How Much Does Decking Cost?

A well-designed deck can transform your outdoor space, creating the perfect area for entertaining, relaxing or simply enjoying the Australian lifestyle. Decking not only adds functional living space but can also increase the value of your property and enhance its overall appearance.

But before you start planning your new deck, it’s important to know: how much does decking cost? The price varies depending on the materials you choose, the size and shape of the deck, and how complex the installation is. On average, decking in Australia can range from affordable softwood options through to premium hardwood or composite boards that are designed to last for decades.

How Much Does Decking Cost?

In this guide, we’ll cover everything you need to know about decking costs in Australia, including:

• What factors affect the price of decking

• The average cost per square metre for different materials

• Installation and hidden costs to consider

• State-by-state cost differences

• The benefits of adding a deck to your home

• How to find the right decking installer for your project

What Factors Affect the Cost of Decking?

The cost of building a deck in Australia depends on several important factors. The type of material you choose is usually the biggest influence. Treated pine is one of the most affordable options, while hardwoods like merbau or spotted gum sit at the higher end. Composite decking and modular systems cost more upfront but often save on maintenance over time.

Deck size and shape also play a major role. Larger decks require more materials and labour, while irregular shapes, curved edges or multiple levels increase the complexity and therefore the price. Elevated decks, or those built on sloping blocks, often need stronger supports, posts and footings, which can add significantly to costs.

The complexity of installation is another factor. A simple ground-level deck is far quicker to install than a raised or multi-storey structure that may also need handrails, stairs or balustrades for safety. These extras not only add to material costs but also require more skilled labour.

Your location and local labour rates will also affect pricing. In metropolitan areas, where demand for tradies is higher, labour costs are generally more expensive than in regional towns. Access to your property can also be a consideration, with difficult sites adding time and expense.

Finally, the finishes and extras you choose will influence the total budget. Stains, oils, built-in lighting, seating or integrated planter boxes can all elevate the look of your deck but will increase the cost.

Average Cost of Decking in Australia

In Australia, the cost to build a deck can vary widely depending on the materials, design complexity, site conditions and region. Here’s a breakdown of typical ranges you might expect for supply + installation:

• Basic timber decks (e.g. treated pine) typically start around AUD $200 per square metre. 

• For hardwood timber decking, costs often begin at $320+ per square metre. 

• Composite decking, which is low-maintenance and higher-end, frequently starts from around $350+ per square metre. 

• More complex decks (elevated, with stairs, or cyclone-rated) can reach into the $800+ to $1,000+ per square metre range.

For typical timber decks, many homeowners see costs clustering between $300 to $400 per square metre.

Also worth noting:

• For a basic 6 × 8 m deck (≈ 48 m²), you might expect costs in the range of $120 to $180 per m² for Merbau or timber options (this includes base materials and hardware).

• In some guides, overall deck costs (materials + labour) are quoted more broadly between $200 and $1,000 per m² to capture the full spectrum of possibilities.

These figures are intended as rough guides. Your final cost will depend heavily on your location, material choice, deck height, design complexity and site preparation requirements.

Decking Installation Costs

Installing a deck involves more than just laying boards — the structural work, support framing and finishing touches are what often make up the bulk of the cost. In Australia, for typical residential decks, installation (labour + materials for substructure) often sits between AUD $200 and $1,000+ per square metre depending on the type of material and complexity of the build.

For standard timber decks (e.g. treated pine), many homeowners report costs closer to $300–$400/m² for a well-executed job (including frame, structure, and basic finishing) on a moderately simple site.

However, if your deck is elevated, on a slope or includes stairs, balustrades, multiple levels or other architectural features, costs can jump significantly—some builds exceed $800 to $1,000/m² or more in extreme or highly customised cases.

Here are the key elements that drive the installation cost:

• Substructure and framing: Posts, bearers, joists, footings and supports are essential and can be pricey, especially for elevated decks or uneven terrain.

• Site preparation: Clearing, leveling, excavation, soil compaction and drainage works all add to labour and material costs.

• Access and logistics: Properties with challenging access (tight yards, slopes, limited entry) require more manual labour, which raises expenses.

• Finishing components: Stairs, handrails, balustrades, edges, and trims add complexity and costs.

• Compliance and permits: Elevated decks often require compliance with building codes, structural engineering, inspections and permits, which increase costs.

• Material handling and wastage: Cutting, offcuts, extra fixing hardware, and waste disposal are built into the project cost.

Because of all these variables, many installers prefer to quote per project rather than per square metre, especially when dealing with more complex designs.

Decking Installation Costs

The installation of a deck involves more than just laying boards. The bulk of the cost often comes from the structural work, including posts, bearers, joists and footings. For ground-level decks on a simple site, installation costs usually fall between $300 and $400 per square metre, depending on the material. Elevated decks, or those built on sloping blocks, can push costs much higher — often into the $800 to $1,000+ per square metre range due to the extra engineering, supports and compliance requirements.

Other factors that influence installation costs include access to the site, whether machinery can be used or if manual labour is required, and the inclusion of extras such as stairs, handrails or balustrades. Because each project is unique, many installers prefer to quote per project rather than strictly per square metre.

Hidden or Additional Costs

When budgeting for a new deck, it’s important to factor in costs beyond the main build. Council approvals and building permits may be required, particularly for elevated decks or those above a certain size. These come with application fees that vary by state and local government.

Site preparation can also add to the budget. Clearing old structures, levelling uneven ground, or adding drainage solutions can significantly increase labour hours and material use.

Other extras include finishes and treatments such as oils, stains or sealants to protect timber, along with lighting, integrated seating or planter boxes for a more customised look. Waste disposal and the cost of removing old decking are also easy to overlook but are commonly added to the final bill.

Benefits of Decking

Adding a deck offers both lifestyle and financial benefits. A well-designed deck extends your living space outdoors, creating the perfect spot for entertaining, relaxing or dining. It also enhances the overall aesthetic appeal of a property, blending seamlessly with gardens and landscapes.

From an investment perspective, decking can add value to your home, making it more attractive to potential buyers. In Australia’s climate, a deck is often seen as a must-have feature that increases a property’s usability year-round.

The choice of materials also means you can align your deck to your lifestyle. Timber decks provide a classic, natural look, while composite options offer a low-maintenance alternative that resists fading, warping and termites. Whichever you choose, a deck adds functionality, comfort and style to your home.

How to Save on Decking Costs

There are several ways to reduce the overall cost of your decking project. The first is to compare multiple quotes from local builders or carpenters. This not only helps you find a competitive price but also gives you the chance to compare workmanship and inclusions.

Choosing the right materials for your needs is also important. If you’re on a tighter budget, treated pine is more affordable than hardwoods. Composite decking may cost more upfront but can save money in the long run by reducing maintenance.

Design choices can also affect your budget. Opting for a simpler, ground-level deck rather than a raised or multi-level structure with stairs and balustrades can keep labour and material costs down.

Finally, you may be able to save by handling some preparation work yourself, such as clearing old decking or levelling small areas. Just be cautious not to take on work that requires technical skills or approvals — structural components should always be left to licensed professionals.

Finding the Right Decking Installer

The success and longevity of your deck depend heavily on the quality of installation. Even with premium materials, poor workmanship can lead to structural issues, uneven surfaces or problems with drainage. That’s why it’s essential to hire a professional who is experienced in building decks and understands local building codes and permit requirements.

When choosing an installer, always check that they are licensed and insured, and ask whether they provide warranties on both materials and workmanship. Reviewing references or past projects can also give you confidence in the quality of their work. Clear and itemised quotes are another must-have, so you know exactly what’s included and what might cost extra.

To make the process simpler, The Tradie List connects homeowners directly with trusted local decking installers. By visiting thetradielist.com, you can compare multiple quotes, check qualifications and find the right professional for your project quickly and with peace of mind.