We recently moved from Dublin, Ireland to San Francisco and bought a house built in 1951. At some point, the bedrooms must have had really think shag carpeting, as the doors seem to have been cut about 2" above the floor. With small children who are asleep by 7:00 PM, noise is an issue.

I think a 1.5" threshhold would look dodgy and could trip up running children, so my options seem to be 1) getting new doors, or 2) making the existing doors longer. They are 4 matching solid wood four-panel doors, but they are all different widths.

Does anyone have any advice on options I'm not considering? If making the doors longer is the way to go, how should I proceed? I'm reasonably handy and have been thinking about investing in a table saw...