When you are managing a commercial build, a residential basement, or a heavy-duty retaining wall, your structural masonry is the backbone of the entire project. As a builder, you know that delays in block supply or ordering the wrong specification can cause a domino effect, leaving your blocklayers waiting and blowing out your project timeline.

At BuildMart Australia, based right here in Melbourne, we understand that structural landscaping and bricklaying demand reliability. That is why we maintain a massive local stock of commercial-grade structural grey blocks (often referred to as Besser blocks).

Whether you need a single pallet to finish a job or multiple truckloads for a commercial basement, here is exactly how to specify the right block size for your next project.

1. The 90mm Grey Block: Space-Saving Structural Skin

Best for: Non-load-bearing partitions, external veneer walls, and tight-space fire-rated party walls. Why it matters: When site footprint is limited, the 90mm block provides excellent acoustic and fire-rating properties without eating into your valuable floor space. It’s the go-to choice for multi-residential boundary walls where every millimeter counts.
🔗 [link to: https://buildmart.com.au/product/grey-block-90mm/]

2. The 140mm Grey Block: The Versatile Mid-Weight

Best for: Low retaining walls, single-storey structural walls, and reinforced garden edging. Why it matters: The 140mm block hits the sweet spot between structural integrity and manageable weight. It is ideal for residential landscapers building stepped garden beds or builders constructing load-bearing walls where a standard 190mm block is overkill.
🔗 [link to: https://buildmart.com.au/product/grey-block-140/]

3. The 190mm Besser Block: The Industry Standard

Best for: Standard retaining walls, basement construction, core-filled structural pillars, and elevator shafts.

Why it matters: This is the undisputed workhorse of the Australian construction industry (Standard Code: 20.421). The 190mm block is designed to be fully reinforced with steel rebar and core-filled with concrete. If your engineer specifies a heavy-duty load-bearing wall, this is the exact block you need on-site.

💡 BuildMart Trade Tip: The “Mix Pallet” Advantage We know that estimating exact quantities for corners and wall ends can be a headache, and buying separate pallets for standard blocks, Notch Blocks, and End Blocks is a waste of your budget.

That’s why BuildMart supplies the 190mm Besser Block in convenient Mix Pallets. A standard mix pallet typically includes around 18 to 20 End Blocks right out of the gate. This means your blocklayers have the clean, flat ends they need to finish corners and window reveals seamlessly—without you having to place separate, costly orders for specialty blocks!

🔗 [link to: https://buildmart.com.au/product/besser-block/]

4. The 290mm Grey Block: Heavy-Duty Infrastructure

Best for: Major commercial retaining walls, heavy civil projects, and extreme load-bearing applications. Why it matters: When you are holding back tonnes of earth or building commercial-scale infrastructure, you need maximum width for maximum core-fill volume. The 290mm block provides unparalleled shear strength once filled, designed specifically for heavy engineering requirements.
🔗 [link to: https://buildmart.com.au/product/grey-block-290mm/]

Why Melbourne Builders Trust BuildMart Australia for Bulk Block Orders

We don’t just sell blocks; we partner with trades to keep your site moving.

• Massive Local Stock: We hold commercial quantities in our Glen Waverley yard. No more waiting weeks for factory runs.

• Direct-to-Site Delivery: Need 20 pallets dropped directly onto your site? Our logistics network handles heavy rigid and forklift deliveries across Melbourne.

• Consistent Quality: We source only premium, dimensionally accurate blocks to ensure your blocklayers can work fast and keep their lines perfectly straight.

• Trade Pricing: We offer highly competitive bulk pricing designed to protect your project margins.

Don’t let supply chain issues hold up your build. Ready to order? Browse our full range of structural blocks online or contact our trade team today for a live quote on bulk orders and site delivery.