This. I’m a civil engineer and work with surveyors on a daily basis and it’s pretty much a sure thing that every municipality will have a setbacks established within their zoning code. By set backs I mean how many linear feet from the side, front, and back portions of the lot you can build a home.
I’m also curious if the AC unit and the concrete pad it sits on were built after the home was originally constructed? I would imagine if it was built when the house was originally constructed they would of been sure to build it on your property and not someone elses.
And to whoever was talking about bench marks being used as driveways - what our surveyors typically run benchmarks off of are physical locations and elevations that are guaranteed to not change over time (a nail on a utility pole, or a nut on the top of a hydrant). Considering driveway elevations could deteriorate over time (asphalt goes to shit, someone repaves a driveway) I would have a hard time believing you’d be able to pull a benchmark off a driveway.
If you’re interested in going balls out and getting a legit survey feel free to PM me, although my company doesn’t typically do single lot surveys we have several companies we refer people to who are reasonable in price and will give you a good product.