Lease Extension Form is used when you want to extend the rent term of your rental agreement. You rent a house and live in it for about one or two years. You feel comfortable living here and do not want to move to a new house. Then you can communicate with the landlord about extending the agreement term. If he agrees, you both should sign the lease extension form.
Lease Amendment Form can be seen as a make-up of a rental agreement. When the landlord or the tenant want to make some changes to the lease agreement, a lease amendment is necessary to make. The changes can be written in the amendment include: to cut down some items, to add some items, or to make some changes to some items, etc. The amendment should be kept with the original lease agreement and other lease amendments.