When planning an extension, wall renovation, or new property build, choosing the right facing brick is arguably the single most important aesthetic decision you will make. Facing bricks create the visible exterior "skin" of your home, defining its curb appeal, architectural character, and overall property value.
However, beyond selecting the perfect colour or texture, getting the brick height right—specifically choosing between 65mm facing bricks and 73mm facing bricks—is the boundary between a flawless, professional build and a mismatched architectural eyesore.
In this comprehensive guide, we unpack the technical differences between 65mm and 73mm facing bricks, how to measure your existing brickwork accurately, and how to source the best materials for your project from our full Facing Bricks Range at DBM DIY.
What Are Facing Bricks?
Unlike structural blocks or engineering bricks that prioritize extreme load-bearing strength or low water absorption below damp-proof course (DPC) level, facing bricks are specifically engineered for visible external walls. They blend weather resistance and frost protection (F2 rated) with visual beauty, available in a vast selection of wirecut, stock, pressed, and handmade finishes.
Whether you are matching a classic 1930s semi-detached house or specifying units for a modern architectural build, understanding brick dimensions is your vital first step.
65mm Facing Bricks: The Modern Metric Standard
The 65mm facing brick is the standard size used across the vast majority of UK residential construction today.
Key Technical Specs:
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Dimensions: 215mm (Length) x 102.5mm (Width) x 65mm (Height)
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Standard Mortar Joint: 10mm
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Coordinating Size: 225mm x 102.5mm x 75mm (including mortar)
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Coverage: Approximately 60 bricks per square metre ($\text{m}^2$)
Why Choose 65mm Bricks?
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Seamless Integration for Modern Builds: If your existing home was constructed post-1965, it almost certainly utilizes 65mm standard metric units. Using 65mm bricks ensures your extension aligns cleanly with original mortar courses.
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Modular Precision: Because four courses of 65mm bricks plus 10mm mortar joints equal exactly 300mm in height, bricklayers can lay courses quickly and accurately with minimal cutting.
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Versatile Styles & Finishes: Standard 65mm bricks are manufactured in the broadest selection of shades—from vibrant Cheshire Reds and London Yellow Buffs to sleek contemporary Anthracite Greys.
Explore our expansive inventory of standard metric units in the 65mm Bricks Collection.
73mm Facing Bricks: The Heritage & Restoration Choice
Often referred to as Imperial or Northern size bricks, 73mm facing bricks were the standard across many regions of the UK prior to metrication in the mid-1960s—particularly across the Midlands, North of England, and Scotland.
Key Technical Specs:
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Dimensions: 215mm (Length) x 102.5mm (Width) x 73mm (Height) (approx. 2 ⅞ inches high)
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Imperial Coursing Rule: 4 courses of 73mm bricks + 4 mortar joints = exactly 12 inches (304mm)
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Coverage: Approximately 57–60 bricks per square metre depending on joint size
Why Choose 73mm Bricks?
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Matching Period Properties: Trying to lay modern 65mm bricks against a Victorian, Edwardian, or pre-war wall causes cumulative coursing drift. By the 10th row, mortar joints fail to align, creating unsightly step downs. A 73mm brick solves this by matching the higher imperial coursing line.
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Authentic Restoration Work: When replacing damaged or "blown" brickwork, bricking up old doorway openings, or building a sympathetic garden wall, 73mm bricks replicate the substantial, rustic appearance of historic masonry.
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Enhanced Visual Presence: The slightly taller face height gives walls a robust, sturdy aesthetic often favoured for heavy boundary walls and traditional outbuildings.
Find the perfect match for older properties in our specialized 73mm Bricks Collection.
Quick Comparison: 65mm vs 73mm Facing Bricks
| Feature / Metric | 65mm Facing Bricks | 73mm Facing Bricks |
| Standard Type | Modern UK Metric Standard | Traditional Imperial / Heritage Size |
| Height | 65 mm | 73 mm (approx. 2 ⅞") |
| 4-Course Height | 300 mm (with mortar) | 304 mm / 12 inches (with mortar) |
| Best Used For | New builds, post-1960s extensions, modern garden structures | Restoration of pre-1960s homes, period extensions, boundary walls |
| Available Finishes | Smooth Wirecut, Sandfaced, Pressed, Rustic Multi | Reclaimed-look, Weathered Buff, Handmade Rustic, Deep Red Multi |
How to Measure Your Property to Match Bricks Accurately
Before ordering your materials, perform this simple 2-step measurement check on your current brickwork:
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Measure Single Brick Height: Pick a clean brick on your existing wall (excluding mortar).
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If it measures ~65mm (2.5 inches), order from the 65mm range.
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If it measures ~73mm (2.87 inches / 2 ⅞"), you need 73mm imperial bricks.
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Gauge the 4-Course Height: Measure from the bottom of one brick joint to the bottom of the joint 4 courses above:
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300mm indicates 65mm metric bricks.
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304mm (12 inches) confirms 73mm imperial bricks.
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Complementary Materials for Your Masonry Build
Achieving a durable, long-lasting masonry structure requires high-grade supporting supplies alongside your facing bricks. At DBM DIY, we supply the full scope of structural and finishing Building Materials:
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Mortar & Plasticisers: Standard general-purpose cement and plasticisers formulated for smooth workability.
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Engineering Bricks: For below-DPC foundations or retaining walls needing extreme water resistance, pair your facing bricks with high-strength Class B or Blue Engineering units.
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Special Offer & Clearance Deals: Working on a tight budget? Check out our discounted pallet deals in the Special Offer Bricks section.
Explore our full catalog across all categories directly in the main DBM DIY Brick Collection to compare options or request expert advice on brick matching.