What Sully-Miller Contracting Co. does

Sully-Miller Contracting Co. is a vertically integrated heavy civil general contractor headquartered in Brea, California, founded in 1923 and operating as a wholly-owned subsidiary of France-based Colas Group (itself majority-owned by Bouygues S.A.). The company executes infrastructure projects across Southern California for government clients, serving state (Caltrans), county transportation authorities, municipal public works, airport authorities (LAX, Ontario, Long Beach, Burbank, John Wayne), seaport operators (Port of LA, Port of Long Beach), and rail/intermodal operators (BNSF). Its core operations span three integrated divisions: Sully-Miller Contracting performs general contracting services including grading, underground utilities, asphalt and concrete paving, concrete structures, traffic control, and quality control; United Rock Products supplies aggregates (natural and crushed gravel, sand, road base, premix blends, recycled concrete and asphalt) and inert fill reclamation; Blue Diamond Materials produces hot-mix asphalt, warm-mix (EcoMat), rubber hot-mix, perpetual pavement, cold mix, and SuperPave mixes from six plants at five locations, all NAPA Diamond Achievement and Diamond Quality commended. The company self-performs over 50% of contract work and operates an on-site AASHTO-accredited quality control laboratory, enabling single-source project delivery.

The business model is project-based, generating revenue through competitive bidding on public infrastructure contracts and through unit-priced materials sales from plant locations. Pricing is not publicly disclosed; aggregate and asphalt products are sold via quote-based direct sales while contracting work is won via multi-year competitive procurements. The firm is ranked in ENR's Top 50 Domestic Heavy Contractors and Top 20 in Transportation, has completed 40+ airport projects in the last decade, and carries an Outstanding EMR for safety. Distribution is entirely direct: no resellers or distributors are used, with sales executed through a dedicated estimating department, a Request A Quote website channel, and plant-based materials dispatch across LA, Orange, Riverside, San Bernardino, and Ventura counties. The company employs between 251 and 500 people, with average employee tenure measured in decades across its operating divisions, and benefits from Colas Group's global technical and financial resources.

Name

Sully-Miller Contracting Co.

Legal name

Sully Miller Contracting Company

Website

https://sully-miller.com

Company type

Private

Founded year

1923

Operating status

Operating

Headcount range

251–500 employees

Short description

Sully-Miller Contracting Co. is a vertically integrated heavy civil general contractor serving Southern California government agencies, airports, seaports, and rail operators, combining self-performed construction with in-house aggregate (United Rock Products) and asphalt (Blue Diamond Materials) supply under Colas Group ownership.

Ownership category

akta.pro rank

Product category

Heavy Civil Construction Services

NAICS

Site Preparation Contractors (23891), Asphalt Paving, Roofing, and Saturated Materials Manufacturing (32412)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600)

akta.pro primary industry

Industrial/Process Plant General Contracting (IMAFAAAH)

Keywords

• Heavy civil construction
• Asphalt pavement manufacturing
• Aggregate materials supply
• Highway infrastructure construction
• Airport runway construction

Headquarters

HQ city

Brea

HQ country

United States

HQ region

North America

Offices7 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Supply Chain, Infrastructure, Operations, Others

Revenue model

1. Heavy Civil Construction Services: General contracting for infrastructure projects including roads, highways, airports, seaports, rail facilities. Revenue earned through competitive bidding on public and private construction contracts. Projects range from $264M interstate expansions to smaller municipal work.
2. Aggregate Materials Supply: United Rock Products supplies construction aggregate including natural/crushed gravel, sand, road base, premix blends, and recycled materials. Revenue from materials sales to construction companies and internal use.
3. Asphalt Mixtures Supply: Blue Diamond Materials produces and supplies hot mix asphalt, warm mix asphalt, rubber hot mix, perpetual pavement, cold mix, and Super Pave mixes. Six plants at five locations serve internal and external customers.
4. Specialty Construction Services:

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels7 records

Core offering

Sully-Miller Contracting Co. is a vertically integrated heavy civil construction company that self-performs grading, underground utilities, asphalt paving, concrete paving, and traffic control for infrastructure projects across Southern California. It operates through three divisions—Sully-Miller Contracting (general contracting), United Rock Products (aggregate production), and Blue Diamond Materials (asphalt manufacturing)—enabling single-source project delivery for roads, highways, airports, seaports, and rail facilities.

Product overview

Sully-Miller Contracting Co. operates as a vertically integrated heavy civil construction company consisting of three main divisions: Sully-Miller Contracting (heavy civil general contracting), United Rock Products (aggregate materials), and Blue Diamond Materials (asphalt mixtures). The company self-performs over 50% of work on all contracts, offering comprehensive services from material supply through construction. Sully-Miller Contracting provides grading, underground utilities, asphalt paving, concrete paving, concrete structures, traffic control, and quality control services for roads/highways, airports, seaports, rail/intermodal, and specialty construction markets. United Rock Products supplies aggregates including natural and crushed gravel, sand, road base, premix blends, and recycled materials, along with inert fill reclamation services. Blue Diamond Materials produces hot mix and warm mix asphalt products including rubber hot mix, EcoMat warm mix, perpetual pavement, cold mix, and Super Pave mixes. All three divisions operate under the Colas Group umbrella, enabling integrated project delivery from material extraction to final construction.

Differentiator

Problem solved

Functional benefit

Brands

• United Rock Products: Aggregate materials subsidiary providing locally sourced aggregate and inert fill materials including crushed rock, sand, gravel, road base, and recycled concrete/asphalt products.
• Blue Diamond Materials

Products and services

• Heavy Civil General Contracting Services Comprehensive heavy civil construction services including grading, underground utilities, asphalt paving, concrete paving, concrete structures, traffic control, quality control, and alternative project delivery for infrastructure projects serving government agencies and private developers.
• United Rock Products (Aggregate Materials) Locally-sourced aggregate and inert fill materials including natural and crushed gravel, sand, road base, premix blends, recycled concrete and asphalt, and specialty products supplied to construction companies and used internally by Sully-Miller Contracting.
• Road Base & Premix Blends Construction base materials including Type I/II/III aggregate slurry dust, rock dust, crushed miscellaneous base, P209 crushed aggregate base, 3/4 inch crushed aggregate base, 1/2 inch premix blend, and 3 inch minus, supplied for road and infrastructure construction.
• Natural & Crushed Gravel Crushed rock products including 3/4 inch, 1/2 inch, 3/8 inch, 1-1/2 inch, #2, #3, #4, #57 gravel, 2 inch filter rock, and Class 4 permeable base sold to construction companies and used internally.
• Sand Products Natural and manufactured sand products including washed plaster sand and washed concrete sand sold to construction companies.
• Recycled Concrete & Asphalt Recycled construction materials including recycled concrete and recycled asphalt for sustainable construction applications.
• Inert Fill Reclamation Services Construction debris reclamation and inert fill services that repurpose concrete, brick, clay, and soil to safely refill quarries at end of life cycle.
• Blue Diamond Materials (Asphalt Mixtures) Hot mix asphalt and warm mix asphalt products including rubber hot mix, EcoMat warm mix, perpetual pavement, cold mix, and Super Pave mixes for roads, highways, airports, and seaports. Operated from six plants at five locations, all awarded NAPA Diamond Achievement and Diamond Quality status.
• Rubber Hot Mix Asphalt Hot mix asphalt designed using recycled rubber tires as part of the binder for enhanced durability, produced by Blue Diamond Materials.
• EcoMat Warm Mix Asphalt Specially engineered warm mix asphalt produced at lower temperatures to reduce greenhouse gas emissions and energy consumption while maintaining quality pavement performance.
• Perpetual Pavement Long-life asphalt pavement designed for 30-40+ years durability with specialized mix design.
• Cold Mix Asphalt Asphalt mixture designed for cold weather applications and temporary repairs.
• Super Pave Mixes Asphalt mixtures designed to meet Superior Performing Asphalt Pavement (Superpave) specifications for enhanced performance.

Quantifiable outcome

• Over 100 years in business since 1923
• +3 more outcomes

Named customers9 records

Segments5 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

One partnership is on record.

• Colas GroupflagshipStrategic or Co-development PartnerParent company providing global resources and technical/financial strength. Sully-Miller is a U.S. subsidiary of Colas Group. Access to innovative technology, financial backing for large infrastructure projects, and global best practices.

Scale indicators9 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Skanska USA Civil: Large global contractor with significant California heavy civil operations including airports, highways, and rail. Competes on similar large-scale transportation and infrastructure bids in Southern California.
• Granite Construction Incorporated: Large publicly-traded heavy civil contractor with significant California presence in transportation, airports, and water infrastructure. Directly comparable scope of heavy civil services (grading, paving, underground utilities) and customer base (Caltrans, county transportation authorities), but operates at materially larger national scale.
• Tutor Perini Corporation: Large publicly-traded heavy civil and building contractor with significant California transportation, airport, and port project experience. Comparable in airport and highway work but operates at much larger scale (multi-billion revenue) and across geographies.
• Kiewit Infrastructure West Co. Major North American heavy civil contractor (subsidiary of Kiewit) with California transportation, rail, and airport project presence. Competes for large public infrastructure contracts in the same SoCal market.
• Flatiron Construction Corp: Heavy civil contractor (Hochtief/Abertis-owned) with strong California highway, bridge, and airport project portfolio. Comparable in transportation infrastructure scope with similar self-perform capabilities.

Direct peers

• Security Paving Company: Southern California-based heavy civil grading, paving, and underground utility contractor serving the same regional market and public agency customers (Caltrans, counties, municipalities). Closest direct comparable in terms of geographic footprint, service mix, and contract types.
• Sukut Construction: Heavy civil and earthmoving contractor based in Southern California with deep expertise in grading, site preparation, and infrastructure projects for public agencies. Comparable self-perform model and regional customer base with similar contract sizes.
• C.A. Rasmussen, Inc. Southern California heavy civil contractor specializing in grading, paving, and infrastructure for Caltrans, counties, and private developers. Comparable mid-sized regional player with similar scope and customer overlap.
• Ames Construction: Privately-held heavy civil contractor performing grading, paving, and infrastructure work for government agencies and private clients. Comparable self-perform heavy civil model and competitive bidding on transportation projects.
• Granite Construction / Vintage Paving (regional SoCal paving): Southern California asphalt paving and grading contractor with similar service offerings (asphalt production, paving, site work) competing for the same Caltrans and municipal projects.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/sullymillercontractingco
• LinkedInlinkedin.com/company/149187
• Instagraminstagram.com/sullymiller
• Xx.com/sullymiller

Revenue estimate

Valuation estimate

Number of profiles

Subsidiaries2 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 Sully-Miller Contracting Co.