That issue is governed by local law. You need to call your town clerk and ask that question.
Typically you are not to build a fence anywhere past your property line.
how far off the property line do you have to be for a house addition in susex county delaware
I'm not sure there are any restrictions to where you build on your property. You can build right on the edge of your property line if you want, though most people like to have a little bit of yard all around the house.
It depends on the setback requirements in the property's zoning. If it's zoned, the zoning regulations will state how close any part of the building can be to the property.
How far does an above ground pool have to be from property line in the town of brookhaven
The fence cannot be outside your property line.
You need to contact the town clerk's office and inquire about building regulations for your particular town.
That depends on how close to the property line you are allowed to build, how far from the street does the house need to be, if there are any easements on the property and the maximum number of floors for which the area is zoned.
Normally, there are laws regarding easement requirements. If a person applies for a permit to build a new garage, the inspector will know the answer to your question based upon the laws where you live. As far as structure and stability goes, if you have a roof on your garage, there wouldn't be any way your neighbor could "use" your wall to support their garage, without modifying your garage, which is most likely against the law.
If not prohibited or limited by zoning, covenants(rules and regulations, usually within a development), you can build a fence on your own property. If you mean to ask whether the fence can straddle the line if the neighbor does not agree, then the answer is "no". In most jurisdictions, after enough years have passed, fences will often "become" the property line and "trump" the survey or deed line. Therefore, its important that you are not giving away property by setting the fence too far in on your line.
Zoning rules vary from state to state and community to community. You will have to check your local ordinances. In New Jersey it is 10 ft. The default in Michigan is 15 feet on the sides and 30 feet on the front and back.