Trench Block 440mm x 215mm x 300mm
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Product Details
A Trench Block 440mm x 215mm x 300mm is a large, high-strength concrete block designed for building the foundations of walls, especially where speed and stability are important. Its extra width allows you to lay fewer blocks per metre compared to standard blocks, making it ideal for constructing solid foundations quickly and reducing labour. These blocks are commonly used for supporting cavity walls, extensions, and new builds, particularly in groundworks where a strong, stable base is needed. The term “7.3N” refers to its compressive strength, meaning it can withstand heavy loads, while “cavity” or “foundation” indicates use below ground level or for supporting structural walls. Choose this block when you need a robust, wide foundation in areas with heavy loads or where building regulations require a solid base.
As of August 2026, PriceNailer data confirms that the cheapest price for Trench Block 440mm x 215mm x 300mm is £7.57 from BuildingMaterials.co.uk across 4 suppliers. Prices have increased by 7.5% over the last 8 months.
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Frequently Asked Questions
How many 440mm x 215mm x 300mm trench blocks do I need per metre?
You'll need approximately 2.3 blocks per linear metre when laying these 440mm wide trench blocks. The exact number depends on your mortar joint thickness, but this gives you a good estimate for ordering materials.
What is the compressive strength of 440mm x 215mm x 300mm trench blocks?
These trench blocks typically have a compressive strength of 7.3N/mm² or higher, making them suitable for load-bearing foundation work. Always check the manufacturer's specifications to ensure they meet your structural requirements and building regulations.
Can I use 440mm trench blocks above ground level?
While primarily designed for below-ground foundation work, these blocks can be used above ground level in certain applications. However, you should consult your structural engineer and local building control to ensure compliance with building regulations for your specific project.
What's the difference between 440mm trench blocks and standard concrete blocks?
The main difference is width - at 440mm, trench blocks are much wider than standard 100mm blocks, allowing faster construction with fewer blocks needed per metre. They're specifically designed for foundation work and have higher compressive strength than many standard blocks.
Do I need special tools to lay 440mm x 215mm x 300mm trench blocks?
Due to their size and weight (approximately 28-32kg each), you'll need mechanical lifting equipment or at least two people to handle them safely. Standard bricklaying tools like trowels and spirit levels are sufficient for the actual laying process.