Spiral staircase needs replacement in a new 2 flat to comply with

[Atul Mohlajee]

I am planning to bid on a 2-flat.  The second unit has two floors one of which is a loft.  Spiral stairs connect the main floor (2nd) of two flat to the loft.  Village wants spiral staircase replaced by a staircase as per code.  Is it too big a repair to take and will it need permits and a licensed contractor etc.

Thanks.