What Diamond Materials does

Diamond Materials is a vertically integrated heavy highway and site development contractor headquartered in Newport, Delaware, serving government and commercial clients across Delaware, New Jersey, Pennsylvania, and Maryland. The company self-performs the full site-development stack — clearing, earthwork, drainage, underground utilities, demolition, milling, paving, cold-in-place recycling, soil cement stabilization, and on-site crushing and screening — using its own personnel and a large fleet of specialized equipment. It operates three asphalt production facilities (Wilmington Asphalt Plant, Tri-County Materials JV in Dover, Principio Asphalt JV in Port Deposit, MD) and four aggregate pits, providing internal material supply that reinforces cost control and schedule reliability.

The company's revenue model is project-based and bid-driven: competitive bidding for state DOT and municipal contracts (e.g., Delaware Department of Transportation), and direct negotiation with commercial real estate developers and general contractors for warehouse, retail, industrial, and healthcare site work. Pricing is quote-based per project, with no standardized tiers, and individual projects span single-digit to mid-eight-figure values (e.g., $34.87M warehouse, $15.7M landfill, $7.1M interchange). Secondary revenue comes from aggregate and materials sales to third parties from company-owned pits and plants, plus heavy equipment repair, rebuild, paint/sandblasting, and rental services out of the Bridgeton, NJ shop.

Diamond Materials was founded in 1997 and acquired by the Pierson family (Richard E. Pierson, Jr. and Michael K. Pierson) in 2000; it remains privately held with no disclosed institutional funding. The customer base spans state DOTs, municipalities, national retailers (Costco, Target, Burlington), healthcare operators, and a long roster of Mid-Atlantic commercial and industrial developers, with a documented pattern of delivering projects ahead of schedule and under budget. Workforce development is supported through the First State Skilled Field Training apprenticeship program in partnership with Corrado Construction.

Name

Diamond Materials

Legal name

Diamond Materials, LLC

Website

https://diamondmaterials.com

Company type

Private

Founded year

1997

Operating status

Operating

Headcount range

101–250 employees

Short description

Diamond Materials is a vertically integrated heavy highway and site development contractor serving government agencies and commercial developers across Delaware, New Jersey, Pennsylvania, and Maryland, with owned asphalt plants, aggregate pits, and a full equipment fleet.

Ownership category

akta.pro rank

Product category

Heavy Highway and Site Development Construction

NAICS

Asphalt Paving, Roofing, and Saturated Materials Manufacturing (32412), Stone Mining and Quarrying (21231), Poured Concrete Foundation and Structure Contractors (23811)

SIC

Asphalt Paving & Roofing Materials (2950), Construction - Special Trade Contractors (1700), Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)

akta.pro primary industry

Mass Excavation & Bulk Earthmoving (Cut/Fill, Grading) (IMAFAKAC)

akta.pro secondary industries

Aggregate Processing & Value-Added Products (Washing, Screening, Asphalt/Concrete Aggregates) (IMAKAHAH), Crushed Stone Quarrying & Processing (IMAKAHAA), Rock Excavation, Blasting & Quarry-Assist Works (IMAFAKAE)

Keywords

• Heavy highway construction
• Site development services
• Asphalt production
• Aggregate materials supply
• Commercial paving services

Headquarters

HQ city

Newport

HQ country

United Kingdom

HQ region

Europe

Offices10 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Heavy Highway Construction Services: Project-based construction services including asphalt production, paving, site development, milling, utility construction, marine services, demolition, and clearing/grubbing for government and private sector clients. Revenue is earned through competitive bidding on projects with pricing based on project scope, materials, labor, and equipment.
2. Aggregate and Materials Sales: Sales of construction materials including asphalt products, crushed stone, sand, gravel, and recycled materials from company-owned pits and plants. Includes both DOT-approved products and commercial materials.
3. Equipment Services: Heavy equipment repair, maintenance, rebuild, paint/sandblasting services, and equipment rental including milling machines ranging from 2 to 14 feet wide.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Diamond Materials is a heavy highway and site development contractor providing asphalt paving, site development, milling, demolition, clearing and grubbing, cold in-place recycling, utility construction, soil cement stabilization, marine services, and concrete curb and sidewalk installation. The company also produces and sells asphalt and aggregate materials from company-owned asphalt plants and pits, and operates a heavy equipment repair and rebuild shop.

Product overview

Diamond Materials is a heavy highway and site development contractor offering a comprehensive suite of construction services organized as distinct operational divisions. The company operates vertically integrated operations spanning asphalt production (Wilmington Asphalt Plant, Tri-County Asphalt, Principio Asphalt), aggregate material supply (Harrington Pit, Fox Pit, Reeves Road Pit, Indian Trail Pit), and direct construction services (Asphalt Paving, Site Development, Milling, Clearing and Grubbing, Demolition, Concrete Curb and Sidewalk, Cold In-Place Recycling, On-Site Crushing and Screening, Marine Services, Utility Construction, Soil Cement Stabilization). Supporting operations include heavy equipment repair/rebuild services and paint/sandblasting. The company also provides workforce development through its First State Skilled Field Training apprenticeship program. Projects are served primarily in Delaware, New Jersey, Pennsylvania, and Maryland.

Differentiator

Problem solved

Functional benefit

Brands

• First State Skilled Field Training: Apprenticeship program for current employees to gain knowledge and skills necessary to advance in the construction field, operated in partnership with Corrado Construction.
• Tri-County Materials
• Principio Asphalt

Products and services

• Asphalt Paving Asphalt paving services for public and private sector projects including highway and airport work, using state-of-the-art equipment to meet quality and rideability standards.
• Site Development Commercial, retail, industrial, and DOT site development covering clearing, earthwork, drainage, underground utilities, structural walls, curbs, walks, paving, and off-site improvements under a single contract.
• Milling Milling services for road repaving contracts in Delaware, Pennsylvania, Maryland, and New Jersey using rental-available milling machines from 2 feet to 14 feet wide.
• Demolition Full structural and selective demolition services for buildings, structures, industrial facilities, and bridges with emphasis on safety and project scheduling.
• Clearing and Grubbing Land clearing and grubbing services including complete clearing, grinding/chipping, and removal of all vegetative debris as a precursor to site development.
• Concrete Curb and Sidewalk Concrete contracting services ranging from curb repair to total new reconstruction using cutting-edge technology equipment, including ADA-compliant installations.
• Cold In-Place Recycling Road rehabilitation that mills 2-6 inches of existing asphalt pavement, mixes with emulsion, compacts on-site, and follows with asphalt overlay for roads, streets, and parking lots.
• On-Site Crushing and Screening Portable crushing and screening for rock, concrete, brick, or asphalt on-site, including fractionation of Recycled Asphalt Products delivered directly to asphalt plants.
• Marine Services Marine construction services delivered to meet customer demands with adherence to safety and environmental standards.
• Utility Construction Underground piping installation for sewer, drainage, and water supply, including utility relocation, extensions, dewatering, sheeting, shoring, and pipe system testing.
• Soil Cement Stabilization Soil-cement stabilization combining soil/aggregate, cement, and water to modify subgrade strength and provide working platforms in unsuitable ground conditions.
• Heavy Equipment Repair and Rebuild Services Comprehensive heavy equipment repair, maintenance, and rebuild services including diagnostics and complete equipment overhauls at the Bridgeton, NJ Heavy Equipment Shop.
• Paint and Sandblasting Services Heavy equipment restoration services with sandblasting and paint at the Bridgeton, NJ paint shop.
• Wilmington Asphalt Plant Asphalt production facility at 924 South Heald Street, Wilmington, DE, producing DOT-approved asphalt products for internal projects and external customers (hours 7:30 AM to 3:00 PM).
• Tri-County Asphalt Asphalt production facility at 3700 South Bay Road, Dover, DE, producing DOT asphalt products and cold patch materials via joint venture with George & Lynch.
• Principio Asphalt Asphalt production facility in Port Deposit, MD, established 2024 through partnership with York Building Products and P. Flanigan & Sons to produce and sell asphalt products in the Mid-Atlantic region.
• Harrington Pit Aggregate sales facility at 1069 Killens Pond Road, Harrington, DE offering recycled crushed asphalt, course millings, CR6/GABC, 57s, 8s, 3s, and screened topsoil.
• Reeves Road Pit Aggregate sales facility at 203 Reeves Road, Bridgeton, NJ offering septic sand, clay, common fill, select fill, and topsoil.
• Fox Pit Aggregate sales facility at 60 Fox Road, Bridgeton, NJ offering bio soil, K5, and pipe bedding sand.
• Indian Trail Pit Aggregate sales facility at 143 Indian Trail Road, Cape May Court House, NJ offering various construction materials.
• Heavy Equipment Sales and Inventory Sales of construction equipment inventory listed through the MachineryTrader platform.

Quantifiable outcome

• Completed SR1-SR72 Diverging Diamond Interchange more than one month ahead of schedule
• +4 more outcomes

Named customers15 records

Segments3 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

Partnerships

Five partnerships are on record, tiered core and minor.

• York Building ProductscoreStrategic or Co-development Partner · 1 January 2024Diamond Materials partnered with York Building Products and P. Flanigan & Sons in 2024 to establish Principio Asphalt in Port Deposit, MD. This partnership expands Diamond's asphalt production capacity in the Mid-Atlantic region.
• George & LynchcoreStrategic or Co-development Partner · 1 January 2012Tri-County Materials was formed in 2012 as a joint venture between George & Lynch and Diamond Materials, LLC to operate the Tri-County Asphalt plant in Dover, DE.
• R&M Shingle Recycling CompanyminorStrategic or Co-development Partner · 1 January 2012Diamond Materials formed R&M Shingle Recycling Company in 2012 to provide shingle recycling services as part of their sustainability and materials recycling operations.
• Corrado ConstructioncoreStrategic or Co-development PartnerDiamond Materials partnered with Corrado Construction to create First State Skilled Field Training, an apprenticeship program for construction employees. The program provides winter training for employees to become skilled laborers and operators, with State of Delaware/Federal approved curriculum leading to Journeyman Certificates.
• Johnson, Mirmiran & Thompson (JMT)coreImplementation/ SI/ Consulting PartnerFor the SR1-SR72 Diverging Diamond Interchange project, Diamond Materials hired JMT as the design engineer to work alongside Diamond Materials throughout the $7.1M project. The partnership was recognized by DelDOT for exceptional collaboration.

Scale indicators5 records

Recent moves16 records

Expansion highlights5 records

Direct peers

• York Building Products: York Building Products is a Mid-Atlantic aggregate, concrete, and asphalt producer partnered with Diamond in the Principio Asphalt JV; it operates similar crushed stone, sand, and asphalt lines and is a direct peer in materials.
• Corrado Construction: Corrado Construction is a Delaware-based site/civil contractor and Diamond's partner in the First State Skilled Field Training apprenticeship program; it performs similar grading, utility, and paving work and is a direct peer.
• H&K Group: H&K Group is a heavy civil construction, asphalt, and aggregates operator across Pennsylvania, Delaware, and the Mid-Atlantic with similar vertically integrated materials and contracting services; it is a direct peer given overlapping geographies, services (grading, paving, utilities), and an early JV heritage with Diamond Materials' founders.
• Allan Myers: Allan Myers is a Mid-Atlantic heavy civil/site development contractor (DE, PA, MD, VA) performing grading, paving, utilities, and aggregate production, with comparable DOT and large-developer client mix—making it one of Diamond's most direct regional competitors.
• Richard E. Pierson & Co. Richard E. Pierson & Co. is a New Jersey heavy/civil, utility, and site work contractor sharing the Pierson family name with Diamond's owners; it competes directly in NJ earthwork, utilities, and paving and is a direct peer.
• Stavola Companies: Stavola is a New Jersey-based producer of hot-mix asphalt, ready-mix concrete, sand, gravel, and recycled aggregates, with contracting arms performing paving and site work—directly overlapping Diamond's materials and paving businesses in NJ.
• P. Flanigan & Sons: P. Flanigan & Sons is a Baltimore-area heavy civil, paving, and site development contractor that is Diamond's partner in the Principio Asphalt JV in Port Deposit, MD; comparable services and Mid-Atlantic footprint make it a direct peer.
• George & Lynch: George & Lynch is a Dover, Delaware heavy/civil construction and paving contractor and Diamond's joint venture partner in Tri-County Materials; it offers nearly identical services (grading, asphalt paving, site development) and is a direct peer and operating partner.

Broad incumbents

• Tilcon (CRH subsidiary): Tilcon is a CRH-owned aggregates, asphalt, and paving operator across the Northeast and Mid-Atlantic; with national-corporate backing and similar materials-plus-paving services, it is a broad incumbent peer rather than a direct head-to-head regional competitor.
• Peckham Industries: Peckham Industries is a larger, multi-region road construction, asphalt, and aggregate producer across the Northeast and Mid-Atlantic; it overlaps Diamond's asphalt/aggregate businesses at a broader geographic scale and is a broad incumbent peer.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/diamond-materials-llc

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries8 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 Diamond Materials