Welcome

That's a big question, Labor & Industry is state wide and handles a variety of  projects. However some cities do their own thing, to learn more here's the L&I website   https://www.lni.wa.gov/

That's entirely up to you, homeowners can pull permits for their own work. It still has to meet the same standards as a licensed  and bonded professional. If you'd like to learn more, call WIlly from Zeus Electric at 253-569-5627

Who knows? Everyone charges differently for different projects.  Always get a few estimates if you can, and when you decide on a contractor, don't forget to go to the L&I website and verify their information.