Tech update: Acceptable Tolerances in Brickwork 

Traditional brick and block remains the most common construction method in new homes. Whilst a level of deviation in brickwork levels is inevitable such differences can affect the overall finish of the property. The below technical update summarises the LABC Warranty technical guidance on acceptable tolerances in brickwork.  


Max Deviation: Height

The diagram shows the max deviation that should be allowed in the construction of a brick wall.
As you can see, there should be a maximum deviation of 10mm in any length of wall up to five metres.

Levelness of mortar bed joints

For walls up to 5 metres long there should be no more than a maximum 10mm deviation. Though, a pro rata tolerance is applicable for walls less than 5m long. If the wall is over 5 metres long the maximum deviation should be no more than 15 mm. It’s also important to remember that there should be no recurrent variations in the level of the bed joint line.

Thickness of bed joints
The thickness of an individual bed joint should not vary from the average of any eight successive joints by more than 5mm.


For further information on Acceptable Tolerances in Brickwork you can download Chapter 1 of our Technical Manual:

The information used in this article is taken from Version 8 of the LABC Warranty technical Manual and is provided as guidance in meeting our technical standards. If working on an LABC Warranty site please check which standards apply.


Please Note: Every care was taken to ensure the information in this article was correct at the time of publication. Any written guidance provided does not replace the reader’s professional judgement and any construction project should comply with the relevant Building Regulations or applicable technical standards. However, for the most up to date LABC Warranty technical guidance please refer to your Risk Management Surveyor and the latest version of the LABC Warranty technical manual.


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