Fence Post Treated Green 100 x 100mm x 3m
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This is a 100 x 100mm (4 x 4 inch) green pressure-treated timber fence post, 3 metres long, designed for strong, long-lasting garden fences and similar structures. The green treatment helps protect the wood against rot, decay, and insect attack, making it suitable for outdoor, in-ground use. Its chunky 100 x 100mm size gives extra stability for taller fence panels, gates, pergolas, or heavy-duty runs of fencing. At 3m long, it can be set deep into the ground while still providing good height above ground for most domestic fence designs. Use with concrete or post mix in properly dug post holes to create a solid, durable fence line.
As of June 2026, PriceNailer data confirms that the cheapest price for Fence Post Treated Green 100 x 100mm x 3m is £17.46 from Selco across 4 suppliers. Prices have increased by 48.4% over the last 6 months.
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Frequently Asked Questions
How deep should I bury a 100x100mm fence post?
For a 3m fence post, bury approximately 60-90cm deep (one-third of the total length). This provides adequate stability for most domestic fencing, especially when set in concrete or post mix.
What spacing should I use between 100x100mm fence posts?
Standard spacing is typically 1.8m to 2.4m between posts, depending on your fence panel size. Most UK fence panels are 1.8m wide, so posts are usually placed at 1.8m centres.
Will green treated timber fence posts fade over time?
Yes, the green colour from pressure treatment will gradually fade to a natural grey/silver colour when exposed to UV light and weather. This typically takes 1-2 years but doesn't affect the timber's protective treatment.
Can I use 100x100mm fence posts for heavy gates?
Yes, 100x100mm posts are suitable for most domestic gates due to their substantial size. For very heavy or wide gates, consider using concrete fence posts or steel reinforcement for additional strength.
What's the difference between 75x75mm and 100x100mm fence posts?
100x100mm posts are significantly stronger and more stable than 75x75mm posts. Use 100x100mm for taller fences (over 1.5m), heavy panels, gates, or where maximum longevity is required.