Figure 1.1 indicates the basic information that will be needed on most plans. The plan is not meant as a solution to all situations but to provide good grounding. If you produce a drawing something like this you are well on the way to getting approval to your scheme. For a typical house extension plan, the following minimum details will probably be required by Planning and/or Building Control Departments (full details concerning Planning and Building Control are provided later):
(a) Plan of the existing (for a ground floor extension, a plan of the ground floor will probably suffice) – minimum scale 1:100 (1:50 is preferred) with drainage details.