Standard Sheet Organization
Understanding the NCS (National CAD Standard) and AIA CAD Layer Guidelines for construction document organization. Learn why sheets are named A-101, S-201, or M-301.
Anatomy of a Sheet Number
Sheet Type Numbers
Discipline Designators (NCS)
Project information applicable to all disciplines. Includes cover sheets, indexes, general notes, code summaries, and project-wide legends.
Hazardous material surveys, abatement drawings, and remediation plans. Common on renovation projects with asbestos or lead paint.
Existing conditions surveys, topographic mapping, and property boundary documentation.
Subsurface investigation data, boring logs, and geotechnical recommendations.
Site work including grading, paving, utilities, stormwater management, and erosion control.
Landscape design including planting, hardscape, irrigation, and site furnishings.
Demolition scope for renovation projects. Shows elements to be removed, protected, or relocated.
Building design including floor plans, elevations, sections, details, and finish schedules.
Interior design including furniture layouts, interior elevations, millwork, and finish selections.
Specialty equipment layouts for kitchens, labs, medical facilities, and other specialized spaces.
Structural systems including foundations, framing, connections, and reinforcing details.
HVAC systems including ductwork, piping, equipment, and controls.
Plumbing systems including domestic water, sanitary, storm, and natural gas.
Fire suppression systems including sprinklers, standpipes, and fire pumps.
Electrical systems including power distribution, lighting, and emergency systems.
Low voltage systems including data, voice, AV, and structured cabling.
Reference and resource materials, often used for specifications or product information.
Disciplines not covered by standard designators, or project-specific special systems.
Typical Drawing Set Order
Sheets are organized from general to specific, and from site to building to systems. Civil and site work come before architecture, which comes before structure and MEP.
Common Sheet Number Quick Reference
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Try Automated Drawing Review FreeBased on the U.S. National CAD Standard (NCS) and AIA CAD Layer Guidelines. Individual firms may use variations. Always check project-specific standards.