues to deal with.Given you note this is major rehab, I tend to lean to hire most, if not all, out. 

The other property is a cottage built in the mid 70s and requires significant electrical/plumbing work to bring up to code.

Please suggest top cities/zip codes to look for in 2025 based on your experience.

Get headcount by googling thetown or zip code.

Successful flippers are:- Building relationships with reliable contractors- Ordering materials well in advance- Being strategic about which renovations will truly deliver ROI Regulatory EnvironmentRecent changes to Phoenix building codes have emphasized:- Stricter energy efficiency requirements- More rigorous inspection processes- Additional permits for certain types of renovationsBe prepared for longer permitting timelines than in years past.Financial ConsiderationsThe financing landscape has evolved significantly:- Hard money lenders are offering more competitive rates (7-9%) than the 12-14% seen in 2022- Several Phoenix-specific investment groups have emerged that pool resources for flips- Traditional lenders now offer more renovation loan products tailored specifically to the Arizona marketThe Bottom LineThe Phoenix market in 2025 offers solid opportunity for house flippers who approach projects strategically.

When changing out a window for a bigger one, be certain to know the city codes.

However, there are tax code changes every year.

Those tend to be the neighborhoods that are gentrifying.Unique stuff to Pittsburgh I would say is don't go based on zip codes since one zip code can be composed of multiple different areas/neighborhoods.

build it instead of buying it. especially in the 5-50 range you are going to get garbage that's 80-120 years old in c neighborhoods. i can find land in almost any zip code and make the numbers work in columbus. or partner on a project locally. just my 2 cents but build to rent is much stronger right now in my opinion in columbus than buying existing assets