Easy Guide to 4C Mailbox Installation Steps

February 22, 2019

Florence 4C Mailboxes InstalledFor the uninitiated, the installation of 4C horizontal mailboxes can appear to be a daunting process but it doesn’t have to be.

Buying and installing USPS STDs 4C compliant mailbox systems is really quite straightforward if one simply takes the time to carefully consider these three pre-planning steps prior to the commercial cluster mailbox installation:

  1. Ask the mailbox experts if you need help
  2. Decide how you want your 4C cluster mailboxes mounted
  3. Review USPS 4C mailbox regulations first

1. Ask the Commercial Mailbox Experts

First, avoid ordering the wrong cluster mailbox units for your project by contacting a 4C commercial mailboxes expert at a reputable reseller, such as The MailboxWorks.

Unlike Internet-only stores that simply drop-ship mailboxes they have never seen, our commercial mailbox experts here at The MailboxWorks know every aspect of the products we sell and can guide you with not only the most versatile 4C mailbox suites for your project but also help you with mailbox configuration and installation options.

We also offer professional commercial mailbox installation. With just a few details about your project, we can provide a complimentary quote for the most economical and efficient way to complete your project. For more information, call us at 1-866-717-4943.

2. How Will Your 4C Mailboxes Be Mounted?

Second, consider the actual installation of 4C mailboxes; will they be rear access or front access, and should they be recessed or surface mounted?

UPDATE: 4C Pedestal Mailboxes have been discontinued as of November 30, 2020. The USPS Cluster Box Unit (CBU) Mailbox is now the standard for all multi-family mail delivery.

Rear Access Mailboxes – Some project managers install 4C mailboxes with rear access that are designed for the postal carriers to access the unit from the rear either through a master door or (if rear access is in a private locked room) with an open back. Military and government complexes, as well as university and college campuses that require private mail distribution, will also install 4C mailboxes that have rear access through a secure room.

Front Access Mailboxes – Others prefer the installation of 4C mailboxes have front access, which includes a master door (with USPS postal lock) that opens the entire unit to allow postal carriers access to all mailbox compartments at once. According to the STD-4C (USPS Standard 4C) regulations, all major renovation projects and new construction projects must install USPS-approved 4C mailboxes.

In addition, some installation venues simply do not have the wall clearance for commercial mailbox units to be completely recessed into the wall. These are excellent candidates for an easy-to-install special 4C collar, which will ensure the 4C mailbox units have a polished, finished look when surface mounted.

3. Adhere to USPS 4C Mailbox Requirements

The third and most important pre-planning step when installing 4C mailboxes is to review USPS installation guidelines for 4C horizontal mailboxes before starting the project.

The US Post Office has established firm guidelines for the installation of 4C horizontal mailboxes to ensure access for all patrons, regardless of handicap or stature.

Here’s a quick review of the key five USPS 4C requirements you must know:

  1. First, a minimum of one of the 4C horizontal mailbox compartments must be positioned less than four feet from the finished floor.
  2. Second, no interior bottom shelf of any parcel locker compartment can be positioned less than 15 inches from the finished floor.
  3. Third, none of the tenant compartments in the Florence 4C mailbox units can be located higher than 67 inches above the finished floor.
  4. Fourth, no interior bottom shelf of a tenant compartment can be positioned less than 28 inches from the finished floor.
  5. And fifth, the USPS Arrow lock must be located between three and four feet from the finished floor.


Simplify Your Mail System with 4C Mailbox Installation

Installing a 4C mailbox system is a straightforward process that enhances the functionality and security of your mail service. These steps ensure that your new 4C mailboxes are set up correctly, providing a durable and compliant solution for any building or community. From choosing the right location to securing the unit properly, each phase is designed to maximize ease of use and postal efficiency.

Opting for a 4C mailbox system means committing to a secure, ADA-compliant, and aesthetically pleasing mail solution. Whether you’re upgrading an existing setup or implementing a new one, the installation process is key to enjoying the full benefits of these modern mailboxes.

For a seamless transition to a 4C mailbox system, Mailbox Works offers a range of options and accessories to fit your specific needs. Upgrade your mail service with confidence by choosing 4C mailboxes. For assistance with selection and installation, visit our website or contact us at 1-866-717-4943. Explore 4C Mailbox Solutions | Get Expert Installation Help

You can also view the USPS 4C mailbox installation requirements here.

For more information on commercial mailboxes see our web page on How to Buy Mailboxes.


Categorized in: