What is a flag lot? A flag lot is is a lot that has no direct street frontage. The lot is accessed by a driveway, usually down the side of another house. The picture highlights a flag lot.
490plat
There is no direct method to search out flag lots (or exclude them from) an RMLS search so analysis about them is tough. I expect that we’d find that the flag lots have a lower value than the equivalent home with curb frontage. The flag lot allows for higher density by splitting existing lots and getting lots in developments where curb frontage is not possible.

The disadvantage for the house on the curb is that anyone wanting access to flag lot has to pass by the edge of their house. In some cases the drive may be shared by easement. The disadvantage for the flag lot is that there is no curb appeal as there is no curb. The advantage for the flag lot is that there should be minimal street noise (depending what is in the back yard) and the sales price should be a little lower than the same house on the curb.

I’d be curious to hear people’s experience living in either the curb house or the flag house.