How to Choose the Right Decking Material: Composite vs Timber vs Treated Pine

When you're planning a new deck, one of the biggest decisions is the decking material. Each option has pros and cons, and what works for one homeowner might not work for another.

Let's break down the three main choices: treated pine, timber, and composite.

Treated Pine: Budget-Friendly and Practical

Cost: $$ (Most affordable) Lifespan: 15–20 years Maintenance: High

Treated pine is pressure-treated with chemicals to resist rot and termites. It's the most affordable option and perfectly adequate for a simple deck.

Pros:

• Lowest upfront cost
• Easy to work with (builders love it)
• Readily available
• Can be sanded and re-stained

Cons:

• Requires annual staining or sealing to prevent grey weathering
• Splinters easily
• Less stable in extreme temperature swings
• Chemical treatment concerns (some homeowners prefer to avoid)

Best for: Budget-conscious homeowners who don't mind regular maintenance.

Timber (Hardwood): Beautiful and Long-Lasting

Cost: $$$+ (Premium) Lifespan: 25–40+ years Maintenance: Medium

Timber refers to solid hardwoods like spotted gum, blackbutt, or jarrah—Australian natives that are dense, durable, and gorgeous.

Pros:

• Beautiful grain and natural aesthetics
• Extremely durable (lasts decades)
• Gets better with age (develops a silver patina)
• No splinters (hardwoods are dense)
• Can be re-sanded and re-oiled if needed

Cons:

• High upfront cost (2–3x treated pine)
• Requires regular oiling (every 1–2 years) to maintain appearance
• Sourcing can be tricky (check sustainability)
• Slight movement with temperature changes (normal)

Best for: Homeowners who want a premium deck that'll last 30+ years and appreciate natural beauty.

Composite: Low-Maintenance Modern Option

Cost: $$+ (Mid-range to premium) Lifespan: 20–30 years Maintenance: Very low

Composite decking is made from wood fibres and plastic, engineered to look like timber but require minimal care.

Pros:

• Virtually maintenance-free (no staining, oiling, or sealing)
• Won't rot, warp, or splinter
• Consistent colour (doesn't fade or weather like timber)
• Stain-resistant
• Great for busy households

Cons:

• Higher initial cost than treated pine
• Can look plastic-y to some eyes
• Gets hot in direct sun (darker colours especially)
• Limited colour range compared to natural timber
• Not as "warm" underfoot as timber

Best for: Low-maintenance seekers willing to pay a bit more upfront to avoid ongoing work.

The Real-World Comparison

| Factor | Treated Pine | Timber | Composite | |--------|--------------|--------|----------| | Initial Cost | $ | $$$ | $$ | | Maintenance | High | Medium | Low | | Lifespan | 15–20 yrs | 25–40+ yrs | 20–30 yrs | | Aesthetics | Good (when maintained) | Excellent | Good (modern look) | | Durability | Moderate | Excellent | Good | | Comfort | Warm | Very warm | Can get hot |

What Do We Recommend?

At MJ Leckie Carpentry, we often recommend hardwood timber for Northern Beaches homes because:

• The salt air and humidity is tough on most materials
• Hardwoods handle coastal conditions exceptionally well
• The aesthetic is timeless and adds property value
• With proper oiling, a timber deck gets more beautiful with age

That said, composite makes sense if you're time-poor or want zero maintenance.

And treated pine is a solid choice if you're testing the waters with a first deck or working to a tight budget.

The Bottom Line

Choose based on three factors:

1. Your budget – Initial cost is real
2. Your lifestyle – How much maintenance are you willing to do?
3. How long you'll keep the deck – If you're staying 20+ years, hardwood pays for itself

Want expert advice on the right material for your space? Get a free site measure and written quote. We'll walk through options based on your situation, budget, and climate exposure.