---
title: "Timber Decking Cost Per Square Metre AU 2026: Your Ultimate Backyard Guide"
description: "Uncover 2026 Australian timber decking costs per square metre. Get expert breakdowns for Treated Pine, Merbau, Spotted Gum, and navigate council rules."
source: BackyardCost
sourceUrl: https://backyardcost.com/guides/timber-decking-cost-per-square-metre
lastUpdated: 2026-06-06
citationUrl: https://backyardcost.com/guides/timber-decking-cost-per-square-metre
---

# Timber Decking Cost Per Square Metre AU 2026: Your Ultimate Backyard Guide

Uncover 2026 Australian timber decking costs per square metre. Get expert breakdowns for Treated Pine, Merbau, Spotted Gum, and navigate council rules.

Uncover 2026 Australian timber decking costs per square metre. Get expert breakdowns for Treated Pine, Merbau, Spotted Gum, and navigate council rules.

Planning a new timber deck for your Australian backyard in 2026? Understanding the “timber decking cost per square metre” is crucial for budgeting and making informed decisions. Many homeowners compare the initial outlay of wood against the long-term composite vs timber decking cost. From the classic appeal of Treated Pine to the luxurious finish of Spotted Gum, the choices are vast, and so are the price tags. This comprehensive guide, crafted by our expert Australian construction cost estimators, will break down everything you need to know to build your dream outdoor living space. This costing methodology aligns with national industry benchmarks published by the Housing Industry Association (HIA).

Understanding Timber Decking Costs: Materials & Breakdown (2026)

Treated Pine is the most economical and widely used option for decking in Australia, particularly for subframes due to its durability against rot and pests. As a decking surface, it’s versatile and can be stained or painted to achieve various looks.

Merbau is a popular imported hardwood known for its rich reddish-brown colour, durability, and natural resistance to rot and insects. It’s a step up in price and offers a more premium look than Treated Pine.

### Key Takeaways

### 1. Treated Pine Decking

### 2. Merbau Decking

### 3. Spotted Gum Decking

### Complying Development Certificates (CDC) vs. Council Approval

## Professional Installation vs. DIY: Making the Right Choice

### Professional Installation

### DIY Installation

### James Thornton

#### Calculators

#### Resources

#### Compliance

## Key Points

- Material is King: The type of timber (Treated Pine, Merbau, Spotted Gum) is the primary driver of your decking cost per square metre.
- Professional Installation Adds Value: While DIY can save on labour, professional installers ensure compliance, quality, and longevity, often ranging from $80-$150 per square metre for labour alone.
- Don’t Forget the Subframe: A robust subframe (often Treated Pine or steel) is essential and contributes significantly to the overall cost.
- Council Regulations Matter: Complying Development Certificates (CDC) or local council approvals are often required, especially for decks above certain heights or near boundaries.
- Pros: Cost-effective, readily available, easy to work with, takes stains well.
- Cons: Softer timber, prone to denting, requires regular maintenance (staining/sealing) to prevent weathering and splintering.
- Lifespan: 15-25 years with proper maintenance.
- Pros: Very durable, naturally resistant to pests and rot, beautiful rich colour, stable.
- Cons: Can “bleed” tannins when first exposed to rain (requires careful initial washing), heavier to work with, higher cost.
- Lifespan: 25-40+ years with proper maintenance.

---
*Source: [BackyardCost](https://backyardcost.com/guides/timber-decking-cost-per-square-metre)*