Beyond what is recommended by fabricators, how far should traces be from SMD pads?
In many situations, the manufacturing limits are the important limits that will guide your design.

Some common situations where you might need to consider other limits:


If your circuit carries voltages above 50 V, you may need to consider creepage and clearance distances for safety isolation.
If your circuit carries frequencies above about 500 MHz (more to the point, if your circuit size is more than 1/20 of the wavelength related to your signal frequency) you may need to consider controlled impedance or other distributed circuit effects.
If your circuit includes sensitive high-impedance nodes in an analog circuit, you might need to consider leakage currents.