ISM-1645 ASD Information Security Manual (ISM)

Maintain and Verify Floor Plan Diagrams Regularly

Regularly update and check floor plans to ensure accuracy and functionality.

Proactive Non-classified OFFICIAL: Sensitive PROTECTED SECRET TOP SECRET Secure facilities ASD Information Security Manual Guidelines for communications infrastructure Equipment maintenance

🏛️ Framework

ASD Information Security Manual (ISM)

🧭 Control effect

Proactive

🔐 Classifications

NC, OS, P, S, TS

🗓️ ISM last updated

Nov 2022

✏️ Control Stack last updated

22 Feb 2026

🎯 E8 maturity levels

N/A

Guideline

Guidelines for communications infrastructure

Section

Cabling infrastructure

Topic

Floor Plan Diagrams

Official control statement

Floor plan diagrams are developed, implemented, maintained and verified on a regular basis.

Source: ASD Information Security Manual (ISM)

Plain language

Regularly updating and verifying your business's floor plan diagrams ensures that any changes are accurately reflected, like moving walls or rerouting cables. This is important because incorrect floor plans can lead to confusion, hinder emergency responses, or disrupt daily operations.

Why it matters

Incorrect floor plans can mislead emergency responders, delay evacuations and disrupt operations, increasing risk during critical incidents.

Operational notes

Verify floor plan diagrams after any fit-out or access change, and re-verify on a set schedule so responders and staff can rely on them during incidents.

Implementation tips

Office Manager: Ensure floor plans are updated when any physical changes are made. Work with maintenance staff to keep track of renovations or reconfigurations, then update the floor plan diagrams accordingly.
IT Team: Verify the accuracy of the current floor plan diagrams against the physical layout every six months. Walk through the premises to cross-check diagrams with actual cable placements and network points.
Building Maintenance: When completing any building work, provide immediate updates to the office manager about structural or layout changes. This allows for quick updates to floor plan diagrams.
Safety Manager: Conduct regular training sessions with staff using the most current floor plan diagrams. Use these sessions to discuss emergency exits and cable infrastructure paths.
Senior Management: Schedule an annual review of your organisation's floor plans to ensure they align with strategic goals, such as planned expansions or reorganizations. Engage with all relevant parties to ensure all views are considered.

Audit / evidence tips

Ask: the latest floor plan diagrams: Request a copy of the organisation's current floor plan diagrams

Good: the diagrams match every room and cable location exactly
Good: there is a detailed record with the date and what changes were implemented
Ask: the schedule of plan reviews: Request the schedule or calendar entries for reviewing the floor plans

Good: a visible, consistent schedule that is followed without fail
Good: staff are trained yearly or after substantial changes, with attendee feedback
Ask: to see the reaction plans for changes: Find a documented procedure for how changes in infrastructure or building layout are handled

Good: clear steps that include prompt plan updates and verification

Cross-framework mappings

How ISM-1645 relates to controls across ISO/IEC 27001, Essential Eight, and ASD ISM.

These mappings show relationships between controls across frameworks. They do not imply full equivalence or certification.

ISO 27001

Control	Notes	Details
Partially meets (2)
Annex A 7.3	ISM-1645 requires organisations to develop, maintain, and regularly verify floor plan diagrams to ensure they remain accurate and usable
Annex A 7.5	ISM-1645 requires organisations to develop, maintain, and regularly verify floor plan diagrams to ensure the diagrams accurately represen...