What evidence do auditors commonly ask for on PS-03 Perimeter Protection?

Resistance class certificates for external doors, windows and locking cylinders; Shell construction drawings showing the wall, roof and floor build up; Coverage plan for intrusion detection on the outer skin of the building; Maintenance and function test records for perimeter alarm contacts.

What is the most common gap auditors find on PS-03?

Resistance ratings claimed for the main entrance while service and loading doors are ordinary construction

BSI C5 (121-criteria catalogue) · C5: Physical Security

`PS-03` Perimeter Protection

Build the outer shell of cloud service buildings to physically resist and detect intrusion, with external doors, windows, walls and locking mechanisms that withstand a burglary attempt for at least ten minutes.

Source: BSI C5 (121-criteria catalogue), PS-03. The statement above is our statement of the clause, read from the published text and cited so you can check it against the official text, not the instrument verbatim. Open BSI C5 (121-criteria catalogue) in the compliance library.

The edition of the catalogue is not stamped here; check the edition your attestation is issued against.

artefacts

held by a system

at each review

hard

to go live

Physical access / facilities

where the evidence lives

teal = a system already holds it · olive = produced at each review. To go live: easy when half or more of the artefacts are already held by a system, moderate from a quarter to a half, hard below a quarter.

These are the artefacts auditors commonly ask for on this requirement, our guidance rather than text from the standard. Your assessor decides what is sufficient in your context, and asks for samples across the period when a report covers one.

system holds itEvidence a system already holds

none for this control

periodic reviewEvidence produced at each review

Resistance class certificates for external doors, windows and locking cylinders · Physical access / facilities
Maintenance and function test records for perimeter alarm contacts · Physical access / facilities

governing documentDocuments that govern the control

Shell construction drawings showing the wall, roof and floor build up · Policy repository / GRC workspace
Coverage plan for intrusion detection on the outer skin of the building · Policy repository / GRC workspace

First move

No system holds this evidence for you: it is people and documents. Reminders and routing to the owner still save time. Put the document under version control with an owner and review date, and log each review as a record with reviewer and date.

Common gaps auditors find

Resistance ratings claimed for the main entrance while service and loading doors are ordinary construction
False ceilings or raised floors permitting a rated wall to be bypassed
Roof lights and ventilation openings excluded from the resistance assessment
Alarm zones disabled during building works and never re enabled afterwards

Do this for your whole sheet

Paste the rows you run your controls from and get this mapping for every control at once, with the periodic-review ones flagged and a first move per row. No account for the first run.

Build my evidence sheet

PS-02 Redundancy model · PS-04 Physical site access control