If you have the funds you then should try and add a master suite to your house. Whilst having a nice big bedroom is excellent it would dramatically help during resale when the bedroom area comes with a bathroom and/or a sitting area. The majority of buyers tend to lean toward houses that have already master suites.
When you have a tiny washroom, consider finding different methods to save space as your next redecorating project. It is possible to use an adjacent closet or to reformat an existing kitchen cabinet into a new storage facility for the bathroom. Always be certain not to eliminate any structural support the room has.