A. All doors of any decent sized room (area of 6’x6′) which we inhabit: live, sleep, work or eat. Exceptions include the bathroom, a barn, rooms exclusively used for storage, or temporary places lived in for less than 30 days. The basic Mezuzah costs about $27 (as it must be handwritten meticulously by a scribe with quill on parchment) so some people put them up only at the front door and on the kitchen. Mezuzahs offer “great protection” and welcome G-d into our home. The Mitzvah of Mezuzah comes from the Torah portion of “Shema” (Hear O’ Israel) – which is written in the Mezuzah scroll.