Standard Brick Sizes

Loft Conversions

A guide to standard brick sizes and bonds


When it comes to standard brick sizes, there are quite a few more variations than you may have initially thought. Not only do standard brick sizes vary from country to country, we also have different ways of building with bricks, special bricks, different brick bonds, different mortar options, and different ways of determining brick dimensions. We will take a closer look at all of these factors in the following post. 

Standard Brick Sizes




A standard UK brick size is 215mm long x 102.5mm wide x 65mm high according to British Standards. 


Standard UK Brick Size


The length of the brick is equal to twice its width plus one 10mm mortar joint, and three times its hight plus two standard mortar joints. 


To learn more about coordinating brick dimensions see our Brick Dimension Tables Explained Guide – with free pdf download. 




In case you are wondering, a standard US brick size is 8 inches long x 3 5/8 inches wide x 2 1/4 inches high. 


Standard US Brick Size




A standard Australian brick size is 230mm long x 110mm wide x 76mm high.


Standard AUS Brick Size


For the purpose of this post, however, we will be focusing on UK standards. 

Special Bricks


Special bricks are used to create different designs, shapes, features and detailing. There are a few British Standard special bricks that are widely available, these include:

  • Angles
  • Arches
  • Bonding
  • Bullnose
  • Plinth



Credit Forterra


It is also possible to get non standard bespoke bricks from different brick suppliers. 

Brick Bonds


Bricks can be laid in many different ways, creating a variety of patterns. 


The most popular brick bond patterns in the UK are:


  • Stretcher bond
  • Stack bond
  • English bond
  • Flemish bond
  • Header bond

Stretcher bond

Stack bond

English bond

Flemish bond

Header bond

Types of Brick Mortar


Mortar joints can be finished with different profiles. The purpose of the finishing joints is to ensure rain is deflected away from the joint, but also there is an aesthetic element to the joint design too. 


The most commonly used mortar joints in the UK are:


  • Recessed (not suited to exposed areas)
  • Weathered Struck
  • Bucket handle or curved recessed
  • Flush


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