Unpermited garage closure

[Charles Burkeen]

So, I am looking at a house that is listed as ~1500 sq ft. it has an enclosed garage that I am sure was not permitted as the house would be close to 1950 sq feet. However, It is listed as 4/2 which is including the closed in garage.

If I purchase this house is it possible to get a retro active permit and be able to sell it as a 1950 sq ft house? 

Will the extra 400 sq ft cause the price of house to rise at say 400 x 70 per sq foot? 

Or will it just cause the sq footage price to go down.

[Jason Hirko]

@Charles Burkeen Where is it located? In Texas each municipality is different