Which Side of the Door Do You Put a Mezuzah On? (Right Side Explained)

When someone asks which side to put a mezuzah on, the answer is clear and firm: the right side of the doorpost, as you enter the room. This is not a preference or a custom that varies by community. It is a binding halachic requirement that applies to every doorway in every Jewish home. Understanding why, and how to apply this correctly in different doorways, helps us fulfill this precious mitzvah correctly.

Which Side of the Door Do You Put a Mezuzah On? (Right Side Explained)

The mezuzah is placed on the right side of the doorway as one enters. The right side is determined by the direction you are walking as you enter the room, not as you exit. You stand in the doorway facing inward, and the right side of that passage is where the mezuzah belongs. This applies to every doorway that requires a mezuzah, from the front door to interior room entrances. Where the direction of entry is straightforward, the placement is straightforward as well. Where the doorway serves two spaces and the direction is less obvious, the practical ruling may require further halachic analysis.

How to Apply This in Practice

For most doorways, determining the correct side is straightforward. The mezuzah is affixed on the right side of the one entering (kove’a b’yemin hanichnas). In a simple doorway, that usually means: stand where a person normally approaches the room, and the mezuzah belongs on the doorpost to the right as one enters. It should be affixed to the doorpost itself, within the vertical space of the doorway, in the upper third of the doorpost’s height.

For apartment interiors with many doorways, that basic rule still applies, but the direction of entry is not always determined by a quick glance alone. In many ordinary room-to-room cases, you place the mezuzah on the right side of entering the room. But where usage is unclear, or where traffic moves naturally in both directions, the direction of entry may require more careful analysis.

When a house is divided into two rooms with a doorway between them, the halachic discussion of heker tzir can become relevant. In the classic case cited in Shulchan Arukh, the hinge-side indicator helps determine which side is treated as the direction of entry. But this is not a blanket rule for every interior doorway, and it should not be presented too broadly. For questions about interior room direction, especially where room function and doorway swing point in different directions, a rav should be consulted.

If you have an extended doorpost or a very deep door frame, additional considerations apply regarding exactly where within the doorpost space the mezuzah should be fixed. These are not rare situations, and they are worth addressing carefully.

What If the Mezuzah Was Placed on the Wrong Side?

This is a real concern. The Shulchan Arukh rules that the mezuzah must be placed on the right side of the one entering, and that placing it on the left does not fulfill the mitzvah. If a mezuzah was affixed on the wrong side, it should be removed and reaffixed correctly on the proper side.

More practically, this means that someone who discovers that the mezuzah has been on the wrong side has not been fulfilling the mitzvah properly during that period. That is a reason to correct the placement promptly.

The Slant: A Related Practice

Many people notice that mezuzot in Ashkenazic homes are placed at a diagonal slant rather than fully upright or fully horizontal. This practice arises from a dispute brought in the Poskim: one opinion requires upright placement, while another requires horizontal placement. The Rema writes that those who wish to satisfy both opinions place the mezuzah at a diagonal (alakhson), and this became the accepted Ashkenazic practice.

Sephardic communities generally follow the ruling of the Shulchan Arukh and place the mezuzah upright. Each practice follows its own accepted mesorah and psak. What does not change is the side: the mezuzah goes on the right side of entry.

Height and Position Within the Doorpost

While this article focuses on which side, the height of placement also matters. The Gemara teaches that the mezuzah should be fixed at the lower portion of the upper third of the doorpost. The Rambam and Shulchan Aruch rule that if it is placed below the upper third, it is invalid. The Shulchan Aruch indicates that placement higher than the beginning of the upper third can still be valid under certain conditions, so long as it is not too close to the lintel.

The Deeper Meaning Behind Entering on the Right

The mezuzah contains the parshiyot of Shema and Vehaya im Shamoa, so it stands at the doorway as a constant reminder of Hashem’s unity and of our obligation to live by His mitzvot. The placement on the right side of entry is a significant part of the halachic form of the mitzvah.

Key Takeaway

The mezuzah must be placed on the right side of the doorpost as one enters. This is a halachic requirement, not a mere custom. Placing it on the left side does not fulfill the mitzvah. The right side is determined by the direction of entry, though in more complex cases the analysis may involve room function and, at times, heker tzir. The mezuzah must also be placed in the upper third of the doorway, but not within the top tefach (handsbreath). When the case is unclear, especially with interior doorways, unusual frames, or competing indicators, a rav should be consulted.

A Word About Kosher Mezuzah

At Kosher Mezuzah, every mezuzah scroll we sell is written by a qualified sofer and checked by a trained magiah. Our scrolls are certified through a process endorsed by the Orthodox Union, one of the most trusted kosher certification bodies in the world. Each scroll comes with verifiable information about who wrote it, who checked it, and the materials used, so you can fulfill the mitzvah with genuine confidence.

Proper placement on the right side matters only if the scroll inside is kosher. A mezuzah affixed on the correct side but containing an invalid scroll is no fulfillment of the mitzvah. We take the kashrut of every scroll seriously because the mitzvah deserves nothing less.

If you have questions about which side to place a mezuzah in a particular doorway in your home, or if you want to verify that your current mezuzot are properly positioned and halachically valid, we are here to help.

May your home be filled with the protection and blessing that comes from fulfilling this mitzvah properly, and may the zechus of the mezuzah bring shalom and beracha to all who pass through your doors.