Thinking about installing a sandstone retaining wall? Great choice. Sandstone looks beautiful, ages well, and brings lasting value to your outdoor space.
But before you start planning or hiring an installer, it’s important to understand the basics, which include the cost, site conditions, and approval requirements. This blog is a guide to help you make the right decisions.
Sandstone blends naturally with gardens, paving, and most architectural styles. Its warm, earthy tones create a finish that instantly elevates outdoor spaces.
When built correctly, a sandstone retaining wall can last for decades. The stone’s strength and weather resistance mean it requires very little maintenance over time.
Sandstone walls provide strong support for soil, help reduce erosion, and make it easier to transform uneven or sloping areas into usable, functional spaces.
A well-designed sandstone retaining wall adds charm, character, and visual interest. Combined with quality landscaping, it can significantly enhance your property’s overall value.
When you’re planning a sandstone retaining wall, the big question is always the price. In Australia, the cost in 2025 ranges between $300 and $600 per m².
Here’s a clearer breakdown.
Not all sandstone blocks cost the same.
The taller or longer the wall, the more:
Challenging soil increases excavation time, which raises the total cost.
Access makes a big difference. If machinery can reach the site easily, the job moves faster, and labour costs stay low. But if your installer needs smaller equipment or has to hand-place the blocks, the build slows down, and the overall cost increases.
A sandstone retaining wall is a long-term investment, so proper planning helps you avoid unnecessary costs, delays, and issues.
Is the area flat, sloped, or uneven? Sandstone retaining walls are ideal for sloping blocks, but steep sites need precise measurements, cut-and-fill work, and machinery access planning.
Clay, sandy, and reactive soils behave very differently, especially when wet. Soil type affects footing requirements, drainage design, and stability, so it’s important to get this right from the start.
Large trees and older garden beds can affect drainage and the strength of your retaining wall. If you cut large roots, it can harm the tree and make the wall less stable, so keep this in mind when planning.
The reason you’re building the wall determines how high it needs to be and what rules apply.
Suitable for garden edging and minor level changes. This is simpler to build.
Now considered structural, you need engineering input or approvals depending on location and soil conditions.
Requires a formal engineering design and council approval in NSW. These walls retain significant soil and must meet strict safety standards.
It’s important to define the purpose first, and the required height will follow.
Proper drainage is crucial. Most retaining wall failures happen because water builds up behind the wall. Your drainage design should include:
Also consider how water will move across your property. Redirecting stormwater onto a neighbour’s land can breach council regulations and cause disputes.
If you’re in NSW, you must check local regulations before starting. Retaining walls are regulated under NSW planning legislation, and the requirements depend on height, location, and soil conditions.
Council approval is not required if the wall:
If your project meets all of these conditions, you are able to build without formal approval, but it’s still best to confirm with your local council or a qualified contractor.
To make everything easier to plan, here’s a simple checklist that brings together the key points from the previous section, plus a few extra essentials you should consider before building your sandstone retaining wall:
Following these steps will ensure your sandstone retaining wall is not only beautiful but also strong, durable, and compliant, giving you peace of mind for years to come.
Sandstone retaining walls are hard to beat when it comes to adding value to your property. A retaining wall is more than just holding back soil, it’s about shaping your land and building a lasting, visually appealing feature.
So, if you’re thinking about building a sandstone retaining wall, take your time. Measure carefully, talk to a trusted retaining wall installer, ask about compliance and drainage, and treat it like the investment it is.
To make sure your sandstone retaining wall is built right, contact Buildaroo now at 0421 841 919 or through our online form to discuss your project.
