Not really illegal or a problem
It's just costs really vary widely on hiring someone
What might cost $1k in one area will be $2k somewhere else & $3k in another area
Plus a lot of these you need to see the existing installation in order to properly estimate cost
Get atleast 3 Estimates electricians are out of work and you might get a good price make sure they are bonded and insured and get permits Try to get free Estimates if they want the job bad enough they will.