Raise existing fence posts by up to one metre without digging them out. These red oxide powder-coated post extenders use inverted internal fins to grip the post in place, no bolts, no fuss. Available in 75mm and 100mm sizes.
Size
Price
QTY
75mm
£24.90£29.88
100mm
£34.90£41.88
When a fence post rots at the base but the rest of it is still sound, digging it out and starting again is a lot of work for a problem that goes about six inches deep. The red quick fit post extender is the answer to that. Slide it over the existing post stub, and the inverted fins inside grip the timber in a vice-like hold without needing bolts or fixings. Job done, height restored, fence back up before lunch.
Each box contains ten extenders, which makes this ideal for trade use where you might be replacing a full run of posts along a garden boundary or an agricultural fence line. The red oxide powder coat gives these a decent level of corrosion resistance for outdoor use, and the colour also makes them easy to spot on a busy site or in the van.
Where Red Quick Fit Post Extenders Get Used
The most common application is remedial fencing work, where the post has failed at ground level due to rot or ground movement. Rather than replacing the whole post, the extender adds up to one metre of additional height while the existing timber provides the structural base. That said, they are also useful on new builds where ground conditions or site levels make standard post height insufficient.
Sizes and Compatibility
These extenders are available in 75mm and 100mm to suit the most common fence post dimensions used in the UK. The fin grip system works on standard sawn timber posts and allows for minor variation in section size, which is handy when you are working with posts that have weathered or are not perfectly square. Check your post dimensions before ordering, as the extender needs to fit snugly to hold securely. If the post stub is very loose inside, you may need to pack it out slightly before fitting.
Buying in a box of ten keeps the unit cost down considerably compared to sourcing extenders individually, which matters when you are pricing up a fencing job and need to protect your margin.
Pro Tip: If the post stub has weathered and gone slightly undersize, pack it out with a strip of treated timber before fitting the extender so the fins have something solid to bite into.
Post extenders are used primarily in remedial fencing work across domestic, agricultural, and light commercial settings. They are particularly useful where a fence post has rotted off at or near ground level, allowing the tradesperson to extend and reuse the remaining timber rather than carrying out a full replacement. Landscapers, fencing contractors, and general builders all use them regularly. They also see use on new installations where ground levels or planning requirements call for a taller fence than standard post lengths allow.
Best For
Remedial fence post repair
Raising fence height by up to 1 metre
Agricultural and garden fencing
Avoiding full post replacement
Trade fencing contracts
Works With
75mm square timber fence posts
100mm square timber fence posts
Standard sawn softwood posts
Slightly weathered or out-of-square posts with packing
Key Features
Inverted internal fins for vice-like grip
No bolts or fixings required
Red oxide powder coat finish
Extends post height by up to 1 metre
Available in 75mm and 100mm
Box of 10 for trade use
Not suitable for: Not suitable for round or non-standard section posts. If the existing post stub is very short or severely degraded, the extender will not have enough length to grip securely and a full post replacement would be the better option.
Fit these extenders by placing the socket section over the top of the existing post stub and pressing firmly down. The inverted fins inside bite into the timber as the extender is pushed home, creating the grip that holds it in place. No drilling, no bolts. Once seated, attach the new post section or rail above as normal.
Make sure the stub is clean and free of loose material before fitting. If there is any play in the fit, pack the gap with a treated timber strip before pushing the extender down. A mallet helps seat it fully if the fit is tight, which it should be for a secure result.
Measure the existing post stub to confirm it matches the 75mm or 100mm extender size before fitting
Clear any loose rot, debris, or soil from the top of the post stub
If the stub is undersize, cut a strip of treated timber to pack the gap inside the extender socket
Place the extender socket over the post stub, keeping it plumb
Press or mallet the extender firmly down so the internal fins engage with the timber
Check for movement and confirm the extender is seated securely before continuing
Attach the new post length or fence panel fixings above as required
How much height can I add with one of these post extenders?
Each extender can add up to one metre of height to an existing fence post. The actual height you gain depends on the length of new post or extension piece you fit above it. The extender itself provides the connection point between old and new.
Do I need any tools or fixings to install these?
No bolts or fixings are needed. The inverted fins inside the socket grip the existing post stub when the extender is pressed home. A mallet is useful for seating the extender fully, especially on a snug-fitting post, but that is all the tooling required.
Constructed from steel with a red oxide powder coat finish for corrosion resistance in outdoor conditions. The internal fin system is designed to grip square timber posts mechanically without requiring drilled fixings, relying on the geometry of the inverted fins to lock under load. Available in 75mm and 100mm socket sizes to suit standard UK fence post sections.
Available Sizes
75mm, 100mm
Finish
Red oxide powder coat
Fixing Method
Internal inverted fin grip, no bolts required
Max Height Extension
Up to 1 metre
Box Quantity
10
SKU
FCA05
Application
Fence post extension and repair
Size
100mm, 75mm
Box Quantity
1
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