Premier Garden Supplies Concrete Post Extenders (2-WAY STRAIGHT) W.100mm x D.100mm x Height 1ft (30cm) Designed for Flat or B
Reviewed 30 August 2026 · price checked live
Check price on Amazon →Overview
Premier Garden Supplies Concrete Post Extenders (2-WAY STRAIGHT) W.100mm x sits in our decking & fencing listings, where we rank by how buyers actually rate a product rather than by brand. The manufacturer says: Width: 100mm x Depth: 100mm with the following optional heights: 1ft (30cm), 1.5ft (45cm), 2ft (60cm) or 3ft (90cm). Simply buy the extender that matches the difference between your existing post for the new panel size to fill in the gaps.Finished off with a beautiful Post Cap with a 10mm overhang to provi. Those are the seller's own claims rather than our testing, so treat them as a starting point. On Amazon it holds 4.6 out of 5 from 142 ratings. What that score is worth next to its rivals is set out below.
- Brand
- Premier Garden Supplies
- Amazon rating
- 4.6 / 5 from 142 ratings
- vs Decking & Fencing
- 0.2 above the category median of 4.4
- Rank in category
- 10 of 30 rated decking & fencing we track
- Price position
- Among the cheaper options (category spans £7.14 to £84.99)
- How proven
- Moderate review volume
How it compares in Decking & Fencing
Across the 30 rated decking & fencing products we track, the typical score is 4.4 out of 5. This one sits at 4.6, which puts it in the upper quarter of the category rather than level with it. Where almost everything is rated well, the gap at the top is small in points and large in practice.
It carries 142 ratings against a category median of 187. That is enough of a base to take the score seriously without treating it as settled.
On price it sits in the lower third of a category running from £7.14 to £84.99, where the midpoint is about £20.99. Cheaper than most while rating at or above the category norm is the combination worth looking for, and it is the main argument for this one.
Worked out from the 30 decking & fencing products in our catalogue, not from the brand's own claims. How we rank →
Key features
- Dimensions: Width: 100mm x Depth: 100mm with the following optional heights: 1ft (30cm), 1.5ft (45cm), 2ft (60cm) or 3ft (90cm)., This post extender is designed and manufactured to sit on top of your existing concrete post (Bobble Top design)., If you have the Pyramid Top design concrete posts don't worry we have explained in our images on what to do to get this to fit with simple trimming., These extenders can be self-adjusted by simply cutting the bottom off.
- Product Dimensions: Width: 100mm x Depth: 100mm x Height: 1ft (30cm). Extend the height of your fence post with this extender. Which will allow you to install a taller fence panel. Designed to extend 2-way straight slotted concrete posts, made for bobble or flat top posts. Very simple adjustment for pyramid top concrete posts. A cost effect way of extending your current concrete posts.
- Simply buy the extender that matches the difference between your existing post for the new panel size to fill in the gaps.Finished off with a beautiful Post Cap with a 10mm overhang to provide greater protection from water ingress and ensure the post extenders lasts for may year.
- Our wood products are all pressure treated using Tanalith E, green flecks may appear within the wood but will fade over time as the products weather.
