Blessings for placement of Mezuzah
What is the blessing to be recited prior to affixing a mezuzah?
Prior to affixing a mezuzah upon a doorpost (which has a door), the following blessing should be recited:
ברוך אתה ה׳ אל־ה־ינו מלך העולם אשר קדשנו במצותיו וצונו לקבוע מזוזה
Hebrew transliteration: Baruch Ato A-do-nai Elo-heinu Melech Ho-olom asher kideshonu b’mitzvotov v’tzivonu likboa mezuzah.
Translation: Blessed are You, L-rd our G-d, King of the universe, who has sanctified us with His commandments and commanded us to affix a mezuzah.
Although many mezuzahs will be affixed, one does not recite "Likboa Mezuzot" (in the plural).
How many blessings do I make when I am not putting up all of the mezuzahs at once?
If more than one mezuzah is being affixed at one time, only one blessing is recited. However, if you will put them up on separate days, additional blessings will be required on each day.
One should also refrain from talking until all the mezuzahs are mounted.
Does the blessing “Shehecheyanu” need to be recited?
No. The blessing “Shehecheyanu” is never recited when affixing mezuzahs.
Are there any doors that require a mezuzah but do not require a blessing?
No blessing is recited when affixing mezuzahs to:
• Entrances of garages and storage rooms
• Doorways or archways that have no actual doors
• A room whose length is less than four cubits, but the total area is at least sixteen cubits square. (i.e. 4 x 9 1/2 feet or 3 x 12 1/2 feet)
In all the aforementioned, the blessing should be recited whilst affixing a mezuzah to an entrance that has a door, such as an exterior entryway or bedroom door. The mezuzahs remaining are afterwards placed on the archways, etc.
Blessings are also not recited on mezuzahs:
• If the rooms are shared with a non-Jew
• At one’s workplace
Do I recite a blessing when remounting the mezuzahs?
Recite the blessing only if the mezuzahs were off the doorposts for at least one night. If when you’re remounting the mezuzahs, you are also adding new mezuzahs, it is then preferred to recite the blessing on the new one (providing that it is mounted on a door that requires a blessing).
What if I drop a mezuzah on the floor, G-d forbid?
One who drops a mezuzah, G-d forbid, is not obligated to fast as in the case of a dropped Sefer Torah.
Am I required to recite a blessing when remounting a mezuzah after it falls off from the doorpost?
Yes. This applies even in a case when the mezuzah is affixed immediately after it falls down.
All our measurements in this book follow the opinion of R’ Chaim Naeh. According to other opinions the measurements are longer and will therefore be a more lenient opinion in regards to the size of a room that requires a mezuzah.
According to R’ Chaim Naeh
10 handbreadths (‘TEFACHIM’) = 81 2/3 centimeters.
Approximately 31 1/2 inches
4 cubits square (‘AMOT’) = 196 centimeters square
Approximately 6.6 feet x 6.6 feet