surface mount outlets
When my house was built, the wiring plans called for the installation of one 20A outlet in the garage with exposed studs. For cost reasons, I left things be, because I know how to do basic wiring, and was planning to daisy-chain additional outlets around the garage. Much to my dismay, the local building codes had changed, and the garage was drywalled. Short of cutting drywall, is it permissible to replace the existing in-wall outlet with a surface mount box, and then daisy chain additional surface mount boxes around the garage, connected by conduit?