Check local building codes, permits, and required dimensions
Measure total rise from ground to landing
Determine stair count by dividing rise by desired riser height
Set consistent riser height and tread depth
Choose durable outdoor materials such as pressure-treated lumber, concrete, stone, or composite
Mark stair layout on site
Excavate and level the base area
Install a compacted gravel or concrete footing base
Build or place stringers, side walls, or forms
Cut stair stringers accurately if using wood
Secure stringers to the upper landing and lower support
Install risers and treads with weather-resistant fasteners
Ensure each tread is level and each riser is uniform
Add drainage gaps or slope where required
Anchor all components firmly
Install handrails and guardrails if required
Seal, stain, or treat wood surfaces for weather resistance
Check stability, alignment, and code compliance before use