Architecture - does foundation curb count in hallway width?

I am finishing my townhouse basement which was dug out for more height. The old foundation was reinforced with extra concrete. This new concrete now sticks out about 9 in. into the floor space (horizontal), and about 6 in. up from the floor. It is like a curb around the outside walls.

I know the halls need to be 36" wide by code, but the house is very narrow. Can I count the 9" of the curb in the 36"? If I have to count 36" at the baseboard level, the hall for all practical purposes will be 45" wide, and will cause problems in the design. If I can measure from the knee-level or higher, it will be all right.

Can anyone help me?

Hi rambelmont,

You should build as is approved and sealed in your permits plans.
If you don't have permits plans, then you should visit your local Building Dept and start the process there, because local codes may vary.

Usually, codes specify the minimums and not the "general" dimensions.

If you do try to go the narrow route, lets hope you that you and none of your relatives ever need a wheelchair or a walker.

Since it is a dug out basement, it most likely is needed as an exit. If it is not adequate, the area may not be included in the livable space and the value will be less and severely limit who can qualify and what you can get for the place.

I have no idea what code you are under, but most codes are a "reality check" that can prevent mistakes.