Typical cost in 2025
Most homeowners pay around $8,000 for a 20–30m² timber deck at ground level
What affects the price?
Deck size
A small entertaining deck (15–20m²) costs $3,000–$7,000. A medium deck (25–40m²) runs $7,000–$12,000. A large deck or multi-level structure can cost $15,000–$25,000+.
Decking material
Treated pine is the most affordable option ($150–$250/m² installed). Hardwood (Merbau, Blackbutt) costs $200–$350/m². Composite decking is $300–$500/m² but is low-maintenance and long-lasting.
Deck height
Ground-level decks are significantly cheaper than elevated structures. A raised deck over 600mm high requires deeper footings, more structural framing, handrails, and often council approval.
Balustrades and steps
Timber balustrades add $150–$300 per linear metre. Stainless cable or glass balustrades cost $400–$800/lm. Steps add $500–$1,500 depending on width and material.
Council approval
Decks under 600mm above ground generally don't need approval. Higher decks typically do. A development application costs $500–$1,500 in fees and adds 4–8 weeks to the project timeline.
Typical cost breakdown
Estimates are based on Australian average rates in 2025. Prices in Sydney and Melbourne are typically 10–20% higher than other capital cities.
Frequently asked questions
Do I need council approval to build a deck?
Rules vary by state and council, but generally: decks under 600mm above ground and under a certain area (typically 10–20m² depending on jurisdiction) don't need approval. Always check with your local council before starting.
Timber vs composite decking — which is better?
Timber is cheaper upfront but requires sealing and staining every 1–2 years. Composite decking costs more initially but is virtually maintenance-free and lasts 25+ years. For most homeowners, the long-term cost of composite is similar or lower.
How long does a deck last?
Treated pine lasts 15–25 years with regular maintenance. Hardwood lasts 25–40+ years. Quality composite decking is warranted for 25 years and can last much longer.
Can I build a deck myself?
Groundwork and basic framing can be DIY in many states, but structural work typically requires a licensed builder. Any electrical work (outdoor lighting, power points) must be done by a licensed electrician.
Does a deck add value to my home?
Yes — a quality deck in good condition typically adds $1.50–$2 for every $1 spent in most Australian markets. It expands usable living space and is highly appealing to buyers in family home markets.