Well, we learned a lesson in avoiding installation of a new septic system. If you plan to add a room to your home that will not initially or immediately be used as a bedroom, be sure to make it look like something other than a bedroom! We moved into our new office a week and a half ago. While we intend to use the second room we built as a guest bedroom, we had told the inspector way back when that it would NOT be a bedroom, but more of an office/rec room that would be supplemental to the actual office. We did this because he told us that there may be implications in adding a 4th bedroom to the house. Well, we didn't realize those implications involved determining if the septic system was approved for a 4 bedroom house. Likely not, since the house was built in 1976 as a 1400 SF 3 BR rancher. So, being a kind man, the inspector has decided to overlook the bed frame we had in the room, and told us to make sure it resembled an office when he returned to re do the final inspection. So, we will not put the closet doors on, and we will put office shelving and a file cabinet in there; we have a desk and a TV stand rather than a bed in the room. So, take our advice, and be sure to know what the type of room you're uilding might do to your existing utility capacities!!