What Oltmans Construction Co. does

Oltmans Construction Co. is a privately held, family-controlled full-service general contractor founded in 1932 and headquartered in Whittier, California. The firm delivers ground-up construction, renovation, seismic retrofits, and tenant improvements for commercial, industrial, e-commerce, healthcare, private education, infrastructure, and sustainability projects across the Southwestern United States. It operates from four locations (Whittier HQ; Modesto for Northern California; Henderson, Nevada; and Corona for the Inland Empire), serving a diversified enterprise roster that includes Goodman Group, Trammell Crow / Clarion Partners, Samsung, Sprouts Farmers Market, Bandai Namco, Rexford Industrial, Glenair, Haas Automation, Salvation Army, and Mind OC.

The company's core technical platform is its self-perform structural concrete division, OCCO Concrete, which has been a Carpenters Southwest union signatory since the 1940s. OCCO employs 350-400 union carpenters in the field and pours 12-15 million square feet of tilt-up and poured-in-place concrete annually, making it one of the largest concrete contractors in the Southwestern US. Quality control relies on total station surveying and laser screeding to deliver strict floor flatness and floor levelness (FF&FL) tolerances, and the team has executed proprietary E-shaped corner-panel designs on projects such as the Goodman Logistics Center. Oltmans has also invested in low-embodied carbon concrete mixes (LC3 Cement, LC3 + Slag, Type 1L, and Vertua) via a partnership with National Ready Mix, having placed over 103,487 cubic yards across more than 1.4 million square feet of commercial warehouse space and supporting LEED and BREEAM project certifications.

Revenue is generated through project-specific general contracting contracts under fixed-bid and negotiated arrangements, with bonding capacity up to $150 million per single project. Sales channels are predominantly direct enterprise engagement through an internal business development team that leverages long-tenured relationships, several of which span 50+ years. The firm recorded $955 million in construction volume in 2023 under then-CEO John Gormly, its largest year on record, and ranks #194 on ENR's 2024 Top 400 Contractors, #78 on ENR's Top 100 Design-Build list, and #5 on the LA Times' largest general contractors list. The company remains privately held under third-generation family leadership, with Charlie Roy succeeding John Gormly as Chairman of the Board in April 2025.

Name

Oltmans Construction Co.

Legal name

Oltmans Construction Co.

Website

https://oltmans.com

Company type

Private

Founded year

1932

Operating status

Operating

Headcount range

251–500 employees

Short description

Oltmans Construction Co. is a privately held, family-controlled general contractor founded in 1932, delivering commercial, industrial, healthcare, education, infrastructure, and sustainability projects across the Southwestern US through a self-perform tilt-up concrete division (OCCO) and full preconstruction-to-completion services.

Ownership category

akta.pro rank

Product category

Commercial Construction Services

NAICS

Nonresidential Building Construction (2362), Poured Concrete Foundation and Structure Contractors (23811), Other Heavy and Civil Engineering Construction (237990)

SIC

General Bldg Contractors - Nonresidential Bldgs (1540), Operative Builders (1531), Construction - Special Trade Contractors (1700)

akta.pro primary industry

Self-Performing General Contractors (IMAFAAAI)

akta.pro secondary industries

Modular/Offsite General Contracting & Installation (IMAFAAAK), Piling & Deep Foundations (Driven, Bored, CFA, Micropiles) (IMAFAOAA)

Keywords

• Commercial general contracting
• Industrial construction services
• Tilt-up concrete construction
• Preconstruction and project management
• Tenant improvement services

Headquarters

HQ city

Whittier

HQ country

United States

HQ region

North America

Offices4 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. General Construction Contracting: Full-service general contracting services including preconstruction, construction, project management, and concrete self-perform services for commercial, industrial, healthcare, education, and infrastructure projects.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Oltmans Construction Co. is a full-service general contractor delivering preconstruction, construction, and project management services for commercial, industrial, e-commerce, outpatient healthcare, private education, infrastructure, sustainability, and tenant improvement projects across the Southwestern United States. The company self-performs tilt-up and poured-in-place structural concrete through its OCCO Concrete division, which employs 350+ union carpenters and pours 12-15 million square feet of tilt-up projects annually.

Product overview

Oltmans Construction Co. is a full-service general contracting company offering a comprehensive portfolio of construction services and specialized self-perform capabilities across the Southwestern United States. The company's service offerings are organized around core construction disciplines including preconstruction, construction management, and project management, complemented by a proprietary concrete self-perform division branded as OCCO Concrete. The company specializes across diverse market sectors spanning commercial, industrial, e-commerce, outpatient healthcare, private education, sustainability, infrastructure, and tenant improvement construction, delivering projects from ground-up development through tenant improvements and adaptive reuse. Notable project categories include Community & Public Works, Climate Controlled facilities, Housing, Infrastructure, Healthcare, Office, Private Education, Science & Technology, Sustainability, Warehouse & Distribution, and Market Ready TI. The company's project portfolio includes notable developments across industrial/logistics, healthcare, education, and community facilities, with demonstrated expertise in sustainable construction practices including LEED and BREEAM certification work and low-carbon concrete applications.

Differentiator

Problem solved

Functional benefit

Brands

• OCCO Concrete: Oltmans' structural concrete division established in the 1940s, specializing in self-perform tilt-up concrete construction and low-embodied carbon concrete placement.

Products and services

• Preconstruction Services Early-phase project expertise provided to help owners navigate complexity through fair and transparent business practices, including budgeting, constructability reviews, value engineering, and permit coordination, for commercial, industrial, healthcare, education, and infrastructure projects across the Southwest US.
• Construction Services Full-spectrum construction delivery spanning ground-up construction, renovation and repositioning, seismic retrofits, and tenant improvements throughout the Southwest United States, with field supervision teams averaging 25 years of construction experience.
• Project Management Dedicated project management service emphasizing consistency of construction teams once assigned, deployment of innovative technologies, and collaborative tools to foster trust and communication for successful project delivery.
• OCCO Concrete (Self-Perform Concrete Operations) Oltmans' proprietary structural concrete division providing self-perform tilt-up and poured-in-place concrete services. The division employs over 350 carpenters and completes approximately 10-15 million square feet of tilt-up projects annually, making it one of the largest concrete contractors in the Southwestern United States and one of the only self-perform tilt-up contractors in California.
• Sustainability Services Sustainable construction methodologies including low-embodied carbon concrete mixes, LEED certification pursuit, and alternative ready-mix implementations to reduce environmental impact across commercial warehouse, healthcare, and industrial projects.
• Tenant Improvement Targeted refresh and transformational tenant improvement services including targeted refreshes, full overhauls, historic structure repositioning, seismic retrofits, and safety upgrades for commercial landlords and tenants in occupied buildings, with over 30 years of experience.
• Market Ready TI Move-in-ready tenant improvement solutions designed to create polished, strategic spaces that attract tenants efficiently for landlords and building owners.
• Safety Services Comprehensive safety program development and implementation including safety pilot programs and third-party safety certification compliance, supporting clients with current safety mandate requirements on commercial and industrial construction projects.

Quantifiable outcome

• Completed 2023 with largest construction volume in company history at $955 million under CEO John Gormly's leadership
• +3 more outcomes

Named customers15 records

Segments6 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Five partnerships are on record, tiered core, major and minor.

• National Ready MixcoreStrategic or Co-development Partner · 3 November 2025Partnership with National Ready Mix to trial and implement low-embodied carbon concrete mixes including LC3 Cement, LC3 + Slag, Type 1L, and Type 1L + Slag. Successfully placed over 103,487 cubic yards demonstrating sustainable concrete technologies in real-world construction applications.
• Boulder & Associates, Inc.coreStrategic or Co-development PartnerArchitecture and design firm responsible for designing the Be Well OC Irvine behavioral health campus - a 22-acre campus with three LEED-certified facilities totaling 74,800 s.f.
• DBaC Inc.majorImplementation/ SI/ Consulting PartnerTenant improvement general contractor collaborating with Oltmans on Be Well Campus Phase I construction, sharing construction responsibilities for the behavioral health campus on former Marine Corps Air Station El Toro site.
• CalCommmajorImplementation/ SI/ Consulting PartnerConstruction management firm coordinating protection of active monitoring wells on the former military installation site during Be Well Campus development.
• FourPoint ConstructionminorImplementation/ SI/ Consulting PartnerInfrastructure construction firm leading parallel infrastructure improvements at Be Well Campus site requiring inter-agency collaboration.

Scale indicators11 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Swinerton: West Coast-based general contractor of comparable scale operating across commercial, industrial, healthcare, and education sectors with self-perform concrete and interior capabilities. Directly comparable in service mix, geographic overlap in California/Nevada, and project size band.
• McCarthy Building Companies: Large employee-owned general contractor with self-perform concrete expertise serving commercial, industrial, healthcare, and education markets across the Western US. Highly comparable in scale (~ billion revenue band), self-perform model, and vertical mix.
• DPR Construction: National technical general contractor with strong West Coast presence, self-perform capabilities, and significant industrial, healthcare, and education portfolios. Comparable in self-perform culture, sustainability focus, and complex project delivery.

Regional players

• Hathaway Dinwiddie Construction: California-focused commercial general contractor with comparable project size band serving tech, healthcare, and office markets in the Bay Area and Southern California. Comparable in regional concentration but more concentrated in office/tech buildouts.
• Webcor: California-based general contractor with self-perform concrete and a comparable mix of commercial, healthcare, education, and civic projects. Comparable in scale and regional focus though more concentrated in Northern California.

Emerging players

• BNBuilders: West Coast general contractor focused on healthcare, life sciences, and education with self-perform capabilities. Comparable in vertical mix and self-perform culture but at a smaller revenue scale.

Broad incumbents

• Turner Construction: Largest US general contractor with national footprint and broad commercial, industrial, healthcare, and education portfolio. Competitor on mega-campus bids and benchmark for ENR Top 400 ranking.
• Clark Construction Group: National general contractor with strong West Coast presence in commercial, industrial, and infrastructure. Comparable on large industrial campus and design-build projects.
• AECOM Hunt: National construction manager/general contractor with significant industrial, commercial, and aviation portfolio. Comparable on large-scale industrial and design-build pursuits.
• Skanska USA: Global general contractor with US West Coast operations and a heavy industrial/civil/infrastructure portfolio. Comparable on large campus projects and sustainability-focused builds.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/oltmansconstruction
• LinkedInlinkedin.com/company/871266
• Instagraminstagram.com/oltmans
• Xx.com/oltmansconstco

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 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 Oltmans Construction Co.