This is by far the most common way that most changes are made; it is also the simplest and least expensive. All the plans used today for construction are printed on white paper with black or blue line lettering, not the white lines on blue paper of years ago. Because of this notations are easily made on these prints. They can be made by pen, pencil, or a red line pencil, which stands our clearly, - hence the term “red-lining”.
Red-lining is not suitable for major changes, but is preferred for the vast majority of simple changes, such as:
Shifting of interior walls that do not affect structure or spans.
Extending a portion of the house lengthwise in a manner that has no effect on structural spans.
Material changes, specifications, fixtures, cabinet layouts, contract provisions, etc.
Shifting, adding or changing windows and/or doors.
Addition or deletion of fireplaces, garages, false dormers, raised or dropped ceilings, etc.
However, if your red-lining involves other than these basic changes it is best done by an experienced residential designer who is familiar with your local codes and would know if the change requires further input from a local engineering professional. Since plans may not be photocopied make sure to order enough sets – usually at least 10 – so each can be noted with the proposed changes.
A red-line set usually is accepted for contracts by most lending institutions. Some building departments may not accept red-lines, if you are building in very high wind zones or flood zones where local engineering is required red-lining will most likely be unacceptable, it’s always best to check with them before you purchase a use license.