Fence Post Treated Green 100 x 100mm x 2.4m
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This is a pressure-treated softwood fence post, coloured green from the preservative treatment to help protect against rot, decay and insect attack when used outdoors in contact with the ground. The 100 x 100mm (roughly 4 x 4 inch) section makes it strong and stable, ideal for standard garden fencing, gates and pergola corner posts. At 2.4m long, it suits typical 1.5–1.8m high fence panels once you allow for the part buried in the ground and any gravel board. It is usually set in a concrete or post mix footing, or in metal post spikes, to create a solid, long-lasting support for timber fence rails or panels. The “treated green” finish can be left as is or painted/stained once dry to match your garden style.
As of August 2026, PriceNailer data confirms that the cheapest price for Fence Post Treated Green 100 x 100mm x 2.4m is £13.97 from Selco across 5 suppliers. Prices have increased by 1.0% over the last 9 months.
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Frequently Asked Questions
How deep should I bury a 100x100mm fence post?
For a 2.4m fence post, bury approximately 60-75cm (one-third of the total length) in the ground. This provides adequate stability for standard fence panels up to 1.8m high, leaving around 1.65-1.8m above ground level.
What's the difference between treated green and brown fence posts?
Both use pressure-treated timber for protection against rot and insects. The green colour comes from copper-based preservatives, while brown posts use different treatment chemicals. Performance-wise, they're equivalent - the choice is purely aesthetic.
Can I paint over a treated green fence post?
Yes, but the post must be completely dry first, which can take 2-6 months depending on weather conditions. Use a high-quality exterior wood stain or paint designed for treated timber for best adhesion and durability.
How much concrete do I need per fence post?
For a 100x100mm post, you'll need approximately one 20kg bag of postcrete or concrete mix per post. Dig a hole 300mm wide by 600-750mm deep, position the post, then add the concrete mix and water.
What spacing should I use between 100x100mm fence posts?
Standard spacing is 1.8-2.4m between post centres, depending on your fence panel width. Most UK fence panels are 1.8m wide, so posts are typically spaced at 1.83m centres to allow for the post width.