Feature & Retaining Rock
Sandstone Boulders Sydney
Boulders do the landscaping work machines and mortar can’t fake: mass, permanence and the sense that the garden grew around the stone. Our sandstone boulders come straight off the Glenorie quarry in every size — from 75–150mm gabion spalls through 1–2 man rocks and bobcat rock to large feature boulders — in the full Sydney colour range.
For walling on a budget, select boulders are the smart grade: more shaped than regular boulders for easier, tighter placement, but more economical than excavator-sawn blocks.
Grades and Sizes
Regular boulders are fully natural — the go-to for bushland gardens, creek beds, feature rocks and informal retaining. "1–2 man" rocks (liftable by one or two people) suit hand-built edges and garden features; bobcat rock is the machine-placed middle class; and large feature boulders anchor entries and pool landscapes.
Select boulders are chosen and shaped for structured walling — flatter beds and faces that stack tighter, making them the perfect option for large-scale walls on a budget. And at the small end, gabion spalls (75–150mm) fill wire baskets, dry creek beds and drainage zones.
Boulder Walls and Placement
A boulder retaining wall is a gravity structure: big stones, battered back into the slope, each bearing on the ones below. Excavator placement with a rock grab is standard; expect roughly 1.5–2 tonnes of boulder per square metre of wall face depending on size class. Boulder walls want more horizontal room than block walls, and they repay it with the most natural finish retaining can have.
For feature placement, odd numbers read best — a three-boulder group with varied sizes, buried a third deep so they sit in the land rather than on it.
Current Stock
Boulder Range
| Grade | Size Class | Placement | Best For |
|---|---|---|---|
| Gabion Spalls | 75–150mm | By hand | Gabion baskets, creek beds, drainage |
| 1–2 Man Boulders | Hand / two-person | By hand or machine | Edging, features, informal walls |
| Bobcat Rock | Machine class | Bobcat / mini-excavator | Retaining, larger features |
| Select Boulders | Machine class, shaped | Excavator | Structured walls on a budget |
| Large Feature Boulders | Excavator class | Excavator / crane | Entry statements, pool landscapes |
Sold by the tonne or per rock, quarry direct from Glenorie NSW. Tell us your machine and access for the right size class.
Applications
Where This Stone Works
Free Quotes, Sydney-Wide Delivery
Send us your measurements and we'll calculate quantities, confirm current stock and quote delivery to your suburb — usually the same business day. Or visit the quarry to see the stone in person before you order.
Get a Free QuoteFAQ
Frequently Asked Questions
How much do sandstone boulders cost in Sydney?
Boulders are sold by the tonne or per rock depending on grade, quoted with delivery. Select boulders offer the best walling value; feature rocks are priced on size and character. Send your project details for a free quote.
What size sandstone boulder do I need?
For hand-placed edges and features, 1–2 man rocks; for retaining and bigger features, bobcat rock or select boulders placed by machine; for entry statements, large feature boulders. We’ll match size class to your machinery and design.
What are select sandstone boulders?
Boulders chosen and shaped for structured walling — flatter beds that stack tighter and faster than random rock, at a price well under sawn blocks. The best option for large-scale boulder walls on a budget.
How many tonnes of boulders for a retaining wall?
Roughly 1.5–2 tonnes per square metre of wall face, depending on boulder size and how tightly they stack. Send wall length and height and we’ll calculate tonnage in your quote.
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