CSI Divisions
CSI division deviation guides
Trade-by-trade guides to what gets flagged between a spec section and the submittal package, across 23 CSI MasterFormat divisions, whether you are sending the package or reviewing it.
Each division carries its own deviation taxonomy, tuned to the spec patterns and substitution stakes of that trade. Pick a division to see its six deviation categories, severity rules, and the CSI sections most often submitted for review.
Division 02
Existing Conditions
6 deviation categories · 15 CSI sections
Division 03
Concrete
6 deviation categories · 16 CSI sections
Division 04
Masonry
6 deviation categories · 15 CSI sections
Division 05
Metals
6 deviation categories · 13 CSI sections
Division 06
Wood, Plastics, and Composites
6 deviation categories · 16 CSI sections
Division 07
Thermal and Moisture Protection
6 deviation categories · 17 CSI sections
Division 08
Openings
6 deviation categories · 14 CSI sections
Division 09
Finishes
6 deviation categories
Division 10
Specialties
6 deviation categories · 19 CSI sections
Division 11
Equipment
6 deviation categories · 17 CSI sections
Division 12
Furnishings
6 deviation categories · 17 CSI sections
Division 13
Special Construction
6 deviation categories · 19 CSI sections
Division 14
Conveying Equipment
6 deviation categories · 13 CSI sections
Division 21
Fire Suppression
6 deviation categories · 17 CSI sections
Division 22
Plumbing
6 deviation categories · 20 CSI sections
Division 23
Heating, Ventilating, and Air Conditioning (HVAC)
6 deviation categories · 18 CSI sections
Division 25
Integrated Automation
6 deviation categories · 12 CSI sections
Division 26
Electrical
6 deviation categories · 16 CSI sections
Division 27
Communications
6 deviation categories · 18 CSI sections
Division 28
Electronic Safety and Security
6 deviation categories · 14 CSI sections
Division 31
Earthwork
6 deviation categories · 13 CSI sections
Division 32
Exterior Improvements
6 deviation categories · 15 CSI sections
Division 33
Utilities
6 deviation categories · 16 CSI sections
New to submittal review? Start with the guides or look up a term in the glossary. Every division guide is also available as plain Markdown for LLMs and note-taking.
View this page as Markdown for LLMs and note-taking.