What John Turner Consulting does

John Turner Consulting (JTC), founded in 1997 by John Turner and headquartered in Portsmouth, New Hampshire, is a multi-discipline consulting engineering firm serving the New England region and adjacent New York. The firm delivers geotechnical engineering, environmental consulting, construction engineering and inspection, materials testing and laboratory services, special inspections, pavement management, building sciences, sustainability and energy services, and construction loan monitoring. Its client base is concentrated in the public and infrastructure sectors — state DOTs, transit authorities (MBTA), airports (Massport/Logan, Bradley International, Manchester-Boston), municipalities, VA Medical Centers, school districts, federal facilities (U.S. Army Mountain Warfare School), and private developers/construction firms (FedEx, Great Falls Construction).

The firm operates a fee-for-service professional services model, with quote-based, project-specific pricing that is not publicly disclosed. Go-to-market is direct enterprise field sales through a Business Development Director and department-specific service-line contacts, supported by a network of eight offices and seven AASHTO-accredited materials testing laboratories across New Hampshire, Massachusetts, Connecticut, Maine, and Vermont. Technical delivery relies on industry-standard, credential-driven methodologies (NETTCP, ACI, ICC, PCI, NICET certifications) and specialized techniques such as AASHTO T358 surface resistivity testing, Building Enclosure Commissioning, and ground-penetrating radar for non-destructive subsurface evaluation.

JTC has grown from a one-man operation to a $23M+ firm with 160+ technical professionals, including 70+ NETTCP-certified inspectors. Growth has been driven substantially by acquisition — Harper Environmental Associates (2022), Fessenden Geotechnical (Maine), Willis Consulting Engineers (Vermont), VHB's Pavement Management Group (Connecticut), and Optimum Testing (2025). In March 2025, JTC was acquired by UK-based Celnor Group, a testing, inspection, and compliance services company backed by private equity firm Inflexion, in Celnor's first international/U.S. acquisition; founder John Turner continues to lead JTC as President.

Name

John Turner Consulting

Legal name

John Turner Consulting, Inc.

Website

https://consultjtc.com

Company type

Private

Founded year

1997

Operating status

Operating

Headcount range

101–250 employees

Short description

John Turner Consulting is a New England-based multi-discipline consulting engineering firm providing geotechnical, environmental, materials testing, special inspection, and construction engineering services to state DOTs, municipalities, airports, healthcare, education, and private developers.

Ownership category

akta.pro rank

Product category

Engineering Consulting Services

NAICS

Engineering Services (54133), Testing Laboratories and Services (54138), Environmental Consulting Services (54162)

SIC

Services-Engineering Services (8711), Services-Testing Laboratories (8734)

akta.pro primary industry

Civil & Structural Engineering Consulting (BPAHAIAA)

akta.pro secondary industries

Asbestos/Lead/Mold Inspection, Testing & Consulting (BPALALAD), Site Assessment & Remediation (Phase I/II, Cleanup Oversight) (BPAHAJAC), Structural & Civil Inspection (Steel, Concrete, Foundations) (EUAEAHAI), Fire & Life Safety Code Compliance Inspections & Consulting (AHJ Support) (BPABAHAJ), Non-Destructive Testing (NDT) & Advanced Inspection (Phased Array, TOFD, Guided Wave) (EUAEAKAF)

Keywords

• Geotechnical engineering services
• Environmental consulting
• Construction materials testing
• Special inspections
• Pavement management consulting

Headquarters

HQ city

North Hampton

HQ country

United States

HQ region

North America

Offices8 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Professional Engineering & Consulting Services: Fee-for-service consulting model providing geotechnical engineering, environmental consulting, construction engineering and inspection services to government agencies, municipalities, and private sector clients on a project-by-project basis.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

John Turner Consulting (JTC) is a multi-discipline consulting engineering firm providing geotechnical engineering, environmental consulting, construction engineering and inspection, materials testing, special inspections, pavement management, building sciences (asbestos, lead, IAQ), sustainability and energy retrofit services, and construction loan monitoring. Services are delivered through eight offices and seven AASHTO-accredited materials testing laboratories across New England for government agencies, municipalities, transportation authorities, healthcare facilities, educational institutions, and private developers.

Product overview

John Turner Consulting (JTC) is a multi-discipline consulting firm founded in 1997 that provides geotechnical engineering, environmental consulting, construction materials testing, special inspections, pavement management, building sciences, sustainability services, and construction engineering and inspection across New England. The company operates as a unified service platform with specialized divisions, including its Harper Environmental Associates subsidiary acquired in 2022. JTC maintains eight offices and laboratories throughout New England and serves sectors including transportation, infrastructure, education, healthcare, and commercial development. In March 2025, JTC entered a strategic partnership with UK-based Celnor Group, expanding its compliance-driven testing and inspection services.

Differentiator

Problem solved

Functional benefit

Products and services

• Geotechnical Engineering Services Subsurface investigation, foundation analysis, and geotechnical engineering reports for construction, infrastructure, and development projects across New England states and New York, including site investigation, soil testing, slope stability assessment, and construction phase observation.
• Environmental Consulting Environmental site assessments, conceptual site models, geo-environmental analyses, risk assessment, remedial feasibility and design, remediation construction oversight, and federal/state regulatory compliance services including SWPPP, SPCC, and UST/AST management.
• Construction Engineering & Inspection Civil construction inspection services including project planning, budgeting, design procurement, construction contract administration, resident engineering, and construction oversight ensuring contractor compliance with design documents and permits.
• Material Testing & Laboratory Services Complete laboratory facilities in Dover, NH and Sutton, MA for testing and evaluation of concrete, asphalt, masonry, soils, fireproofing, and steel. Laboratories hold AASHTO accreditation, CCRL inspection, NETTCP certification, and USACE validation.
• Special Inspections Monitoring of materials and workmanship critical to building structural integrity, including structural steel welding/bolting, reinforced/prestressed concrete, structural masonry, firestopping, and technology-enhanced inspections using Ground-Penetrating Radar (GPR) and rebar locating.
• Pavement Management & Consulting Quality assurance and quality control services for engineers, state agencies, municipalities, and contractors, including visual evaluation, pavement forensics, AMRL-certified laboratory testing, and full project management from specifications to construction oversight.
• Building Sciences Hazardous materials management including asbestos surveys, asbestos project monitoring, lead sampling, indoor air quality/mold assessments, noise monitoring, O&M plans, OSHA compliance, and dust monitoring for federal and state regulations.
• Sustainability & Energy Services Turn-key energy efficiency solutions including LED retrofits, lighting controls, HVAC retrofits (ECMs, VFDs, controls), refrigeration retrofits, thermal envelope and air barrier installation, and blower door testing for commercial, industrial, and municipal buildings.
• Construction Loan Monitoring Construction loan assessment and monitoring services including preconstruction reviews, onsite draw inspections, schedule and documentation review, financial tracking, lien waiver tracking, and project close-out to protect lender interests throughout construction.
• Training & Presentations Professional training for the AEC industry including CE credits on topics such as asbestos awareness, geotechnical engineering insights, materials testing, firestopping, energy efficiency, lead safety, and FAA P-401 asphalt pavement specifications.
• Harper Environmental Associates Services A Vermont-based division of JTC providing petroleum/hazardous material spill response, investigation and remediation of contaminated sites, Phase I and II Environmental Site Assessments, fuel storage tank removals, asbestos sampling and abatement, and mold investigations.

Quantifiable outcome

• Over 25 years of successful project delivery across New England
• +2 more outcomes

Named customers13 records

Segments6 records

Ideal customer profiles6 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.

• Celnor GroupcoreStrategic or Co-development Partner · 13 March 2025JTC has officially joined forces with Celnor Group, a UK-based leader in testing, inspection, and compliance services. This strategic partnership represents JTC's first major alliance since founding in 1997. Celnor, backed by Inflexion, is expanding into the US market. Founder John Turner will continue leading JTC as President. The partnership is designed to accelerate growth and expand service capabilities while maintaining JTC's existing operations and client relationships.

Scale indicators6 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• ECS Group of Companies: National geotechnical, environmental, construction materials and facilities engineering firm. Directly comparable service lines to JTC but operates across the entire US rather than regionally.
• WSP USA: Global professional services firm with a large US transportation, environment and earth/water practice. Competes with JTC on DOT, transit and airport projects in New England but as part of a much broader portfolio.
• Terracon Consultants: Large US consulting firm offering geotechnical, environmental, construction materials and facilities services. National footprint with the same testing/inspection value proposition as JTC, but at much greater scale.
• Kleinfelder: National engineering, architecture and science consulting firm with strong geotechnical, environmental, materials testing and inspection practices. Significantly larger than JTC but offers the same core service lines to public-sector clients.
• AECOM: Global infrastructure consulting firm with deep transportation, environment and construction services practices in the Northeast. Competes for the same DOT, transit and aviation contracts but at materially greater scale and capital capacity.

Direct peers

• Weston & Sampson: Regional engineering, environmental and construction services firm serving municipal, state, federal and private clients across the Northeast. Similar service mix, customer base and geographic footprint to JTC.
• Tighe & Bond: New England-based engineering and environmental consulting firm providing geotechnical, site/civil, water resources, environmental and construction services to municipalities, DOTs and private clients. Direct comparable in regional focus and service breadth.
• GZA GeoEnvironmental: New England-based multi-discipline engineering and environmental consulting firm offering geotechnical, environmental, construction management and ecological services. Closest direct peer in geography, service mix and customer base to JTC.
• Sanborn Head: New England-focused geotechnical, environmental and materials testing firm serving transportation, energy, institutional and private development clients. Comparable size, service scope and regional customer base to JTC.

Emerging players

• SLR Consulting: International environmental, advisory and engineering consultancy with a growing US footprint in environmental and sustainability services. Adjacent competitor in environmental consulting and increasingly in TIC, especially since SLR's own PE-backed acquisition strategy mirrors Celnor's.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/JohnTurnerConsulting
• LinkedInlinkedin.com/company/john-turner-consulting-inc
• Instagraminstagram.com/jtceng1
• Xx.com/jtceng1

Compliance10 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles11 records

Subsidiaries5 records

Funding overview

Funding rounds

Investors

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

M&A1 record

Investments

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

Frequently asked questions about John Turner Consulting