A building line is a distance from the street or edge of your lot that you cannot build in. A building line can be in the front, side and rear yards. You can find building lines by looking at your property survey or the title policy you received when you purchased the property. For example, if you see a line running accross the front yard on your survey that says building line, you cannot build between that line and the street in front of your property. You can only get permission from your local municipality to build beyond the building line if the municipality was the body who placed building lines on your property. If your developer created the building line when he filed the plat of subdivision with the county, and your neighbors have not violated the building line, then most likely you will not be able to build beyond that line.