How to Build Strong, Code-Compliant Deck Stairs with Stringers

Building a solid set of outdoor stairs is one of the most important—yet often overlooked—parts of any deck or porch project. Well-constructed stringer steps do more than provide access from point A to B; they boost curb appeal, improve safety, and ensure code compliance for your structure. With the right materials, a few essential tools, and a clear plan, building your own deck stairs can be a rewarding DIY project that stands the test of time.

Step 1: Plan and Measure for Safe, Even Deck Stairs

Every strong staircase starts with precise measurements and a clear layout. Begin by measuring your total rise—the vertical distance from the ground or landing up to the top of your deck surface. Then, determine the total run, or how far your stairs will extend outward.

From here, you’ll calculate each step’s rise (height) and run (depth). Most building codes require a rise between 7 and 7.75 inches and a run between 10 and 11 inches. Keep it consistent—any variation from one step to the next can be a tripping hazard and may cause your stairs to fail inspection.

Pro Tip: Use a story pole—a marked scrap board—to transfer step heights quickly and consistently to each stringer.

Step 2: Mark and Cut Your Stair Stringers

You’ll typically use 2×12 pressure-treated lumber for your deck stair stringers, offering the depth and strength needed for long-term durability. Grab a framing square with stair gauges to mark out your rise and run on the stringer board.

Take your time during this step—accuracy here means stability later. Every cut must match perfectly across all your stringers.

Use a circular saw for the long, straight cuts, then clean up the inside corners with a jigsaw to avoid overcutting and weakening the lumber. Sharp blades are a must for clean, safe cuts.

Step 3: Install and Secure Your Stair Stringers

Before fastening anything, test-fit your stringers to ensure proper alignment with the deck’s rim joist or landing. They should sit level and plumb, with the bottom resting on a stable, non-dirt surface like concrete or pavers.

For fastening, skip the nails. Use structural screws, carriage bolts, and metal stair hangers to firmly anchor your stringers to the deck frame. This setup resists movement, adds shear strength, and ensures your stairs hold up under years of use.

Pro Tip: Always use exterior-grade fasteners rated for pressure-treated wood—available at Cardinal Home Center—to prevent corrosion and preserve strength.

Step 4: Add Treads and Risers with Durable, Low-Maintenance Materials

With the stringers locked in place, it’s time to install your deck stair treads and optional risers. Treads are the horizontal boards you step on, while risers (optional but recommended) are the vertical pieces between each step.

Choose materials that can take a beating:

• Treated pine, cedar, or redwood offer classic, rot-resistant performance.
• Composite decking and PVC stair boards give you a modern look with virtually no maintenance. They also resist warping, insects, and fading.

Install risers first, flush with your cuts, then follow with the treads. Use deck screws—preferably color-matched if using composite—and countersink for a clean finish. Maintain a consistent tread overhang (around ¾” to 1″) for comfort and safety.

Final Checks: Code, Appearance, and Long-Term Strength

Before calling the job done, double-check your stair dimensions against local building codes. Confirm tread depth, riser height, stair width, and handrail requirements if applicable.

Also, inspect for:

• Level treads and tight fasteners
• Smooth, splinter-free surfaces
• Stable footing at the base

Build Your Outdoor Steps with Help from Cardinal Home Center

Creating safe, attractive deck stairs is easier when you start with the right materials and expert guidance. Whether you need treated lumber, composite stair treads, fasteners, or cutting tools, Cardinal Home Center has everything to help you build with confidence.

Stop by or contact your local Cardinal team today—we’ll walk you through your material list and help you get it done right the first time.