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SKU: WL-CBU-16-SDBM  |  View All 16 Door CBU Mailboxes

16 Door CBU Mailbox - Sandstone

(View all from Cluster Box Units)
& Free Shipping!
List Price:
You Save:

$284.22 (20%)

Volume Discount Pricing
2 - 5$1,112.00
6+ $1,090.67
USPS Approved
Select Option

Will the USPS be delivering to this mailbox?

Rush Order

Door ID Layout

Optional Anchor Bolts

Door Identification

According to manufacturer:
Standard - Usually ships in 1 to 3 weeks
Custom - Usually ships in 3 weeks
Ships directly from the factory floor to ensure the quickest available delivery.

16 Door CBU Mailbox - Sandstone

When it comes to price per number of doors, the 16 Door CBU is the best value on the market today. Made of durable aluminum and stainless steel hardware, the 16 Door CBU is the preferred unit for outdoor, centralized mail delivery. Matching pedestals are included and come with bolts for fastening the unit to a concrete slab in a centralized location for either residential developments or commercial locations that require a USPS approved mail center.

The 16 Door Cluster Mailbox is most often used for outdoor, new construction installations, and is one of our most popular products because it provides secure access to mail and package delivery. While we do offer High Security CBU options for locations that require more security, the standard cluster mailbox is constructed of heavy-duty materials, which makes it resistant to theft.

Meets USPS Specifications

The 16 Door Cluster Mailbox is pre-approved by the USPS for centralized mail delivery. Designed for new construction developments, you will need to install it according to USPS specifications. If you have questions about how to install the CBU, refer to our Installation Video or the Installation Instructions for more details.

How to determine if 16 Doors is right for you:

The number of doors depends on the number of units or tenants your mailbox will be required to serve. For example, if you need to serve 48 tenants, then you'll want to go with three 16 Door units. But there's also the consideration of value -- with the 16 Door, you will be purchasing the "lowest price-per-door" commercial mailbox we sell. Also, if you are already approved by your local post office for the Cluster Mailbox, then the 16 Door CBU is the best value option available (and our most popular commercial / apartment mailbox for centralized mail delivery).

Also, if you need a mailbox unit for new construction, the majority of our new construction customers (developers, contractors, etc.) purchase this mailbox.

Application Benefits

Compared to traditional mailboxes, here are some of the benefits of the CBU application:

  • It's centralized: this means that the mailbox saves time and money when the time comes to install the units.
  • USPS Preferred: the post office spends less time bringing mail to a single, outdoor mailbox. Traditional mailboxes demand a longer mail route.
  • For housing and commercial developments, the 16 Door Cluster Mailbox is the best value. Each tenant box stands in place of a traditional mailbox for each house or office. Whereas a traditional mailbox and post package would cost upwards of $200.00, the price per tenant box for the 16 Door CBU is $71.00.

How many units do you need? See our price per door table below for calculating the cost per tenant door.

Price per Door Table


Price per Door

8 Door Standard CBU


12 Door Standard CBU


13 Door Standard CBU


16 Door 4C Wall Mount


16 Door Standard CBU

$71.00 (Best Value)

Other Options

While the pedestal mounted outdoor Cluster Box Unit is the industry standard, there are other types of cluster mailboxes that might be more suitable for your project or location. Do you need a recessed or surface mounted unit? If you need a free-standing pedestal unit for outdoor use, the CBU is right for your application. However, if you need units for indoor use or if you intend to mount your cluster mailboxes within an outdoor kiosk, you will probably need a Front Loading 4C Horizontal Mailbox.

Color Options

If you need to purchase a different color, you can view our selection of variations on the 16 Door CBU category page.

Technical Specifications

The top of the cluster mailbox is 30.5 inches wide by 18.5 inches deep. The cluster box unit measures 30.5 inches wide by 16.75 inches deep by 48.25 inches high. With the pedestal, the unit is 62 inches high. For more specs, please view this Technical Drawing.

Other Specs and Details

The 16-Door CBU includes two (2) integrated parcel lockers and a matching pedestal. Each aluminum door includes a heavy duty five-pin cylinder cam lock with a dust and rain shield, along with three (3) keys. One additional compartment is labeled “Outgoing Mail” and includes a weather protection flap and an 11-3/4 in. W x 3/4 in. H mail slot.

The CBU also features numbered mail compartments and a mail carrier access door for USPS provided master arrow lock. The mailbox is constructed of high-grade, durable aluminum while the hardware (locks, latches, etc.) is constructed of stainless steel. All CBUs on Budget Mailboxes are manufactured here in the USA.

Accommodates Larger Envelopes and Magazines

The Cluster Box Unit is known as a 4C Horizontal Mailbox, which is the current USPS Standard. Under 4C regulations, the tenant boxes are wide enough that larger envelopes and magazines can be delivered flat.

Integrated Parcel Lockers

Parcel lockers are integrated into the CBU. The 16 Door CBU includes two parcel lockers per USPS regulations.

Matching Pedestal

The CBU Pedestal is included with all cluster mailboxes. It is constructed of heavy-duty aluminum. Like the cluster box itself, it resists corrosive elements. The pedestal comes with the needed stainless steel hardware for 1) mounting the pedestal to the box and 2) mounting the unit to a concrete slab, with the exception of the CBU Anchor Bolts (required for installation).

Heavy-Duty Cam Lock

Every tenant door on the Cluster Box Unit features a stainless steel heavy-duty cam-lock. This simple yet effective locking mechanism keeps your mail safe until you retrieve it.

For Your Reference:

OUR SKU is Cluster Box Units CBU-16-SD

Dimensions & Weight
Ship Weight:
16 Door CBU Mailbox - Sandstone
62"H x 30-1/2"W x 17-7/8"D
16 Standard Compartments:
3 1/4"H x 12 7/8"W x 16 3/4"D
1 Outgoing Mail Compartment:
3 1/4"H x 12 7/8&q
175.00 lbs
General Category:
Cluster Mailbox
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Have a question about this product?
Frequently Asked Questions
Question: How do you open the master loading doors?
Answer: This is a common question as the method for opening the door isn't very intuitive. What you need to do is find the door near the center on the right side of the CBU that has an empty lock hole in it. This is where the Post Office will install their arrow lock (master lock). That door should easily swing open. After opening that door, if you reach inside you should feel a horizontal bar that you can press up. When you press up, this should release the master door lock and the master doors should be able to open.

Question: Hi I just wondering if we need to work this out with the postoffice? And do you have any person that could install it for us?
Answer: We do recommend you let the post office know you are getting a cluster box. We do not have installers.

16 Door CBU Mailbox - Sandstone
Shipping Information:

Shipping Estimate:

Standard - Usually ships in 1 to 3 weeks
Custom - Usually ships in 3 weeks

Stock Status:

In Stock

Ships to:


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