What Manthei Construction does

Manthei Construction is a family-owned heavy civil and construction materials operator headquartered in Charlevoix, Michigan, operating under the legal entity MDC Contracting, LLC. The company originated in 1980 as Manthei Development Corporation, was rebranded to MDC Contracting in 2003, and rebranded again to its current Manthei Construction identity in 2023 to reflect its focus as a family business in the Northwest Michigan construction industry rather than as a land developer or generic contractor. The firm is part of The Manthei Group, a broader family of construction and building-products companies.

The company runs four integrated service lines. Site Development provides grading, utility installation (sanitary sewer, storm sewer, water main), parking lot construction, and foundation excavation across commercial projects ranging from $10,000 to $4,000,000, with over 30 years of grading experience. Underground Systems delivers municipal infrastructure projects, wastewater treatment plant construction, and city reconstruction, with a specialized HDPE pipe installation capability using Electrofusion welding — a rare competency north of Traverse City. The Aggregate division operates two crushing plants, three screening plants, a sand classifier, and one wash plant, producing MDOT-spec aggregates, custom sands, gravels, stone, and topsoil at customer sites or company pits across Northern Michigan. The HIGH FORMAT sub-brand manufactures concrete pavers, slabs, retaining walls, steps, caps, coping, and fire features, and has been extended into travertine and marble natural stone products.

Revenue is generated through project-based construction contracts, transaction-fee aggregate sales, and retail transactions at the Manthei Supply Store & Stone Yard on Heise Road in Charlevoix. The customer base is segmented horizontally across commercial developers, municipal governments, and other construction contractors, served through a direct, relationship-based sales motion rather than any formalized marketing or self-service channel. The technology stack is physical-asset-heavy — heavy construction equipment, aggregate processing plants, HDPE pipe installation rigs — with no disclosed software, AI, or platform component.

Name

Manthei Construction

Legal name

MDC Contracting, LLC

Website

https://mantheiconstruction.com

Company type

Private

Founded year

1980

Operating status

Operating

Headcount range

11–50 employees

Short description

Manthei Construction is a family-owned Northern Michigan contractor providing site development, underground utility installation, custom aggregate production, and HIGH FORMAT hardscape products to commercial developers, municipalities, and contractors across the region.

Ownership category

akta.pro rank

Product category

Heavy Construction Services

NAICS

Heavy and Civil Engineering Construction (237), Water and Sewer Line and Related Structures Construction (237110), Highway, Street, and Bridge Construction (237310)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600), Water, Sewer, Pipeline, Comm & Power Line Construction (1623), Mining & Quarrying Of Nonmetallic Minerals (No Fuels) (1400)

akta.pro primary industry

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

akta.pro secondary industries

Construction Aggregates Mining & Processing (Sand, Gravel, Crushed Stone) (IMADAAAI), Landscape Construction & Hardscaping (Patios, Retaining Walls, Outdoor Structures) (IMAIAIAE), Topsoil Stripping, Stockpiling & Reinstatement (IMAFAKAB)

Keywords

• Site development services
• Underground utility installation
• Aggregate materials supply
• Concrete hardscape products
• Municipal construction services

Headquarters

HQ city

Charlevoix

HQ country

United States

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Marketing or Sales

Revenue model

1. Construction Services: Project-based construction services including site development, underground systems installation. Projects range from $10,000 to $4,000,000.
2. Aggregate Materials: Production and sale of custom aggregates including MDOT specification aggregates, custom sands, gravels, stone, and topsoil for construction projects.
3. Landscape Supply: Manthei Supply store providing landscape materials and natural stone products to contractors and consumers.

Go-to-market motion1 record

Distribution channels2 records

Marketing channels5 records

Core offering

Manthei Construction provides site development (grading, excavation, utility installation), underground systems installation (HDPE pipe with Electrofusion, municipal infrastructure, wastewater treatment plants), and custom aggregate production (crushing, screening, MDOT-spec aggregates, sands, gravels, stone, topsoil). The company also manufactures HIGH FORMAT concrete hardscape products and operates a retail landscape materials supply store and stone yard.

Product overview

Manthei Construction is a Northern Michigan-based construction company offering a portfolio of interconnected heavy construction services. The core offerings include Site Development (grading and excavation services), Underground Systems (HDPE pipe installation and municipal infrastructure), and Aggregate (custom aggregate processing with crushing and screening operations). As part of the Manthei Group, the company also offers complementary landscape products through HIGH FORMAT Hardscapes (concrete pavers, walls, and natural stone) and Manthei Supply (landscape materials and stone yard). These services span site preparation, underground utilities, construction materials, and finished landscape products, providing a vertically integrated solution for construction and development projects in Northern Michigan.

Differentiator

Problem solved

Functional benefit

Products and services

• Site Development

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature1 record

Partnerships

One partnership is on record.

• Aster BrandsminorOthersRelated brand under the Manthei Group umbrella - a family of companies in the building products and construction industry. Not a formal external partnership.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Regional players

• The Shelly Company: Ohio-based site work, earthmoving, and aggregate supplier serving commercial, municipal, and DOT customers — a similar vertically integrated regional civil/aggregate model in an adjacent Midwest state.

Direct peers

• Ajax Paving Industries: Florida and Midwest heavy civil/site development contractor performing earthwork, underground utilities, and aggregate production — comparable in vertically integrated model even though primary geography differs.
• Zignego Group: Wisconsin-based heavy civil contractor specializing in grading, site development, aggregate production, and paving — comparable in integrated offerings and family-owned Midwest regional positioning.
• Fisher Contracting: Mid-Michigan heavy civil contractor performing site development, underground utilities, and aggregate supply for municipal and commercial clients — directly overlapping Manthei's three core service lines in the same regional market.
• Patten Construction Co. Midwest heavy and civil contractor performing earthwork, site preparation, underground utilities, and paving for commercial, industrial, and public-sector clients — directly comparable in scope and customer mix.
• Edw. C. Levy Co. Michigan-based aggregates producer and heavy civil contractor operating crushed stone plants, slag processing, and site development — directly comparable to Manthei's aggregate processing operations and civil construction services in the same state.
• Hardman Construction: Northern Michigan and Midwest site development, excavation, and underground utility contractor serving municipal and commercial customers — a close regional peer competing for similar public and private work.
• Rieth-Riley Construction Co. Indiana/Michigan-headquartered heavy civil contractor performing site development, earthwork, underground utilities, and paving — directly overlapping Manthei's core site development and underground systems services in the Midwest market.

Emerging players

• Techo-Bloc: Manufacturer of concrete pavers, slabs, and retaining wall systems sold through dealer networks — comparable to Manthei's HIGH FORMAT subsidiary on the hardscape product side, though a much larger national brand.

Broad incumbents

• Aggregate Industries US: National aggregate producer and heavy civil contractor operating crushing plants, ready-mix, and asphalt across the U.S. — a broad incumbent with overlapping capability in aggregates and site work, but serving a much larger footprint.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks6 records

Key highlights6 records

Customer concentration

• YouTubeyoutube.com/channel/UC7-pTNbD4VbZlgGyyWCVR_g
• Facebookfacebook.com/mantheiconstruction
• LinkedInlinkedin.com/company/mantheiconstruction
• Instagraminstagram.com/manthei_construction/?hl=en

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

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 Manthei Construction