Can Fence Panels Be Taller Than the Posts?

 If you’re considering making your fence taller but already have existing posts in place, you might be wondering whether fence panels can extend above the posts. While it is technically possible, it’s generally not recommended for both practical and aesthetic reasons.

Why Taller Panels Are Not Ideal

Installing fence panels that are taller than the posts can lead to several issues:

Gaps Between the Panels Above the Posts - If the panels extend beyond the height of the posts, you’ll be left with visible gaps at each post, which can look uneven and unprofessional.

Lack of Support - Fence panels rely on posts for structural stability. When the tops of the panels aren’t supported, they can move in strong winds, potentially causing damage over time.

Reduced Durability - Without proper support, the top of the fence may sag, warp, or even break under pressure, reducing its lifespan.

For these reasons, it’s best to ensure that the tops of the posts are level with the panels.

An example of a closeboard fence where the panels are taller than the posts and the panels are not supported.

Stepping Panels Down Properly

When installing a fence on sloped ground, panels are often "stepped down" to follow the terrain. In these cases, it’s crucial that each post is level with the highest point of the panel next to it. If the posts remain at the height of the lower panel, the fence will look uneven and structurally weak, as the higher panel will lack proper support.

Extending Existing Fence Posts

If you want a taller fence but already have posts in place, there are ways to extend them so that they match the new panel height. The method depends on whether you have wooden slotted posts or concrete posts.

Extending Wooden Slotted Posts

The simplest way to extend wooden slotted posts is to:

1. Use an offcut of the same post type. If possible, get an offcut from the same type of wooden slotted post.
2. Wedge it between the two panels above the post. This creates a seamless extension that will support the top of the panel.
3. Secure the extension. Use screws to keep the new section firmly in place.  This will only work with good strong fence panels.

The new post extension may initially look different in colour, but it will naturally weather over time to blend in.

Do look at high quality fence panels like Jacksons that will not fall apart with a little flex.  

Extending Concrete Posts

For concrete posts, the same wedging method can be used, but to make it look visually appealing, you’ll need to:

Clad both the existing post and the new extension with timber - This creates a uniform look and covers the visible joint.

Use additional fixings if needed - Some installers reinforce the extension with brackets or specialist post extenders for extra stability.

Other Post Extension Methods

There are also various post extension devices on the market, including metal post extenders and bolt-on wooden extensions. However, these come with pros and cons, such as visibility of the join, strength concerns, and the need for additional fixings.

Security Fence Panels Being Taller Than the Posts

The concept of security fence panels being taller than the posts follows some of the same principles as traditional timber fencing. In standard fencing, the panel itself should always be supported by the posts to ensure structural stability. You wouldn't want a timber panel extending beyond the post without support, as this would make it vulnerable to movement in high winds and general wear over time. The same logic applies to mesh security fencing; an unsupported mesh panel extending above the post could be prone to flexing, weakening the overall structure.

However, in security fencing, there are several key exceptions to this principle. Many security fence panels are specifically designed to extend above the height of the posts as part of their anti-climb features. These panels often incorporate integrated deterrents, such as spikes, bent tops, or other hostile toppings, which make scaling the fence much more difficult.

For example, some high-security mesh panels have protruding spikes at the top, which are not separate additions but an integral part of the panel’s design. In these cases, the panel intentionally extends above the post to maximise security without requiring additional fixings. Similarly, some fence systems include cranked or curved extensions that allow for the installation of razor wire or electric fencing, further enhancing perimeter protection.

While this design is standard in security fencing, it is essential to ensure proper installation. The panel must remain securely fastened to the post, even if it extends beyond it, to prevent excessive movement in strong winds or under physical force. High-quality brackets, reinforced fixings, and durable materials help maintain the integrity of the fence while allowing for the added security benefits of an extended panel design.

This example of a Barbican Defender security fence shows where the panels / pales are higher than the posts.  This fence has been designed this way with the frame of the panel still supported in the posts.

So can fence panels be taller than the posts?

While fence panels can be taller than the posts, it’s not recommended due to the lack of support and poor aesthetics unless they are designed to be taller like security panels with anti climb or ornamental toppings. If you need a taller fence but already have existing posts, the best solution is to extend the posts so they remain level with the top of the new panels. Wooden posts can be extended easily with matching offcuts, while concrete posts may require cladding for a more polished look. By taking the time to extend posts properly, you’ll create a stronger, longer-lasting, and more visually appealing fence.