Alter Consulting Engineers consists of a team of low energy HVAC and plumbing design experts. With a combined 25 years experience, we are well-versed to tackle projects of a wide variety of scales and scopes.


Together we have experience specializing in the design of Zero Net Energy buildings, as well as LEED, and other high performing buildings. With a long history of working in the state of California, our team is well-versed in Title 24 and CalGreen requirements. We have comprehensive experience in design drawing creation as well as design-build handoffs. Our team has a special focus in energy modeling, which is extensively used in all parts of the design process to ensure our designs feature optimized efficiency. 

Shannon Allison

Shannon has worked for over eleven years in the building industry, most recently as a project manager and team leader at Integral Group.

Shannon's background in architectural engineering enables her to incorporate a holistic approach to mechanical engineering. This comprehensive perspective allows her to seamlessly integrate the various disciplines throughout the project's life span. 

Shannon's experience crosses multiple sectors, from residential
through civic and corporate; however, one common thread ties this together: a commitment to sustainability and the design excellence, which has resulted in several LEED Platinum and Net Zero Energy certifications.

Shannon has since co-founded Alter Consulting Engineers in 2018. Shannon intends to use her passion for and extensive experience in sustainable building design to help influence the building industry. 

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Stefan Gracik

Stefan has worked for over six years as a building energy consultant and researcher.

As a Building Performance Engineer, Stefan performed a variety of roles focused on supporting the design of energy efficient buildings through energy modeling, consulting directly to other engineers, utilities, and architects, as well as assuming a leadership role. He acted as project manager and technical lead for nine energy code proposals written under PG&E's Codes and Standards Enhancement program in preparation for the 2019 Title 24, Part 6 Energy Code update.

At AlterCE, Stefan intends to use his knowledge and passion for energy efficiency to focus on building energy codes, and to further provide low energy engineering services to a variety of construction projects.


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Matt Dehghani

For nearly a decade Matt has worked as a consulting engineer for the nation’s most progressive, high-performance, MEP building design firms. Matt has excelled as a design engineer, serving as lead mechanical engineer for numerous high capital projects.


As a mechanical engineer, Matt was a leader in low energy HVAC design, and received first-hand experience designing and implementing low energy HVAC system. He worked with architects to optimize building envelopes (reducing heating and cooling requirements); contractors to control cost / ensure proper implementation of low energy systems; and mentored many young engineers.


At AlterCE Matt leverage his experience designing and consulting low energy / low cost building systems to accelerate the industry towards a sustainable future. 


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