Spiral Staircase Plan 1800mm Diameter CAD Drawing with Section Details

This Spiral Staircase Plan AutoCAD DWG file presents a detailed architectural drawing prepared with accurate measurements and technical specifications. The layout includes a circular staircase plan with an approximate 1800mm overall diameter, central support column, evenly distributed treads, and radial step arrangement. The drawing also provides vertical and horizontal sectional views showing riser height, tread depth, landing connection, base foundation, and handrail fixing points. All structural elements are properly annotated, making the file suitable for construction documentation, fabrication reference, and site execution. This CAD drawing is designed for architects, civil engineers, interior designers, builders, and drafting professionals who require reliable spiral staircase planning details. It supports integration with AutoCAD, Revit, 3ds Max, and SketchUp for seamless workflow coordination. The file helps in space-efficient stair design for residential, commercial, and industrial projects. By using this DWG file, professionals can improve design accuracy, ensure safety compliance, and minimize on-site errors through precise dimensional guidance and clear structural representation.