What Stolz Bau does

Stolz Bau (legal name: Gebr. Stolz GmbH & Co. KG) is a family-owned German mid-market construction group headquartered in Hammelburg, Unterfranken, founded in 1875 by Bernhard Stolz as a masonry business and now in its fourth generation of family management under sole Geschäftsführer Alexander Stolz. The company delivers integrated construction services spanning civil engineering (Tiefbau), road construction (Straßenbau), structural and high-rise engineering (Hoch- und Ingenieurbau), earthworks with in-house geotechnical laboratory, precast concrete construction, environmental technology and landfill remediation, building restoration, project development, construction logistics, surveying, traffic safety, and construction materials supply. It serves a dual customer base of municipalities and government agencies (public infrastructure, fire stations, village center developments, canal and bridge construction) and private developers and industrial clients (production halls, multi-family residential, wineries, hydrogen refueling infrastructure).

Underpinning the service offering is a vertically integrated subsidiary network of ten wholly-owned entities that operate the group's physical production assets: seven asphalt mixing plants (Schweinfurt, Untererthal, Grafenrheinfeld, Gänheim, Münnerstadt, Dettelbach, Gössenheim), two ready-mix concrete plants (Hammelburg-Untererthal, Wildflecken), a precast concrete factory, a recycling and asphalt recovery facility in Walldorf, an internal transport and logistics arm, and specialized traffic safety and environmental services units. The group employs over 400 people and operates across Unterfranken, broader Bavaria, and Thuringia.

The business model is project-based and direct-sales-led: all construction services are individually quoted per project scope with multi-year contract cadences typical for public tenders; there are no public price lists, subscriptions, or standardized tiers. Go-to-market is sales-led, anchored by competitive bidding on municipal and federal public procurement (supported by Präqualifikationsbescheinigungen and canal/ÜChem certifications), direct negotiation with private industrial and real estate developers, and brand-building through project-referencing on the company website, social media (Facebook, Instagram, LinkedIn), careers fairs, and school/community outreach. Revenue is generated from construction services contracts plus the sale of asphalt, concrete, and recycled construction materials to both internal projects and external customers. Pricing is opaque, value is delivered through single-source responsibility, in-house quality control (geotechnical lab), and regional proximity enabled by the materials plant network. The company is privately held by the Stolz family with no external institutional investment disclosed.

Name

Stolz Bau

Legal name

Gebr. Stolz GmbH & Co. KG

Website

https://stolz-bau.com

Company type

Private

Founded year

1875

Operating status

Operating

Headcount range

101–250 employees

Ownership category

akta.pro rank

Product category

Construction Services

NAICS

Heavy and Civil Engineering Construction (237), Poured Concrete Foundation and Structure Contractors (23811), Ready-Mix Concrete Manufacturing (32732), Cement and Concrete Product Manufacturing (3273), Structural Steel and Precast Concrete Contractors (23812)

SIC

Heavy Construction Other Than Bldg Const - Contractors (1600), Water, Sewer, Pipeline, Comm & Power Line Construction (1623), Concrete Products, Except Block & Brick (3272)

akta.pro primary industry

Commercial General Contracting (New Build) (IMAFAAAA)

akta.pro secondary industry

Concrete Masonry Units (CMU) & Concrete Blocks (IMADABAB)

Keywords

• Road construction services
• Civil engineering construction
• Structural engineering services
• Precast concrete manufacturing
• Construction materials supply

Headquarters

HQ city

Hammelburg

HQ country

Germany

HQ region

Europe

Offices5 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Construction project services: General construction services encompassing road construction, underground/civil engineering, high-rise and structural engineering, earthworks, precast concrete construction, environmental technology, project development, building restoration, construction logistics, building materials supply, surveying, and traffic safety. Revenue is generated through project-based contracts with public and private clients.
2. Construction materials supply: Supply of asphalt and concrete from own asphalt mixing plants (seven locations) and concrete mixing plants (two locations). Also includes material recovery and recycling of construction materials.

Pricing tiers

Go-to-market motion2 records

Distribution channels2 records

Marketing channels5 records

Core offering

Stolz Bau is an integrated mid-sized construction services group operating across road construction, civil/underground engineering, structural and high-rise engineering, earthworks, precast concrete manufacturing, environmental technology, building restoration, project development, surveying, and traffic safety. The company self-supplies construction materials through seven asphalt mixing plants and two concrete plants, delivering turnkey projects from a single source.

Product overview

Stolz Bau (Gebr. Stolz GmbH & Co. KG) is a mid-sized construction company group founded in 1875, headquartered in Hammelburg, Germany, with over 400 employees. The company operates as a unified construction services provider offering a comprehensive range of interconnected building and civil engineering services. The core offering spans Tiefbau (civil engineering), Straßenbau (road construction), Hochbau (structural engineering), Erdbau (earthworks), Fertigteilbau (precast concrete), Umwelttechnik (environmental technology), Bauwerksanierung (building restoration), and Baulogistik (construction logistics). These services are supported by a network of ten subsidiary companies producing construction materials (asphalt, concrete), providing transport and logistics, and offering specialized services like traffic safety and environmental remediation. The group operates seven asphalt mixing plants and two concrete plants across northern Bavaria and Thuringia, enabling integrated project delivery from earthworks through materials supply to finished structures.

Differentiator

Problem solved

Functional benefit

Products and services

• Tiefbau (Civil Engineering) Civil and underground engineering services including earthworks, canal construction, pipeline installation, and environmental technology solutions for municipalities and private clients.
• Straßenbau (Road Construction) Complete road construction services for highways, federal and state roads, municipal streets, industrial sites, parks, and cycling/hiking paths, including DSH-V thin-layer coatings and milling services.
• Hochbau / Ingenieurbau (Structural Engineering) Planning, construction, and execution of structural engineering projects including industrial/commercial buildings, precast structures, residential construction, bridges, parking structures, and educational/healthcare facilities.
• Erdbau / Erdbaulabor (Earthworks & Geotechnical Laboratory) Earthwork services including dams, cuttings, ground improvements, dike construction, geotechnical consulting, quality control, and laboratory testing through an in-house earth and foundation engineering laboratory.
• Fertigteilbau (Precast Concrete Construction) Production of prefabricated concrete elements for industrial halls, structural engineering, and special manholes for civil engineering, manufactured in the company's own precast plant.
• Projektentwicklung (Project Development) End-to-end project development covering the complete lifecycle, including turnkey construction delivery, property developer services (Bauträger), or general contractor roles for public and private sector clients.
• Bauwerksanierung (Building Restoration) Specialized building restoration including concrete repair, bridge rehabilitation, masonry drying, shotcrete work, injection work, and building coatings, delivered by Stolz Bauwerksanierung GmbH.
• Baulogistik (Construction Logistics) Construction logistics including machinery selection, deployment, maintenance and repair, and material/equipment logistics, managed by STL Service-Transport-Logistik GmbH.
• Baustoffe (Construction Materials Supply) Supply of certified asphalt and concrete, building material recycling and recovery, and construction material consulting, supported by seven asphalt plants and two concrete plants across the region.
• Deponie / Umwelttechnik (Landfill & Environmental Technology) Environmental technology services including landfill profiling, landfill covers, renaturation measures, hill rehabilitation, and soil replacement.
• Verkehrssicherung (Traffic Safety) Traffic safety and traffic management services at construction sites and road work zones, provided by VESTRA Verkehrssicherung GmbH.

Quantifiable outcome

• Complete construction services from a single provider, from excavation to building materials to finished structure

Named customers8 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

Six partnerships are on record, tiered flagship, core and minor.

• Tyczka HydrogenflagshipStrategic or Co-development Partner · 1 January 2025STOLZ partnered with Tyczka Hydrogen for the groundbreaking of an H₂ refueling station at Schweinfurt port. The facility will supply up to 1,000 kg of green hydrogen daily for hydrogen-powered vehicles, forming a central element of a planned H₂ hub.
• VESTRA Verkehrssicherung GmbHcoreStrategic or Co-development Partner · 1 January 2019VESTRA Verkehrssicherung GmbH was founded in 2019 as a 100% subsidiary of Gebr. STOLZ GmbH & Co. KG. It specializes in traffic safety measures at road construction sites and working areas, providing an integrated service within the STOLZ group.
• Bundesverband mittelständischer Bauunternehmen (BV MB)minorOthersSTOLZ is a member of the Federal Association of Medium-Sized Construction Companies (BV MB), the primary industry association for medium-sized construction firms in Germany.
• Vereinigung der Straßenbau- und Verkehrsingenieure Bayern (VSVI)minorOthersSTOLZ is a member of the Association of Road Construction and Traffic Engineers Bavaria (VSVI), a professional body for infrastructure engineering professionals.
• Landesverband Bayerischer Bauinnungen (LBB Bayern)minorOthersSTOLZ is a member of the Bavarian Construction Guild Association (LBB Bayern), representing crafts and trade in the construction sector in Bavaria.
• Gemeinde Gräfendorf (municipal project partner)flagshipStrategic or Co-development PartnerSTOLZ is executing the 'Saaletaler Höfe' village center development project in Gräfendorf — a €6 million project with over €4 million in federal and state funding. The project involves constructing a modern village center with grocery store, medical center, and community space.

Scale indicators5 records

Recent moves9 records

Expansion highlights5 records

Broad incumbents

• HOCHTIEF AG: Major German construction contractor with national and international footprint in building, civil, and infrastructure. Overlaps with STOLZ on municipal and industrial projects but operates at vastly larger scale and global scope.
• Bauer AG: German construction and foundation engineering specialist operating in civil engineering, environmental technology, and infrastructure. Comparable overlap with STOLZ's Erdbau, Tiefbau, and Umwelttechnik service lines.
• Ed. Züblin AG: German subsidiary of STRABAG and one of the largest German construction companies, covering building construction, civil engineering, and tunnelling. Comparable as a competitor for larger structural engineering tenders STOLZ might bid on.
• STRABAG SE: Europe's largest construction group with deep presence in German road, civil, and structural engineering. Operates broadly rather than in STOLZ's regional niche, but directly competes for the same public tenders and private projects at national scale.

Direct peers

• Leonhard Weiss GmbH & Co. KG: Family-owned German construction group with similar integrated civil engineering, road construction, and structural engineering services. Comparable as a Mittelstand contractor operating its own materials production and serving municipalities plus private clients across southern Germany.
• Johann Bunte Bauunternehmung GmbH & Co. KG: Mid-sized German contractor focused on road construction, civil engineering, and infrastructure. Highly comparable to STOLZ's Straßenbau and Tiefbau operations and its asphalt production focus.
• Goldbeck GmbH: German construction firm specializing in commercial/industrial building construction with own precast concrete production. Comparable to STOLZ's Fertigteilbau and Hochbau capabilities and its industrial customer base (e.g., Hanse Haus, Pabst).
• Heitkamp Unternehmensgruppe: German construction group covering civil engineering, road construction, and environmental remediation. Comparable to STOLZ's broad service portfolio including environmental technology (RSU Umweltdienste equivalent).
• Köster GmbH: German construction company offering integrated building, civil engineering, and infrastructure services with own precast/prefab production. Closely comparable to STOLZ in family ownership, mid-sized scale, and full-service delivery model.
• Max Bögl Stiftung & Co. KG: Family-owned German construction and precast concrete group with civil engineering, structural engineering, and renewable energy capabilities. Highly comparable as a family-owned Mittelstand player with own precast production serving wind and infrastructure markets.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/stolz.bau
• LinkedInde.linkedin.com/company/gebr-stolz-gmbh-&-co-kg
• Instagraminstagram.com/stolz.bau/?hl=de

Compliance8 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Subsidiaries9 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 Stolz Bau