My gardens are on 4 levels with house being on level 2. The house behind me is built on land at a higher level, the land being held back by retaining wall on my side which is approx 6 ft high. New owner has decided to extend his detached garage within about a foot of this wall and put in clear glass window overlooking my property. Although not yet complete, it is nearing 2 storeys height from my side. PD allows to be no more than 2.5 mars high but doesn’t appear to take into account the level above adjoining properties. Local planning are supposed to be monitoring the works but does anyone know what rights I have?