Where square footage is tight, sliding barn-style doors are an alternative to pocket doors. The Real Carriage Door Co. offers sliding door kits in several species, as well as in salvaged wood. The door shown would cost around $1,100 in salvaged, and $610 in alder. The 6-foot sliding hardware would be about $427. Real Carriage Door Co., 800.694.5977, realcarriage.com