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Internal spiral staircase

Looking to get an approximate price to install an internal spiral staircase for a residential property in replace of an existing internal lift. The staircase would connect the ground floor to the first floor of the property. I am looking for a spiral staircase 1600 mm in diameter which includes treadwidths of 750mm and a 100mm centre pole. It needs 15 treads and 16 risers of 200mm with a slope of 41 degrees in an anti-clockwise direction. It is approximately 360 degrees with the top landing being directly ontop / inline with the first riser coming up to step 1. Will need to be in semi-kitset form. Wooden treads and ideally metal ballastrading.