The front door is of utmost importance to a good feng shui home because the front door is the gateway for all the good energy - Chi - to come into your house. If you are familiar with feng shui, you also know that the front door is also often called the mouth of Chi, because this is how the house absorbs its nourishment to be able to, in turn, nourish your personal energy.
The easiest way to create a strong feng shui front door is to find the appropriate feng shui design for it - be it in colors, shapes or materials.
This is done by nourishing the feng shui element that corresponds to the direction your front door is facing.
The right choice of color is one of the major factors, feng shui-wise, that can help strengthen the feng shui energy needed for your specific front door.
I say specific front door because in feng shui the energy of the door is determined by its facing direction, so there are 8 different guidelines for front doors that face each of the 8 directions.
A South facing door is a door with the compass reading from 157.5 to 202.5 (here's how to take the compass reading of your front door).
Fire feng shui element colors are:
The element of Wood is nourishing for the Fire element/creates it, thus the Wood element colors are also good for a South-facing front door.
Wood feng shui element colors are:
To sum it up for you, best feng shui colors for a South facing front door are (in order of their auspiciousness): red, purple, strong yellow, deep orange, deep pink, green and brown colors.
Avoid the following colors for your South facing front door: blue, black and all earthy colors. These colors represent the elements of Water and Earth that are destructive/weakening for the Fire element of South (according to the five elements destructive cycle.)
Now, what can you do if you cannot repaint your front door? Can you still have a good feng shui front door if the door color cannot be changed? Yes, with a bit of effort you sure can!