Cost of an ADU in East Bay right now?

[Sasha Josephs]

Hello! I hope everyone is staying safe out there during these unprecedented times.

I wanted to ask the community, a rough ball park figure on what it would cost to build an ADU of let's say 500 sq. ft. with one bathroom, kitchen and bedroom, for a structure that is ALREADY existing and what it would cost to build from the ground up.

I'd be grateful for any input.