Is the property not allowed to lay floor tiles in the yard?

Allow. The yard is your own place, and the property has no jurisdiction. There is no law that you can't stick tiles in your yard, as long as it doesn't affect the appearance of the building. The difference between this technology and dry paving is that the dry cement mortar with the ratio of 1: 3 is replaced by ordinary water and cement mortar, and the tile floor with wet paving may produce empty drums and bubbles, which will affect the service life of the tile.