Retaining & Terracing
Sandstone Retaining Wall Blocks Sydney
Sydney’s sloping blocks were made for sandstone retaining walls — the same stone the city sits on, holding back its gardens. We supply every scale of retaining stone direct from the Glenorie quarry: split logs and rough squared blocks for garden terracing, rockfaced and hydrasplit blocks for formal walls, and select boulders and large blocks for structural work.
Matching your wall height, access and budget to the right block is most of the battle, so here’s the range laid out the way a wall builder thinks about it.
Matching Block to Wall
For garden walls to around one metre, split logs (~300x300mm, sawn top and bottom for stable coursing, rough natural face) are the fastest build — small machinery is enough, and each course is one log high. Rough squared blocks build the classic drystone look, palletised at 4m² per pallet or loose by the tonne so you can hand-select at the quarry.
For formal, mortared retaining faces, rockfaced or hydrasplit blocks at 110mm bedwidth build as a veneer on an engineered core. And where the wall gets serious — over a metre, driveway surcharge, cut-and-fill batters — large rough squared blocks (2–3 man size) and select boulders provide the mass, placed by machine.
Heights, Engineering and Drainage
In NSW, retaining walls over 600mm generally need council approval and walls over about a metre need engineering — check your council’s specifics before building. Whatever the height, build in drainage: an aggregate-filled zone behind the wall with a slotted agricultural pipe falling to a legal discharge point, and free-draining backfill. Our crushed sandstone (75mm minus) makes excellent free-draining backfill from the same quarry.
Sandstone’s mass is the quiet advantage — a gravity wall of interlocked stone drains naturally through its joints, ages gracefully, and never rusts, rots or spalls like steel, timber or concrete alternatives.
Quantities: How Much Stone Do I Need?
Face area is height × length. Rough squared block pallets cover 4m² of wall face each; split logs at ~300mm high need one log-length per 0.3m of height. Loose blocks run roughly 1.5–2 tonnes per cubic metre of wall depending on packing. Send us your wall dimensions and we’ll take care of the arithmetic in a free quote.
Current Stock
Retaining Wall Stone Options
| Product | Scale | Install Method | Price Guide |
|---|---|---|---|
| Split Logs | ~300x300mm, to ~1m walls | Small machinery, coursed | Quote |
| Rough Squared Blocks (pallets) | Garden walls | Hand-laid, 4m²/pallet | From $120/m² |
| Rough Squared Blocks (loose) | Garden & rustic walls | Hand-laid, by the tonne | Quote / tonne |
| Rockfaced / Hydrasplit Blocks | Formal wall faces | Mortared veneer, 110mm bed | From $180/m² |
| Large Rough Squared Blocks | Structural walls, 2–3 man | Machine placed | Quote / tonne |
| Select Boulders | Large-scale walls on a budget | Excavator placed | Quote |
| Crushed Sandstone (backfill) | 75mm minus | Drainage backfill | Quote |
Walls over 600mm typically need council approval in NSW; over ~1m, engage an engineer. We supply to owner-builders, landscapers and civil contractors.
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
What are the best blocks for a sandstone retaining wall?
For walls up to about 1m, split logs and rough squared blocks are the most economical and easiest to build. For formal faces use rockfaced or hydrasplit blocks, and for structural walls use large rough squared blocks or select boulders placed by machine.
How high can I build a sandstone retaining wall without engineering?
Most NSW councils allow up to 600mm without approval; above that you generally need consent, and above about a metre an engineer’s design. Requirements vary by council — check locally before you build.
Do sandstone retaining walls need drainage?
Yes — every retaining wall needs a drainage zone behind it: aggregate or free-draining crushed sandstone, a slotted ag-pipe at the base falling to discharge, and weep paths through the face. Dry-stacked sandstone also drains naturally through its joints.
How many tonnes of sandstone blocks per square metre of wall?
As a rule of thumb, loose rough squared blocks build roughly 0.5–0.7m² of wall face per tonne depending on wall thickness and packing. Palletised blocks are simpler: each pallet covers 4m² of face. Send dimensions for an exact quote.
Sandstone vs timber sleepers for retaining walls?
Sandstone costs more upfront but never rots, warps or gets eaten by termites — treated pine walls typically last 15–20 years, sandstone lasts generations. Stone also drains through its joints and looks better with age.
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