Many architecture offices have their own standards with regard to the order of sheets in a construction document set and most architects are quite opinionated about whether the Structural drawings belong before or after the Architectural drawings. However, American clients are starting to demand that architects follow the United States National CAD Standard. The information below is adapted from and meets the US National CAD Standard.

Components of the Sheet Number

Sheet Number Components


There are three components that make up sheet numbers in a set of construction documents. The first two letters, the discipline designators, identify the construction discipline that the sheet covers - architectural sheets, plumbing sheets, structural sheets, etc. The third digit, the sheet type, is a number that represents the type of drawings that are on the sheet - plans, sections, details, schedules, etc. The final two digits, the sequence numbers, are numbers that simply place the sheets in order.

Each component is explained in more detail below.

Discipline Designators

Discipline Designator

The discipline designator helps to identify the type of work that is included on the sheets. Since sheets are distributed to the different sub-contractors in the field, it is helpful for the drawings to be organized by discipline. Therefore, the plumbing contractor can easily take a set of "P" drawings, which has all of the plumbing drawings (plans, schedules, details, etc), and they will not have to sift through the unrelated electrical or structural drawings.

The discipline designator can be a single letter or a double-letter. Very large or complex projects will want to make use of the double-letter designations to help sub-divide each discipline further. For instance, on a complex hospital job with hundreds of sheets, it may be helpful to separate the electrical lighting drawings from the electrical power drawings. On a small residential project with a few dozen sheets, it is probably easy to have the lighting and power on the same sheet or sequential sheets.

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The following table indicates the primary (single) letter designations that may be used and the order that the disciplines should take. In this case, a hyphen shall be inserted in place of the secondary discipline designator so that the format remains. The second letter designators can be found in the US National CAD Standards.

DesignatorNameAdditional Description
Cover Sheet
GGeneralSheet list, symbols, code summary, etc.
HHazardous MaterialsAbatement, handling, etc.
VSurvey / Mapping
BGeotechnical
CCivil
LLandscape
SStructural
AArchitectural
IInteriors
QEquipment
FFire Protection
PPlumbing
DProcess
MMechanical
EElectrical
WDistributed Energy
TTelecommunications
RResourceExisting conditions / buildings
XOther Disciplines
ZContractor / Shop Drawings
OOperations

Sheet Types

Sheet Type

The Sheet Types designator takes the drawings of a single discipline and organizes them. Drawings are always organized from most general to most specific or specialized. Since plans are most helpful to see the overall design of the project, they come first. Elevations and sections are a bit more specific and come next followed by details and schedules, which are the most specific type of drawings.

DesignatorName
0General: Symbol legend, abbreviations, general notes
1Plans
2Elevations
3Sections
4Large Scale Drawings: plans, elevations, sections (NOT details)
5Details
6Schedules and Diagrams
7User Defined
8User Defined
93D drawings: isometric, perspective, photos
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Sequence Numbers

Sequence Number

The final component of the sheet number is the two-digit sequence number, which is between 01 and 99. The sequence numbers do not have to be sequential so that space may be left within the set for future additions.

Example Sheet Numbers

NumberSheet Description
AD107Architectural Demolition Floor Plan, seventh sheet
A-204Architectural Elevations, fourth sheet
I-316Interior Section, sixteenth sheet
QH601Hospital Equipment Schedule, first sheet
FA601Fire Alarm Diagrams, first sheet
P-102Plumbing Floor Plan, second sheet
MH402Large Scale HVAC Drawings, second sheet
MP501HVAC Piping Details, first sheet
EP110Electrical Power Plan, tenth sheet
EL103Electrical Lighting Plan, third sheet
T-505Telecommunications Details, fifth sheet
RA102Architectural Existing Building Plan, second sheet
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