How to Build Outdoor Stairs
Learn how to build outdoor stairs with our detailed step-by-step guide. Follow our easy instructions to get it done right.
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0 of 6 steps completedStep-by-Step Instructions
1 Step 1: Calculate Rise and Run
Step 1: Calculate Rise and Run
Measure total height, divide by 7" (ideal rise) to get number of steps, calculate tread depth.
Construction Calculator
Calculator for stair rise and run calculations
2 Step 2: Cut Stringers
Step 2: Cut Stringers
Mark and cut 2x12 stringers using framing square, cut notches for treads.
2x12 Pressure-Treated Lumber
Treated lumber for stair stringers (12-foot)
Framing Square
Carpenter square for marking stair stringers
Circular Saw
Power saw for cutting stringers
3 Step 3: Install Stringers
Step 3: Install Stringers
Attach stringers to deck with joist hangers, secure bottom to concrete pad or footer.
Joist Hanger Brackets
Metal brackets for attaching stringers (pack)
4 Step 4: Install Treads
Step 4: Install Treads
Cut and attach 2x6 or 2x12 treads to stringers with deck screws, use 2 boards per tread.
2x6 Decking Boards
Treated boards for stair treads (8-foot)
5 Step 5: Install Risers if Desired
Step 5: Install Risers if Desired
Optional: attach riser boards between treads for finished look and safety.
1x8 Riser Boards
Boards for stair risers (8-foot)
6 Step 6: Add Handrail
Step 6: Add Handrail
Install railing on one or both sides if stairs have 3+ steps (code requirement).
Stair Railing Kit
Pre-made railing for outdoor stairs