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Who is Cx4b?

Commissioning for Buildings – also known as Cx4b –

is an independent consulting engineering firm dedicated to providing quality engineering services and expert commissioning, coupled with customer-centric service.


We are committed to partnering with our clients and delivering a superior level of service in every aspect of your project – from conception and collaboration, through construction.

With nearly 60 years of combined engineering experience, Cx4b can meet the needs of nearly any facility type. Our capabilities span a variety of spaces including office, retail, education, technology, residential, apartments, medical, restaurant, multi-family, banks, recreational, religious, hospitality, and industrial projects.

Along with commissioning, Cx4b works with clients, owners and contractors on major equipment replacements. We are equipped to assist in root cause and origin evaluations for instances of high humidity and mold growth.

In addition, because Cx4b prioritizes experience and relationships through their commitment to customer service, we have the connections necessary with various equipment vendors to provide you with the top-of-the-line, most economical solutions for all equipment replacements.

The Cx4b Commitment.

Established in 2013, Cx4b established a mission to provide our clients with engineering services that are customized, collaborative, current and transparent; and we are wholly committed to providing customer-centric service to each and every one.


The Cx4b Team.

We are a trusted and indispensable part of your project. With nearly 60 combined years in the world of engineering consulting, our highly educated engineers are here to deliver quality work that will exceed your expectations.

Donald H. Austin, Jr.
P.E., CxA, LEED AP, President/Owner

Mr. Donald Austin, Jr. has been working in the engineering industry for more than 40 years and has been the owner and president of Commissioning for Business – Cx4b – since 2013. Donald started as a mechanical engineer in 1977 and spent many of the last 40 years at senior management level. As the owner of Cx4b, Donald is focused on developing solid relationships with our clients. Donald is also responsible for the coordination and implementation of our projects.

Ryan C. Todaro
P.E., MRSA, Project Engineer

A graduate of Purdue University, Ryan Todaro is a registered professional engineer in the state of Florida with an 18 year history of diverse professional experience spanning many sectors. At Cx4b, Ryan applies this extensive experience to the design of heating, ventilation, and air conditioning (HVAC) systems and mechanical, electrical, and plumbing (MEP) systems. In addition, he is a licensed mold assessor in the state of Florida. Ryan is involved in Cx4b’s project management, mechanical design evaluation, and project scheduling.

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