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Hi All, As seen in the pic, we have a row of cracked tiles which sit over the border of old kitchen floor and new extension. I am thinking that the extension floor, which is about 3 years old, has gradually settled and caused this row of tiles to crack over the threshold. I'm presuming that if I just replace the tiles, there is every likelihood they will just crack again. What is the best way to prevent this from happening please ?

If it was my house I would remove the full row of tiles and install decoupling membrane before re tiling. If possible can you get a silicone matched to the grout colour? You could silicone the joint running parallel to the crack so it acts as an expansion joint.

Thank you very much. I'll will look into this membrane. I appreciate your advice.