Architect David Weingarten’s brainstorm is now a patented prefab circular stair that’s about half the cost of custom. Using a 3-foot-diameter steel pipe as supporting stringer and railing makes for easy installation. Treads and landings are attached to the pipe and then excess is carefully cut away to fabricate the helix shape. Ace Architects, 510.452.0775; www.aceland.com.
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