tractor888 said:
I tried to google for an answer but didn't find anything that I can understand. What is the tolerance of a property line survery? It can't be exactly on the sport right? Is it a +/- a few inches? a foot or +/- a certain percentage of tolerance like any type of scientific measurements?
To answer your question, yes, a survey can be that accurate. It can be more accurate than 3 inches. When doing a survey, you start at a point and follow the deed around the property. The goal is to end up EXACTLY where you started. If you do, the deed 'closes'. So, yes, you can end up EXACTLY where you started. You can end up within 3" of where you started. Coming within 3" might be great accuracy in a 50 acre parcel, but not good enough in a 1/4 acre suburban subdivision parcel. You've never answered how large these parcels are.
The first step in doing a survey is to get a copy of the deed. You enter the directions and distances into a computer program and determine if the description is accurate, i.e., it closes. It's not unusual to find out the description in the deed doesn't close. Generally speaking, the older the deed, the more likely it wont' close.
The next step is to go into the field and find all the points described in the deed. Where do you start in the field? In cities, there can be brass markers in sidewalks. These are the best places to start a survey. In the suburbs, you look for concrete markers, iron pipes, rebar, or other landmarks. These markers can be on the property being surveyed, on adjoining properties, in the street, etc. The more permanent, the better. In the country, such markers can be hard to find, if they are there at all. Sometimes the deed says something like, "Starting from a point in the middle of Brown Street, 54' 3" from...". The key is to start from an accurate point. Sometimes you find good points to start from, sometime you don't. Sometimes when you do find points, they can be farther apart than the deed indicates or closer. So what is correct? What happens if the deed doesn't close and the measurements taken in the field don't close. Which is right?
In such cases, the surveyor can pull deeds from adjoining properties. Depending upon how many adjoining properties there are, the date of the deed, the last time a survey was done, etc. this can take a long time, and you pay for it. Oh, this dispute will go to court, now the surveyor has to be able to document and justify why he chose to believe the deed of one adjoining deed instead of another.
That's why a survey can cost a lot or a little. Unless we knew where the parcel was located, we could only quote a range for the cost of a survey. Cities, suburbs, subdivisions and small parcels were less expensive to survey than large parcels in the country.