Potential ADU/Cost? - Pacifica, CA

[Jonathan Lo]

Hi all,

First time poster but appreciate all the discussions happening here. We have a finished downstairs studio room (500 sqft or so) with a full bath in Pacifica, CA. Not sure about the permit status. Could this be potentially converted into a legal ADU and what would be a ballpark figure for something like this? Would we need to be concerned about ceiling height and doorway clearance?

Appreciate any info.