MasterFormat Specification Divisions (CURRENT)

The Construction Specifications Institute (CSI) publishes the MasterFormat, which is the standard that is used most often for formatting construction specifications.

MasterFormat is the protected intellectual property of the Construction Specifications Institute so we cannot provide a full list of numbers and titles. Unfortunately, CSI no longer makes the list available for free.

The most current version is MasterFormat 2026. You can get access to the MasterFormat list by purchasing CSI Dynamic Standards.

MasterFormat uses a three two-digit levels for classifying construction products into categories. An optional fourth two-digit level can be included after a decimal. The first pair identify Divisions, followed a pair for the Section, and then another pair for the sub-section. In some cases, you may also see a two-digit decimal for sections that need more specific breakdowns. The example below is for Custom Hollow Metal Doors and Frames, which is in Division 8 for Openings.

MasterFormat Divisions

MasterFormat was first published in 1978 and only had 16 Divisions until the new 50-Division MasterFormat 2004 was released in late 2004. Since CSI no longer publishes the divisions, we cannot verify the current numbers and titles, but the list below was current as of 2020.

• Division 00 – Procurement and Contracting Requirements
• Division 01 – General Requirements
• Division 02 – Existing Conditions
• Division 03 – Concrete
• Division 04 – Masonry
• Division 05 – Metals
• Division 06 – Wood, Plastics, and Composites
• Division 07 – Thermal and Moisture Protection
• Division 08 – Openings
• Division 09 – Finishes
• Division 10 – Specialties
• Division 11 – Equipment
• Division 12 – Furnishings
• Division 13 – Special Construction
• Division 14 – Conveying Equipment
• Division 21 – Fire Suppression
• Division 22 – Plumbing
• Division 23 – Heating, Ventilating, and Air Conditioning (HVAC)
• Division 25 – Integrated Automation
• Division 26 – Electrical
• Division 27 – Communications
• Division 28 – Electronic Safety and Security
• Division 31 – Earthwork
• Division 32 – Site Improvements
• Division 33 – Utilities
• Division 34 – Transportation
• Division 35 – Waterway and Marine Construction
• Division 40 – Process Interconnections
• Division 41 – Material Processing and Handling Equipment
• Division 42 – Process Heating, Cooling, and Drying Equipment
• Division 43 – Process Gas and Liquid Handling, Purification, and Storage Equipment
• Division 44 – Pollution and Waste Control Equipment
• Division 45 – Industry-Specific Manufacturing Equipment
• Division 46 – Water and Wastewater Equipment
• Division 48 – Electrical Power Generation

Help make Archtoolbox better for everyone. If you found an error or out of date information in this article (even if it is just a minor typo), please let us know.