When it comes to choosing decking materials for your Sydney home, two names consistently dominate the conversation: Modwood and Trex. Both are premium composite decking options that offer durability, low maintenance, and aesthetic appeal — but they’re far from identical. This guide compares them side-by-side so you can make an informed decision for your project.
What Is Composite Decking?
Before diving into the comparison, let’s clarify what composite decking actually is. Unlike solid timber, composite decking blends wood fibres, plastic polymers, and binding agents to create a product that mimics the look of natural wood while offering superior durability and weather resistance. Both Modwood and Trex follow this formula — but their execution differs significantly.
Modwood vs Trex: Head-to-Head Comparison
Appearance & Colour Range
Modwood excels at replicating natural timber aesthetics. Their boards feature realistic wood grain texturing and come in warm, earthy tones — Spotted Gum, Blackbutt, and Merbau-inspired finishes that blend seamlessly with traditional Australian homes. If your aesthetic leans toward “natural timber look,” Modwood delivers authenticity.
Trex offers a broader colour palette, including bolder greys, warm browns, and even contemporary charcoal finishes. Their boards tend toward a slightly more “manufactured” appearance — clean lines, consistent colouring — which suits modern and minimalist designs. Trex also offers more variation in their product lines (Enhance, Select, Premium), allowing you to match your budget to your aesthetic.
Winner: Modwood for timber authenticity; Trex for design flexibility.
Durability & Warranty
Modwood backs their standard composite boards with a 25-year structural warranty and 10-year protective coating warranty. Their Enviro range (made with recycled content) carries the same 25-year promise. In Sydney’s coastal climate, they perform consistently well — our experience shows minimal warping or discolouration over 5+ years.
Trex offers industry-leading warranties: 25-year residential warranty on most lines, with their premium Signature Collection extending protection on certain finishes. Trex also has the advantage of being CodeMark-certified in Australia, which simplifies council approvals for large projects or multi-storey applications.
Winner: Tie — both offer 25-year warranties. Trex edges ahead for CodeMark certification convenience.
Stain & Mould Resistance
Modwood uses a protective cap layer on their boards, which resists surface staining and mould growth in humid environments. Their boards are durable in wet zones (pool areas, bathrooms with outdoor decking extensions), but they do require occasional cleaning with a soft brush to prevent moss buildup in shaded areas.
Trex features their proprietary “Shellguard” protective shell on premium lines, which is marginally more resistant to staining and mould than Modwood’s standard cap. In high-humidity zones like Sydney’s Inner West, Trex maintains appearance slightly longer between cleans. However, both require regular maintenance in perpetually damp conditions — composite isn’t maintenance-free in Melbourne-like climates.
Winner: Trex (slightly), but both are excellent. The difference is noticeable only in extreme wet conditions.
Price & Value
Modwood typically costs $150–$180 per m² (materials only) for standard composite boards, with installation adding another $80–$120/m². They offer strong value for budget-conscious buyers without compromising on aesthetics or durability.
Trex ranges from $180–$220/m² for most lines, climbing to $250+/m² for Signature Collection premium finishes. Installation runs $90–$140/m². You’re paying more, but you’re getting marginally better stain resistance, more design options, and the CodeMark advantage for larger projects.
Winner: Modwood for budget; Trex if you prioritise design and don’t mind the premium.
Installation & Cutting
Modwood boards are straightforward to cut and install. Standard carbide saws handle them without issue, and fastening follows conventional decking practices. Most installers are familiar with Modwood, so labour costs remain competitive.
Trex boards are equally easy to install, but their softer composite core means they can sometimes sag slightly if undersupported — you may need closer joist spacing (350mm vs 400mm) in some applications. This adds marginal labour cost but ensures long-term rigidity.
Winner: Modwood (slightly easier out-of-the-box), but both are installer-friendly.
Environmental Considerations
Modwood Enviro uses recycled plastic and wood fibre, making it the greener choice if environmental impact matters to you. Trex also uses recycled content in their standard boards, but not as aggressively as Modwood’s dedicated Enviro line.
Winner: Modwood (Enviro specifically), though both brands are moving toward circular manufacturing.
Real-World Performance in Sydney
We’ve installed both extensively across Sydney’s northern beaches, inner west, and south suburbs. Here’s what we’ve observed:
- Coastal (salt spray, high UV): Both perform excellently. Trex holds colour marginally better; Modwood requires occasional wash. No significant difference in lifespan.
- Inner West (humid, shaded): Trex resists moss/mould slightly better. Modwood still performs well but shows earlier greening in perpetually damp corners.
- South suburbs (mixed exposure): Both excel. Choice comes down to aesthetic preference.
Which Should You Choose?
Choose Modwood if:
- You want authentic timber aesthetics at a competitive price
- Budget is a primary consideration (without sacrificing quality)
- Your design calls for warm, natural tones
- You value environmental recycling credentials
Choose Trex if:
- You want maximum design flexibility and modern finishes
- You’re building a multi-storey project requiring CodeMark certification
- Your deck will be in a high-moisture zone (pool surrounds, wet gardens)
- You prioritise best-in-class stain resistance and want minimal maintenance
Our Recommendation
For most Sydney homes, Modwood offers the best value-to-performance ratio. It’s durable, looks fantastic, and won’t stretch your budget. However, if you’re building a larger project, require design variety, or are in a perpetually humid zone, Trex’s premium features justify the cost.
The reality? Both are excellent products. Your choice should ultimately reflect your aesthetic, budget, and specific site conditions rather than perceived “superiority” of one over the other.
Ready to Choose Your Decking?
Whether you’re leaning toward Modwood’s natural warmth or Trex’s contemporary finishes, 5 Star Decking can help you make the right choice for your Sydney home. We’ve installed both materials hundreds of times and can advise on which suits your project, location, and budget.
Get a free quote today or call us on 0433 334 415 to discuss your decking project with our team.
