Replacing a Broken Into Neighborhood Cluster Mailbox Unit (CBU)

Bellingham Mailbox •

For this project, a neighborhood cluster box unit (CBU) serving 13 homes had been forced open during a break-in and needed complete replacement. Because the mailbox had been compromised, USPS suspended mail delivery to the unit and began holding residents’ mail and packages at the local post office.

That meant homeowners now had to make trips to the post office to retrieve:

  • Mail
  • Checks
  • Packages
  • Important documents

Restoring mail delivery quickly became the top priority for the neighborhood.

How Cluster Mailbox Security Has Improved Over Time

One thing many homeowners don’t realize is that USPS tightly controls the design specifications for cluster box units.

There are currently two approved manufacturers producing USPS-compliant CBUs:

  • Salsbury Industries
  • Florence Corporation

If you place the two side-by-side, the overall mailbox design is nearly identical. The only visible difference is the manufacturer placard on the unit itself.

Over the years, USPS has continued refining their design specifications with a much heavier emphasis on security and durability.

Older cluster mailbox models often:

  • Used more plastic components
  • Had weaker structural reinforcement
  • Lacked secure package delivery
  • Were more vulnerable to prying and forced entry

Modern CBUs are substantially more robust.

Newer USPS-approved cluster mailbox systems now commonly include:

  • Reinforced steel pry points
  • Heavier-duty construction
  • Anti-phishing mechanisms that help prevent theft of outgoing mail
  • Integrated package lockers for secure parcel delivery

Cluster mailbox units are designed to last a long time. It’s still common to see 20–30-year-old CBUs actively in service today. But upgrading to current USPS specifications provides a significant improvement in both durability and security.

Replacing a Shared Mailbox in a Non-HOA Neighborhood

One thing that made this project somewhat unique was that the neighborhood was not governed by an HOA.

Replacing a shared neighborhood mailbox in a non-HOA community can sometimes be one of the more difficult parts of a project like this, not because of the installation itself, but because of coordinating payment between neighbors.

That challenge becomes even more complicated when:

  • Rental properties are involved
  • Homeowners are absentee owners
  • Residents disagree on replacement options
  • Nobody wants to manage the project

For this installation, one homeowner stepped up and coordinated communication with the neighborhood while collecting contributions from all 13 homes.

The process actually went very smoothly.

One thing we’ve seen some neighborhoods do in non-HOA situations is temporarily withhold mailbox keys until reimbursement has been collected from all participating homeowners. Every neighborhood handles coordination differently, but having one organized point of contact usually makes a huge difference.

Removing the Existing Cluster Mailbox

Once the replacement unit arrived, we removed the damaged CBU and prepared the site for the new installation.

The replacement mailbox was a new 13-door Cluster Box Unit designed to restore:

  • Secure mail delivery
  • Locked outgoing mail
  • Secure package delivery
  • Reliable USPS access

After installation was completed, all mailbox keys were delivered to the homeowner coordinating the project so they could distribute keys to the neighborhood residents.

Coordinating With USPS to Restore Mail Delivery

One important part of any CBU replacement is coordinating directly with USPS before the mailbox can officially return to service.

Once the installation was complete, we worked with the local postmaster to have the new mailbox equipped with the USPS carrier lock specific to the mail route.

That allows the mail carrier to:

  • Open the mailbox
  • Deliver incoming mail
  • Retrieve outgoing mail

Until that process is completed, USPS cannot resume normal neighborhood delivery.

The Finished Result

What started as:

  • A broken into neighborhood mailbox
  • Interrupted mail service
  • Residents traveling to the post office daily
  • An outdated CBU

became:

  • A new secure 13-door cluster mailbox unit
  • Restored mail and package delivery
  • Reinforced mailbox security
  • Secure outgoing mail
  • A cleaner and more durable long-term solution for the neighborhood

Customer Review

After the installation, the homeowner coordinating the project left the following Google review:

“Our neighborhood cluster mailbox was broken into. I called Bryce and within a day he had inspected our box and sent an estimate for a replacement. Once I collected money from everyone I gave Bryce a deposit, and our new box was installed eleven days later! Bryce was great to communicate with and very responsive over text and email. He showed up on time, removed the broken box, and installed the new one. He even called the postmaster to let them know we had a new box. The process couldn’t have been easier. Thanks so much!”