Should switch cover plates be installed before final inspection?
Usually they do require the cover plate to verify the box is set correctly.  Each inspector is different but some don't like DIY folks, especially in Lane County, Oregon. Benton &amp; Linn counties were not so bad (I haven't worked up in Portland for ~15 years) but they usually want everything finished. I have seen inspectors fail an install because the wires were coated with sheet rock mud &amp; paint.