Products
Precast Concrete Blocks — LEGO, Flat Top, Half Blocks
Quality blocks at competitive prices. From $60+GST. Manufactured in-house, available for pickup or delivery across NSW.
Request a QuoteSymon Concrete Products supplies four precast concrete block types — LEGO, flat top, and half-size options — with upfront pricing from $60+GST. All blocks are manufactured in-house and include a 2.5-tonne lifting anchor point. Delivery is available NSW-wide, with optional offload and placement.
Our Current Range
Four block types, manufactured in-house. Upfront pricing, no surprises.
Precast Concrete LEGO Block
per block, ex-delivery · 2.5-tonne anchor point
Best for: Interlocking retaining walls, flexible site layouts, hoarding barriers, temporary construction barriers.
Precast Concrete Flat Top Block
per block, ex-delivery · 2.5-tonne anchor point
Best for: Material bays, simple stacking, non-interlocking applications, partitions where a flat top surface is preferred.
Precast Concrete LEGO Half Block
per block, ex-delivery · 2.5-tonne anchor point
Best for: Lower walls, corners, tighter spaces, material bays, end caps, gateways.
Precast Concrete Flat Top Half Block
per block, ex-delivery · 2.5-tonne anchor point
Best for: Lower walls, simple stacking, compact applications, planter boxes, low-height partitions.
What's Included in Block Pricing
Block prices are per unit (ex-delivery). Each block includes a 2.5-tonne lifting anchor point. Delivery and placement are quoted separately based on your location, order size, and site access.
Included in Block Price
- Block manufactured to spec
- 2.5-tonne lifting anchor point
- Pickup from Mount Kuring-Gai or Marsden Park
Quoted Separately
- Delivery (based on location, order size, truck type, site access)
- Install/placement (offload + positioning, quoted per hour)
Coming Soon — Register Your Interest
We're expanding our range with stone face finishes and residential-friendly 300mm blocks. These products are in development and will be available soon.
Register your interest: Email info@symonconcreteproducts.com.au or call (02) 8089 0265.
Stone Face LEGO Block
Best for: Premium retaining walls, landscaping features, decorative applications where a textured stone finish is desired.
Decorative stone-style textured finish on the visible face, maintaining the interlocking LEGO design for stability.
Stone Face Flat Top Block
Best for: Decorative garden walls, feature boundaries, upscale material bays, landscaping projects where aesthetics matter.
Premium stone-style finish with the clean stacking profile of a flat top block.
300mm LEGO Block (Residential)
Best for: Residential retaining walls, standard house blocks with width constraints, compact sites, backyard projects.
Narrower 300mm width (vs standard 600mm) makes it easier to fit on standard residential blocks and tighter spaces, while maintaining interlocking stability.
300mm Flat Top Block (Residential)
Best for: Residential garden walls, planter boxes, space-efficient projects, backyard retaining where width is limited.
Combines narrow 300mm profile with flat top design for clean, space-efficient residential applications.
Not Sure Which Block to Choose?
Use this guide to match your project to the right block type.
LEGO Blocks have interlocking lugs on top and recesses on the bottom. They lock together like LEGO, making them ideal for retaining walls that need to resist lateral pressure, or layouts that might need adjusting. Commonly used for site hoarding, temporary barriers, and retaining walls.
Flat Top Blocks have a smooth top and bottom. They stack cleanly but don't interlock. Best for material bays, simple partitions, or applications where you need a flat top surface.
Still deciding? If you're building a retaining wall on sloped ground or need stability against earth pressure, choose LEGO. If you're creating storage bays or partitions on flat ground, choose flat top.
Half Blocks (600mm length) give you flexibility for corners, ends, or tighter spaces. They're also lighter (half a tonne), so easier to handle if you're unloading manually or working in confined areas.
Full Blocks (1200mm length) cover more ground per unit — faster to lay, better for long walls or large bays.
Rule of thumb: Use full blocks for the main run of your wall or bay, and half blocks for corners, ends, or where space is tight.
LEGO blocks are the most popular for site hoarding and temporary fencing ballast. The interlocking design adds stability, and they're easily repositioned if site layout changes.
Flat top blocks are ideal for material bays (sand, gravel, mulch storage). The flat top makes loading and unloading easier, and you don't need interlocking for this application.
Call us on (02) 8089 0265 — we'll talk through your project and recommend the right option.
Common Uses for Precast Concrete Blocks
Precast concrete blocks are used across a wide range of industries and applications.
Site Hoarding & Temporary Fencing
LEGO blocks as ballast for construction site hoarding, barriers, and perimeters.
Retaining Walls
LEGO blocks for sloped terrain, erosion control, and permanent walls (residential, commercial, industrial).
Material Bays & Storage
Flat top blocks for clean partitions between stockpiles at quarries, landscaping yards, construction sites.
Marine & Mooring
Both types for boat ramp barriers, jetty ballast, waterfront structures (salt and water-resistant).
Farm & Rural
Property boundaries, livestock yards, erosion control. Half blocks popular for gateways and corners.
Civil Construction
Both types for roadworks barriers, levee construction, drainage support, temporary infrastructure.
Manufacturing & Safety Standards
All blocks are manufactured in-house at our facilities using:
Verdex moulds for precision and consistent dimensions
High-grade concrete designed for Australian conditions
2.5-tonne lifting anchor point built into every block for safe handling with standard clutch
Suitable for both permanent and temporary structures.
Product Questions
Common questions about our precast concrete blocks.
Block prices are per unit and include manufacturing and a 2.5-tonne lifting anchor point. Delivery and install/placement are quoted separately based on your location, order size, and site access.
Request a QuoteYes — delivery is available NSW-wide from our two NSW locations. Delivery cost depends on distance, order size, truck type, and site access, and is quoted upfront.
See Delivery DetailsYes. Our supply & install service includes offloading and placement to your instructions. Install is quoted per hour and excludes site preparation unless agreed.
See Supply & InstallCurrently we manufacture our standard four block types. We have stone face finishes and 300mm residential blocks in development. For custom requests, contact us to discuss options.
Call (02) 8089 0265Yes. Pickup is available from two locations: Mount Kuring-Gai (56 Beaumont Road, NSW 2080) and Marsden Park (223 Grange Avenue, NSW 2765). You'll need suitable lifting equipment (we include a 2.5-tonne lifting anchor on each block). Call ahead to confirm stock and timing.
Call (02) 8089 0265Typically 1.5–2 weeks depending on current stock. If you have an urgent project, let us know and we'll advise the soonest available slot.
Request a QuoteReady to Order or Need a Quote?
Tell us your block type, quantity, and delivery location — we'll get back to you with clear pricing.