There are a lot of variables.
Some of the folks here that have access to discounted or free materials and lots of skilled friends have managed a$300 roof raise.
I have not been so fortunate on the material side. I have shopped price on material from every supplier I could find within 90 miles and online.
I have purchased all of the structural metal and most of the sheet metal and rivets. Also, welding supplies, grinding wheels, flap disks, drill bits etc.
Approximate cost so far:
Welding supplies $150
Misc supplies $100
I had the good fortune of having a skilled and generous board member help with the raise so far. Sadly, his job dictated a move out of state .
There is an outfit in the Denver area that does roof raises. I have heard that they charge $10-15k but I have not confirmed that.
Take a look at: https://chromeyellowcorp.com
Good luck with your quest.