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Curved stairs can add interest to a deck, and they sometimes solve design and layout issues. They can also be a profitable upsell, and they’re not that hard to build; after you’ve done a couple, the process becomes ingrained and goes quickly.
My method has four basic steps: layout, stringer assembly, tread and riser assembly, and finish work. None of the work requires specialized tools or jigs, and everything can be done on site. The key to my process is a set of temporary 2x4 stud walls that I use as a layout tool and as the form for laminating the curved plywood stringers.