Siefert Associates

What Siefert Associates does

Siefert Associates, LLC is a U.S. construction engineering firm founded in June 2000 by Vincent Siefert in Watertown, Connecticut. The company specializes in construction engineering — the process of determining and designing the most efficient means and methods used to execute large-scale construction projects — and serves as a specialized subconsultant to general contractors and public infrastructure owners. Its core service portfolio comprises six interrelated disciplines: Structural Engineering, Demolition Engineering, Erection Engineering, Geotechnical Engineering, Accelerated Bridge Construction Engineering, and Heavy Lift and Rigging Engineering, supplemented by Additional Engineering Services that include staff augmentation, value engineering, field inspections, forensic investigation, and third-party peer review. The firm uses state-of-the-art structural modeling, CAD tools, and geotechnical software to produce contractor-friendly working drawings, supporting calculations, and advanced modeling tailored to project schedule, budget, and site conditions.

The firm operates from two office locations — Watertown, CT (headquarters) and White Plains, NY (regional office serving the NYC-metro area and broader Northeast) — and holds Professional Engineer licensure in 17 states and territories spanning the Northeast, Mid-Atlantic, Midwest, and Florida. Its project portfolio includes marquee U.S. and Canadian infrastructure engagements such as the raising of the Bayonne Bridge, work at the World Trade Center, the Tappan Zee Bridge, the Gordie Howe International Bridge, the Long Island Rail Road Expansion Project, LaGuardia Terminal B, Newark Liberty Terminal A, and the Green Line Extension. Customers are predominantly state departments of transportation, port authorities, transit authorities, and municipal transportation agencies, with general contractors as the primary contracting channel. Revenue is generated on a project-based professional services basis with quote-based, scope-specific pricing.

In 2021, GZA purchased the assets of Siefert Associates and the firm's employees transitioned to GZA; the Siefert brand continues to operate under GZA ownership. Founder Vincent Siefert previously spent 13 years working for contractors (including Kiewit Eastern, Walsh Construction, Moretrench America, and Tomasso Construction) achieving the rank of General Superintendent, and the leadership team collectively brings over 150 years of hands-on field experience as Engineers, Superintendents, and Project Managers. The firm's go-to-market is enterprise field sales: direct engagement with contractors and government transportation owners, with business development driven by reputation, prior project relationships, and reference-ability rather than paid marketing channels.

Name

Siefert Associates

Legal name

Siefert Associates, LLC

Website

https://siefertassociates.com

Company type

Private

Founded year

2000

Operating status

Acquired

Headcount range

11–50 employees

Short description

Siefert Associates is a U.S. construction engineering firm that designs means and methods for large-scale infrastructure projects. It serves general contractors and government transportation agencies with structural, demolition, erection, geotechnical, accelerated bridge construction, and heavy lift engineering services.

Ownership category

akta.pro rank

Product category

Construction Engineering Services

NAICS

Engineering Services (541330), Engineering Services (54133)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Construction Engineering & Constructability Consulting (BPAHAIAN)

akta.pro secondary industry

Systems Engineering & Technical Program Management (BPAHAIAI)

Keywords

• Construction engineering
• Structural engineering services
• Heavy lift rigging
• Accelerated bridge construction
• Demolition engineering

Headquarters

HQ city

Watertown

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales

Revenue model

1. Engineering Services: Project-based professional services revenue from providing construction engineering, structural engineering, demolition engineering, erection engineering, geotechnical engineering, accelerated bridge construction, and heavy lift and rigging engineering services to contractors and government agencies on large-scale infrastructure projects.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Siefert Associates is a construction engineering firm that designs the means and methods for large-scale infrastructure projects, producing working drawings, supporting calculations, and advanced modeling for structural, demolition, erection, geotechnical, accelerated bridge construction, and heavy lift and rigging engineering. The firm delivers these engineering services on a project basis to contractors and government transportation agencies across North America, using CAD, structural modeling, and geotechnical software to ensure structural adequacy through all phases of each project.

Product overview

Siefert Associates is a construction engineering firm offering a unified portfolio of specialized engineering services. The core offerings include Structural Engineering, Demolition Engineering, Erection Engineering, Geotechnical Engineering, Accelerated Bridge Construction Engineering, and Heavy Lift and Rigging Engineering. These services are complemented by Additional Engineering Services that provide staff augmentation, peer review, and field support. The firm produces high-quality working drawings, supporting calculations, and advanced modeling tailored to each project's schedule, budget, site conditions, and client preferences for large-scale infrastructure projects.

Differentiator

Problem solved

Functional benefit

Products and services

• Structural Engineering Designs and analyzes custom structures and temporary works for projects ranging from challenging to complex, utilizing state-of-the-art structural modeling and CAD tools to assure structural adequacy during all phases of each project. Serves construction contractors and government transportation agencies on large-scale infrastructure projects.
• Demolition Engineering Plans and engineers detailed demolition procedures that account for all intermediate stages of demolition, equipment loads imposed, and temporary support and bracing requirements for structures that may have deteriorated over years of weathering and abuse, primarily for bridge and infrastructure demolition projects.
• Erection Engineering Prepares comprehensive staged erection analyses, designs temporary supports and bracing where required, includes provisions for elevation control and structural fit, and collaborates with erectors and fabricators to ensure successful field operations.
• Geotechnical Engineering Offers a wide variety of geotechnical engineering services in support of both temporary and permanent structures, using the latest geotechnical software to develop best-fit solutions based on accurate geotechnical design parameters.
• Accelerated Bridge Construction Engineering Provides lateral slide and Self-Propelled Modular Transporter (SPMT) projects as well as projects utilizing precast/prefabricated elements, enabling clients to accomplish major work in compressed time windows to minimize disruptions.
• Heavy Lift and Rigging Engineering Prepares heavy lift plans combining extensive knowledge of equipment and means and methods with state-of-the-art analysis and rigging design to safely move the heaviest and most geometrically complex loads into position.
• Additional Engineering Services Comprehensive support services spanning engineering, drafting, third-party peer review, and education including on-site engineering, staff augmentation, value engineering, on-site drafting, field inspections, forensic investigation, and regulatory agency filings.

Quantifiable outcome

• Successful lifts across several decades demonstrating heavy lift planning expertise
• +1 more outcomes

Named customers8 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature3 records

Partnerships

One partnership is on record.

• GZAmajorStrategic or Co-development PartnerGZA has purchased assets of Siefert Associates and Siefert Associates' employees have joined GZA. This represents a significant business combination in the construction engineering space, combining Siefert's specialized construction engineering expertise with GZA's broader geotechnical and environmental engineering capabilities.

Scale indicators4 records

Recent moves7 records

Expansion highlights4 records

Broad incumbents

• GZA GeoEnvironmental: Multi-discipline engineering firm specializing in geotechnical, environmental, and construction services. Acquirer of Siefert Associates' assets in 2021, providing integrated engineering capabilities across the Northeast and nationally.
• Parsons Corporation: Large defense and infrastructure engineering firm offering construction engineering, program management, and design services to transportation agencies. Broad incumbent with overlap in Siefert's DOT and transit agency client base.
• AECOM: Global infrastructure consulting firm with extensive transportation and bridge engineering practices. Competes for large public-sector infrastructure contracts that overlap with Siefert's addressable market.
• WSP USA: International engineering consultancy with significant US transportation and bridge engineering operations. Overlaps with Siefert in serving state DOTs and providing construction engineering services on major projects.
• Jacobs Engineering: Large global engineering and program management firm serving transportation, water, and infrastructure clients. Adjacent incumbent with similar public-sector client mix and infrastructure project work.
• Stantec: North American engineering consultancy with broad transportation and infrastructure practices. Competes for similar DOT and bridge rehabilitation projects, particularly in the Northeast.

Direct peers

• Thornton Tomasetti: Global engineering consultancy with strong structural and construction engineering practices serving complex infrastructure and building projects. Highly comparable in providing means-and-methods, demolition, and erection engineering on marquee bridge and infrastructure jobs.
• Collins Engineers: Specialist engineering firm focused on bridge inspection, rehabilitation, and underwater inspection. Comparable niche focus on bridge and transportation infrastructure engineering services to public agencies.
• Hardesty & Hanover: Engineering consultancy with deep expertise in movable bridges, highway structures, and complex transportation infrastructure. Directly comparable in serving state DOTs and port authorities on bridge design and rehabilitation.
• Modjeski and Masters: Specialty bridge engineering firm with deep expertise in bridge design, inspection, and rehabilitation. Comparable in serving transportation agencies on complex bridge and infrastructure projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/SiefertAssociates
• LinkedInlinkedin.com/company/siefert-associates-llc

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Siefert Associates