I have one in my current room. To save space, I did a 3 door sliding wardrobe and requested one of the doors to be a mirror. In this way, I need not have to separately allocate a space for a mirror. I don't have a separate cost for it as that time I was refurbishing my room preparing for marriage, and the contractor gave me a lump sum quote. I did a bedframe with backlight, dressing table with mirror, some cabinets above the window, minor electrical work and the 8 foot wardrobe at $3500.