100 x 100 Structural Timber Posts
100 x 100 structural timber post are one of the most commonly used sizes in outdoor and structural construction. Their square profile offers reliable support for framing, fencing, decking, and landscaping. With a practical balance of strength and simplicity, these posts are compatible with standard base plates, stirrups, and framing systems. Available in treated pine, cypress, and laminated hardwoods like Merbau, they suit both structural and architectural builds. Greenhill Timbers supplies a range of sizes and finishes, suitable for above-ground and in-ground use.
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Cypress Post 100×100 Sawn
Price range: $37.44 through $84.24 -
LOSP Post 112×112
Price range: $115.20 through $172.80 / Each -
LOSP Post 88×88
Price range: $64.80 through $97.20 / Each -
Merbau Post GL Solid Face 90
Price range: $107.81 through $274.50 / Each
100 x 100 Structural Timber Post – A Reliable Fit for Outdoor Builds
A Go-To Size for Strength and Simplicity h3
The 100 x 100 profile is used across all sorts of building jobs, from backyard pergolas to commercial decking and subfloor support. It’s strong enough for vertical loads, neat enough for visible framing, and compact enough to suit most layouts. Builders and landscapers prefer this size because it fits standard brackets and can be set in concrete or bolted to stirrups without needing extra shaping or trimming.
Posts in this profile are often used for:
- Deck and verandah supports
- Privacy screens and fencing
- Garden and retaining structures
- Entry features and outdoor frames
Material Options to Suit the Job
At Greenhill Timbers, we stock 100 x 100 posts in a variety of materials:
- Treated Pine (LOSP): For painted finishes and general outdoor framing
- Cypress: Naturally termite-resistant, often chosen for exposed builds
- Merbau Laminated: A hardwood option for a cleaner look and better weathering
Each option comes with different properties, from durability ratings to surface finishes. So whether you’re framing up or leaving it exposed, there’s something that suits.
Built for Australian Conditions
Outdoor timber needs to hold up to sun, rain, and changing temperatures. These posts are selected with that in mind. LOSP-treated options resist fungal decay, laminated hardwoods stay stable over time, and natural species like cypress can perform without chemical treatment.
Lengths typically range from 2.4 to 5.4 metres. We can help you choose the right finish and treatment based on where the posts will sit, in-ground, above-ground, or as a visual feature.
Greenhill Timbers have a great range of structural timber to complement our 100x100 posts such as the 185×185 Losp Post for strength and versatility in your outdoor and projects. With our range of options, we have the perfect solution for every design requirement — whether it is decking, pergolas or any other heavy‑duty applications suitable to builders, landscapers and homeowners alike.
Need consistent batches for a large project? Or just replacing a few deck posts? Call or visit Greenhill Timbers — we’ll help you match the right post to the job.
