You don't get it, do you? The whole series revolves around Danny, Jessie and Joey raising the three girls DJ, Stephenie, and Michelle. If Joey and Jessie had to work in the office, then the show would have been over since there would be no reason to continue with the show. Anyway, if Joey and Jessie's boss said they had to work at the office or they couldn't work at all, I don't think Joey and Jessie would take the job. They would have said something like "Thank you very much for the oppertunity, but we are not ready for a full time comentment." However, I think Joey and Jessie's boss really liked them and thought they were valued employees and didn't want to lose them. He probably figured that if it makes Joey and Jessie happy to work at home, then so be it.
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