Timber vs Composite Decking: Which Is Best for Gold Coast Homes?

The deck is where Gold Coast life actually happens. Morning coffee, kids running from the pool, weekend barbecues, sundowners with the neighbours - the outdoor room does the heavy lifting eight months of the year. Which is why the choice between timber and composite decking is one of the highest-stakes calls in any outdoor renovation. Get it right and it lasts twenty years without a thought. Get it wrong and you're re-oiling every twelve months or watching boards cup within two summers. This guide compares timber and composite decking honestly - the real costs, real lifespans and real coastal performance we see across the Gold Coast in 2026.

Table of contents

• Timber decking - species, look and feel
• Composite decking - what it actually is
• Cost comparison (2026 pricing)
• Lifespan and durability
• Maintenance requirements
• Coastal performance
• Pool areas
• Outdoor entertaining and design
• Council approvals and QBCC compliance
• Balustrades, lighting and finishing touches
• Which one should you choose?
• FAQs

Timber decking

Hardwood decking is the classic Australian look - warm, natural, and it develops a beautiful silvered patina if you let it weather. The most common species we install on the Gold Coast are spotted gum, blackbutt, merbau, ironbark and, at the premium end, modified timbers like Accoya.

Spotted gum

Class 1 durable Australian hardwood. Gorgeous grain, warm tones ranging from honey to chocolate, holds up beautifully in the Queensland climate. Our most-installed timber deck on the Gold Coast.

Blackbutt

Lighter in colour than spotted gum, very stable and BAL-29 rated for bushfire zones. Popular in Mudgeeraba and hinterland suburbs.

Merbau

Cheaper imported hardwood, warm red-brown tones. Bleeds tannin heavily in the first year - not our first choice near white render or light paving.

Modified timbers (Accoya, Kebony)

Premium option, dimensionally stable, 25-50 year warranties, but priced accordingly.

Composite decking

Composite decking is a manufactured board combining recycled wood fibres with polymers and pigments, capped with a durable polymer wear surface. The leading brands on the Gold Coast are Trex, Ekodeck, ModWood and Millboard. Modern capped composites have solved most of the fade and stain issues of first-generation products.

How composite is made

Wood flour is bonded into a rigid board with polyethylene or PVC. A capped composite has a co-extruded polymer skin on 3 or 4 sides, giving UV and stain resistance. Uncapped composite is cheaper but less durable in the Gold Coast sun.

Cost comparison (2026 pricing)

Supplied and installed rates

• Merbau: $380-$500 per m²
• Spotted gum / blackbutt: $480-$650 per m²
• Ironbark: $550-$720 per m²
• Modified timber (Accoya): $700-$950 per m²
• Standard capped composite (ModWood, Ekodeck): $580-$780 per m²
• Premium capped composite (Trex Transcend, Millboard): $750-$1,050 per m²

The upfront gap is real but narrower than it looks. Over a 20-year life, composite typically comes out cheaper once you factor in re-oiling costs and eventual board replacement.

20-year total cost of ownership

• Merbau deck 30m² @ $450/m² + annual oil ($400/yr) = $19,500
• Spotted gum deck 30m² @ $560/m² + annual oil = $24,800
• Composite deck 30m² @ $680/m² + minimal maintenance = $21,000

Lifespan and durability

• Merbau: 15-25 years
• Spotted gum / blackbutt: 25-40 years
• Ironbark: 40-50 years
• Modified timber: 30-50 years
• Standard capped composite: 20-25 years
• Premium capped composite: 25-30 years with manufacturer warranty

Maintenance

Timber maintenance schedule

1. Clean twice a year with a soft-bristle broom and mild detergent
2. Re-oil every 12-18 months (Cutek, Intergrain, Sikkens)
3. Check and replace fixings every 5 years in coastal exposure
4. Sand and re-oil every 8-12 years for a full refresh

Composite maintenance schedule

1. Sweep and hose off monthly
2. Wash annually with a soft brush and composite cleaner
3. No oiling, staining or sealing required

Coastal performance

Everything within 3km of the Gold Coast beaches sits in the primary coastal exposure zone. Fixings, framing and finish choice all need to reflect that. We specify:

• 316 marine-grade stainless screws for all decking - always
• H3 or H4 treated pine framing minimum, H4 preferred within 1km of surf
• Powder-coated aluminium or hardwood posts, not untreated softwood
• Concealed clip systems on composite to eliminate face-fixings and corrosion points

In suburbs like Currumbin, Tugun, Palm Beach, Broadbeach and Coolangatta, we push clients hard toward composite or ironbark - both handle salt spray better than lower-density timbers.

Pool areas

Pool decks add a layer of complexity - chlorine, salt, wet feet, sunscreen and constant UV. Both timber and composite work around pools if you specify correctly.

Timber around pools

• Choose dense hardwoods only - spotted gum, blackbutt, ironbark
• Increase gap spacing to 5-6mm for water dispersion
• Expect more frequent oiling - chlorine strips coatings

Composite around pools

• Capped composite is ideal - no staining from sunscreen, no splinters, no oiling
• Confirm slip rating - most premium composites have a good coefficient of friction wet
• Boards don't cup like timber under constant wet-dry cycles

Outdoor entertaining and design

The deck is only as good as the space above it. A great outdoor room usually pairs the deck with:

• A roof or pergola that manages the western sun
• Ceiling fans and infrared heaters for year-round use
• Integrated LED lighting - stair treads, perimeter, uplights
• A screen or planter wall for privacy from the neighbours
• A dedicated BBQ or outdoor kitchen zone with power and gas

The best outdoor rooms we deliver in Mermaid Waters, Robina and Hope Island are the ones that read as an extension of the living room, not an afterthought bolted onto the back of the house.

Council approvals and QBCC compliance

Decks over 1m in finished height require balustrading to National Construction Code standards. Anything attached to the house typically needs a building approval through a private certifier. Freestanding structures under a certain size may be exempt but must still comply with structural, wind and fire requirements.

As a QBCC-licensed and fully insured builder, we handle certifier engagement, engineering where required, and Queensland Home Warranty Insurance on every deck project over $3,300 - which is the vast majority.

Balustrades, lighting and finishing touches

• Frameless glass balustrade - premium, unobstructed views, ideal for pool decks
• Stainless wire balustrade - warm coastal look, ties timber and steel together
• Aluminium slat screens - privacy from neighbours without blocking breeze
• Recessed LED stair lighting - a genuine safety feature that also looks incredible
• Ceiling fans and roof-mounted heat strips for shoulder-season use

Timber vs composite - which one should you choose?

Choose timber if...

• You value natural material and are happy to maintain it
• You want the deck to weather to a silvered patina
• Your budget prioritises upfront cost over long-term ownership cost
• You're building a character home where the timber look is architectural

Choose composite if...

• You want to hose it off and forget about it
• The deck is around a pool or in heavy coastal exposure
• You want a guaranteed warrantied lifespan
• You're not prepared to re-oil every year

Common mistakes to avoid

• Using galvanised instead of 316 stainless fixings within 3km of the coast
• Undersized joist spacings that cause bounce or long-term deflection
• Skipping the flashing where the deck meets the house wall
• Laying timber straight from the pack without acclimatisation
• Using face-screws through composite instead of concealed clips
• Building without a certifier when one was required - it comes back at sale

Expert tips

• Design the deck around a piece of furniture - the outdoor dining table or a specific lounge setting - so you know it actually fits
• Run boards parallel to the longest edge of the deck for the most premium look
• Add a step down to grass or paving to break the plane and prevent a 'stage' look
• Pre-plan power, gas and water outlets during construction - retrofitting is expensive
• Photograph the framing before you close it in - invaluable for future maintenance