construction-documentation

name

construction-documentation

description

Comprehensive construction documentation skill covering architectural drawing sets, sheet organization and numbering, drawing standards (line weights, text, hatching, dimensions), BIM Level of Development (LOD) requirements, specification writing using CSI MasterFormat, schedule production (door, window, finish, fixture), and construction administration workflows including RFI processing, submittal review, change orders, site observations, punch lists, and warranty period management.

Construction Documentation

Construction documentation translates design intent into legally binding, buildable instructions. This skill covers every aspect of producing a complete, coordinated, and code-compliant set of construction documents -- from drawing organization and graphic standards through specifications, schedules, and the architect's role during the construction phase.

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1. Drawing Set Organization

1.1 Standard Architectural Drawing Sequence

A complete architectural drawing set follows a consistent order that allows contractors, consultants, and reviewers to navigate the documents efficiently. The standard sequence is:

1. Cover Sheet -- project name, address, owner, architect, consultants, project number, issue date, building code summary, occupancy classification, construction type, area tabulation, vicinity map.
2. Drawing List -- complete index of every sheet in the set, organized by discipline with sheet number, title, and revision status.
3. General Notes -- project-wide notes, abbreviations, symbols legend, material keynote legend, accessibility standards referenced, applicable codes and editions.
4. Site Plan -- property boundaries, setbacks, easements, building footprint, grading, paving, landscaping, utilities, site lighting, stormwater management, accessibility routes.
5. Floor Plans -- every level including basement, ground, upper floors, mezzanines, and mechanical penthouse. Show walls, doors, windows, stairs, elevators, room names, room numbers, dimensions, column grid, section cut indicators, elevation markers, detail callouts.
6. Reflected Ceiling Plans (RCP) -- ceiling materials, heights, grid layout, light fixtures, diffusers, sprinkler heads, access panels, ceiling soffits, bulkheads.
7. Roof Plan -- roof slopes, drainage, overflow drains, mechanical equipment, roof access, parapet heights, expansion joints, roof penetrations, fall protection anchorage.
8. Exterior Elevations -- all four sides minimum, material indications, floor lines, ceiling lines, grade line, roof ridge/eave lines, window tags, door tags, material keynotes, vertical dimensions.
9. Building Sections -- longitudinal and transverse sections through the entire building. Show structural system, floor-to-floor heights, foundation, roof structure, wall assemblies at cut, vertical circulation, key dimensions.
10. Wall Sections -- detailed vertical cuts through typical wall assemblies from foundation to roof. Show every layer, flashing, waterproofing, insulation, vapor barriers, structural connections, window head/sill/jamb conditions.
11. Enlarged Plans -- stair plans, elevator plans, toilet rooms, kitchens, lobbies, and other complex spaces at 1:50 or 1:20 scale.
12. Interior Elevations -- wall-by-wall interior views of significant rooms: toilets, kitchens, reception areas, conference rooms. Show casework, tile layouts, fixture locations, outlet heights.
13. Stair and Elevator Details -- stair sections, handrail details, guardrail connections, nosing profiles, elevator pit, shaft dimensions, machine room layout, cab interior elevations.
14. Door Schedule and Details -- door types, frame details, hardware sets, threshold details, ADA clearance diagrams.
15. Window Schedule and Details -- window types, mullion details, sill/head/jamb sections, hardware, performance specifications.
16. Finish Schedule -- room-by-room listing of floor, base, wall, and ceiling finishes with finish codes cross-referenced to specifications.
17. Detail Sheets -- miscellaneous construction details not covered elsewhere: expansion joints, control joints, flashing, waterproofing, miscellaneous metal, signage mounting.

1.2 Sheet Numbering Conventions

Sheet numbers use a discipline prefix followed by a category digit and sequential number. The standard architectural prefix is "A":

Sheet Series	Category	Examples
A0.01	General (cover, notes)	A0.01, A0.02, A0.03
A1.01	Floor Plans	A1.01, A1.02, A1.03
A1.50	Reflected Ceiling Plans	A1.50, A1.51
A1.70	Roof Plans	A1.70, A1.71
A2.01	Exterior Elevations	A2.01, A2.02
A2.50	Interior Elevations	A2.50, A2.51, A2.52
A3.01	Building Sections	A3.01, A3.02
A3.50	Wall Sections	A3.50, A3.51
A4.01	Enlarged Plans	A4.01, A4.02
A5.01	Details	A5.01, A5.02, A5.03
A6.01	Schedules	A6.01, A6.02
A7.01	Interior Design	A7.01, A7.02

Other discipline prefixes:

• G -- General (project-wide cover sheets, code analysis)
• C -- Civil
• L -- Landscape
• S -- Structural
• M -- Mechanical
• P -- Plumbing
• FP -- Fire Protection
• E -- Electrical

1.3 Drawing Scale Conventions by Sheet Type

Sheet Type	Common Metric Scale	Imperial Equivalent
Site Plan	1:200 or 1:500	1" = 20' or 1" = 40'
Floor Plans	1:100 or 1:50	1/8" = 1' or 1/4" = 1'
Reflected Ceiling Plan	1:100 or 1:50	1/8" = 1' or 1/4" = 1'
Roof Plan	1:100 or 1:200	1/8" = 1' or 1/16" = 1'
Exterior Elevations	1:100 or 1:50	1/8" = 1' or 1/4" = 1'
Building Sections	1:100 or 1:50	1/8" = 1' or 1/4" = 1'
Wall Sections	1:20 or 1:10	3/4" = 1' or 1-1/2" = 1'
Enlarged Plans	1:50 or 1:20	1/4" = 1' or 1/2" = 1'
Interior Elevations	1:50 or 1:20	1/4" = 1' or 1/2" = 1'
Construction Details	1:10 or 1:5	1" = 1' or 3" = 1'
Stair/Elevator Details	1:20 or 1:10	1/2" = 1' or 1" = 1'

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2. Drawing Standards

2.1 Line Weights

Consistent line weights ensure drawings are legible at all reproduction sizes. The standard hierarchy:

Line Weight (mm)	Purpose
0.13	Grid lines, construction lines, hatch patterns
0.18	Hatching, fine detail, material patterns
0.25	Minor object lines, furniture, equipment
0.35	Major object lines, walls beyond cut plane
0.50	Cut lines (walls, floors, roofs in section)
0.70	Section cut lines, profile lines

In practice, line weights map to pen colors in CAD systems:

• Color 1 (Red) = 0.13mm
• Color 2 (Yellow) = 0.18mm
• Color 3 (Green) = 0.25mm
• Color 4 (Cyan) = 0.35mm
• Color 5 (Blue) = 0.50mm
• Color 6 (Magenta) = 0.70mm

2.2 Text Heights

Text height standards ensure readability when plotted:

Text Height (mm)	Usage
1.8	Dimensions, minor annotations
2.0	General notes, specifications on drawings
2.5	Room names, door/window tags
3.5	Drawing titles, subtitles
5.0	Sheet titles
7.0	Cover sheet project name

Font standards:

• Primary: Arial, Helvetica, or equivalent sans-serif
• CAD standard: SIMPLEX or ROMANS (SHX fonts)
• Avoid decorative fonts; maintain consistent font family across all sheets

2.3 Hatching Patterns

Standard material hatching in section and plan:

Material	Hatch Pattern Description
Concrete	Dot stipple or triangular aggregate pattern
Masonry (brick)	Diagonal crosshatch at 45 degrees
Masonry (CMU)	Diagonal lines with dots at block cores
Insulation (rigid)	Hatched at 45 degrees, tight spacing
Insulation (batt)	Wavy lines or scalloped pattern
Earth/soil	Random dot pattern with short dashes
Timber (sawn)	End grain circles in section, parallel lines along
Steel	Diagonal lines at 45 degrees, tight spacing
Glass	Single solid fill or single line
Membrane/sheet	Heavy single line
Plywood	Alternating parallel lines at varying angles
Gypsum board	Small "x" pattern or light stipple

2.4 Annotation Standards

• Keynotes: Numeric references linked to keynote legend; preferred over text notes for consistency. Use either sheet keynotes or reference keynotes (linked to specifications).
• Room Tags: Room number (bold, upper), room name (below), floor finish code, ceiling height.
• Door Tags: Circle with door number referencing door schedule.
• Window Tags: Diamond or hexagon with window type referencing schedule.
• Section Markers: Circle with section number (upper) and sheet number (lower), tail pointing in direction of view.
• Elevation Markers: Circle with arrow indicating viewing direction, reference number and sheet number.
• Detail Callouts: Circle or oval with detail number (upper) and sheet number (lower).
• Column Grid: Circles at grid intersections -- numbers for one axis (1, 2, 3...) and letters for the other (A, B, C...).

2.5 Dimension Styles

Three primary dimensioning methods:

1. Running Dimensions (baseline): All dimensions taken from a single reference point. Preferred for structural grids and overall building dimensions. Reduces cumulative error.

2. Chain Dimensions (continuous): Sequential dimensions from point to point. Used for wall-to-wall dimensions, opening locations. Three dimension strings typical: overall, grid-to-grid, wall-to-wall.

3. Ordinate Dimensions: X-Y coordinates from a datum point. Used in site plans and complex curved geometry.

General rules:

• Dimension to face of structure, not finish, unless specifically noting finish dimensions
• Place dimensions outside the building footprint where possible
• Use three dimension strings: overall, intermediate (grid-to-grid), and detailed (opening-to-opening)
• Dimension text should read from bottom or right side of sheet
• Use consistent units: mm for metric, feet-inches for imperial
• Avoid crossing dimension lines over each other

2.6 North Arrow and Scale Bar

• North arrow: Required on every plan drawing. Use project north (aligned to building grid) with true north indicated by separate arrow if different.
• Scale bar: Graphic scale bar required on every drawing. Numeric scale alone is insufficient because drawings may be reproduced at different sizes. Graphic bar maintains accuracy regardless of print scaling.
• Scale bar length: Typically represents a round number (1m, 5m, 10m).

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3. BIM Level of Development (LOD) Requirements

3.1 LOD Definitions

The BIM Forum LOD Specification defines the following levels:

LOD 100 -- Concept Design

• Overall building massing, volume, and area
• Generic placeholders indicating approximate size, shape, location
• Used for: conceptual analysis, early cost modeling, scheduling
• Geometric accuracy: Not reliable for measurement

LOD 200 -- Schematic Design

• Approximate geometry with approximate quantities, size, shape, location
• Non-geometric information may be attached
• Used for: schematic analysis, approximate cost estimates
• Geometric accuracy: Approximate; elements recognizable as intended type

LOD 300 -- Design Development

• Precise geometry with specific dimensions, shape, location, orientation
• Materials specified; performance criteria defined
• Used for: code compliance, design coordination, detailed cost estimates
• Geometric accuracy: Suitable for measurement and coordination

LOD 350 -- Construction Documentation

• All LOD 300 content plus interfaces with other building systems
• Connections, supports, and blocking modeled
• Coordination with other disciplines resolved
• Used for: clash detection, construction coordination, shop drawing prep
• Geometric accuracy: Fully coordinated; construction-ready

LOD 400 -- Fabrication

• Sufficient detail for fabrication and assembly
• Precise dimensions, connections, and installation information
• Used for: shop drawings, CNC fabrication, prefabrication
• Geometric accuracy: Fabrication-level precision

LOD 500 -- As-Built

• Field-verified representation of completed construction
• Actual dimensions and locations as installed
• Used for: facility management, operations, future renovation
• Geometric accuracy: Verified against field conditions

3.2 LOD Requirements by Element Type

Building Element	SD (LOD)	DD (LOD)	CD (LOD)	Fab (LOD)
Structural columns	200	300	350	400
Structural beams	200	300	350	400
Exterior walls	200	300	350	400
Interior partitions	100	300	350	350
Doors	200	300	350	400
Windows	200	300	350	400
Curtain walls	200	300	350	400
Stairs	200	300	350	400
Elevators	100	200	350	400
Mechanical equipment	100	200	350	400
Ductwork	--	200	350	400
Piping	--	200	350	400
Electrical panels	100	200	350	350
Light fixtures	--	200	350	350
Ceiling systems	100	200	350	350
Casework/millwork	100	300	350	400
Site elements	200	300	350	350

3.3 Model Coordination Requirements

At LOD 350 and above, the following coordination checks are mandatory:

• Clash detection: Hard clashes (physical intersections), soft clashes (clearance violations), and 4D clashes (scheduling conflicts)
• Spatial coordination: Verify ceiling plenum space accommodates all MEP routing with minimum clearances
• Penetration coordination: All structural penetrations identified, sized, and sleeved
• Fire separation: Rated assemblies continuous and uncompromised
• Accessibility: Clear widths, turning radii, and mounting heights verified in model

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4. Specification Writing

4.1 CSI MasterFormat Divisions

The Construction Specifications Institute (CSI) MasterFormat organizes specifications into the following divisions:

Division	Title	Typical Architectural Content
01	General Requirements	Summary, price forms, alternates, schedules, submittals, quality, temporary facilities
02	Existing Conditions	Demolition, hazmat abatement, site assessment
03	Concrete	Cast-in-place, precast, architectural concrete
04	Masonry	Unit masonry, stone assemblies, glass unit masonry
05	Metals	Structural steel, miscellaneous metals, ornamental metal
06	Wood, Plastics, Composites	Rough carpentry, finish carpentry, millwork, FRP
07	Thermal/Moisture Protection	Waterproofing, insulation, roofing, sealants, flashing
08	Openings	Doors, windows, curtain walls, hardware, glazing
09	Finishes	Plaster, gypsum board, tiling, flooring, painting
10	Specialties	Visual display, toilet accessories, signage, lockers
11	Equipment	Kitchen equipment, athletic equipment, lab equipment
12	Furnishings	Casework, window treatments, furniture
13	Special Construction	Swimming pools, clean rooms, radiation protection
14	Conveying Equipment	Elevators, escalators, dumbwaiters
21	Fire Suppression	Sprinkler systems, standpipes
22	Plumbing	Fixtures, piping, drainage
23	HVAC	Air handling, ductwork, controls
25	Integrated Automation	Building automation systems
26	Electrical	Power distribution, lighting, controls
27	Communications	Data, voice, AV systems
28	Electronic Safety/Security	Access control, CCTV, fire alarm
31	Earthwork	Grading, excavation, fill
32	Exterior Improvements	Paving, site furnishings, fencing
33	Utilities	Storm drainage, water supply, sanitary sewer
40-49	Process Integration/Equipment	Industrial processes, electrical systems

4.2 Specification Types

Prescriptive Specification

• Names the specific product, manufacturer, and model number
• Simplest to write; limits competition; maximum control
• Example: "Provide Acme Corporation Model XR-500 door closer"

Performance Specification

• States required performance criteria; allows vendor to propose solution
• Encourages innovation; more complex to evaluate
• Example: "Provide door closer capable of controlling doors up to 100 kg, with adjustable backcheck, closing speed 3-7 seconds, and complying with EN 1154 Class 4"

Proprietary Specification

• Names approved manufacturers or products with "or equal" clause
• Balance of control and competition
• Example: "Provide Acme XR-500 or approved equal meeting the following requirements..."

Reference Standard Specification

• References an industry standard (ASTM, EN, ISO) for material or performance requirements
• Example: "Concrete masonry units shall comply with ASTM C90, Grade N, Type I"

4.3 Three-Part Specification Format

Every specification section follows the CSI three-part format:

Part 1 -- General

• 1.01 Summary: Scope of work, related sections, work by others
• 1.02 References: Applicable standards (ASTM, ANSI, EN, ISO)
• 1.03 Definitions: Technical terms specific to this section
• 1.04 Submittals: Shop drawings, product data, samples, test reports
• 1.05 Quality Assurance: Installer qualifications, mock-ups, pre-installation meetings
• 1.06 Delivery, Storage, Handling: Protection requirements
• 1.07 Project Conditions: Environmental requirements for installation
• 1.08 Warranty: Duration and coverage beyond standard warranty

Part 2 -- Products

• 2.01 Materials: Base materials, acceptable standards
• 2.02 Manufactured Products: Specific products or performance criteria
• 2.03 Fabrication: Shop fabrication requirements, tolerances
• 2.04 Finishes: Surface treatments, coatings, colors
• 2.05 Source Quality Control: Factory testing, certifications

Part 3 -- Execution

• 3.01 Examination: Site conditions verification before installation
• 3.02 Preparation: Surface preparation, priming, layout
• 3.03 Installation: Step-by-step installation requirements
• 3.04 Field Quality Control: Testing, inspection requirements
• 3.05 Adjusting: Post-installation adjustment
• 3.06 Cleaning: Post-installation cleaning requirements
• 3.07 Protection: Protection of installed work during construction

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5. Schedule Production

5.1 Door Schedule

Standard door schedule columns:

Column	Description
Door Tag	Unique identifier matching plan annotation
Location	Room name or room number where door is located
Width	Clear opening width (mm or feet-inches)
Height	Clear opening height
Thickness	Door leaf thickness
Type	Single, pair, sliding, pocket, overhead, revolving
Material	Wood, hollow metal, aluminum, FRP, glass
Fire Rating	None, 20 min, 45 min, 60 min, 90 min, 3 hr
Smoke Rating	Yes/No; S-label for smoke doors
Hardware Set	Number referencing hardware group specification
Frame Type	Hollow metal, wood, aluminum; anchor type
Frame Material	Same as door or different
Glazing	Vision panel size, type, fire-rated if applicable
Finish	Paint color, stain, anodized, powder coat
Undercut	Gap at bottom for air transfer
Threshold	Type (saddle, ADA, interlocking, none)
Remarks	Special notes, ADA, security, acoustic rating

5.2 Window Schedule

Standard window schedule columns:

Column	Description
Window Tag	Unique identifier matching plan/elevation tag
Width	Overall frame width
Height	Overall frame height
Sill Height	Height from finished floor to sill
Type	Fixed, casement, awning, hopper, sliding, tilt-turn
Frame Material	Aluminum, wood, PVC, steel, fiberglass
Glazing Spec	Single, double, triple; low-e coating; gas fill
U-value	Thermal transmittance of complete window assembly
SHGC	Solar Heat Gain Coefficient
VLT	Visible Light Transmittance
STC	Sound Transmission Class
Operator Type	Handle, crank, motorized, none (fixed)
Screen	Yes/No; type (insect, solar, retractable)
Finish	Anodized, powder coat, painted; color
Fire Rating	If required by location (property line proximity)
Remarks	Safety glazing, impact-rated, blast-rated

5.3 Finish Schedule

Standard finish schedule format:

Column	Description
Room Number	Matching plan room tag
Room Name	Descriptive name
Floor Finish	Finish code (e.g., F1 = Porcelain tile)
Floor Base	Base type code (e.g., B1 = Ceramic cove base)
Wall Finish North	Finish code per wall orientation
Wall Finish South	Finish code per wall orientation
Wall Finish East	Finish code per wall orientation
Wall Finish West	Finish code per wall orientation
Ceiling Finish	Finish code (e.g., C1 = Gypsum board, painted)
Ceiling Height	Height in mm or feet-inches
Remarks	Wet area coating, antimicrobial, accent walls

Finish codes should be defined in a legend:

• F1: Porcelain tile 600x600
• F2: Vinyl plank flooring
• F3: Sealed concrete
• F4: Carpet tile
• B1: Ceramic cove base 100mm
• B2: Rubber base 100mm
• B3: Wood base 75mm
• W1: Paint on gypsum board (GWB)
• W2: Ceramic wall tile
• W3: Stone veneer
• C1: Gypsum board painted
• C2: Suspended acoustic ceiling tile
• C3: Exposed structure painted

5.4 Fixture and Equipment Schedules

Plumbing Fixture Schedule: Tag, type (WC, lavatory, sink, shower), manufacturer, model, mounting (floor, wall), supply connection, waste size, accessibility compliance, finish.

Equipment Schedule: Tag, equipment name, manufacturer, model, dimensions, weight, power requirements (voltage, phase, amperage), plumbing connections, ventilation requirements, clearances required.

5.5 Room Data Sheets

For complex program types (hospitals, laboratories, data centers), room data sheets replace or supplement finish schedules. Each room gets a dedicated sheet listing:

• Room number, name, department, and function
• Area (net, gross)
• Floor, wall, and ceiling finishes with performance requirements
• Mechanical requirements (temperature, humidity, air changes, pressure)
• Electrical requirements (circuits, outlets, dedicated power)
• Lighting requirements (lux level, color temperature)
• Plumbing requirements (fixtures, gases, vacuum)
• IT/communications requirements
• Furniture and equipment list
• Security requirements (access control level)
• Acoustic requirements (NC rating, STC between rooms)

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6. Construction Administration

6.1 Architect's Role During Construction

The architect's role during construction is defined by the Owner-Architect agreement (AIA B101 or equivalent). The architect does NOT supervise construction -- the contractor is solely responsible for means, methods, techniques, sequences, and safety. The architect performs the following:

6.2 RFI (Request for Information) Processing

• Contractor submits RFI when drawings or specifications are unclear
• Architect logs, reviews, and responds typically within 5-7 business days
• Response options: clarify intent, issue supplemental sketch (ASI), refer to specification section, defer to consultant, request contractor proposal
• All RFIs are numbered sequentially and tracked in a log
• RFIs that result in cost or schedule impact may become change orders

6.3 Submittal Review

• Contractor submits product data, shop drawings, samples, and mock-ups
• Architect reviews for conformance with design intent (not code compliance -- that remains contractor's responsibility)
• Standard turnaround: 14-21 business days from receipt
• Review stamps: Approved, Approved as Noted, Revise and Resubmit, Rejected
• Submittals requiring resubmission restart the review clock
• Architect maintains a submittal log tracking status of all items

6.4 Change Order Review

• Changes arise from: owner requests, unforeseen conditions, design errors, code changes, value engineering
• Process: Contractor submits proposal (COR), architect reviews scope and cost, recommends to owner, owner authorizes change order (CO)
• Architect evaluates: Is the work within original scope? Is the cost reasonable? Is the time extension justified?
• All change orders tracked in a log with cumulative cost impact

6.5 Site Observations

• Architect conducts periodic site observations (not continuous inspection) at intervals appropriate to the stage of construction
• Purpose: determine if work is generally in accordance with contract documents
• Architect is NOT a building inspector and does NOT certify code compliance
• Document observations in field reports with photographs
• Note deficiencies and report to contractor in writing
• Typical frequency: biweekly during active construction, weekly during critical phases (waterproofing, fireproofing, facade installation)

6.6 Payment Certificate Review

• Contractor submits monthly application for payment
• Architect reviews percentage complete by line item
• Architect certifies amount due to owner for payment
• Retainage typically held: 10% until substantial completion, reduced to 5% or released at final completion
• Architect is NOT an auditor; certification is based on observations and contractor's representations

6.7 Substantial Completion

• Defined as: the stage when the work is sufficiently complete that the owner can use it for its intended purpose
• Architect conducts substantial completion inspection
• Issues Certificate of Substantial Completion if warranted
• Begins warranty period from date of substantial completion
• Generates punch list: a detailed list of incomplete or deficient items that the contractor must correct

6.8 Punch List

• Architect walks the entire project documenting deficiencies
• Items categorized: incomplete work, damaged work, work not conforming to documents, cleaning required
• Contractor addresses all items within agreed timeframe (typically 30 days)
• Architect re-inspects to verify corrections
• Release of final retainage contingent on punch list completion

6.9 Final Completion

• All punch list items resolved
• All closeout documents received: warranties, as-built drawings, operations manuals, maintenance manuals, spare parts, keying schedule
• Architect issues Final Certificate for Payment
• Final retainage released
• Architect's services under construction administration conclude

6.10 Warranty Period

• Standard warranty period: 12 months from date of substantial completion (per AIA A201 General Conditions)
• Extended warranties for specific systems (roofing: 15-20 years, waterproofing: 10 years, mechanical equipment: 2-5 years)
• Architect may conduct 11-month warranty inspection to identify deficiencies before warranty expiration
• Owner should maintain warranty documentation for entire building life

6.11 Document Control and Record Keeping

Throughout construction, the architect maintains:

• RFI log with all responses
• Submittal log with review status
• Change order log with cumulative cost tracking
• Field report file with photographs
• Meeting minutes from all OAC (Owner-Architect-Contractor) meetings
• Correspondence log
• ASI (Architect's Supplemental Instruction) log
• Payment certification records
• Punch list and closeout tracking

All documents should be maintained in a project management information system (PMIS) with version control and audit trail. Digital platforms such as Procore, Newforma, PlanGrid, or BIM 360 are standard tools for construction document management.

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Summary

Construction documentation is the bridge between design intent and built reality. Incomplete, inconsistent, or poorly coordinated documents are the primary source of construction conflicts, cost overruns, and quality failures. Mastery of drawing organization, graphic standards, BIM coordination, specification writing, schedule production, and construction administration processes is essential for every practicing architect.

The standards in this document align with:

• AIA Document Standards (A201, B101)
• CSI MasterFormat and SectionFormat
• BIM Forum LOD Specification
• ISO 19650 (BIM Information Management)
• National CAD Standard (NCS) -- United States
• BS 1192 / PAS 1192 -- United Kingdom