I'm new here and I have questions:)

[Dab Chern]

I'm new here and I'm from Sacramento. We bought a house about 3-4 years ago and house was old and almost unlivable. Spent about 20k on remodeling and house appraisal went up to 40% in last 4 years. The question is: there was an old shed in the back yard. I took a permit to change siding and put some Windows and door on that shed. How can I legalize this shed as livable area? House is 1200sqf and shed is 850sqf. Size of land is .55 acres.