Yes, you can move your mailbox to the other side of your driveway, but you have to get your local postmaster’s approval before you dig. USPS requires advance sign-off on any mailbox installation, move, or replacement, and the new spot has to meet the same height, setback, and route-side rules as the old one.1USPS. Requirements for City Delivery Mail Receptacles A shift of a few feet along the same curb is usually approved without much fuss.
Get Postmaster Approval First
Before you pull the post, call your local post office or flag down your regular carrier. All mailboxes must be approved by the Postal Service, and that includes moves.1USPS. Requirements for City Delivery Mail Receptacles You can look up your post office’s contact information at usps.com.
The conversation itself is simple. Tell the postmaster where you want the new box and why. In some cases a USPS representative will come out to check that the proposed spot meets the placement rules and doesn’t create a hazard for the carrier. If it works, you’re cleared to proceed. If it doesn’t, the postmaster will tell you what needs to change.
Skipping this step has a real cost. If a USPS employee is impeded from reaching your mailbox, the postmaster can withdraw delivery service.1USPS. Requirements for City Delivery Mail Receptacles No mail until the problem is fixed. Homeowners routinely assume a small move along the same curb doesn’t need permission. It does.
Where the New Box Has to Sit
Wherever you put it, the mailbox has to meet USPS measurements. The bottom of the box or the mail entry point must be between 41 and 45 inches above the road surface, and the front face has to sit 6 to 8 inches back from the curb.2USPS. How to Install a Mailbox – Section: Where to Place the Mailbox Those dimensions let the carrier reach in from the vehicle without stretching or getting out. If your street has no raised curb, ask the postmaster what setback to use.
Your house or apartment number has to appear on the box. If the mailbox is on a different street than your home, put the full street address on it.3USPS. How to Install a Mailbox Faded numbers are one of the most common things flagged during carrier inspections, so refresh them while you’re doing the work.
The approach to the box also has to stay clear year-round. Bushes, parked cars, trash cans on delivery day, and snow piles all count as obstructions. When you’re picking the new location, pick a spot you can realistically keep open in every season.2USPS. How to Install a Mailbox – Section: Where to Place the Mailbox
Which Side of the Road the Box Must Be On
Sliding the box a few feet along your own curb is one thing. Putting it across the street is another. USPS requires mailboxes to be on the right-hand side of the road in the carrier’s direction of travel wherever crossing to the left would be unsafe or would violate traffic laws. On new rural and contract delivery routes, all mailboxes must be on the carrier’s right-hand side.4USPS. Postal Bulletin – Location
For most driveway moves this doesn’t come into play, because you’re staying on the same side of the road. It matters if your driveway is on a corner lot and the “other side” faces a different street, or if the move would actually put the box across the road. In either case, confirm with the postmaster that the new spot lines up with the carrier’s route direction before you commit.
Call 811 Before You Dig
A mailbox post hole runs 18 to 24 inches deep, which is plenty of depth to hit a buried utility line. Gas, electric, water, and communication lines often run along the road right-of-way in the exact strip where mailboxes sit. Federal pipeline safety law (49 U.S.C. ยง 60101 et seq., as amended by the Pipeline Safety Improvement Act of 2002) requires excavators to contact their local one-call center before digging, and every state has implemented this through the 811 system.
Dial 811 at least a few business days before you plan to start. The call is free. Utility companies will send locators to mark their buried lines with color-coded paint or flags at no charge: red for electric, yellow for gas, blue for water, orange for communication. Wait for all lines to be marked before you break ground. A post-hole digger through a gas line turns a Saturday project into an emergency.
Use a Post That Will Give Way
A mailbox post is a roadside object that a vehicle could hit, so it needs to bend or break on impact rather than punch through a windshield. The Federal Highway Administration recommends a 4-by-4-inch wooden post or a 2-inch-diameter standard steel or aluminum pipe. Heavy metal pipes, concrete posts, and anything else that won’t give way in a collision are out.3USPS. How to Install a Mailbox
The AASHTO guide for highway mailbox installations reinforces the same idea: supports should be no more substantial than needed to resist normal loads. Wood posts around 4 inches should be treated as both the minimum and maximum recommended dimension. Metal posts should not be fitted with anchor plates and should be embedded no more than about 24 inches into the ground.5AASHTO. A Guide for Erecting Mailboxes on Highways An over-rigid post is a traffic hazard and can create liability for you if a driver is hurt.
Local Ordinances and HOA Rules
The USPS standards are the floor. Cities and counties sometimes add their own requirements: a larger minimum setback from the pavement edge, restrictions on post materials near intersections, or placement rules meant to keep boxes out of snowplow paths.
If you’re in a homeowners association, expect another layer. HOA covenants often dictate mailbox style, color, material, and exact placement relative to property lines. Some communities require shared mailbox clusters instead of individual curbside boxes. An HOA violation won’t stop your mail, but it can bring fines or a forced removal at your expense. Check your HOA documents and your local government’s website before you commit to a spot.
In snow country, placement also decides whether the box survives the winter. Many municipalities will repair or replace a box the plow physically strikes but won’t cover damage from snow thrown off the blade. A box set at the full 8-inch setback with a breakaway post has a much better chance of making it through the season intact.