Abstract1. The surveys required for registration of title for flats and maisonettes and parts of buildings in England follow the same general principles as those on which registration of ordinary land is based. That is to say, sufficiently accurate plans are required to identify and locate the property being registered, and to define its limits closely enough to identify the physical boundaries concerned without actually saying where the theoretical boundaries (or lines or planes) lie in relation to them. In other words, the principle of“general boundaries”is applied in this case also as in registration of land.