*NEW* The Constructor 16 is now available. Take a look at the Constructor 16 - Free Trial.

Schools, we have Remote Learning Options for the Constructor 16 - School/Student Information

Did you know you can get a Constructor 16 upgrade for $199 (Version 15 users)
or $249 (Version 14 users). A Residential Wire Pro 5 upgrade is only $149.

Order Online Today or Call 1-800-680-7638 or 1-406-293-4977 for more information.

Constructor - Ladder Diagram Software Residential Wire Pro - Electrical Floor-plans PLC, Motor Control and more..     Buy Constructor 16 More Info Constructor 16    Buy Residential Wire Pro 5 More Info RWP 5       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 - 4:15pm MST (M-F)


We now have a Remote Access Constructor License for schools

Train your students remotely. See our School/Student page for more information or give us a call.

We've released Our Constructor 16 Electrical Ladder Diagram Software

TypographyCheck out some of the new features.
Take a look and download a Free trial.

Constructor 16

We've released Our Residential Wire Pro 5.0 Electrical Floor Plan Software

TypographyCheck out the better PDF import export features including higher resolution.
Take a look and download a Free trial.

Residential Wire Pro 5.0

Over 30 Years and Still Going Strong.

We've manufactured and sold quality electrical design and training software for over 30 years. Thank you for your support, ideas and suggestions over the years.


Kevin Christensen
VP CMH Software

Contact Us

Manufacturing quality electrical software since 1994

hour-glassHere 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.

Constructor 16 - Electrical Ladder diagram Software

Residential Wire Pro 5 - Electrical Floor-Plan Software

Buy Constructor 16 Buy Residential Wire Pro 5 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 free trials, demos and PDF brochures.

Download Now

Monthly Specials for July 2024

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 15 to version 16 for only $199

Constructor Information

Upgrade your Constructor version 14 to version 16 for only $249

Constructor Information

Upgrade your Constructor version 13 to version 16 for only $299

Constructor Information

Upgrade your Constructor version 12 to version 16 for only $349

Constructor Information

Residential Wire Pro 5.0 for only $299 or upgrade from RWP 4.0 for $149
Now with improved PDF Import and Export

Residential Wire Pro Information


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