Design / Build

Streamlined processes. Faster job completion.

A Design / Build project with Willis Mechanical has many advantages over traditional plan and spec jobs. Here's why...

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One company, answering to you.

Design / Build makes projects better. Here are some reasons why:

We work with you from preconstruction to completion: integrating and streamlining the design, engineering, detailing, fabrication, and installation of your mechanical and controls systems.

Willis Mechanical anticipates and resolves issues in the preconstruction and design phase in order to eliminate unplanned costs during construction. We complete your drawings accurately and promptly.

In the end, it comes down to people. Our team is comprised of experienced professional engineers, project managers, fabricators, installers, and maintenance professionals. We answer to you.

The Process

What to expect

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WMI works with the customer to identify the scope of the project or renovation.



Engineering and Preconstruction. Equipment selected, costs counted, schedules made.



Upon approval from customer, equipment is ordered and construction is completed.

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Continued Service

Upon successful start up, facility is returned with complimentary full maintenance agreement from Willis Mechanical Service Department to maximize lifespan, effectiveness, and uptime of your new systems.