
Installing a plastic mailbox is a simple DIY task for any homeowner. You can mount a plastic mailbox in front of your house, to the side of a driveway, or on the walls or fence surrounding your home. The United States Postal Service (USPS) has specific requirements you must follow when installing a mailbox on your property. You should also check your city ordinances to ensure that the location you've selected for your mailbox is accessible and complies with local laws and regulations. If you plan to use concrete to set your mailbox post, prepare a bag of fast-setting concrete mix per the manufacturer's instructions and pour it into the hole around the post. Leave a few inches of space at the top of the hole and immediately check the post level to ensure your mailbox hasn't shifted. Allow the concrete to cure before removing the support beams.
| Characteristics | Values |
|---|---|
| Installation type | Wall-mounted or post-mounted |
| Wall-mounted mailbox height | 41 inches off the ground or porch |
| Post-mounted mailbox height | 41"-45" from the road surface to the bottom of the mailbox |
| Post material | Wood, plastic, or aluminum |
| Post-mounted mailbox location | On the lawn, 6-8 inches from the curb |
| Wall-mounted mailbox location | Near the main entrance |
| Installation tools | Post digger, mailbox post, house letters and numbers, ready-mix cement, work gloves, drill, and shovel |
| Installation steps | Dig a hole, place the post, use supports, pour concrete, and attach mailbox hardware |
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What You'll Learn

Choosing a location for your mailbox
Choosing the location for your mailbox is an important step in the installation process. Firstly, you must decide whether you want a curbside mailbox or one that is wall-mounted by your door. If you opt for a curbside mailbox, the United States Postal Service (USPS) guidelines recommend positioning your mailbox 41" to 45" above the road surface, with the bottom of the mailbox placed 6" to 8" back from the curb. If you do not have a raised curb, consult your local postmaster for advice.
For a wall-mounted mailbox, you should place it near the main entrance so that mail carriers can easily spot it. Ensure that the mailbox is installed at a height where it can be easily accessed by the mail deliverer, and check that it is level using a spirit level. You can choose to install it on a fence or by your front door, depending on what suits your home best.
Before finalising the location, consider the overall aesthetic you wish to achieve. The mailbox's colour and design can complement or contrast with your home's exterior. For instance, a white mailbox outside a white house creates an elegant look, while a blue mailbox adds a stylish touch.
Lastly, check with your local post office to ensure that your chosen location and mailbox design adhere to their standards. This step is crucial, as you want to ensure your mailbox meets the necessary requirements for mail delivery.
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Selecting the right mailbox post
When selecting the right mailbox post, there are several factors to consider, including durability, aesthetic appeal, maintenance needs, and postal regulations. Here are some key points to help you choose the most suitable mailbox post:
First and foremost, consider the material of the mailbox post. Common options include metal, plastic, wood, aluminum, and steel. Metal mailboxes are known for their durability and strength, making them ideal for weathering various environmental conditions. Plastic mailboxes are easy to maintain and resistant to rusting. Wood offers a traditional aesthetic but may require more maintenance to prevent damage. Treated wood, in particular, can be an excellent choice as it is weather-resistant and long-lasting. Aluminum and steel are also favoured for their strength, weather resistance, and low maintenance.
The size and capacity of the mailbox post are another important consideration. Ensure that the mailbox is large enough to accommodate your daily mail volume, including letters, envelopes, postcards, and catalogs. Positioning the mailbox near the main entrance or along the side of the road or driveway is recommended for easy access by both the mail carrier and yourself.
Additionally, it is crucial to follow postal regulations when selecting a mailbox post. The United States Postal Service (USPS) has specific requirements for mailbox placement and construction. For example, the USPS recommends that mailboxes be placed 41 to 45 inches above the road's surface and 6 to 8 inches back from the curb. The mailbox post should be stable yet flexible, able to bend or fall to the side if struck by a vehicle. Avoid using unyielding and potentially dangerous materials such as large-diameter metal pipes or concrete posts. Instead, opt for a 4" x 4" wooden support or a 2" diameter standard steel or aluminum pipe. Bury the post no more than 24 inches deep.
Lastly, consider the overall style and design of the mailbox post. Ideally, the mailbox should complement your home's exterior and match its unique style, whether it be old-fashioned or modern. Choosing a mailbox in a similar colour to your house can also enhance its aesthetic appeal. While it is essential to consider your personal preferences, remember to check if your neighbourhood has any specific guidelines or rules regarding mailbox appearance.
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Preparing the hole for the post
First, you need to choose the right location for your mailbox. Check your city ordinances and USPS guidelines to ensure that your chosen location is accessible and compliant with local laws and regulations regarding mail service. It is important to ensure that your mailbox is easily accessible for your mail carrier. According to USPS requirements, a mailbox should not sit higher than 41 to 45 inches above street level. Place your mailbox approximately 42 inches off the ground, six to eight inches from the curb.
Once you have determined the location, the next step is to dig a deep hole for the post. You can use a post digger to create a freshly dug hole. Ensure that you are digging in a safe area by calling your local digger's hotline to avoid underground utility lines and other hazards.
After digging the hole, it is time to prepare the post for cementing. Place the mailbox post into the hole and use supports to prop it up, ensuring that it does not tip from side to side. Make sure these supports are steady, so the post remains stable when you pour the concrete. You can also use a level to check that your post is straight before pouring the concrete.
Although it is not mandatory to use concrete to set a mailbox post, it is highly recommended. Concrete will increase the stability of your mailbox and help it withstand shifting temperatures, groundwater, and seasonal changes. Prepare a bag of fast-setting concrete mix according to the manufacturer's instructions and pour it into the hole, leaving a few inches of space at the top. Do not fill the concrete flush with the ground's surface. Check the post level immediately after pouring, and adjust if needed before the concrete sets. Allow the concrete to cure, following the instructions on the concrete label for the appropriate curing time.
By following these steps, you will ensure that your mailbox post is securely installed and ready for attaching your mailbox.
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Using concrete to set the mailbox post
While it is not necessary to use concrete to set a mailbox post, it will help increase the stability of your mailbox. If you want your mailbox to withstand shifting temperatures, groundwater, and seasonal fluctuations, concrete will help it last longer.
- Check your local laws and regulations regarding mail service, as some areas have specific requirements.
- Dig a hole for your post, ensuring that it is in a safe area. The USPS requires that a mailbox shouldn't sit higher than 41 to 45 inches above street level.
- Place your mailbox post into the freshly dug hole.
- Prepare a bag of fast-setting concrete mix according to the manufacturer's instructions.
- Use supports to prop up the post in the hole to ensure that it is steady and does not tip from side to side.
- Use a level to check that your post is straight in the hole before you start to pour the concrete.
- Pour the concrete into the hole, leaving a few inches of space at the top. Do not fill the concrete flush with the ground's surface.
- Immediately after pouring, check the post level to ensure that your mailbox has not shifted. If it has, adjust it before the concrete begins to cure.
- Allow the concrete to cure. The length of time this will take depends on the type of concrete used. Check the concrete label for specifics.
- Leave the support beams around the mailbox until you are certain that the concrete is completely set.
Please note that the Federal Highway Administration recommends using a 4" x 4" wooden support or a 2"-diameter standard steel or aluminum pipe for mailbox supports. Avoid using unyielding and potentially dangerous materials like concrete posts, as these can be dangerous if hit by a vehicle.
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Drilling the mailbox into the wall
If your mailbox comes with an installation template, affix it to the wall to make marking the drill points easier. If not, you will need to mark where the hanging screws will go, ensuring that they are level.
The next step is to drill into the wall at the marked points. The depth of the drill holes will depend on the type of wall. For a brick or masonry wall, use a 1/4-inch drill bit and drill a shallow hole. For a wooden wall, use a 1/16-inch drill bit.
After drilling, clear out any dust from the holes with your finger, a rag, or a vacuum. If you are installing the mailbox on a brick wall, tap plastic screw anchors into the holes. Then, place the mounting bracket or hanging screws. Ensure that the screws are secure and level.
Finally, attach the mailbox to the screws. Check the mailbox's installation manual for any specific hardware requirements or additional steps.
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Frequently asked questions
First, measure and mark where you want your mailbox to be, ensuring it's at least 41 inches off the ground. If your mailbox does not come with a mounting bracket, mark where the hanging screws will go and ensure they're level. Drill holes, clear out the dust, tap the plastic screw anchors into the wall, and place the mounting bracket or screws. Finally, fit the mailbox securely onto the screws.
Choose a premade mailbox post or a 4 x 4-inch wooden post. Place the post in a freshly dug hole and use supports to prop it up. Check that the post is straight and steady before pouring quick-drying concrete into the hole.
While it's not necessary, concrete will increase the stability of your mailbox and help it withstand shifting temperatures, groundwater, and seasonal fluctuations.
Check USPS guidelines and your city ordinances to ensure that your mailbox is accessible and complies with local laws and regulations. The mailbox shouldn't sit higher than 41 to 45 inches above street level. Place it on your lawn, approximately 42 inches off the ground, and about six to eight inches from the curb.











































