Stack without mortar
Lugs and recesses lock blocks together — no wet trades.
Modular site solutions
Interlocking Concrete Blocks
Heavy-duty interlocking blocks for retaining walls, bays and barriers.
Trusted by contractors, councils & developers
Interlocking concrete blocks — often called Lego blocks — stack without mortar to form retaining walls, storage bays, push walls and temporary barriers. They are strong, reusable and quick to install.
Retaining walls & bays
Build aggregate bays, push walls and retaining structures fast.
Reusable & relocatable
Unstack and move them as the site changes.
Fast to install
Walls go up in hours, not days.
Interlocking Concrete Blocks at a glance
- Also called
- Lego blocks, interlocking blocks, stacking blocks, barrier blocks
- How they join
- Cast lugs and recesses lock block to block — no mortar and no wet trades
- Sizes
- Several sizes are available — confirm current stock and dimensions when you enquire
- Handling
- Placed by machine; blocks are heavy and are not a manual-handling item
- Typical uses
- Retaining walls, aggregate storage bays, push walls, site barriers and separation
- Reusable
- Unstack and relocate as the site changes — they are an asset, not a consumable
Where interlocking concrete blocks earns its place
Aggregate and material storage bays
Dividing a yard into bays for different materials. Push walls take the loading-shovel impact that a blockwork wall would not survive.
Retaining walls
Level changes and stockpile retention. Anything load-bearing or over modest height needs engineering input on the design and the base.
Temporary site separation
Segregating plant routes from pedestrians, or securing a compound, on a site whose layout will change again in three months.
What interlocking concrete blocks costs
Blocks are bought or hired per block, and the economics turn on whether you get them back.
- No mortar, no wet trades and no curing time — the labour cost is machine time, not bricklaying.
- A wall goes up in hours, so the programme cost is a fraction of a built wall.
- They are reusable, so the cost spreads across every future site you move them to.
- Delivery and offload require suitable machine access — worth confirming before you order.
Tell us the wall length, the height and whether it is retaining or free-standing, and we will confirm block sizes, quantity and price. Call 0800 001 6147.
Where we deliver
Interlocking Concrete Blocks across Yorkshire and the North West
We run interlocking concrete blocks out of three depots. If your site is inside these postcode areas, ring us and we will tell you which depot is closest and roughly how long it takes to reach you.
Get a volumetric concrete price in 30 minutes
- BS EN 206 Compliant
- Same-Day Available
Questions
Interlocking Concrete Blocks — your questions answered
The things customers ask us most about interlocking concrete blocks.
What are interlocking concrete blocks?
Large precast concrete blocks with cast lugs on top and matching recesses underneath, so they key into each other when stacked — the reason they are widely called Lego blocks. They build retaining walls, storage bays, push walls and barriers without mortar, and can be unstacked and moved when the site changes.
Do interlocking blocks need mortar or a foundation?
No mortar — the interlock and the weight do the work. They do need a firm, level base: a compacted stone base at minimum, and for a retaining wall or anything of height a properly designed foundation. A block wall is only as stable as what it stands on.
How high can you stack interlocking concrete blocks?
That depends on the block size, whether the wall is retaining or free-standing, and what is behind it. Anything retaining material, or above modest height, should be designed — surcharge from stored material or plant working against the wall changes the loading completely. We will not guess a safe height for you; get it engineered.
What are push walls used for?
Push walls take the direct impact of a loading shovel pushing material against them, typically in aggregate, waste and recycling yards. Interlocking blocks suit this because the mass resists the push and individual damaged blocks can be swapped out rather than rebuilding a wall.
Can interlocking blocks be moved and reused?
Yes — that is one of the main reasons they get specified. Unstack them with a machine and rebuild elsewhere. For sites whose layout changes, that makes them an asset that moves with you rather than a wall you demolish.
Go deeper on interlocking concrete blocks
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