Frequently Asked Questions
-
- • Cluster Box Units (CBUs) are USPS-approved, centralized mail delivery systems typically used for multi-tenant communities, offices, and residential developments.
- • Each CBU features multiple locking tenant doors, parcel lockers, and an outgoing mail slot.
- • These outdoor mailboxes streamline delivery while keeping mail secure.
-
- • 4C mailboxes are the USPS standard for new construction and major renovations.
- • They feature larger tenant doors, integrated parcel lockers, and enhanced security compared to older 4B horizontal mailboxes.
- • While 4B units can still be used in some replacement situations, they are no longer compliant for new installations.
-
- • USPS-approved mailboxes meet strict postal regulations for durability, accessibility, and security.
- • They are tested to ensure compatibility with USPS delivery standards, which guarantees postal carrier access without requiring special approval.
-
- • CBU installation requires anchoring the pedestal base to a concrete pad for stability and aligning with USPS-approved accessibility guidelines.
- • Detailed installation guides are available to ensure compliance and proper setup.
-
- • Start by considering the number of tenants and parcel needs.
- • Properties may require outdoor CBUs, indoor 4C horizontal mailboxes, or a combination of both. Our blog explains the differences in detail: CBU vs 4C Mailboxes: Which Is Best for Your Property?.
- • For tailored advice, our team can also help verify USPS compliance and ADA requirements.
-
- • Yes! All new installations must use USPS-approved 4C mailboxes or Cluster Box Units. Each product page includes compliance and certification details.
- • Learn more in our article: USPS Regulations and Mailbox Standards.
-
- • 4C mailboxes come in multiple configurations, including standard tenant compartments, oversized parcel lockers, and custom layouts to fit mailroom design and tenant needs.
-
- • Regular cleaning and light maintenance extend the life of your unit. Wipe down doors and locks, lubricate moving parts annually, and inspect the pedestal base after storms or heavy use.
- • See our care and cleaning guide for detailed instructions.
-
• Our warranty covers defects in materials or workmanship for five years on all 4C mailboxes and outdoor CBUs.
-
• Most standard units ship within two weeks, while customized or specialty models typically take 2–4 weeks.
-
- • Yes, each unit comes complete with all hardware except for the anchor bolts needed to secure the pedestal base to a concrete pad.
- • These bolts are readily available at local hardware stores.
-
• No, engraving is included in the price of your mailbox.
• However, please note that engraving may add additional lead time to your order.