French law. Tour d’echelle is a right which the owner of an estate has of placing ladders on his neighbor’s property to facilitate the reparation of a party wall, or of buildings which are supported by that wall. It is a species of servitude. Lois des Bat. part 1, c. 3, sect. 2, art. 9, Section 1. 2. In another sense by this term, or echellage, is understood the space of ground left unoccupied around a building for the purpose of enabling the owner to repair it with convenience; this is not a servitude, but an actual corporeal property.