The building line is the line which has been set with regard to the frontage of any land parcel or plot and this is fixed via any contract, deed or any legal statute. Beyond this, the land owner cannot undertake development/construction. A setback is the minimum distance where any structure/building should be set back by this amount from any road/street, or any other stream/river, flood plain/shore or any other location. Aspects like fences, tanks, hazards, and landscaping will be regulated by these setback lines.
The building setback line or BSBL indicates any line, beyond which any structure foundation shall not venture or extend. This is the basic meaning of the term- building line or setback. The land owner or property owner has to thus keep this line in mind while extending any property.
The building setback line is crucial for the real estate sector. There are specific requirements which are contained in the City Zoning Code as well. Land and building owners have to abide by these statutes for developmental purposes and extensions.