Hello Ray, the shaker style closet doors are 18 inches each. the glass door on the right was 38 inches. The price does range a bit based on size starting around $150 and up.

I'm super interested in the doors as well! They're beautiful, and exactly what we're looking for our master closet/bathroom door. Super clean! Do you manufacture the doors in-house? If not, would you mind telling me the supplier?

Jeld Wen makes 5 panel doors like this if you haven't already found them. You can get them in either solid or hollow core, primed or painted. You could get the two 18" by ordering a 36" bifold without bifold hinges:)