wood door installation cost
1 It can cost $200-$500 for a solid wood door, and $500-$1,000 or more for a more decorative interior door in high-end wood like walnut or mahogany.2  For example, Lowe's store brand ReliaBilt 30. 3  Wide 6-Panel Hollow Composite Door Slab costs about $33. Bi-fold doors (two hinged panels that fold together, often hung in pairs) start at about $25-$150 in hollow core wood composite, but larger, solid wood bi-fold doors with stylish accents can cost $600-$1,500 including installation.