The best organization style to write an instructional guide describing how to build a bird house would be the sequential pattern.
A sequential pattern of organization is a step-by-step sequence used to describe a specific process. Steps and sub-steps are clearly differentiated in paragraphs and sentences respectively by using this pattern. Furthermore, it organizes information in a way that it makes easier for readers to follow these steps.
In the case of the instructional guide, it is effective to use a sequential pattern of organization because it will present the instructions and steps to build a bird house in a precise order and in the clearer way possible for the reader. Therefore, this pattern allows a writer to display the steps as well as the sub-steps of any process sequentially but also to highlight its key parts.