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•  Create and download as many specs as you wish.
•  No e-mail address or other identification is required.

•  Create an online account to store and share your projects
•  Create, edit, and download specs
•  Protect specs against a lost Internet connection
•  Store specs online
•  Your information and specs are kept private

Important Notice

SpecBuilder will be offline periodically November 13th and 14th as we upgrade the site and move it to a new hosting environment.  This is being done to address several security and performance issues. As part of these changes, we are upgrading the encryption algorithm used to store passwords. Because of this, you will need to use the “Forgot your password?” link to set a new password when logging in for the first time after the upgrade. 

Please make sure your email address is set correctly in your user profile prior to the November 13th upgrade to make the password reset process go as smoothly as possible.

What makes CtrlSpecBuilder
unlike any other specifications

•  Specifications are open and non-proprietary
•  Specifications include sequences, schematics, point lists, trends, alarms, and other key requirements
•  Specifications are created in English or metric units
•  Options for BACnet, web-based UI, XML/SOAP interface, electrical demand reduction, and more
•  Based on ASHRAE Guideline 13, with options to use CSI MasterFormat 95 or 2011
•  Automatic design review which identifies possible conflicts
•  Features are based on user feedback
•  It's free

5 simple steps! Learn more
Read our Frequently Asked Questions

Tutorial: View the Tutorial

Useful links on specifications and HVAC controls.

Please submit suggestions or report problems.