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SKU: WL-SI-Base-Ext-18BM  |  View All Post Only (Box Sold Separately)

Easy Install Concrete Base Extended 18" Version (pickup only)

(View all from Streetscape Mailboxes)
& Free Shipping!
List Price:
You Save:

$58.06 (20%)

Volume Discount Pricing
2 - 5$216.00
6+ $204.33
According to manufacturer:
Usually ships in 1 to 3 weeks
Note: Products ship directly from the manufacturer, Streetscape Mailboxes

Easy Install Concrete Base Extended 18" Version (pickup only)

Streetscape Products combine decorative and fully-functional features to give your home many years of service. All Streetscape products are hand-crafted in the USA and offer a variety of personalization options.

See Base Model: SI-014 for a model that can be mailed


  • Dimensions: 3"H X 12"W with 4 anchor bolts
  • Model Number: SI-Base-Ext-18


METHOD 1 - Using prefabricated installation base (not included with post purchase)

  • STEP #1
    Mark pole center location 20" behind curb face. Mailbox door will be 9 1/2 to 11" behind curb face.
    (Confirm distance with postal carrier)
  • STEP #2
    Dig hole using installation base as imprint on ground (see drawing).
  • STEP #3
    Insert installation base in hole. Confirm base is level and 1" above surface. Remove installation base.
  • STEP #4
    Mix concrete and fill hole to 1 1/2" from top. (Caution: quick setting concrete may set too fast).
  • STEP #5
    Insert installation base in hole. Level base and adjust anchor bolts to parallel with curb. Allow concrete to set.
  • STEP #6
    Mount mailbox pole to base. Use back access door for large base. (Mailbox on left).
  • STEP #7
    Mount custom address sign and base cover (if applicable), then mount mailbox.

METHOD 2 - Use poured concrete (quikcrete), set the anchor bolt according to provided pattern and let dry. After concrete is dry (a few hours), simply attach the mailbox post to bolts.

For Your Reference:

OUR SKU is SI-Base-Ext-18

This item is also sometimes listed under the following manufacturer numbers:

NOTE: This is a special-order item. As such, orders for this item cannot be cancelled once placed. To ensure your satisfaction, please call us with any questions you have prior to ordering.

Dimensions & Weight
Ship Weight:
Easy Install Concrete Base Extended 18" Version (pickup only)
18 in. W x 3 in. H
150.00 lbs
General Category:
Residential Mailbox
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Easy Install Concrete Base Extended 18" Version (pickup only)
Shipping Information:

Shipping Estimate:

Usually ships in 1 to 3 weeks

Stock Status:

In Stock

Ships to:


Ship Method:

FedEx/UPS (Learn More)

Wall Mount Mailboxes Locking Mailboxes Commercial Residential