The best 4-unit apartment mailbox depends on how it will be installed and whether residents need individual locking compartments. The Salsbury 3504ASU is a surface-mounted four-door option, while the 3504SRU and 3504ARU are recessed choices. The list also includes a three-door Salsbury model and a single curbside mailbox; these may suit different needs but are not direct four-unit replacements.
| Product | Configuration | Best suited for |
|---|---|---|
| Salsbury 3504ASU | Four doors, surface mount | Buildings needing surface installation |
| Salsbury 3504SRU | Four doors, recessed mount | Recessed installations needing specified compartment details |
| Salsbury 3504ARU | Four-unit recessed model | Buyers prioritizing a U.S.-made listed option |
| Salsbury 3503ARU | Three doors, recessed mount | Three-resident setups or buyers comparing unit counts |
| adoorn Modern Large | Single post-mount mailbox | One household needing outdoor mail and package capacity |
Salsbury 3504ASU Four-Door Surface Mailbox
Best for: Apartment buildings that need four mail compartments and a surface-mounted configuration. The product listing identifies it as an aluminum, powder-coated mailbox with four doors and surface mounting. It is also listed as made in the United States.
Choose this model if the installation calls for a surface-mounted unit rather than a mailbox recessed into a wall. Its four-door layout matches a four-resident or four-unit setup more directly than the three-door model in this selection.
Consideration: The supplied product details do not specify compartment dimensions, lock type, or mounting hardware. Confirm those requirements and the intended installation location before choosing it.
Salsbury 3504SRU Four-Door Recessed Mailbox
Best for: Buildings with a recessed installation that need four separate compartments. The listing states that this model is manufactured to USPS-STD-4B+ specifications. Each compartment is listed as 5-1/2 inches wide, 16-1/4 inches high, and 6-3/4 inches deep.
The product details also specify a 5-pin cylinder cam lock for each door and two keys. Those listed dimensions and lock details make this a useful option for buyers who need to compare compartment size and access hardware before purchasing.
Consideration: This is a recessed-mounted model, so it may not fit a surface-mount plan. Check the listed dimensions against the available wall opening and installation requirements.
Salsbury 3504ARU Recessed Four-Unit Mailbox
Best for: Buyers seeking another recessed Salsbury option for a four-unit arrangement. The product name identifies it as the 3504ARU recessed model, and its listed feature states that it is made in the United States.
Compare this model with the 3504SRU if both are being considered for a recessed installation. The supplied details for the 3504ARU are limited, so the 3504SRU has more explicitly listed information about compartment dimensions and locks.
Consideration: The available product details do not state this model’s compartment size, lock specifications, or mounting hardware. Verify these details with the listing before buying.
Salsbury 3503ARU Three-Door Recessed Mailbox
Best for: A three-unit building, or a buyer who is comparing Salsbury’s recessed designs before deciding how many compartments are needed. The listing describes three doors, recessed mounting, USPS access, and aluminum construction.
This is not a four-door mailbox. It is included as a nearby configuration for properties with three mail recipients or for buyers who may not need four compartments. Its recessed format can also be compared with the listed four-door recessed models.
Consideration: Avoid this model if four separate compartments are essential. The supplied details do not give compartment dimensions or lock specifications.
adoorn Modern Large Post-Mount Mailbox
Best for: A single household that wants an outdoor, post-mounted mailbox with room for letters and some packages. The listing gives dimensions of 9.5 by 9.5 by 20.75 inches and describes galvanized steel construction, a powder-coated finish, sealed edges, a sloped roof, and magnetic closure.
The listing says it can hold packages up to 16 by 8 by 7.5 inches and identifies it as USPS Postmaster General Approved. Its weather-oriented design may be useful for curbside use where a single mailbox is needed.
Consideration: This is one mailbox, not a four-compartment apartment unit. Choose it only if the need is for an individual household’s outdoor mailbox rather than shared multi-unit mail delivery.
Buying Guide: How to Choose a 4-Unit Apartment Mailbox
Should you choose surface or recessed mounting?
Match the mailbox to the building’s installation plan. A surface-mounted unit is intended to attach to a surface; a recessed unit is designed for an opening in a wall. Measure the available area and check the product’s installation details before ordering. The listed 3504ASU is surface mount, while the 3504SRU and 3504ARU are recessed models.
How many doors and compartments are required?
Count the residents or mail recipients who need separate compartments. A four-door model is the closest match for a four-unit setup. The 3503ARU has three doors, so it is better suited to a three-recipient arrangement. A single curbside mailbox does not provide separate apartment compartments.
What compartment and lock details matter?
Compare the internal space with the kinds of mail residents receive and check how each compartment is secured. The 3504SRU listing provides dimensions and describes a 5-pin cylinder cam lock with two keys. The supplied details for the other Salsbury models do not provide the same level of specification, so confirm their dimensions and lock information before purchase.
What should you verify before ordering?
- Confirm that the mailbox has the required number of doors.
- Check whether the product is surface-mounted or recessed.
- Measure the installation area and compare it with available product dimensions.
- Verify lock, key, and mounting details when they are important to the project.
- Check any applicable building or postal requirements for the property.
Frequently Asked Questions
What is the best listed option for a four-unit building?
The Salsbury 3504ASU is a four-door surface-mounted option. For recessed installation, compare the 3504SRU and 3504ARU.
Which listed four-door model gives compartment dimensions?
The Salsbury 3504SRU lists each compartment as 5-1/2 inches wide, 16-1/4 inches high, and 6-3/4 inches deep.
Is the Salsbury 3503ARU suitable for four apartments?
It has three doors, so it does not provide four separate compartments. It is better suited to a three-recipient setup.
Is the adoorn mailbox a four-unit apartment mailbox?
No. It is a single post-mount mailbox for an individual household, according to the supplied product details.
What should buyers check for a recessed mailbox?
Measure the wall opening and verify the mailbox’s dimensions, compartment configuration, and installation requirements before buying.