Check local building codes and obtain required permits
Determine the deck height and step layout
Measure the rise from the deck surface to the ground
Calculate the number of steps needed
Cut stair stringers to the correct dimensions
Attach a ledger or support board if required by the design
Secure the stringers to the deck frame with approved hardware
Ensure the stringers are plumb, level, and evenly spaced
Install blocking or additional support under the stair connection if needed
Fasten the treads to the stringers with exterior-rated screws
Install risers if the stair design includes them
Verify consistent step height and tread depth
Add handrails and guardrails where required
Use corrosion-resistant fasteners and connectors
Inspect all connections for stability before use