AIA vs ISO 13567: Which Layer Naming Convention Should You Use?

Choosing a layer naming convention is one of the first decisions you make when setting up CAD standards. The two dominant options — AIA/NCS and ISO 13567 — each have strengths, and the right choice depends on where you work, who your clients are, and how your team operates.

AIA/NCS at a Glance

The AIA (American Institute of Architects) layer naming system, formalized in the National CAD Standard (NCS), uses a readable, discipline-based format:

A-WALL-FULL
S-COLS
M-DUCT-SUPL
E-LITE-EMER

Strengths

• Readable: You can guess what A-WALL means without a reference sheet
• Widely adopted: Standard in the US, required by many government agencies (GSA, DoD)
• Well-documented: NCS provides complete layer lists for every discipline
• Familiar: Most US-trained CAD users already know it

Weaknesses

• US-centric: Less common outside North America
• Rigid categories: Some firms find the predefined categories limiting
• Long names: Fully qualified names like A-WALL-FULL-DEMO can get verbose

ISO 13567 at a Glance

The international standard uses a more structured, codified format:

A-28-M_L2
S-21-M
M-63-M_EX
E-72-M_NW

Strengths

• International: Recognized globally, essential for cross-border projects
• Compact: Numeric codes keep names shorter
• Systematic: Codes map to building element classifications (CI/SfB, Uniclass)
• EU compliance: Often required for public sector projects in Europe

Weaknesses

• Less readable: A-28-M isn't as intuitive as A-WALL
• Learning curve: Team needs to memorize or reference code tables
• Variants: Different countries have adapted ISO 13567 differently (UNI 11337 in Italy, BS 1192 in the UK)

Side-by-Side Comparison

When to Use AIA

• Your firm is based in the US
• You work on federal government projects
• Your team is already trained on AIA naming
• You collaborate primarily with US-based consultants
• Client contracts specify AIA/NCS compliance

When to Use ISO 13567

• You work on international projects
• Your firm is based in Europe, Asia, or the Middle East
• EU public sector contracts require it
• You need compatibility with BIM classification systems
• You collaborate with firms using European standards

The Hybrid Approach

Many firms use a hybrid: AIA-style readable names with ISO-compatible structure. For example:

A-WALL-M_EX    (AIA discipline + element, ISO presentation + status)

This gives you readability and international compatibility. The key is to be consistent within your firm.

What About Custom Standards?

Some firms develop entirely custom naming. This works fine if:

• You document it thoroughly
• You enforce it consistently
• You have a process for converting incoming files

The risk is isolation — custom standards don't interoperate with anyone else's files without translation.

Automating the Translation

The real challenge isn't choosing a standard — it's converting files between standards. When a consultant sends you a DWG with their naming convention, you need to translate every layer to yours.

This is where automation shines. Instead of manually mapping WALL-NEW to A-WALL-FULL one file at a time, CAD standards software like MorphoCAD can learn your mapping preferences and apply them instantly across hundreds of layers -- a true layer translator alternative that understands intent, not just strings.

Making the Decision

Ask yourself three questions:

1. Who are your clients? If they require a specific standard, that's your answer.
2. Where do you operate? US = AIA, International = ISO, is a reasonable default.
3. What does your team know? Switching standards has a training cost. Factor that in.

The best standard is the one your team actually follows. Pick one, document it, and enforce it.

MorphoCAD supports both AIA and ISO 13567 templates out of the box -- the smartest layer translator alternative available. Browse standard packs or start a free trial.