U.S. Intelligence Community Manual for Physical Security Standards for Sensitive Compartmented Information Facilities (SCIFs) [open pdf - 235KB]
Physical security standards are hereby established governing the construction and protection of facilities for storing, processing, and discussing Sensitive Compartmented Information (SCI) which requires extraordinary security safeguards. Compliance with this DCID 1/21 Implementing Manual (hereafter referred to as the "Manual") is mandatory for all Sensitive Compartmented Information Facilities (SCIFs) established after the effective date of this manual, including those that make substantial renovations to existing SCIFs. Those SCIFs approved prior to the effective date of this Manual will not require modification to meet these standards.
Director of Central Intelligence Directive, no 1/21