Cluster Mailboxes USPS Approved CBU Commercial

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16 Door Florence CBU Cluster Mailboxes$1,499.004 Colors Availablefree shipping & pedestal
12 Door Cluster Mailbox Units by Auth Florence$1,419.004 Colors Availablefree shipping & pedestal
8 Door Cluster Mailbox Unit by Florence Mfg$1,359.004 Colors Availablefree shipping & pedestal
13 Door Cluster Mailboxes by Auth Florence$1,469.004 Colors Availablefree shipping & pedestal
Florence CBU 4 Door Cluster Mailbox Units$1,362.004 Colors Availablefree shipping & pedestal
16 Door CBU Mailboxes with Florence Vogue Accessories Kit$1,847.004 Colors Availablefree shipping & pedestal
16 Door Vogue Classic Cluster Mailbox Accessories$1,847.004 Colors Availablefree shipping & pedestal
12 Door CBU Mailbox Accessories: Florence Vogue Kit$1,787.004 Colors Availablefree shipping & pedestal
Outdoor Parcel Lockers 2 Doors by Florence Manufacturing$1,319.004 Colors Availablefree shipping & pedestal
13 Door Cluster Mailboxes Classic Accessories by Vogue$1,817.004 Colors Availablefree shipping & pedestal
12 Door CBU Classic Mailboxes Accessories by Vogue$1,787.004 Colors Availablefree shipping & pedestal
8 Door Cluster Mailbox Accessories: Florence Vogue Kit$1,756.004 Colors Availablefree shipping & pedestal
8 Door CBU Mailboxes Classic Accessories by Vogue$1,756.004 Colors Availablefree shipping & pedestal
4 Door Parcel Locker with 8 Door CBU Cluster Mailbox$1,575.004 Colors Availablefree shipping & pedestal
Outdoor Parcel Lockers 4 Doors Pedestal Mounted$1,789.004 Colors Availablefree shipping & pedestal
4 Door Cluster Mailbox Accessories: Florence Vogue Kit$1,766.004 Colors Availablefree shipping & pedestal
13 Door CBU Mailboxes with Florence Vogue Accessories$1,817.004 Colors Availablefree shipping & pedestal
8 Door CBU Mailboxes 4 Parcel Lockers with Vogue Kit$1,938.004 Colors Availablefree shipping & pedestal
8 Door Classic CBU Mailboxes 4 Parcel Lockers$1,938.004 Colors Availablefree shipping & pedestal
4 Door Cluster Mailbox Accessories: Classic Vogue Kit$1,766.004 Colors Availablefree shipping & pedestal
Vogue Classic Accessories 2 Doors Parcel Lockers$1,821.004 Colors Availablefree shipping & pedestal
Vogue Classic Accessories 4 Doors Parcel Lockers$2,379.004 Colors Availablefree shipping & pedestal
Vogue Traditional Accessories 2 Door Parcel Lockers$1,821.004 Colors Availablefree shipping & pedestal
Vogue Traditional Accessories 4 Door Parcel Lockers$2,379.004 Colors Availablefree shipping & pedestal

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CBU Mailboxes FeaturesCBU Mailbox Options | CBU Mailbox Applications | CBU Mailbox Installation | CBU Mailbox OrderingFrequently Asked Questions

CBU Mailbox Installed Florence CBU mailboxes are the most durable, highest quality USPS approved outdoor CBUs on the market and continually meet or exceed USPS standards. In fact, the Florence F-series cluster box units have been officially licensed by USPS as the “design standard” that all other commercial mailbox manufacturers must follow.

CBU Mailbox Features


In an effort to protect your mail as well as combat identity theft, Florence Manufacturing designed all multi tenant mailbox systems with the following high-security standards:

  • Tamper-proof – anti-pry construction with no removable parts on the outside of the CBU mailbox
  • Weatherproof – front drip edge and sloping roofline to protect against rain and inclement weather
  • Robotically welded – for added precision and strength
  • Industrial grade aluminum construction – made from tough aircraft grade aluminum
  • Heavy-duty cam locks – that are tamper proof and latch through the mailbox frame
  • Tough anti-fish comb – helps prevent mail fishing
  • Sloping hood on outgoing mail slot – helps to prevent mail theft

Five Year Product Warranty

Florence Manufacturing offers a 5-year Product Warranty (from the purchase date) on all Florence CBUs. The warranty covers any defects in workmanship or materials. For more details see our CBU Product Warranty PDF file.

CBU Mailboxes are USPS Approved

As of 2005, USPS approved Florence CBUs have become the industry standard for outdoor centralized mail delivery. Although CBUs offer improved security, we recommend that prior to installation, you should first check with your local postmaster to confirm the location of proposed CBU mailbox placement.

Once installed, the USPS will also need to be contacted to have them install the master lock for the CBU mailbox main access door. Only the USPS can install master locks and only they will have access to the master lock keys. Florence Manufacturing is the only authorized mailbox supplier to the United States Postal Service.

Florence CBU Mailbox Tenant Lock FeatureHeavy Duty Cam Locks

Each tenant mailbox on the Florence CBU mailbox unit includes a heavy-duty, 5-pin stainless steel cam lock plus 3 tenant mailbox keys. The cam lock also includes a rain shield to protect it from rain and other inclement weather. Extra tenant mailbox keys and replacement locks can be ordered online on our replacement parts page.

Mailboxes Large Enough for Magazines & Small Packages

The wider compartment size on each tenant mailbox is now a USPS standard. Compartments were designed to be wide enough to allow larger envelopes, magazines and small packages to lie flat without having to be folded.

Parcel Lockers Included

USPS regulations now require all mailbox clusters with 10 or more tenant doors to include at least one parcel locker. See our CBU FAQs for more detailed information on how these parcel lockers work.

Other Florence CBU Mailbox Features

Finished in a durable powder coat, all Florence CBUs are designed with reinforced steel. They also include overlapping interlocking seams and aircraft grade aluminum construction to ensure your mail remains secure and adequately protected from would-be mail thieves. For private mail distribution or any application that does not use US Postal Service, our CBUs can be ordered with a private master lock and outgoing mail slot.

Other unique CBU mailbox features include:

  • Sloped mailbox top for water drainage
  • Tight seam clearances to prevent prying
  • Adhesive (or engraved) door numbering
  • Outgoing mail slot with weather protection hood
  • Parcel lockers with key trapping lock
  • Outgoing mail collection compartment (prepped for USPS Arrow Lock)
  • Heavy duty tenant cam locks with three keys per mailbox
  • Matching aluminum mailbox pedestal (included)
  • Aluminum comb to prevent mail fishing in the outgoing mail collection compartment
  • Heavy duty cam latched through the frame for added security

Ask us about USPS approved, vandal proof, secure CBUs with reinforced pedestal fasteners. These are ideal for use as government or military centralized mail distribution systems.

View MailboxWorks Video On CBU Mailbox Features

CBU Options

Florence CBU Mailbox Door ID OptionsTenant Door ID Options

Ask us about tenant door decals or custom engraving. Standard tenant doors come with adhesive decals with black lettering. For custom engraved decals, check the product options or give us a call.

Color Options

Although sandstone is the most popular color, Florence CBUs can be ordered from The Mailboxworks in 4 different color options. These include dark bronze, black, postal grey, and sandstone. These also feature a tough powder coat finish.

Florence CBU Mailbox Finish Options

CBU Mailbox Applications

Who Buys Cluster Mailboxes?

These multi unit mailboxes can be installed wherever outdoor centralized mail delivery is required, including:

  • Apartments
  • College and Universities
  • Homeowners Association (HOA mailboxes)
  • Small businesses
  • Government and Military facilities
  • Commercial properties

Converting for Private Mail Delivery

Florence CBUs may also be utilized for “Private Mail Delivery Service.” If you need to convert an existing CBU, private use requires a Florence Mailbox Conversion Kit to convert from Postal to Private Service. The Florence mailbox conversion kit will allow your company to access the CBU mailbox master door for private mail distribution.

If purchasing for Private Use, please choose the Private Use option on the product page (if available) or give us a call.

4C and Bommer Pedestal NDCBUs

We also carry 4C pedestal mailboxes, which are very similar to the Florence CBU mailboxes, with one exception: they are not USPS approved prior to purchase and installation. For this reason, we strongly advise customers to acquire USPS Approval before purchasing a 4C pedestal mailbox.

Discontinued Bommer mailboxes are outdoor pedestal mailboxes. At one time, they were available in the following configurations:

  • 8 Door Type 1 NDCBU mailbox
  • 12 Door Type 2 NDCBU mailbox
  • 16 Door Type 3 NDCBU mailbox

As these products are no longer USPS approved for new buildings, we no longer sell Bommer NDCBUs. That being said, it may be possible for you to convert your existing Bommer NDCBUs for custom uses such as private mail distribution.

CBU Mailbox Installation

Pedestal Designed for Easy Installation

CBU mailboxes are designed for installation on a pedestal, which is packaged separately. The aluminum CBU pedestal comes fully assembled and includes mounting hardware.

Installation Guidelines

CBU cluster box mailboxes can be installed on new concrete or an existing concrete base. See our installation guide. Once the pedestal mailboxes are installed, it will be necessary to contact the USPS, as only the USPS carrier can install the main access door master arrow lock as well as the capture locks on the parcel lockers.

How to Order

Choosing the right Cluster Mailbox

Florence CBU Mailbox Decorative OptionsWe can help you choose the right CBU mailbox and accessories for your needs. Open a chat with us or call our mailbox experts toll free today. The most popular standard CBU mailbox units we carry are all USPS approved and include:

  • 8 Tenant Doors
  • 12 Tenant Doors
  • 13 Tenant Doors
  • 16 Tenant Doors

You can also order these with various accessory kits, all available in 4 different finishes, including:

  1. Vogue Traditional Accessory Kit
  2. Vogue Classic Accessory Kit
  3. Decorative Stucco Column

The Vogue Traditional and Vogue Classic mailbox accessory kits come with roof caps and ball finials, plus decorative post columns post base, and your choice of 4 door-numbering options. These CBU mailbox hardware accessories are made from 100% die-cast aluminum, come in all standard finishes, and do not require modifications for installation.

Quantity Discount Pricing

All CBU mailboxes are already discounted from the manufacturer’s recommended list price. However, we also offer quantity discount pricing on CBU orders between 2 – 5 units (plus even better pricing on 6 or more).

Need a quote? Submit one here.

CBU Mailbox Replacement Parts

We offer a selection of CBU replacement parts. These include tenant mailbox door replacement locks, key blanks, replacement cams, mailbox number decals, outgoing mail decal, mounting hardware, and replacement doors.

Shipping Lead Time

Free shipping is included on most purchases (unless stated otherwise or unless the cart calculates shipping with your selected items). To expedite delivery times, all CBU orders are shipped directly from the manufacturer using common carrier delivery. Standard cluster mailbox orders will generally ship in 3-5 business days with a delivery time of 5-7 business days, depending on where you are located. Custom orders will generally ship within 1 to 2 weeks with an estimated delivery time of 5-7 business days.

Quantity Discounts on CBU Commercial Mailboxes

We offer bulk discounts when you order two or more of these units at one time. Please fill out our quote request form or contact our mailbox experts directly.

Call The MailboxWorks Toll Free or open a chat today.

Frequently Asked Questions

Mounting CBU Mailboxes

Can I mount the CBU on an existing pedestal?

We do NOT recommend this. Old or used pedestals may not be as strong or may have corrosion issues, which could cause the CBU to collapse. The height of the existing pedestal may also be incorrect, in which case the USPS may decline to deliver mail to the unit. The CBU itself can weigh up to 150 lbs and needs to be properly supported. Using an old pedestal can cause potential danger to your USPS mail carrier and tenants.

Can I mount the CBU mailbox on a pedestal other than the factory supplied pedestal?

We do NOT recommend this. The pedestals that come with CBUs are specifically designed to support the cluster box unit. Should you decide to use a different mounting method or pedestal (other than the factory supplied CBU pedestal and instructions), you will need to obtain approval from your local USPS Postmaster.

Can I adjust the height of the CBU mailbox during installation?

No. CBUs must be installed at the exact height requirements as specified by the USPS.

Can CBUs be mounted on a wall instead of a pedestal?

No. They are only manufactured to be mounted on a pedestal and cannot be mounted to a wall. The CBU needs some sort of structure below to support it.


CBU Mailbox Installation

Do I need to contact my local USPS before installing a cluster box unit?

Yes. Contact your local postal officials before installing, as the USPS may need to determine its placement.

Does my CBU mailbox come with everything needed for installation and usage?

Based on USPS requirements/requests, there are two additional items required for your CBU gang mailboxes that are not included with your purchase (one is supplied by the USPS):

  1. USPS Arrow Locks – supplied by the USPS directly. These are installed on the outgoing mailbox door and parcel locker doors. The USPS does not allow factories or any non-USPS employees to possess these master locks. Once you have your cluster box unit installed, you will need to contact your local USPS to request that they come and install the USPS Arrow Locks. Typically, they do not charge for this service.
  2. Anchor Bolts – used for mounting the CBU mailbox to concrete, which requires 4 bolts per unit. USPS requests that mailbox distributors do not include concrete mounting anchor bolts because there is too much variation in each individual installation. Please refer to our CBU Installation Instructions to determine the anchor bolts required for your mailbox installation. The factory recommends that you use ½-inch diameter L-Bolts and a range of expansion anchor bolts outlined in the instructions. For most applications, you can purchase the L-bolt anchor bolt kit or any expansion anchor bolts from us as well.

Help! I can’t find the tenant keys (or mounting hardware, or installation instructions) for my new CBU.

You should find all the keys, mounting hardware, and instructions tucked carefully inside the mailbox cabinet. In order to access these, you need to:

  1. Take the cluster mailbox module out of the box and set it on a workbench.
  2. Open outgoing mailbox door (located below the outgoing mail slot on the right-hand side).
  3. Carefully push up on the latch on the left side of the inside of the outgoing mailbox compartment (your CBU mailbox will be top heavy).

The right side of the CBU cabinet will open and there will be a latch on the left side of the cabinet to open completely. You will find all the keys, hardware, and instructions in the lower left-hand compartment.

Why did my CBU mailbox not come with anchor bolts?

The USPS requests that we do not provide anchor bolts as each individual installation varies. We sell the basic L-bolts and expansion bolts. Even so, you will need to refer to CBU Installation Instructions by the USPS to determine what expansion bolts you will need to purchase.

Why is there no lock on the CBU outgoing mailbox?

By regulation, USPS must install these master locks, which are called “Arrow Locks.”

Florence CBU Mailbox Parcel LockersCBU Parcel Lockers

What is a parcel locker?

The parcel locker is a component of the CBU that allows for the delivery of larger parcels for your tenants.

How to open a parcel locker.

  1. The USPS mail carrier places the package inside a parcel locker.
  2. The USPS mail carrier then places a corresponding key and instructions in the tenant’s regular mailbox.
  3. The tenant receives the parcel locker key and instructions from their own mailbox.
  4. Once the tenant inserts the key into the parcel locker to retrieve the package, the key remains in the lock and only the postal carrier can then remove the key.
  5. The tenant closes the door and leaves the key in parcel locker door lock.

What is a captive lock?

Parcel lockers have a “captive lock,” which means that once the key is inserted into the lock it cannot be removed. The USPS mail carrier will remove the parcel locker key on their next delivery.

Can I use a parcel locker as a tenant mailbox?

No. USPS regulations state that parcel lockers cannot be removed, converted into tenant mailboxes, modified, or used for any other purpose other than the original parcel delivery purpose.

Replacement Tenant Lock Florence 4C MailboxesCBU Locks And Keys

Do mailbox locks come installed in the CBU mailboxes upon delivery?

Yes. All cluster mailbox locks come with locks installed and with 3 keys for each tenant mailbox lock.

Can I get more than just 3 keys for a tenant door?

You can order up to 6 keys per tenant door if you need more than the standard 3 keys that come with the CBU mailbox unit. Please contact our customer service team by phone or by email to discuss this option.

How do I order additional tenant keys after purchasing a CBU?

Contact us to purchase key blanks that you can take to any locksmith or hardware store to have cut. Please note that the locks and key blanks on all CBU mailboxes are proprietary and are difficult to source through hardware stores and locksmiths. We’d be happy to source these for you!

When ordering, please have the original key(s) available as there are two key blank types used by the manufacturer. You will find a four-digit number on the key followed by “PS”. Examples include:

  • 1000PS – 1999PS
  • 2000PS – 2999PS
  • 3000PS – 3999PS
  • 4000PS – 4999PS

Typically, Florence Mailboxes will use the same key blank for the CBU, but it is not always possible, especially for larger orders. Please check each key before ordering any key blanks.

Can I order new locks for tenant mailbox doors?

Yes. There are several reasons you may want to do this:

  • A tenant moves out
  • Keys for a lock are lost
  • Keys for a lock are stolen

If you need to order new locks for your CBUs, please contact us.

The outgoing mailbox door on my CBU mailbox doesn’t have a lock. What should I do?

This USPS Arrow Lock can only be installed by USPS upon your request. Please contact USPS for installation. Typically, they do not charge for this service.

CBU Cluster Mailbox Shipping And Delivery

How are CBUs shipped?

All CBUs (regardless of model number or number of doors) ship directly from the manufacturer in two boxes:

  • One box contains the pedestal, which is approximately 25 lbs.
  • The other box contains the CBU mailbox model, which ranges from 100 – 150 lbs depending on the unit size.

Any decorative components such as a roof, cap, or pedestal cover will ship in additional boxes. We recommend that upon delivery you confirm you have received the right number of shipping boxes. Ensure that the number of boxes agrees with the box count on your delivery receipt provided by the freight company.

What if one of my CBU parcels or boxes appears to be damaged upon delivery?

Carefully inspect and report any damaged shipping boxes to the delivery person before signing for the delivery of goods. If you notice significant damage, you can refuse delivery of the item. Note: we recommend only refusing delivery of the one damaged item and not the entire shipment. Should this occur, please contact us as soon as possible.

What if I notice damage of shipping boxes after the delivery person has left?

In the case that you only notice damage after you sign for the delivery, please contact us as soon as possible. We recommend taking pictures to document the damage for the factory and delivery company’s records. Please note that we can best address the issue if you alert us right away.

CBU Usage

Can F-series CBUs be reconfigured?

No, you cannot change the configuration on any F-series cluster box mailbox. In fact, USPS owns the patents on these units and prohibits any modifications. Prohibited modifications include resizing, moving, adding, or eliminating any of the mailboxes, parcel lockers, or outgoing mail components.

Can I use a CBU mailbox for private mail delivery?

Yes, you can use your CBU for mail and parcels delivered by someone other than USPS. In order to use them for private mail delivery, you will need to purchase a private master conversion lock (CK25750) for both the master door and parcel locker.

Can I install a digital combination lock on the CBU?

No. Combination locks cannot be installed for private mail distribution in settings like a College, University, or an office. We offer several alternative community mailboxes and multi-mailbox units with combination locks.

CBU Cluster Mailbox Replacement Parts And Accessories

Can I order replacement pins for the cluster mailbox door?

Yes, we sell Type III and Type IV long-hinge rods/pins. Because these are specific to each manufacturer, we will need to verify your model first.

Can I buy a sign holder to attach to the CBU cluster mailbox?

We have been asked if we sell Plexi sign holders to attach to the CBU and house various notices. Unfortunately, we do not sell these.

Can I buy a replacement magnet for the front of the mailbox?

If you are missing the magnet that permits the front of the mailbox to open, please call us.


Can I get a CBU cluster mailbox with more or fewer doors than the standard 8, 12, 13, or 16 door units?

Yes. You would be looking at our 4C Pedestal mailboxes that can range from 1 to 29 tenant doors, with a variety of configurations. Note: these require USPS approval prior to purchase.

Are there rear loading cluster mailbox units that open from the back?

No. The rear-loading CBUs are not available.

Can I buy a used CBU cluster mailbox at The MailboxWorks?

No. For security reasons all CBUs at The MailboxWorks are new.

Can I buy a high-security CBU mailbox?

High-security CBU mailboxes have been discontinued because most of these security features have been incorporated into the current standard CBU mailboxes on the market.

Call us Toll-Free for more information.

Note: the product description content on this page has been paraphrased and reposted with the permission of Budget Mailboxes.