Any time you can add an additional bath to a home it is always the better investment as far as return is concerned. In this case it would certainly be the better of the two options that you have presented. the best return is always a full bath (toilet, tub, sink) but if that is not possible the minimum should be a 3/4 bath (toilet, shower, sink). In this area, no matter the age of the home, adding a bath to a bedroom is always a good investment.
Thanks
Terry Reynolds
Windermere Oak Harbor - Fri Sep 11 2009, 16:13