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My new house was received in early April 2009. In April 2010, I see that the joint between the plinth and the floor tiles is in many places cracked. I wonder if it's normal. I do not have a floor slab or crawlspace, or floor heating.

Such a crack is of course not normal, especially if it is regular and runs the entire length of the tiles. Depending on the material used in the construction of the wall, it is possible that a strong vibration has moved their structure (especially if it is plasterboard). Your soil may also sag. Take the following test: Take a big mason's rule and check the flatness by placing a bubble level on it. Tap your skirting board and tile to make sure it does not ring hollow, which would be a sign of poor workmanship. Contact your contractor to determine the real causes of the problem and their solutions. Too bad you did not make this claim during the first year after receipt.

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Video Instruction: Home Repair: How to Replace Cracked Tile