Illingworth & Rodkin

What Illingworth & Rodkin does

Illingworth & Rodkin, Inc. is a privately held engineering consulting firm founded in 1987 and headquartered in Cotati, California. The firm specializes in acoustical engineering and air quality management, with over 6,000 proprietary studies conducted across community noise, vibration, industrial noise, vibration control, architectural acoustics, and air quality. It maintains a team of 1-10 employees and delivers expert consulting services nationwide in the United States.

The company's service portfolio spans six core disciplines: environmental noise management, transportation noise management, architectural acoustics, industrial noise management, air quality control and management, and marine acoustics (hydroacoustics), complemented by specialized offerings in community noise studies and vibration control. Its methodology combines a strong theoretical approach with thorough empirical work, producing regulatory-grade assessments for both public sector agencies and private sector clients across industries.

The business operates on a professional services revenue model, generating income through project-based consulting engagements. Pricing is not publicly disclosed and is presumed to be quote-based given the specialized, project-specific nature of the work. Go-to-market is sales-led and direct: clients engage the firm via phone (707.794.0400) or email ([email protected]) from the single Cotati headquarters, with services delivered nationwide. The firm carries no external funding, no subsidiaries, no disclosed ownership structure, and no public-facing social profiles beyond its corporate website and careers page.

Name

Illingworth & Rodkin

Legal name

Illingworth & Rodkin, Inc.

Website

https://iandrinc.com

Company type

Private

Founded year

1987

Operating status

Operating

Headcount range

1–10 employees

Short description

Illingworth & Rodkin is a privately held engineering consulting firm founded in 1987 in Cotati, California, specializing in acoustical engineering and air quality management services for public and private sector clients nationwide in the United States.

Ownership category

akta.pro rank

Product category

Acoustical Engineering Consulting

NAICS

Environmental Consulting Services (541620), Other Scientific and Technical Consulting Services (54169)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

EHS Auditing, Inspections & Assurance (BPAHAJAG)

akta.pro secondary industry

EHS Management Systems & ISO Consulting (ISO 14001/45001) (BPAHAJAF)

Keywords

• Acoustical engineering consulting
• Air quality management
• Environmental noise assessments
• Architectural acoustics services
• Vibration control consulting

Headquarters

HQ city

Cotati

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Engineering Consulting Services: Professional consulting services in acoustical engineering and air quality management provided to public and private sector clients. Revenue is generated through consulting engagements, studies, and expert advisory services. As a consulting firm established since 1987, services are delivered on a project basis to clients requiring specialized noise and air quality assessments.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Illingworth & Rodkin, Inc. is an engineering consulting firm that provides expert acoustical engineering and air quality management services. Since 1987, the firm has conducted over 6,000 proprietary studies covering community noise, vibration, industrial noise, vibration control, architectural acoustics, and air quality. Services are delivered nationwide to public and private sector clients through project-based consulting engagements.

Product overview

Illingworth & Rodkin, Inc. is an engineering consulting firm offering a unified portfolio of acoustical engineering and air quality management services since 1987. The company provides expert consulting nationwide through its core service lines: Environmental Noise Management, Transportation Noise Management, Architectural Acoustics, Industrial Noise Management, Air Quality Control and Management, and Marine Acoustics (hydroacoustics). These services are complemented by specialized offerings including community noise studies and vibration control assessments. With over 6,000 proprietary studies conducted, the firm serves both public and private sector clients, combining theoretical and empirical approaches to solve complex noise and air quality challenges.

Differentiator

Problem solved

Functional benefit

Products and services

• Environmental Noise Management

Quantifiable outcome

• Over 6,000 proprietary studies conducted since 1987

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Scale indicators3 records

Recent moves3 records

Expansion highlights3 records

Direct peers

• Acentech: Acoustics, noise, and vibration consulting firm that competes for similar architectural, environmental, and transportation acoustics engagements, with comparable size and consulting model.
• Jaffe Holden: Acoustics and audio-visual design consultancy competing in architectural acoustics, noise control, and vibration — addressing the same building, infrastructure, and environmental client base.
• Wilson Ihrig: Acoustical engineering and air quality consulting firm with a service mix (noise, vibration, air quality) that closely mirrors Illingworth & Rodkin's portfolio, serving public infrastructure and industrial clients in the U.S.
• Cavanaugh Tocci Associates: Acoustical consulting firm providing noise and vibration services to architects, building owners, and industrial clients — directly overlapping with Illingworth & Rodkin's architectural and industrial acoustics practices.
• BRC Acoustics: Acoustical engineering firm offering noise and vibration consulting across architectural, environmental, and industrial applications — directly comparable specialty consultancy.
• Veneklasen Associates: Acoustical engineering consultancy specializing in architectural acoustics, environmental noise, and vibration — comparable boutique competitor in the same U.S. acoustics consulting niche.

Broad incumbents

• AECOM: Global engineering and environmental services firm that offers acoustics and air quality consulting as part of a much broader infrastructure and environmental portfolio, often competing on large transportation and environmental impact projects.
• Trinity Consultants: Environmental and air quality consulting firm specializing in regulatory compliance, permitting, and EHS advisory — overlapping most directly with Illingworth & Rodkin's air quality practice.
• WSP: Large professional services firm with environmental, acoustics, and air quality capabilities acquired through multiple consulting platforms; competes for transportation and environmental assessment mandates.
• SLR Consulting: Global environmental and advisory firm providing air quality, noise, and sustainability services — adjacent competitor on industrial and infrastructure environmental mandates.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• Xx.com/iandrinc

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Illingworth & Rodkin