Assessing Cracks

A good rule of thumb is: If you see cracks wider than 3mm, stepped cracks in brickwork, or cracks that are getting bigger – It's probably best to contact a local RICS Building Surveyor (formerly known as a Chartered Surveyor).

✅ Call a RICS Building Surveyor if you're unsure about the cause of the cracks.

✅ Call a Structural Engineer if the surveyor suspects structural movement, subsidence, or foundation issues. This is particularly important before putting your home on the market, as buyers' surveyors will often recommend further investigations if significant cracks are present, potentially causing delays and additional costs during the sale process.


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Self Diagnosing Cracks
For internal and external cracks, the type of professional you should call depends on the severity of the cracking:

Hairline cracks - (less than 2-3mm) – Usually cosmetic. A general builder or decorator can often advise and repair, the good news most builders don't charge to come round and have a look.


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Cracks wider than 3mm, stepped cracks in brickwork, or cracks that are getting bigger – Contact a RICS Building Surveyor (formerly known as a Chartered Surveyor). They can assess whether the cracks are likely to be cosmetic or indicate structural movement.


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Significant structural concerns such as:

  • Diagonal cracks wider than 5mm
  • Cracks that run through bricks rather than mortar joints
  • Doors and windows sticking
  • Sloping floors
  • Gaps between walls and ceilings
  • Signs of subsidence

In these cases, a Structural Engineer should be instructed, as they can diagnose the cause of the movement and recommend repairs.


Quick Links to Local People Who Can Help. 

Choosing the Right Option. 
Your local How To Sell A House guide knows all the best options locally so if you get a little stuck give them a call.

Fox Property Consultants

Fox Property Consultants

Bournemouth, Dorset
Avon Surveys

Avon Surveys

Bournemouth, Dorset