Turn a small warehouse located in my house's backyard in two mini apartment

I have a house in Tampa, Florida. This house have a small warehouse in the backyard that I would like to turn in 2 mini-apartments (one of two rooms and other with a single one). I need: 1. An architect in order to prepare the construction's planes. 2. A person or company in order to prepare an estimate of the work. Would be great if I get someone that could do all so we can discuss prices and get the job done as soon as possible.