Our Approach

Our Story

Tri-State Design and Development was founded in 1983 in Carnegie, PA as an Architectural/Engineering and Construction Management/Inspection corporation to provide services to public and private sector clients in the Western Region of Pennsylvania.
The firm is owned and managed by a Registered Professional Engineer and has been certified as a Disadvantaged Business Enterprise (MBE/DBE). The principal of the firm has over 46 years of proven records of broad base design, supervision, project management and administrative experience in the fields of Civil, Structural, Industrial, and Institutional works.
He is supported by three managers representing Transportation, Construction Inspection / Management, and Quality Management who have more than a combined 129 years of proven experience.
The administrative and management staff of Tri-State has the capabilities and comprehensive multidisciplinary resources required to offer the following services:


Our staff is comprised of highly educated, experienced, and dedicated professionals. The individuals of a project team are selected for their experience, ability to gain a complete understanding of project objectives, and records of achieving timely results while maintaining high professional standards. The unique diversity of experience that we possess allows us to undertake the task of complete consultancy – from preparing capital budgets through design, coordination, construction management and supervision.

The average experience of our key personnel is 25+ years. They are registered as engineers or architects in the states of Pennsylvania, West Virginia, Virginia, Ohio, Maryland, New York, and California.

We support and actively encourage participation in professional organizations. Our key personnel are currently members of the following organizations:

•    Consulting Engineering Council (CEC/PA and National)
•    American Society of Civil Engineers (ASCE)
•    American Society of Highway Engineers (ASHE)
•    Institute of Transportation Engineers (ITE)
•    Association of Bridge Construction and Design (ABCD)
•    Pennsylvania Association of Professional Land Surveyors (PA-PLS)

Tri-State Design stands alone as a certified DBE, providing multidiscipline engineering and construction management services in the fields of building design, transportation system design, and inspection.


We have achieved steady growth through total customer satisfaction. 
Our large number of repeat clients attests to this proven performance.


Tri-State Design and Development, Inc.

Key Administrative Management Staff


Hiroo K. Patel, P.E.,


Mr. Patel, P.E., is the founder and developer of Tri-State Design and Development and has grown the company since 1983 into the successful multi-tasked consultant design and inspection organization that exists today. Mr. Patel has over 50 years of diverse, broad-based design, inspection, supervision, and project administration experience. His design experience includes the design of structural steel, reinforced concrete and prestressed concrete structures for highways, metals industries, and chemical plants. His Transportation experience includes the design of various structure types from simple box culverts to multi-span, multi-girder structures, roadway, ROW, MPT and other services.




Mr. Hoffman, P.E., MBA, with 38 years of experience in transportation engineering, is responsible for business development, proposals, cost- control, invoicing, training, project development, and QA/QC. His engineering expertise covers highway design, construction phasing, signing and pavement marking, erosion control, NPDES permitting, maintenance and protection of traffic, airport design, and highway construction inspection for State DOT, County, and local government clients in Pennsylvania and West Virginia.