How Much Does a Pergola or Deck Cost in Australia? (2026 Guide)
A well-built pergola or deck transforms your outdoor living space and adds significant value to your home. But costs vary enormously based on materials, size, and site conditions. This guide covers real 2026 pricing so you can budget accurately and compare quotes with confidence.
All prices are in AUD and include GST unless otherwise noted.
Pergola Cost Summary
| Pergola Type | Cost Per m² (installed) | Typical 20m² Cost |
|---|---|---|
| Flat-roof Colorbond / polycarbonate | $185 – $350/m² | $3,700 – $7,000 |
| Gable / pitched roof | $300 – $500/m² | $6,000 – $10,000 |
| Timber frame + Colorbond roof | $250 – $450/m² | $5,000 – $9,000 |
| Steel frame + insulated panel | $350 – $600/m² | $7,000 – $12,000 |
| Freestanding pavilion | $400 – $700/m² | $8,000 – $14,000 |
| Opening louvre roof (e.g., Vergola) | $800 – $1,500/m² | $16,000 – $30,000 |
What's included
A standard pergola installation includes: footings (concrete piers or strip), frame (timber or steel), roofing (polycarbonate, Colorbond, or insulated panels), fascia and guttering, and downpipe connection to stormwater. Not usually included: ceiling fans, lighting, blinds, or council fees.
Deck Cost Summary
| Deck Type | Cost Per m² (installed) | Typical 25m² Cost |
|---|---|---|
| Treated pine | $250 – $450/m² | $6,250 – $11,250 |
| Hardwood (merbau, spotted gum) | $450 – $700/m² | $11,250 – $17,500 |
| Composite (ModWood, Trex) | $400 – $650/m² | $10,000 – $16,250 |
| Ground-level platform deck | $200 – $350/m² | $5,000 – $8,750 |
| Elevated deck (1m+ off ground) | $500 – $900/m² | $12,500 – $22,500 |
What's included
A standard deck installation includes: concrete footings, subframe (bearers and joists), decking boards, screws/fasteners, sanding and initial oil/stain, and any required balustrades. Not usually included: stairs (add $800–$2,000), built-in seating, planter boxes, or council fees.
Material Comparison — Decking
| Material | Cost/m² | Lifespan | Maintenance | Look & Feel |
|---|---|---|---|---|
| Treated pine | $250 – $450 | 10–15 years | Oil/stain every 1–2 years | Natural timber, greys over time |
| Merbau | $450 – $600 | 20–30 years | Oil every 1–2 years | Rich red-brown, premium look |
| Spotted gum | $500 – $700 | 25–40 years | Oil every 1–2 years | Variable colour, very hard |
| Composite | $400 – $650 | 25+ years | Occasional wash only | Consistent look, many colours |
Tip: Composite decking costs more upfront than treated pine but requires almost no maintenance. Over 10 years, the total cost of ownership is often similar because you avoid annual oiling and restaining. It's also splinter-free — great for families with young kids.
Treated pine
The most affordable option. Treated pine (H3 or H4 for ground contact) is readily available and easy to work with. The downside is a shorter lifespan and the need for regular maintenance. Without oiling, it greys and can warp or split.
Hardwood
Australian hardwoods like spotted gum and blackbutt are premium choices. They're naturally resistant to rot, termites, and wear. Merbau (an imported hardwood) is slightly cheaper and very popular but has environmental concerns around unsustainable logging — look for FSC-certified timber.
Composite
Made from a mix of recycled wood fibre and plastic. Composite decking is consistent in colour, doesn't splinter, and requires minimal maintenance. It doesn't have the natural warmth of real timber but comes in a wide range of colours and finishes. Leading brands include ModWood, Trex, and Ekodeck.
What Affects the Price?
Pergola pricing factors
- Roof type — Polycarbonate (cheapest), Colorbond, insulated panels (most expensive). Opening louvre roofs are 3–5x the cost of standard roofing.
- Frame material — Treated pine is cheapest, hardwood costs 30–50% more, steel costs 50–80% more but requires less maintenance.
- Attached vs freestanding — Attached pergolas (fixed to the house) are cheaper because they use the house wall as one side. Freestanding structures need additional posts and footings.
- Size — Larger pergolas cost less per m² due to economies of scale. But very large pergolas may need an engineer's design.
- Extras — Ceiling fans ($150–$350 each), LED downlights ($50–$100 each), blinds ($200–$800 per section), and outdoor heating ($500–$2,000) add up quickly.
Deck pricing factors
- Height off ground — Ground-level decks are the cheapest. Elevated decks (1m+) need engineered subframes, balustrades, and potentially council approval, doubling the cost.
- Balustrades — Required by law for decks over 1m above ground. Glass balustrades ($400–$800/m), stainless steel wire ($250–$500/m), or timber ($150–$300/m).
- Shape — Rectangular decks are simplest and cheapest. Curved edges, angles, or multi-level designs increase cutting waste and labour time.
- Subframe — Treated pine subframes are standard. Steel subframes (for elevated decks or coastal areas) cost 30–50% more but offer better span and durability.
- Stairs — Each set of stairs adds $800–$2,000 depending on height and material.
Cost by City
| City | Pergola 20m² (flat roof) | Timber Deck 25m² (merbau) |
|---|---|---|
| Sydney | $5,500 – $9,000 | $13,000 – $20,000 |
| Melbourne | $5,000 – $8,500 | $12,000 – $19,000 |
| Brisbane | $4,500 – $7,500 | $11,000 – $17,000 |
| Perth | $4,800 – $8,000 | $11,500 – $18,000 |
| Adelaide | $4,200 – $7,000 | $10,500 – $16,000 |
Do I Need Council Approval?
Pergolas
- Most councils allow pergolas under 20m² as exempt development (no approval needed) if they meet setback requirements
- Pergolas over 20m² or within a setback zone usually need a complying development certificate (CDC) or development application (DA)
- Always check your local council's specific requirements
Decks
- Ground-level decks (under 600mm) are usually exempt development
- Decks over 600mm above ground level typically require a building permit
- Decks that affect the building envelope or are close to boundaries may need a DA
- Pool decks have additional safety requirements
Tip: Even if your project is exempt development, it must still comply with the Building Code of Australia (BCA). Keep records of all materials, footings, and construction details — you'll need them if you sell the property.
Tips for Getting Quotes
- Know your materials. Decide on treated pine vs hardwood vs composite before getting quotes. This is the biggest cost variable.
- Get a site visit. The slope, access, soil conditions, and proximity to trees all affect pricing. A quote without a site visit is unreliable.
- Ask about footings. Concrete pier footings are standard but may need to be deeper in reactive clay soils. Screw piles are an alternative that's faster but more expensive.
- Check qualifications. Any structural work requires a licensed builder. For simple decks, a licensed carpenter is sufficient.
- Get 3 quotes. Pricing varies by 30–40% between builders for the same job.
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