You can find new and used doors all over Craigslist. Many are cheap, flimsy, interior doors but you’ll also come across some solid gems that were removed from old homes and built from one piece. Often times the heights and widths of these older doors won’t fit into modern door frames so you’ll need to modify your existing door frame accordingly.
According to the Times Union, here’s what you need to retrofit an old door into a new space:
1. Old door – not too warped, preferably with hardware intact
2. A very good carpenter – somebody who knows how to handle a little warping
3. Non perfectionist attitude – the idea here is that it will look like it’s always been there