What's My MasterFormat® Number?

MasterFormat® is the master list of titles and numbers used to organize specifications and other project information for most commercial building design and construction projects in North America. It lists titles and section numbers for organizing data about construction requirements, products, and activities. By standardizing such information, MasterFormat® facilitates communication among architects, specifiers, contractors and suppliers, which helps them meet building owners’ requirements, timelines and budgets.

CSI and CSC members also have free access to the Numbers and Titles Tool. If you’re not a member, you can join now. Or, order a copy of MasterFormat® in CSI’s store – you’ll get access to the Numbers and Titles Tool for two years with your purchase of the full document.


Converting a number from 1995 to current edition of MasterFormat?

In 2004, MasterFormat® expanded from using 5-digit section numbers arranged into 16 Divisions to 6-digit section numbers in a 50 Division arrangement.

The current editions of MasterFormat® are updated every two years based on user proposals and other demands for change.

Published copies of the full MasterFormat® standard and the MasterFormat website include a transition matrix to help you convert any 95 number to a current edition number.


Got a tough question?

Many CSI members offer presentations on MasterFormat® – look for them in CSI’s Directory. If you’re searching for someone to help you convert your specification masters, CSI recommends you hire a CSI member who is a Certified Construction Specifier (CCS) – you can find them in CSI's Directory.