I did the same thing in 2005, with about the same square footage - one bedroom, one family room and one bathroom, as well as a storage room/furnace room.
I paid a guy to do it and it was only $24,000. He did a good job. Other quotes were as high as $40,000 for the same thing.
Don't bother with permits. You'll just have to pay more in taxes every year on top of the cost of the permits.
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