Expand existing septic system?

[Lisa Fryer]

Hello BP community, Does anyone have an idea on general resale value difference in a 2 bedroom vs 3 bedroom manufactured home on it's own land? The property is located in Belfair, WA. We own a lot with an existing 2 bedroom septic that we are going to place a manufactured home on to sell. We were thinking of trying to upgrade the system to a 3 bedroom. In order to do this we need to pay about $600 for a septic designer to come out and advise if this is possible. There is also a chance that due to the age of the system (1999) it may not be a possibility to expand and we may need a new system which could run $15-20K. The other alternative is to just keep the 2 bedroom septic as is and place a 2 bedroom home with an 'office'. Our real estate agent seems to think if we do this it would still sell close to what a 3 bedroom would, but I am not sure if this is true. Any advise would be appreciated. Thank you!