Ahneman Kirby, LLC

Engineers, Land Surveyors

Fairfield County

Westchester County

About Us

Engineers and Surveyors

Fairfield County & Westchester County

Ahneman Kirby, LLC, formerly known as J.A. Kirby Co. (founded in 1871) is a full service civil engineering firm with specialized capability in buildings, bridge, highway, and construction services.  The firm maintains professional staff with expertise in the areas of GIS, hydraulics and hydrology, culvert and bridge analysis, design and inspection, construction, and civil engineering.  Complete services provided by the firm include project management; complex analysis, geometric assessment, and horizontal control considerations; conceptual/preliminary design; final design layout; site engineering; feasibility studies; and construction services including staking, field inspection/supervision, contract administration, as-built drawing preparation and quantity review.

Office Support and Facilities

Ahneman Kirby is headquartered in Greenwich with an office in Portchester, NY.  We provide complete office support for the preparation of technical reports, maps, plans, and engineering documents.  The office includes residential, commercial, municipal and CAD/drafting departments, reprographic facilities, a technical library and 3D facility.  Our CAD department uses the latest version of AutoCAD with documents produced on monochrome and color inkjet plotter, and high-speed HP printer.

The Company


Ahneman Kirby, LLC is the result of a merger between two outstanding firms and traditions:  Ahneman Associates started in 1988 by Edward and Thomas G. Ahneman in Greenwich, CT and J.A. Kirby Company started in 1871 by Joseph Andrew Kirby in Port Chester, New York.  Joseph Kirby’s  legacy includes the Boston Post Road (Rte.1) bridge that spans the Byram River at the “Gateway to New England” – the State of Connecticut Boundary.

J.A. Kirby’s surveys, sewer designs, road designs, and storm water designs shaped the Village of Port Chester at the end of the 19th century.  Many of his maps and designs are in use today and Ahneman Kirby, LLC is the proud steward of Kirby’s records, and continues the J. A. Kirby tradition of time tested civil engineering work. 

Ahneman Associates founders Ed, Jr. and Tom G. Ahneman are second and third generation civil engineers.  Edward Ahneman, Sr. was a civil engineer on the team that built the Kensico Dam in North White Plains, New York, the New York City water supply reservoirs, and was chief engineer overseeing the construction of New York City water supply aqueduct tunnels 5 and 5A which are still in use today. 

Principal, Thomas G. Ahneman, P.E. has extensive engineering experience in structural designs.  He obtained his B.S. in Civil Engineering from UCONN in 1981 focusing on structural and geotechnical disciplines.  He worked for a NYC consultant designing high rise structures while performing coursework toward a Master’s Degree at City College CUNY.  He joined his father in Greenwich, CT in 1985 to provide structural expertise to the firm.


 Ahneman Kirby is built on a foundation of three centuries of engineering, surveying, and land planning.  Knowledge, experience, tradition, and innovation are the underpinnings of our work.  Services include:

  • Civil and Structural Engineering, Site Analysis/Engineering Design, Permit Coordination, Facility Planning and Design,  Land Surveying, Waste Water Management, Public and Private Water Supply and Water Quality Mgt Planning, among others.

We serve our clients proudly with a reputation for reliability.  We have completed an extensive list of projects for our clientele in the tri-state area. Teamwork is the backbone of our organization.  Response and follow-up are our strengths.  We respond with a solution tailored to the client’s needs, be it design development or regulatory review. A family-oriented firm, we are a close-knit group of professionals who can rely on each other for support and assistance during the life of a project.  Most of our projects involve a team of people who individually bring expertise to the project through fieldwork, design, and oversight. Our clients receive personal attention in every project detail.  Every project is overseen by a licensed professional whose goal is to meet the client’s objectives in a timely and cost effective manner.Over the years, we have developed long-standing professional relationships with local municipalities, which allow us to present the client goals effectively in the review and approval process.  We encourage municipal interaction early in the design development stage.With our excellent working knowledge of the area (Westchester and Fairfield Counties) we can identify early on the accessory issues that often arise in land development projects.  We are the trusted advisor.  We get close to out clients.  We respect their needs and goals.  We are able to work closely with clients to negotiate a “best” result.We have a varied client base, serving private, public, and municipal clients.  Our diversity of experience brings creative solutions to both large and small projects. 


Civil Engineering

Structural Engineering

Land Surveying

Site Development

Stormwater Management

Planning and Urban Design

Sewage Treatment / Sanitary Sewer

Construction Management

Bridge / Highway

Wetlands and Environmental Resources

Our Clients

  • Albert, Ward & Johnson
  • Alisberg Parker Architects
  • All American Abstract
  • Allen Greenberg Architects
  • Allied Property Group
  • American Yacht Club
  • Antinozzi Associates
  • Arbor Abstract Corp.
  • Arconics, Inc.
  • Aurora Contractors, Inc.
  • Benedict Capital
  • Blind Brook Country Club
  • Boys & Girls Club of Greenwich
  • Bridgeport Realty Group
  • Brunswick School
  • C.J.Pagano & Sons
  • Caldwell & Walsh
  • Castle Title Insurance
  • Chimblo Construction
  • City of Rye - Recreation
  • Clay Arts Center
  • Coldwell Banker
  • Connecticut American
  • Connecticut Iron Worker
  • Conte & Conte
  • Cornerstone Contracting
  • Crozier Gedney Architects
  • Cuddy & Feder & Worby, LLP
  • Custom Title Services
  • David Mooney Architects
  • DeCaro Inc.
  • Department of Public Works
  • Dorcal Associates
  • Elm Street PartnersEpstein, Becker & Green
  • Fidelity National Title Insurance
  • First American Title Insurance
  • Family Centers Inc.
  • First Church of Round Hill
  • First Methodist Church
  • Fogarty, Cohen, Selby
  • Friends of Rye Town
  • Gatehouse Partners
  • GeoDesign, Inc.
  • Gilbride, Tusa, Last &
  • Gioffre & Gioffre
  • Grace Associates
  • Grbic Enterprises
  • Great American Development
  • Greenwich Country Club
  • Greenwich Harbor, LLC
  • Greenwich Land Co, Inc.
  • Greyrock Association
  • Grubb & Ellis
  • Town of Greenwich Dept. of Ed

  • Harvest Time
  • Heagney, Lennon and
  • Hilton - Vanderhorn
  • Hobbs Inc.
  • Hollows at Blue Hill
  • Homeland Development
  • Horsman & Lester
  • Hunting Ridge Motor Sports
  • Interstate Lumber
  • Interstate Septic Tank
  • Ivey, Barnum & O'Mara
  • J.S. Land Co.
  • J.W. Mays, Inc.
  • Jacques Murray &
  • James Doyle Design Assoc.
  • John B. Murray Architects
  • Judicial Title Insurance
  • Judy, Miller & O'Connor
  • Keane & Beane, P.C.
  • Khakum Wood Assoc.
  • Knights of Columbus
  • L&H Abstract Corp.
  • L&M Roofing Co.
  • Laurie R. Jones Architects
  • Lawyers Title Insurance
  • LeChateau Restaurant
  • Lejo Construction
  • Loftus Contracting Co.
  • Manursing Island Club
  • Mark Mariani Inc.
  • Mead, Bromley & Bishop
  • Merritt Associates
  • Metropolis Abstract, Corp.
  • Murphy Brothers
  • NewConn Developers
  • Nissan of Greenwich
  • North Castle Partners
  • North Mianus School
  • NPK Building Corporation
  • Old Greenwich Yacht Club
  • Paul F. Hopper Assoc.
  • Paul J. Santora & Son
  • Paul Marchese & Assoc.
  • Pearl River School District
  • Peckham Industries, Inc.
  • Pecora Brothers
  • Pike & Pike P.C.
  • Playland Park
  • Polo Pools
  • Post Road Iron Works
  • Purchase Friends Meeting
  • Putnam Indian Field School
  • R.M. Harris
  • Reliance Property Group
  • Riccardi Brothers
  • Ridberg Associates
  • Ridgewood Management
  • River Ridge Equestrian

  • Riverside Elementary
  • Roddy Construction
  • Rubino Brothers, Inc.
  • Rutherford Architects
  • Rye Ridge Tile
  • Scaping Falls Nursery
  • Scarsdale Village Fire
  • Shope Reno Wharton
  • Somerset Development
  • Soundview Properties
  • St. Michael Church
  • St. Roch's Church
  • St. Vincent's Hospital
  • Stamford Iron
  • Statewide Abstract Co.
  • Stepinac High School
  • Stewart Title Co.
  • STV Incorporated
  • Superior Abstract Corp.
  • Susan Lockwood Assoc.
  • Sutton Real Estate, LLC.
  • Taconic Builders, Inc.
  • The Rye Free Reading Room
  • Timothy D. Smith & Assoc.
  • Title Associates, Inc.
  • Tite Pro Agency, LLC.
  • Title Resource Agency
  • Town of Rye
  • Trc Raymond Keyes
  • Tri-Star Service Inc.
  • Updike, Kelly & Spellacy
  • Vaccaro Brothers Realty
  • Village of Port Chester
  • Village of Rye Brook
  • Wainright House
  • Wernet Associates
  • Westchester Playhouse
  • Weston & Sampson Engineers
  • Whitman Breed Abbott
  • Wormser, Kiely, Gales & Jacobs
  • WRNN
  • Wyrick & Associates
  • Xhema Custom Builders
  • YMCA of Greenwich
  • Yorktown Self Storage
  • Z Architects

Contact Us

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Email us at info@ahnemankirby.com

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Ahneman Kirby, LLC

1171 E Putnam Ave, Suite 1A, Riverside, Connecticut 06878, United States

Tel: (203) 869-7707


Monday - Friday: 8am - 5pm

Saturday: By appointment

Sunday: Closed