Building permits in Salinas go through the city's Community Development office, and whether your job needs one is their call, not ours. Before we start, I check with the city for your address, and where a permit is needed we take care of the paperwork and set up the inspections, so that step can move your start date. California contractors are licensed by the state's Contractors State License Board, and the city's permit site also lets you search contractors, so you can check who you're hiring before you sign anything.
The price moves with what's already up there and what has to happen before new insulation goes in: how many inches you have now, whether the old layer has to come out, how many gaps need sealing, and how hard the attic or crawl space is to get into. Foam costs more than loose fill, so that choice moves it too, and the schedule mostly turns on the permit check and whether removal comes first. You get your own figure from the estimate I write after I've been up there. We come over from Seaside for Salinas jobs the same way we do for houses in Marina and Prunedale, so getting out to look at yours is easy to set up.