How to Build Deck Stairs

Building deck stairs from scratch can be a technical, time-consuming process. A stringer can be made using 2X12 redwood or pressure treated boards, notched to accommodate the step treads. The stringer should be sloped at an angle from the ground to the deck surface at 30 to 35-degrees.

The normal rise desirable on each step is 7-inches, with a step depth of 11-inches. Most local building codes require a minimum staircase width of at least 3-feet. However, code guidelines can vary, so check to see what the local guidelines are for your area.

If building your own deck steps sounds too technical, fear not! Pre-cut stringers can be purchased at most building supply outlets, and modified for your individual needs. In many cases, purchasing ready-made stringers is a more cost and time-effective option than trying to construct your own.

Attaching Stringers Stringers are attached to the box frame of the deck with joist hangers. For added strength, 4X4 posts with footings at 4-foot intervals on each side of the staircase will serve double duty; bolt stringers to them for additional support. And then secure handrails to the top of them. Note: Be sure to trim posts to match the slope of the staircase. Plan carefully. Follow code requirements; handrails should be 30 to 36-inches above the stringer.

Treads are installed across the stringers on the notches, with or without 1-inch thick riser boards set on edge against the back of the notch; resting flush with top edge of the notch. 2X4 or 2X6 can be used for the treads, or whatever width works best. Avoid using boards with knots or cracks.

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