Whatever ladder you choose to do your granny flat maintenance, make sure it is of quality and the right size. You should always think about these things when using a ladder. If you are working on electrical circuits, then avoid using a conductive ladder such as aluminum. You could be electrocuted as long as your ladder is metal and is touching the earth. Wood or composite ladders are nonconductive so use these instead. You also need to consider the load rate for the ladder so you know if it can hold your weight. Most of this is printed on the ladder for your convenience.