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Uneven floors

Hi there, we have just purchased a 1930s bungalow and had a full building report showing there are no issues with the foundations. Now that we are about to move in, we notice that some of the floor portions are uneven. For example under the tiles in the front entrance and bathroom, the floor is raised unevenly. Would someone be available to have a look and give an indication of cost to fix? Is this common for such an old house? It was moved and repiled in 2009. Cheers