4x4 fence posts

4x4 fence posts (approximately 100mm x 100mm) are widely used in structural timber applications including heavy-duty fencing, decking supports, gate posts, and small structural frames. Their larger cross-section provides increased load-bearing capacity and stability, making them suitable for use where strength and durability are critical. You’ll typically install these posts with concrete footings or steel post anchors depending on soil conditions and required longevity.

Modern construction practices favour pressure-treated softwood for 4x4 posts due to its cost efficiency and resistance to rot, though hardwood options remain in use for higher-spec or exposed settings. Posts are commonly supplied in lengths from 1.8 to 2.7 metres (6ft to 9ft) and are available sawn, planed, or incised for improved treatment penetration. Many are compatible with post caps, fence rails, or bracket systems to support faster, more consistent installation on-site.

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