Mail Boss Base Plate
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What is the CBU Price Match Guarantee?
It's pretty simple. If you find this model* cluster mailbox on another online retail site for a lower price, including any shipping and taxes, then we will match that competitor's price.
Before we can match a competitor's price, please note:
- We will need the exact URL of the product page in question. A screenshot of the competitor website will not suffice.
- Some competitors hide their freight charges until you enter the checkout, so please keep this in mind.
- If you are ordering multiple units, check our Volume Discount Pricing table (to the right of our sale price) to see if we're the better price for the quantity you need.
* By "model", we mean a CBU that has the same number of tenant doors and the same manufacturer specifications.
Mailbox Base Plate (Steel) - Secure Mount by Mail Boss
What Is a Mailbox Base Plate?
A mailbox base plate is a steel mounting plate that anchors your mailbox post directly to a hard, non-soil surface. Standard post installations rely on setting the post in the ground. That works fine for soft earth.
But when your surface is concrete, asphalt, or another rigid material, you need a different solution. The base plate bolts flush to the surface and holds the post firmly in place, giving you a secure, stable mount without any digging.
When Do You Need a Mailbox Base Plate?
You'll need a base plate when standard in-ground installation isn't an option. Common scenarios include:
- Concrete driveways or aprons: No digging is possible, so surface mounting is the only path forward.
- Asphalt surfaces: Ground penetration isn't practical; the base plate provides a stable alternative.
- Brick, stone, or masonry pillars: Existing hard structures need a flush-mount solution.
- Metal or non-wood posts: Some post types don't support traditional in-ground methods.
- Replacing or upgrading an existing installation: If you're swapping out an old post in a previously paved area, the base plate lets you reuse the footprint cleanly.
Why Choose our Mailbox Base Plate & What Are its Benefits?
This base plate is built from 12-gauge welded steel. That gauge is thick enough to resist bending, flexing, and surface fatigue over years of outdoor exposure. It's not a lightweight stamped part. It's a structural component rated for long-term use in harsh conditions.
The steel receives a powder-coated finish, which locks out moisture and prevents rust from taking hold. You can choose from four finish colors: black, granite, white, or bronze. Each color coordinates directly with Mail Boss post and mailbox finishes, so your installation looks intentional rather than patched together.
We include all the hardware and a printed instruction sheet with every base plate. Anchor hardware bolts the plate directly to concrete or asphalt, locking the post firmly at the surface and eliminating any movement at the base. The 8.5" x 8.5" footprint distributes load evenly across the mount, which reduces stress on individual anchor points and keeps the post plumb over time.
Features of this product:
- Made of 12-gauge welded steel for strength & durability
- Includes necessary hardware & clear instructions
- Durable powder-coated finish
- Available in black, granite, white or bronze
- Dimensions: 8.5" x 8.5"
Frequently Asked Questions
Do I need a mailbox base plate with every mailbox?
No. You only need a base plate when in-ground post installation isn't possible. If you're setting a post in soil, you don't need one. The base plate is specifically designed for hard surfaces like concrete and asphalt, or for situations where an existing surface prevents traditional ground-set installation.
What are the shipping and pickup options for this mailbox base plate?
This base plate ships fast, typically within 1-3 business days. It ships via USPS, UPS, or FedEx Standard Ground to all 48 contiguous United States. If you're located in Alaska or Hawaii, contact the Budget Mailboxes team directly at 1-866-707-0008 for a shipping quote. In-store pickup isn't available, but free shipping applies to qualifying orders over $99.
Can a mailbox base plate be used with an existing post or surface?
Yes. The base plate is designed specifically for use with the Mail Boss 27" Surface Mount Post, but it can accommodate other applications depending on your setup. It mounts flush to concrete or asphalt using anchor hardware, making it compatible with existing hard surfaces. If you're replacing an old installation or upgrading an existing post location, it fits cleanly into that workflow.
Are dimensions and weight the same for all mailbox base plates?
No, specs vary by model. For this specific Mail Boss Base Plate (SKU: MB-Base-Plate), here are the confirmed product specs:
- Dimensions: 8.5" x 8.5"
- Weight: 10 lbs
- Material: 12-gauge welded and galvanized steel
- Finish: Powder-coated, available in black, granite, white, or bronze
- Compatible Manufacturer Numbers: 7158, 7156, 7151, 7155-B, 7157
For Your Reference
OUR SKU is Mail Boss MB-Base-Plate
This item is also sometimes listed under the following manufacturer numbers:
- 7158
- 7156
- 7151
- 7155-B
- 7157
| Shipping Estimate |
Learn more about our Estimated Lead Times
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| Stock Status | In Stock |
| Ships To | Ships to the 48 contiguous United States. For AK or HI delivery, please contact us for a shipping quote. |
| Ship Method | Ships via USPS, UPS, or FedEx Standard Ground. |
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