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Construction drawing types explained

Understanding the organization of construction documents by discipline and sheet type

Sheet Numbering System

Construction drawings follow a standard organization using the NCS (National CAD Standard) or similar systems. Each sheet is numbered with a prefix letter indicating the discipline, followed by a number indicating the sheet type and sequence.

Example: A-201
  • A = Architectural discipline
  • 2 = Sheet type (2 = Elevations)
  • 01 = Sequence number (first sheet of type)

Drawing Types by Discipline

GGeneral

Cover sheet, drawing index, symbols legend, abbreviations, general notes

G-001 Cover SheetG-002 Drawing IndexG-003 Symbol Legend
CCivil

Site plans, grading, utilities, erosion control, paving, landscaping

C-100 Site PlanC-200 Grading PlanC-300 Utility PlanC-400 Details
LLandscape

Planting plans, irrigation, landscape details, hardscape

L-100 Landscape PlanL-200 Planting PlanL-300 Irrigation Plan
AArchitectural

Floor plans, elevations, sections, details, door/window schedules, finish schedules

A-100 Floor PlansA-200 ElevationsA-300 SectionsA-400 DetailsA-500 Interior ElevationsA-600 Schedules
SStructural

Foundation plans, framing plans, structural details, schedules

S-100 Foundation PlanS-200 Framing PlansS-300 SectionsS-400 DetailsS-500 Schedules
MMechanical (HVAC)

HVAC plans, equipment schedules, ductwork layouts, control diagrams

M-100 HVAC Floor PlansM-200 Roof PlanM-300 DetailsM-400 SchedulesM-500 Controls
PPlumbing

Plumbing plans, riser diagrams, fixture schedules, details

P-100 Floor PlansP-200 Roof/Site PlanP-300 Riser DiagramsP-400 DetailsP-500 Schedules
EElectrical

Power plans, lighting plans, panel schedules, one-line diagrams

E-100 Site PlanE-200 Power PlansE-300 Lighting PlansE-400 One-Line DiagramsE-500 Panel Schedules
FPFire Protection

Sprinkler plans, riser diagrams, fire alarm plans, details

FP-100 Sprinkler PlansFP-200 Riser DiagramsFP-300 Details
FAFire Alarm

Fire alarm device plans, riser diagrams, panel schedules

FA-100 Fire Alarm PlansFA-200 Riser Diagrams
TTelecommunications

Data/voice plans, rack elevations, pathway plans

T-100 Floor PlansT-200 Rack ElevationsT-300 Details
IInteriors

Interior design plans, furniture layouts, millwork details

I-100 Floor PlansI-200 Furniture PlansI-300 Details

Common Sheet Type Numbers

NumberTypeExamples
0General / NotesA-001 General Notes, S-001 General Notes
1PlansA-101 Floor Plan, M-101 HVAC Plan
2ElevationsA-201 Exterior Elevations
3SectionsA-301 Building Sections, S-301 Wall Sections
4Large Scale PlansA-401 Enlarged Plans, A-402 Stair Plans
5DetailsA-501 Wall Details, S-501 Connection Details
6Schedules / DiagramsA-601 Door Schedule, E-601 Panel Schedules
7-9Specialty / OtherA-701 Finish Schedule, A-801 Reflected Ceiling

Tips for Navigating Drawings

  • Start with the index, G-002 lists all sheets and helps you find what you need
  • Read general notes first, X-001 sheets contain critical project-wide information, including construction abbreviations
  • Follow reference marks, Details and sections are cross-referenced; trace them. Learn more about architectural plan symbols to understand reference marks
  • Check multiple disciplines, Floor plans from A, M, E, P should all coordinate
  • Use the legend, Symbol meanings vary; always check the project legend. Each discipline has its own symbols, such as electrical plan symbols

Keep exploring

Companion references for navigating construction document sets.

Construction Abbreviations

200+ common drawing abbreviations

Standard Sheet Organization

NCS sheet naming conventions

Drawing Scale Guide

Understanding architectural scales

How to Read Architectural Drawings

Complete guide to floor plans

Search across all drawing types

Helonic indexes your entire drawing set so you can search for information across all disciplines. Find references, trace details, and identify coordination issues in seconds.