Retaining walls are built in sloppy terrains or backyards generally to prevent soil erosion, improve landscaping and provide support. Its main function is to keep the soil stable while letting water pass through normally.
In a place with diverse terrain like Australia, retaining walls are quite popular. Their costs can range anywhere from $150 to $650, depending on the materials you choose, the wall’s size and location, complexity of the design, etc.
We have compiled a guide on type of materials, their price and how to estimate labour costs. Whether you’re planning on DIYing the wall at home or planning on hiring professionals, this knowledge will definitely help you make budget conscious decisions.
Cost by Material (Concrete, Stone, Timber, Brick)
Deciding the materials for a retaining wall is one of the key factors to take into account during design. Every material accentuates its own beauty; timber radiates rusticise; concrete is strong and lasting; stone and bricks provide naturality; etc. These materials vary in appearance and cost; therefore, if you want to make a smart long-term financial decision, you will have to consider lifetime and upkeep while selecting a material. Which then should you pick? Let's learn:
-
Concrete Blocks: They are widely available and relatively simple to install. They have a sleek and modern appearance. If superior strength, durability, and longevity are what you’re after, then concrete is an excellent choice. They have various styles, such as plain concrete and textured block finish. On average, they cost between $450 and $700 per square meter.
-
Timber: This is probably the more popular and cheap option when it comes to retaining walls. Popular materials used in timber retaining walls include treated pine, hardwood, and old railway sleepers, among others. For their natural and rustic look that fits nicely into most outdoor scenarios, they are usually priced around $250 to $350 per square meter.
-
Natural Stone: The top choices of natural stones include sandstone, granite, and limestone. Each has the unique appearance, elevation, and price. Depending on the type of stone, they carry an average price of $150-$250 per square meter.
-
Bricks: Brick retaining walls are great for DIY projects. They are easier to handle and install. The price is about $250 to $650 per square meter.
Labour and Excavation Costs
Labour costs can vary a lot depending on how complex the project is and how accessible the site is. A simple wall on flat, open land will cost less than one that needs heavy excavation or is hard to reach. Materials that require special skills or have intricate designs can also increase the price.
To help you get the rough estimation of costs, there are many free cost calculators available online. You just plug in details like the size of the wall, the materials you’re planning on using, and your location. You can find plenty of such helpful tools on websites like HomeAdvisor, Houzz, or local Aussie construction and landscaping sites.
Though the real expenses vary, these calculators can give you a broad estimate. Depending on the contractor, Australian labour rates range from $55 to $100 an hour, or roughly $137.50 to $250 per square metre. Moreover, if excavation is needed it can cost from $400 to $1500 depending on the complexity of the operation and the equipments used. See a professional for correct cost estimate.
DIY vs Professional Installation
The Pros and Cons of DIY
Pros
-
Cost Savings: DIY means no labour costs, which significantly reduces your project’s overall expense.
-
Personal Satisfaction: Provides you with an ability to customise every aspect according to your preference and have personal satisfaction and a sense of pride.
Cons
-
Time and Effort: You need to invest some major time and physical labour to DIY a retaining wall.
-
Risk of Mistakes: You’re more prone to make an error without professional experience.
When Should you Hire Professionals?
-
For walls exceeding a certain height (commonly around 4 feet (1.22 m)), engineering and permits might be required.
-
When the site or soil requires specialised knowledge or professional opinion.
-
If you’re not sure about your ability to complete the project
Professional installation has certain benefits, such as:
-
Faster Installation: Professionals are much faster as they have the experience and tools.
-
Access to Superior Materials: Contractors often get better deals on materials than us individually
-
Expertise: Ensures structural integrity and longevity.
