In addition to these types of units, the DVault brand curbside locking mailboxes are also Approved for curbside mail delivery. The following mailboxes are considered USPS approved for Renovation or Replacement Use: The following mailboxes are considered USPS approved for New Construction: Postal Carrier to install their arrow lock for the master door (this allows the postal carrier to deliver mail to all individual units within the mailbox cluster).

An approved Cluster or 4C Horizontal unit will be prepped for the U.S. What is a USPS Approved Mailbox?Ī USPS Approved mailbox refers to any commercial or residential mailbox that is pre-approved by the Post Office prior to proper installation.

For any mailbox project that will require USPS mail delivery, we recommend you consult your local Postmaster prior to ordering.Īll new construction and renovation designs require USPS STD-4C compliant mailbox systems, such as standard CBUs and 4C Horizontal units. Please consult your local postmaster for approval.Įxample: The 4B compliant 1400 Series 4B Horizontal mailboxes and Vertical mailboxes are only USPS Approved for replacement applications. Please Note: Not all mailboxes are USPS Approved for all applications.

Usps dropbox dimensions