CSI Divisions
CSI division deviation guides
Trade-by-trade guides to what deviates between a spec section and a sub's submittal, across 23 CSI MasterFormat divisions.
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.