how tall are you
it may do, but might come up short on the occasional window, I just done the majority of my round with the clx 22 and it reached all the windows but only just on some, i.e, standing close to the building with the pole at full stretch above my head, with me getting soaked, so I bought the other section to make life easier with the 27, but I am only 5ft 6
by the way I am looking at the other answers and I am presuming by 3 storey you mean ground, first and second floor, no chance if you mean third floor as well