Simple facade design for buildings can be done as follows:

Simplicity in lines and shapes:
Use simple lines and basic shapes like rectangles, triangles, and circles.
Avoid complicated details and hedged designs.
Simple and harmonious colors:
Choosing simple and calm colors for the facade.
Combining colors so that they are compatible with each other.
Use of simple materials:
Use common materials such as stone, brick or wood.
Avoiding complex and expensive materials.

Choose calm and neutral colors for the facade.
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