PS&S Purchases Stout & Caldwell Engineers

20-Year-Old Firm Brings New Civil Survey and Site Plan Strengths

Expands Capabilities in Southern N.J.

WARREN, N.J., April 1, 2024 — PS&S, a full-service architecture, engineering, design, surveying, and environmental firm with more than a 60-year history, today announced that it has purchased Stout & Caldwell Engineers, LLC, Cinnaminson, NJ, a civil engineering firm focused on residential and commercial real estate.

“Over the last 20 years, Bob Stout and Dan Caldwell have established themselves as the best in the business for civil survey and site plans with an impressive range of both residential and commercial projects,” said PS&S President and CEO John Sartor.  “The addition of the Stout & Caldwell team gives PS&S new breadth and depth in civil engineering, survey and site planning in South Jersey, as well as our greater geographical footprint.  We are thrilled to welcome Bob, Dan and their team to PS&S.”

On the residential side, Stout & Caldwell has served as the site and survey team for residential sub-divisions, including single family, multi-family and mixed-use communities for home-building clients such as Conifer Realty LLC and Lennar Corporation.

On the commercial side, since its inception in 2004, Stout & Caldwell has designed over 5.5 million square feet of commercial space, spanning Gloucester, Union, Burlington and Cape May counties. Projects include the design of retail power centers, corporate headquarters, educational facilities, churches and privately held projects.

Notable clients of Stout & Caldwell in the South / Southwestern NJ region include Lockheed Martin Corporation and The Michaels Organization. Most recently, the firm was responsible for a 1.5 million sq. ft. warehouse in Cinnaminson, NJ. 

“After two decades as a civil survey and site planning firm, we now look to the future as part of a top architecture and engineering firm that shares our commitment to delivering the absolute best to our clients,” said Dan Caldwell, Principal.  “This is a well-considered move for our team and the clients we serve – some of whom have been with us since we started.”

Including its principals, Stout & Caldwell will bring 15 new team members to PS&S in the areas of civil engineering and site survey.

“Corporate culture was an important consideration for us as we looked to take our firm to the next level,” said Robert R. Stout, PE, CME, LS, and Principal.  “We believe PS&S shares our work ethic and drive, which makes this a great fit for our team.”

“One of the objectives of our five-year strategic growth plan has been to increase PS&S’ in-house capability for survey,” said Sartor. “With the addition of Stout & Caldwell – through organic growth and acquisition – we have increased our headcount in survey by five-fold to 50 professionals all under the same umbrella.”

Concluded Sartor, “From a geographic standpoint, Stout & Caldwell is known as the ‘go-to’ firm for navigating the land use approval process in Southern Jersey, which is of tremendous benefit to us — and everyone in the greater community of residential and commercial real estate developers in our state.”

About PS&S

Founded in 1962, PS&S has evolved into a unique best-in-class architecture, engineering, surveying, and environmental consulting firm, providing design and consultation services to a wide range of public, corporate, institutional and commercial clients. PS&S is ranked among the top national design firms by Engineering News Record (and among the top 15 national engineering firms in pharmaceuticals). Recognized both for its breadth of services and depth of expertise, PS&S is the single source for planning, permitting and design at the local, State and Federal levels. To learn more, please visit

Media Contact:

Deborah Kostroun


Stout & Caldwell has joined the PS&S team.
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