My doorframe is the same size, a few centimeters taller than before. Is it reasonable for the property not to refund the decoration deposit?

There is no basis for collecting the decoration deposit. Failure to return the deposit has constituted an illegal charge for infringement damage.

If a realty service enterprise violates the stipulations of the realty service contract or the provisions of laws, regulations and departmental rules and regulations, without authorization, expands the charging scope, raises the charging standard or charges repeatedly, and the owner raises a defense on the grounds of illegal charging, the people's court shall support it.