This has always been a point of confusion with me, especially in a city that has not been incorporated for a long period of time.
Most of the subdivisions in my city were platted prior to the city's incorporation. After incorporation, the city assigned zoning districts setting minimum setbacks that in most cases, were above and beyond those indicated on the plat/deed restrictions. Also, the zoning regs include a requirement that RVs, trailers, etc. be placed to the rear of the house & inside the side & rear setbacks.
So, if a house was built on a lot platted prior to zoning and they want to do an addition, do they have to comply with the zoning setbacks or can they stick to their lines on the plat?
Here's my next question that's more along the lines of code compliance: If the house built prior to incorporation was done in such a way that it would be nearly impossible to locate RVs to the rear as stated in the ordinance, does the ordinance still apply? Right now I'm assuming yes, but I'm just trying like hell to avoid having to do all the damn variances that we're about to deal with (and a public relations nightmare from telling people where they can & cannot put their stuff).