Retaining walls do heaps of heavy lifting—literally. Whether landscaping or carving out a new section of your property, a good retaining wall should balance form and function. It must be sturdy enough to hold soil in place while looking attractive enough to complement the surrounding features.
The material you choose plays a major role in achieving that balance. Retaining wall materials range from timber to concrete, brick, and stone, so picking the right option for your needs and budget can feel overwhelming.
To help you decide, we’ve compiled a guide on popular materials for retaining walls. From versatile timber to the timeless appeal of stone, here are the top materials to consider (and why timber is often an excellent choice).
Timber: The Most Versatile Choice
Timber has three standout qualities:
- Durable
- Looks naturally beautiful
- Cost-effective (depending on the type you choose)
Timber is often the top choice for retaining wall materials because it works well in almost any application.
Timber retaining walls are particularly popular in residential landscaping projects. They offer a classic, rustic look that blends beautifully with gardens and outdoor spaces. Plus, timber walls are relatively easy to install with the right building supplies, making them a go-to for DIYers who want to enhance their property’s landscaping. Another benefit is that timber ages gracefully, developing a patina that adds to its charm over time.
Consider using treated posts and formply (durable, moisture-resistant plywood) for added strength and stability in your timber retaining wall. Formply is often used where a smooth, resilient surface is required, and it helps reinforce the wall against weathering. The installation process remains DIY-friendly but remember that timber posts should be installed at a slight incline to improve their load-bearing capacity.
Proper installation and basic maintenance—like a gentle wash and occasional re-oiling—can make a timber retaining wall last up to 20 years without breaking the bank. This durability and affordability make timber a popular choice for DIYers and professionals.
Concrete: Strong and Long-Lasting
Concrete is one of the strongest materials for retaining walls. It is ideal for commercial or large-scale projects where walls must hold significant soil loads back. Its durability makes concrete easy to withstand heavy pressure and requires minimal maintenance. However, concrete’s industrial look isn’t always the best fit for residential landscaping.
A concrete retaining wall generally costs more than a timber one and should be installed by a professional to ensure structural integrity. Improper installation can lead to issues like sagging or even wall failure, as the weight of concrete requires precise placement and support.
Stone: The Natural Aesthetic
Stone retaining walls offer an elegant and timeless look. Each wall is unique due to the natural variation in stone texture and colour. Stone is naturally suited for outdoor environments, as it resists weathering and pests. This combination of beauty and durability makes stone popular for high-end landscaping.
However, stone comes with a higher price tag. It’s generally more expensive and harder to source than other materials, such as timber. Since it’s a specialty material, it’s also important to order the full amount needed for your project in one go, as it can be difficult to match additional stones later if you run short.
Stone might be the perfect choice if you’re after a high-end, natural look and are willing to invest in professional installation.
Choosing the Right Material for Your Project
There are many materials to consider for retaining walls, but only one will fit your project. Take your time to explore your options. Timber is often the most practical and cost-effective choice if you’re planning a DIY project. But if you’re unsure, the team at Woodmart is here to help.
Explore the Woodmart Range for Quality Retaining Wall Materials
Woodmart offers everything you need to build a sturdy, long-lasting retaining wall, from retaining wall timber posts to high-quality sleepers. All our products meet or exceed New Zealand Building Code requirements (NZS3605), ensuring compliance at every step.
Browse our range today or speak to one of our friendly team members to find the perfect timber for your retaining wall project.
