There are many reasons a homeowner would want to have taller fences than they already have. For instance, you might want more privacy from passers-by and curious neighbors, or you might just like the look of a tall fence.
The good news is you might not have to start from scratch. You can make your fences taller by adding more panels or lattices. To do that, however, you’ll also need to raise the height of the posts supporting them.
It’s a cost-effective way to boost security, improve curb appeal, or make a backyard more pet-friendly. Moreover, you won’t have to tear out the entire fence line.
When and Why to Extend Fence Post Height
The most common reasons homeowners choose to install wooden fence extensions include:
- Wanting more backyard privacy from adjacent homes or busy sidewalks
- Keeping large dogs safely contained or preventing them from jumping over
- Blocking wind or creating a quieter outdoor space
- Supporting trellises, climbing plants, or privacy screens for visual appeal
Even if you hire wooden fence contractors instead of doing the project yourself, installing a fence extender is still more affordable and easier to achieve than a complete replacement.
Should You Extend a Wooden Fence Post or Replace It?
The height of a wooden fence post can be increased as long as it’s in good condition. Even if it’s partially rotted or otherwise damaged from the midway point up, you can add to its height by cutting off the affected area before installing a wooden fence post extender. However, if the entire post has issues, such as insect damage, it will need to be replaced.
Use the checklist below to help decide whether to extend or replace:
Install a wooden fence post extender if:
- Only the upper portion is weathered or cracked.
- The base is structurally sound and firmly set in concrete.
- No signs of rot, insect infestation, or deep splitting are present.
Replace the post if:
- It wobbles at the base or is pulling out of the ground.
- There is soft, crumbling wood along the entire length.
- You see termite tunnels or other signs of pest damage.
- The post leans significantly.
Simple Ways to Increase Wooden Fence Post Height
Note that to extend your wooden fence post, you’ll need a second fence post the same width and cut to the length needed for the existing fence post to reach the desired height. You can then use any of the following methods to link the fence posts together.
Use Metal Post Extenders
Typically made from strong, corrosion-resistant metal, post extenders reinforce the joints of a wooden post so that they’re capable of carrying the load of additional fence panels.
Post extenders for wooden fences come in either bracket or box styles. A bracket post extender, also called a tie plate, is a metal plate with pre-drilled holes, and you need two per fence post. Meanwhile, the box style slips over the existing post like a sleeve and is bolted in place.
If you’re using the brackets, link the two posts together. Then, affix the two plates on either side of the combined fence post using structural nails or structural screws. If possible, place them on the sides where they’re not easily visible.
If you’re using the sleeve style, simply slip it over the existing post and bolt it into place. Then, drive the new post into the sleeve and secure it with nails or screws.
Use a Wood Fence Extender
With this method, you’ll need two 1×4 pieces of lumber. You’ll face either side of the post with them. To start, affix the new post on top of the existing posts. Then, screw or nail the facer boards on either side of the post to reinforce the joints.
Use a Half-Lap Joint
This method for increasing wooden fence post height is a more complicated method than the others previously mentioned. It is best for those who have experience working with wood and can use tools such as circular saws.
Lengthening a wooden fence post using a half-lap joint involves cutting into one end of both posts so that they can fit into each other, like puzzle pieces. Accurate measurements are key to pulling this method off. Ideally, the half-lap joint should be cut six to eight inches from the end of either post.
If cut and installed correctly, the half-lap joint will be the same thickness across both posts. You can connect them permanently by driving through bolts through the part where the old and new posts meet.
Replace the Entire Post
When a post is too damaged to support an extension safely, it’s best to replace it entirely. This involves digging out the old post and concrete footing, leveling the hole, and setting a new post in fresh concrete.
If you need help with this step, consider contacting trusted wood fence contractors in your area, like NorTex Fence & Patio. Our team has the experience, skills, and equipment to get it done correctly and efficiently. For a free estimate, please get in touch.
Finishing Touches
Once the new post extensions are in place, a few extra steps can help the rest of the fence both in appearance and stability:
- Lightly sand the joints where the new and old posts meet to remove splinters and create a cleaner transition. This step is especially important if the fence will be stained or painted.
- Apply a weather-resistant wood sealer to the extension, especially at the joint, to prevent moisture intrusion and help preserve the post’s structural integrity.
- Finish by staining or painting the entire fence section, including the original post, the fence extender, and any added panels. This creates a consistent look that doesn’t draw attention to the modification.
Tips for Long-Lasting Results
Choosing durable materials and checking your work during installation can help your fence modifications last for years.
- Use pressure-treated lumber or cedar for all extensions to resist rot, termites, and outdoor weather conditions.
- Ensure all brackets, bolts, nails, and screws are rated for exterior use. They should be made of galvanized or stainless steel to prevent rust.
- Check each post extension with a level before final tightening. Even a slight misalignment can affect how straight your fence looks once panels are installed.
Common Mistakes to Avoid
Fence extenders are a smart upgrade, but skipping important details can lead to problems down the line. Here are some mistakes to avoid when installing a fence extender:
- Using a Different Wood Type: This can create visible mismatches or weaken the structure.
- Failing To Secure Fence Extenders: This can cause the added height to wobble or shift over time, especially during high winds or storms.
- Overlooking Local Codes or HOA Rules: This can result in fines, removal orders, or disputes with neighbors.
Important Considerations for Increasing Wooden Fence Post Height
Laws and Regulations
Most municipalities set limits on how tall fences can be. For instance, in Dallas, people living in duplexes or single-family homes can build front yard fences up to four feet tall and backyard fences up to eight feet tall. Make sure you have all the necessary permissions first.
Also, homeowners’ associations (HOA) often have fence line height restrictions. Before you start working on your fences, go over their rules first so you won’t run into any problems with the HOA later on.
Neighbor Boundaries
Before you modify a shared fence line, it’s courteous, and sometimes legally necessary, to inform your neighbor. If the fence lies directly on the property line, both parties may be responsible for upkeep and changes.
To avoid future disputes:
- Review your property survey to confirm the boundary.
- Discuss your plans with any affected neighbors in advance.
- Put any agreements in writing, especially if shared costs are involved.
Respecting boundaries now can save you from headaches later.
The Longevity of Your Fence
Cutting into your existing wood fence posts to increase their height can expose their interior to moisture to enter. This may result in it warping over time, leaving it vulnerable to wood rot. This is especially true for treated wood, so practice extra care when working on your fence posts or better yet, call a professional to do it for you.
A Fence Contractor You Can Rely On
NorTex Fence & Patio offers custom cedar fences that enhance the beauty of any home and may even add to its value. We have been offering our services to residential and commercial clients in North Dallas since 1998.
We take pride in our reputation for quality craftsmanship and exceptional customer care. Learn more about our services or request a free estimate by reaching out to us today.