Most of your time is spent waiting for the concrete to harden.
Cost
$10–$250
Put your money toward future projects.
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What you'll need:
TOOLS
Shovel
Level
Paint stick
Screwdriver
Tamper
Trowel
Gloves
Scissors
SUPPLIES
Two-by-four-by-eight pieces of wood
Screws
Quick-set concrete mix
Steel angles (optional)
A fence that’s leaning isn’t only an eyesore—it’s also a safety issue. Luckily, with a little time, effort, and a trip to the local hardware store, an average DIYer can fix a leaning fence. In this blog, we’ll cover how to diagnose the issue and how to straighten a fence post in just a day.
Prepping to Fix a Leaning Fence Post
A leaning fence post isn’t something to ignore. If you leave it too long, you risk causing more expensive damage or a break-out from your furry friend. Before you begin, it’s important to figure out what the issue is, so you know how to repair a leaning fence properly. Also, you’ll want to contact your neighbor if you share the fence.
Diagnose the Issue
It’s important that you first diagnose why the fence post is leaning in the first place. Hopefully, it’s something as easy to spot as not having enough dirt around the post or just needing reinforcement. If your issue is a step beyond that—like rotting wood or a bent metal post—hire a fence repair pro near you to help.
Contact Your Neighbor
If you share your fence with a neighbor, now would be a good time to let them know you’re working on the issue. You’ll likely need to get on their side of the fence during this process, and they’ll need a heads-up. Sometimes, they may also need to pay for half of the repair.
Relieve Pressure From the Post
Photo: Hill Street Studios / DigitalVision / Getty Images
To work on the leaning post, you need it to be free from the pressure of the entire fence. Start by wedging a few pieces of two-by-four 8-inch wood between the ground and the fence panels on both sides. If you can only access one side of the fence, remove the pickets from either side of the post to create a bracing system.
There’s no real right or wrong way to do this as long as the fence is supported. If you don’t have extra wood lying around or don’t want to go buy some for this project, you can also get creative and use long shovels or rakes as braces.
Once the weight of the braces supports the fence panels, you can start removing the horizontal stringers off the post. You’ll likely need a screwdriver or nail remover, depending on how they're attached.
Take your shovel and dig a hole around the leaning fence post. You may hit a large chunk of concrete from the original fence post installation project. There’s no need to remove this concrete. Instead, focus on removing enough dirt around it so you can move and straighten the post as needed.
Straighten the Fence
Photo: Arpad Nagy-Bagoly / Adobe Stock
Now that you can move the post around, it’s time to follow the steps for how to straighten a fence post. Get the post into the correct position. Use your level to make sure your fence post is straight. If you have extra braces, brace the now-straight fence post to stay in the right spot while you refill the hole in the next step.
You have three options for refilling the hole: a mixture of sand and gravel, quick-setting concrete, or expandable foam. Concrete and expandable foam will be stronger, but you may already have sand and gravel at hand that you want to use. Whatever option you use, wear gloves to protect your hands.
If you can pick up and remove the fence post fully, we recommend adding a layer of gravel before you refill the hole. This will help give moisture a place to go that isn’t your wood to help prevent wood rot. If you already have some rot and want extra support, you can attach steel angles with screws before refilling the hole with your preferred method.
Using Sand and Gravel
When using sand and gravel, fill your hole with 1 part small gravel to 1 part wet sand. Use a tamper to pack it down. Once the sand is dry, you can reattach your fence panels. Only use this option if your ground is relatively dry and rocky.
Using Concrete
Concrete may be a better option if you experience a lot of moisture in your area. After adding the layer of gravel, pour the concrete mix into the hole, then slowly pour a gallon of water on top; use a paint stick to mix it up if needed. The concrete should be slightly above ground level. Before it hardens, take your trowel and create a slight downward slope toward the ground so water can run away from the post.
The concrete will take about an hour to harden. But you should wait four to six hours before reattaching your fence panels.
Using Expandable Foam
Before using expandable foam, double- and triple-check that your pole is in place. While sand and concrete give you a bit of leeway in terms of adjustment after the fact, the expandable foam does not. At best, you have only a few minutes to adjust the pole after application before it’s mostly fixed.
Mix your resin following the manufacturer’s instructions. Cut the corner of the bag with scissors and immediately pour the mix into the hole. Quickly readjust your post as needed and wait two hours before reattaching your fence panels. If the foam expands anywhere you don’t want it to, cut it away with scissors or your shovel.
It’s time to reattach the fence panels and rails. Simply attach them to the existing holes using screws (potentially new ones if necessary) and a drill. Your fence should be sturdy now!
DIY vs. Hiring a Pro
If you already have most of the materials around your house, like extra wood for braces, the main cost of this DIY is a few bags of your setting material.
Fast-setting concrete: These cost about $10 per bag, and you’ll need about one bag per leaning post.
Sand and gravel: You can get some sand and gravel mix for as low as $10, although you may already have some you can use.
Expanding foam: These cost about $20 per bag, and you’ll need about one bag per leaning fence post.
If your post is rotting or breaking, you may also consider purchasing and installing a steel wedge repair bracket, which will cost you an additional $30 to $50 per piece. In some cases, this may buy you more time with your fence before you need to hire a repair company; in other cases, it’s a temporary fix that won’t get you very far.
If you choose to pay the cost of professional fence repair, expect to spend between $310 and $900. Your cost will depend on a few things, like the materials required and the extent of the damages. But, if your issue is more than just a simple leaning post, paying for professional support from the beginning of the project can get you better results without running the risk of more damage from insufficient repairs.
Frequently Asked Questions
Concrete is one of the easiest, most cost-efficient, and most effective ways to stabilize a fence post. To stabilize a fence post with concrete, you’ll dig a hole around the post in question and fill it up with concrete—easy as that. Concrete lasts about 50 years on average, so it’s a long-term solution.
If you don’t want to use concrete to fix your leaning fence post, you can opt for crushed gravel, sand, or soil instead. You can also use expandable foam, although this may offer some of the same drawbacks as concrete when looking for an alternative. None of these options are as durable and sturdy as concrete, but they’re better for temporary fencing.
There isn't a winner when comparing expanding foam versus concrete for fence posts. Both have benefits and drawbacks, depending on your budget and priorities. Expanding foam may be a better choice if you want a more eco-friendly solution that cures faster. Concrete is more affordable and durable than expanding foam, yet it is harder to work with and takes longer to cure.
Concrete does not stop wooden posts from rotting. When water gets stuck in concrete, the wood will rot. That’s because concrete holds moisture and a constant temperature, which is like a pressure cooker for wood rot.
To help prevent wood rot when using concrete, create a system that allows water to flow away from the posts. You can use a gravel base in the bottom of the hole and shape the concrete into a slight slope so water flows away from the wood.
Ideally, your concrete should set slightly above ground at an angle sloping away from the fence post. This will add extra support and allow water to run away from the wood fence post. Keeping water out will help prevent wood rot. Additionally, you can add soil on top of the concrete for a seamless finish.
Taylor Sansano is a full-time freelance writer specializing in helping readers make better decisions — whether that's deciding what type of wood to use when building a deck or how to choose the best company for their needs.
Taylor Sansano is a full-time freelance writer specializing in helping readers make better decisions — whether that's deciding what type of wood to use when building a deck or how to choose the best company for their needs.
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