Square Fence Posts

Square fence posts are a reliable and widely used solution for supporting fencing, gates, and structural landscaping features. At Suregreen, we supply a range of pressure treated softwood square fence posts and oak fence posts, suitable for both domestic and professional applications. 

Available in multiple lengths and thicknesses, our square posts are commonly used as anchor posts, intermediate supports, and gate posts, providing the strength and stability required for long-lasting fence installations. 

Square Fence Post Materials & Treatments 

We supply square fence posts in the following options to suit different project requirements and finishes: 

Pressure Treated Softwood Fence Posts – Green & Brown 

Our softwood square fence posts are pressure treated to protect against rot, fungal decay, and insect attack, making them suitable for ground contact and long-term outdoor use. 

• Green treated fence posts – a traditional treatment finish commonly used for general fencing and construction

• Brown treated fence posts – treated to the same standard as green posts, with a darker finish that blends more naturally into garden and landscaped environments 

Both treatments offer excellent durability and are ideal for fencing, post and rail systems, and gate installations. 

Oak Fence Posts 

Oak square fence posts are naturally durable and do not require pressure treatment. Known for their strength and longevity, oak posts are commonly used where a premium finish or additional structural performance is required. 

• Naturally resistant to decay

• Ideal for gate posts, estate fencing, and traditional or rural settings

• Weathers over time to a silver-grey finish 

Oak fence posts are particularly popular for long-term installations and projects where appearance is as important as performance. 

Available Sizes 

Our square fence posts are available in a range of standard sizes, including: 

• Lengths: 1.8m, 2.1m, 2.4m, and 3.0m

• Thicknesses: 75mm x 75mm and 100mm x 100mm 

This allows you to choose the correct post size based on fence height, ground conditions, and load requirements. 

Typical Uses for Square Fence Posts 

Square fence posts are commonly used for: 

• Supporting timber fence panels

• Gate hanging and gate support posts

• Post and rail fencing

• Agricultural and equestrian fencing

• Landscaping and garden structures

• Boundary and perimeter fencing 

For gates or high-load areas, larger section posts or oak posts are recommended to provide additional strength and stability. 

Pressure Treatment & Durability 

Pressure treated softwood fence posts are treated using preservative forced deep into the timber under pressure. This significantly extends service life and helps protect against: 

• Rot and fungal decay

• Insect infestation

• Moisture damage when installed in ground contact 

Colour variation between green and brown treated posts is cosmetic only — both offer the same level of protection and performance. 

Responsibly Sourced Timber 

All timber used for our softwood square fence posts is sourced from responsibly managed forests. Where applicable, posts are supplied from FSC® or PEFC certified sources, supporting sustainable forestry practices. 

Completing Your Fence Installation 

To ensure a secure and long-lasting installation, we also supply compatible fencing components, including: 

• Postcrete / Postmix

• Gravel boards

• Fence panels and rails

• Fixings and accessories 

Using the correct post size and installation method will improve fence stability and extend service life. 

Buy Square Fence Posts Online 

Browse our range of square fence posts, including green treated, brown treated, and oak fence posts, available for delivery across the UK. If you need help choosing the correct post size or material for your project, our team is available to provide practical advice.