Check local building codes and permit requirements
Measure the deck perimeter and railing height requirements
Mark post locations at corners, ends, and intervals required by code
Select pressure-treated lumber, composite, metal, or approved railing materials
Cut and prepare posts, rails, balusters, and fasteners
Secure posts to the deck framing with approved post bases or through-bolts
Ensure posts are plumb and properly spaced
Install top and bottom rails between posts
Attach balusters, pickets, or panels with code-compliant spacing
Keep openings small enough to prevent a 4-inch sphere from passing through
Install a graspable handrail if required by code
Reinforce all connections with corrosion-resistant screws, bolts, or brackets
Check railing height, alignment, and structural stability
Sand rough edges and seal, stain, or paint exposed wood
Inspect all fasteners and joints before use
Recheck the finished railing for compliance and strength