The IBC handrail guidelines state that handrails must be between 34 and 38 inches.According to OSHA guidelines, handrails must be at least 30 inches but not more than 38 inches.
While you should install handrails on stairs whenever possible, not every outdoor stair construction project requires exterior stair handrails in order to meet code requirements.

Simple Exterior Handrail (for Less Than $100): I recently found myself in need of a new handrail on the steps coming down from my back porch.
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You'll find 14 exterior handrail ideas that show how Kee Klamp fittings can be configured to fit various outdoor applications.