It is not planning permission
The Party Wall process does not grant or replace planning permission and is not the route for objecting to the general size, appearance or use of a development.
It is not design control
Surveyors can consider the design insofar as necessary to understand and regulate notifiable work, but they are not there to redesign the building owner’s project.
It is not a boundary dispute mechanism
Questions about where the legal boundary lies usually need to be dealt with separately.
It is not a veto
An adjoining owner cannot normally use the Act simply to stop work they dislike. However, a new wall astride the boundary under section 1 requires consent, and special foundations on adjoining land require written consent under section 7(4). These are specific consent requirements, rather than a general veto over development.
Knowing what the Act cannot do helps you direct concerns into the right process.