Did you know you can get a Constructor 13 upgrade for only $199
or a Residential Wire Pro 4 upgrade for only $119.

Order Today - Call 1-800-680-7638 or 1-406-293-4977.

Constructor - Ladder Diagram Software Residential Wire Pro - Electrical Floor-plans PLC, Motor Control and more..     Buy Constructor 13 More Info Constructor 13    Buy Residential Wire Pro 4 More Info RWP 4       More Info on Our Other Electrical Products

    Create, Test and Print Electrical Ladder Diagrams         Create Residential Electrical Floor-plans Quickly      Learn PLC's, Motor Control, Hydraulics and More

Product Support

TypographyHelp for installing your software, using your software, installing patches or upgrades, or technical support for all our products is provided through our support section. If you would like to speak directly to a Technical Support Representative, Please call us: 1-406-293-3616. We are here to assist you between the hours of 8:00am - 4:30pm MST (M-F)


We've Just Released Our Residential Wire Pro 4.0 Electrical Floor Plan Software

TypographyLots of great new features, like improved PDF import features, inventory groups and much more...
Take a look and download a Free 60 day trial.

New - Residential Wire Pro 4.0

Over 20 Years and Still Going Strong.

We've manufactured and sold quality electrical design and training software for over 20 years. Thank you for your support, ideas and suggestions over the years.
Our website has just been updated and re-designed and hopefully everything is working correctly. If you spot a problem please let us know about it.


Kevin Christensen
VP CMH Software

Contact Us

Manufacturing quality electrical software since 1994

TypographyHere are some quick buy links to some of our most popular products. Join the thousands of electrical contractors, corporations, electricians, engineers, training centers and schools that have purchased our software since 1994.

Buy Constructor 13 Buy Residential Wire Pro Buy Instructor Buy PLC Trainer Buy Posters See all Products

Download trial and Demos of our software

TypographyHere is a quick link to our download page where you can download 60 day trials, demos and PDF brochures.

Download Now

Monthly Specials for March 2018

Please check back every month for money saving specials on our software. These special monthly sales are for end users only - no sales to distributors. School Instructors and Students: Please see our school discount page for academic discounts.

Upgrade your Constructor version 6-12 to version 13 for only $199

Plus buy a Constructor or a Constructor upgrade and get the PLC I/O library (Allen Bradley, Automation Direct, GE, Omron, Siemens and more) for only
$199 $99 - Save $100

Constructor Information

Residential Wire Pro 4.0 for only $249 or upgrade for $119
Now with improved PDF Import and Export

Residential Wire Pro Information


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