Residential elevators and lifts are important means of transportation of people from one floor of a building to another. If the buildings are huge with a lot of floors, they become a must because everyone like old age people and infants cannot climb gigantic stairs without any support.
So, residential lifts should be maintained properly. You should get the servicing of the lift done in two months or so from a reliable company as it is a mechanical device. Get it parts oiled and checked by a proper mechanic. Make sure the carrying capacity of the lift is not crossed as that may turn out to be bad for the lift.
The lightning of the elevator should also be kept in check regularly. Sign a contract of maintenance from a licensed supplier for customary services for the lift. Usually the maintenance of lifts is extremely expensive, so one must be ready to face it.