USPS-Approved Cluster Mailboxes

Yes. All cluster mailboxes we sell are USPS-approved and meet current STD-4C or STD-4B+ specifications. Top brands like Florence and Salsbury manufacture these units to exact postal standards, including tenant doors, parcel lockers, and outgoing mail slots—all ready for immediate installation and mail delivery.

 Yes. We offer volume-based discounts for multi-unit orders—ideal for apartment complexes, HOAs, and commercial developers. Many products show discounted pricing in-cart, and you can also request a quote for custom pricing on bulk orders of five or more units.

Most standard cluster mailbox models ship within 3–5 business days. Custom colors or large-quantity orders may take 7–15 business days. All CBUs ship via freight, and liftgate service is available for convenient curbside delivery. You’ll see estimated shipping and delivery timelines after entering your address during checkout.

Match your CBU size to the number of mail recipients—standard options include 4-, 8-, 12-, and 16-door units. If you serve more tenants than one unit allows, you can install multiple CBUs side by side. It's smart to plan for future occupancy when estimating your needs.

Cluster mailboxes can be installed by property managers, contractors, or maintenance staff. Each unit includes a USPS-compliant pedestal and mounting hardware. You'll need a flat, secure concrete pad and USPS approval of the mailbox location before mail delivery can begin. Our installation guide walks you through the full process.