How Much Does Timber Decking Cost?

2022 Timber Deck Price Guide

The Timber Deck Price Guide - How Much Do They Cost?

Is it time you added a quality timber deck to your property? It will surely increase the value of the property. Not to mention the added aesthetic appeal. In this article we will explore average prices you can expect to pay when building a timber deck. So without further adieu, how much does it really cost to build a timber deck?


Traditionally pricing is approximately $300-400 per square metre. The averages are as follows:

  • $10,000 for a 20m2 deck
  • Up to $15,000 for a 30m2 deck
  • Up to $20,000 for a 40m2 deck

Your price may vary considerably. Dependent upon the type of deck that you want, type of timber selected, and the complexity of the project the price may increase from these baseline norms.

Deck Types

Where you intend on putting your deck and the layout of the area will determine or narrow down the choices of decks. You may want to install a wrap around deck which is essentially a wraparound porch. If you have a large property you may opt for a two-story deck to utilize the most space that you can for the deck. You must also decide if you want it to be attached or detached. There is also the option of putting the deck on the top of your roof or over the garage.

Available Timbers

There are several different types of timbers that are available for decking. Some of the most popular timbers are treated pine, jarrah, blackbutt, and spotted gum to name a few. The type of deck that you want to install may impact the decision that you make about the type of wood that you use.

Does My Deck Builder Need to be Licensed?

Does My Deck Builder Need to be Licensed?

There are of course some legal things that must be taken into consideration when choosing someone to build your deck. When you are considering building a deck you must obtain a building permit. In order to get a building permit to be issued you must either build the deck yourself or hire a licensed deck builder. The short answer is that if you do not intend on building the deck yourself then you must hire a licensed deck builder.

  • In NSW Jobs over $1000 require a licensed builder
  • Victorian work over $5000 requires a registered Building Practitioner by the Vic Government
  • Queensland jobs over $3300 require a QBCC builders License
  • South Australia jobs must be done by a licensed supervisor or professional building contractor with insurance
  • Western Australia just requires a bbuilding permit issued by the Government.
  • Tasmania requires  a builder or construction manager to manage the project
  • ACT considers deck building a building trade.
  • Northern Territoty requires a building permit and detailed plans submitted to the council.

Do I need building or council approval for my deck?

When you are considering getting a new deck installed or having an existing one renovated you must consider if you will need to get building or council approval. You actually may not need council approval for a deck to be constructed on your property. You can complete this online inquiry in order to find out if you will or will not need council approval.

Building approval is a separate action than gaining approval from council. You will need to get building approval from a Queensland Building and Construction Commission licensed contractor which you can find here.

The Size and Shape of Your Deck

There are essentially two main factors that will influence the cost of your deck. These two are the type of timber that you choose to use and the size and shape of your deck.  You will need to determine what you will be using your deck for and from there discern what the best option is for you and your family.

Cost Breakdown by Timber Type

Cost Breakdown by Timber Type

Let’s get down to possibly the most influential aspect of this or any project, the costs associated with it. While the type, size, and shape will also play a part, the type of timber that is used will also make a great impact into the overall cost of the deck.

Hardwoods: Should you chose to use hardwoods then you can expect to pay more than a pine deck but less than a composite deck.

Treated Pine: Looking at a treated pine deck? This is the most cost-efficient type of deck to build so you may want to choose this if you have a larger deck to build or if you are on a tight budget.

Composite Deck: Not a timber at all the composite deck is the costliest option but is made to appear as one of the hardwood options.

Cost Breakdown by Square Metre

When you have an idea of the size of the deck that you are wanting to have built at your property a price by square metre does tend to come in handy. This information will allow you to make an informed decision when you choose someone to build your deck. While none of these are fixed prices, they are merely examples of a ballpark figure of what you can expect to pay.

For a hardwood deck you can expect to pay approximately $200 for a treated pine deck. This is by far the least cost prohibitive option. A Hardwood deck will cost anywhere in the neighborhood of $320 on up per square metre. It is a much more expensive option but will tend to do better in the Aussie climate. Finally, a composite deck will cost $380 plus per square metre. While one of the most expensive options, it also is the longest lasting of these three.

Average Deck Price Range – Deck Size

  • 10 square metres $3,600 – $5,500
  • 20 square metres $5500 – $10,000
  • 30 square metres $10,000 – $15,000
  • 40 square metres $15,000 – $20,000
  • 50 square metres $20,000 – $25,000
  • More than 50 square metres $25,000 – $30,000

The price will include:

  • All Building Materials and Labour
  • Digging holes for stumps
  • Installing steel or concrete stumps
  • Subfloor Installation, including joists and bearers
  • Installing the deck
  • Final Handover

How Much Does It Cost to Build a Composite Deck?

Depending on the complexity of the project the average cost of a composite deck install will set you back anywhere from $100-$350 per square metre. While this is a great disparity in pricing it is important to understand that there are several high-end composite deck manufactures and some that don’t make, well let’s say as good of a product. Depending on the size of the deck area as well as the complexity of the project, you should be able to get a good idea of what you can expect to spend.

Things That Will Affect the Cost of Your Deck

There are several things that can add to the average cost of your deck. Some things that may affect the cost are obvious, such as the size and shape of the deck. The larger and more ornate the deck is, the more you can expect to spend. If the elevation or slope of the deck is different in one area and needs to be adjusted, this can add quite a lot to the costs associated with the installation of the deck. If you plan on installing a deck on a garage or roof, there may be costs associated with reinforcing the areas. This is to support the weight of the deck and people as well.

Another point to consider is the upkeep of the deck. Not all deck maintenance is the same and this should be factored into the price as well. For example, a hardwood deck will need a timber oil or finish every year. This to maintain the look of the deck. A treated pine deck will also need to be oiled on an annual basis. On the another hand, a composite deck will spare you the requirement of annually treating your deck with oil. All you will need to do is get a good composite deck cleaner and clean it at the end of the year.


A deck can be one of the wisest investments that you can make as far as home improvement goes. It is a gift that you your family will enjoy for years to come. It is no wonder why they are so popular. By comparing prices you will be able to select the option the fits the needs of your family.  And have a beautiful deck for years to come.