Bauunternehmung Karl Gemünden

What Bauunternehmung Karl Gemünden does

Bauunternehmung Karl Gemünden GmbH & Co. KG is a privately held, 5th-generation family-owned German construction company founded in 1884 and headquartered in Ingelheim am Rhein. The company delivers full-service construction across three primary service models: Schlüsselfertig (turnkey), Rohbau (shell construction), and Schlüsselfertig mit Molitor (turnkey with sister-company pre-designed homes). It builds single-family homes, multi-family residential developments, commercial and office properties, research and laboratory facilities, and special-purpose buildings, executing more than 200 projects per year. Revenue is generated primarily through project-based construction contracts under German VOB (commercial/public) and BGB (private) frameworks, with intra-group revenue streams from affiliated companies in the TT1884 Holding ecosystem that covers development, technical building services, energy supply, property management, facility management, brokerage, and hospitality.

The company differentiates on a 'Bauen aus einer Hand' one-stop integrated model, a 140-year brand heritage, and a self-owned equipment fleet (47 underslung cranes, 34 top-slewing cranes, plus excavators, loaders and a 50t Sennebogen crawler crane) backed by in-house workshops. It has invested in proprietary digital and AI-enabled tools — PACTA 4.0 (contract management), Focused.AI (intelligent mail assistant), ESKIMO (AI helmet-camera construction site monitoring against digital twins), SmartTOM (HVAC energy monitoring), and Sm@rtHome / myQuapp (smart-home and neighbourhood app) — co-developed with Hochschule Mainz and other research partners. Sustainability credentials include geothermal, cold district heating networks, PV systems, a 100% CO2-neutral headquarters, and HVO synthetic diesel in the vehicle fleet. Customer mix spans private homeowners (Schlüsselfertig/Rohbau), commercial developers, public-sector clients (e.g., the Ingelheim district administration), and specialised mission-critical clients (BioNTech, Novo Nordisk, NABU). The group employs 650-700+ people across 14 companies and ranks 6th among Germany's most popular family businesses in the 2025 WirtschaftsWoche study; operations remain concentrated in the Rheinhessen and Rhein-Main metropolitan regions.

Name

Bauunternehmung Karl Gemünden

Legal name

Bauunternehmung Karl Gemünden GmbH & Co. KG

Website

https://gemuenden-bau.de

Company type

Private

Founded year

1884

Operating status

Operating

Headcount range

251–500 employees

Short description

Bauunternehmung Karl Gemünden is a 5th-generation, family-owned German construction company in Ingelheim am Rhein that delivers turnkey, shell, and special-purpose construction (residential, commercial, laboratory, historic) for private homeowners, developers, and public-sector clients across the Rheinhessen and Rhein-Main region.

Ownership category

akta.pro rank

Product category

General Construction Services

NAICS

New Single-Family Housing Construction (except For-Sale Builders) (236115), New Multifamily Housing Construction (except For-Sale Builders) (236116), New Housing For-Sale Builders (236117), Plumbing, Heating, and Air-Conditioning Contractors (238220)

SIC

General Bldg Contractors - Residential Bldgs (1520), General Bldg Contractors - Nonresidential Bldgs (1540)

akta.pro primary industry

Residential Design-Build & Renovation-Integrated Builders (IMAFABAE)

akta.pro secondary industries

Building Automation & Controls (BAS/BMS) Contracting (IMAFALAE), Building Automation & Controls (BAS/BMS) (HSAPAPAA), Microgrid, DER & Building Electrification Energy Controls (Solar/Storage/EV Load Orchestration) (BPABAGAJ)

Keywords

• General construction services
• Residential home building
• Commercial building construction
• Research laboratory construction
• Turnkey construction contracting

Headquarters

HQ city

Ingelheim Am Rhein

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. General construction services (contract revenue): The company generates revenue primarily through direct construction contracts with private clients (homeowners), commercial developers, and public-sector clients. Projects range from small works (garden walls, single-family homes) to large-scale commercial buildings (shopping centres, laboratory buildings, district administration). Revenue is project-based, one-time at contract level, with post-construction maintenance typically handled by affiliated companies (facility management, property management). The company also benefits from affiliated companies across the full property lifecycle, generating revenue within the group through project development, technical services, and property management.
2. Turnkey housing ( schlüsselfertig ): Full-service turnkey housing packages from planning through to handover. Customers pay for the complete house delivery as a bundled product. Revenue is recognised at project completion. Additional revenue derives from the sister company J. Molitor Immobilien GmbH, which develops and sells pre-planned residential units to private buyers.
3. Property development & sales (via group companies): The holding group (TT1884 Holding) encompasses 14 companies covering the full property lifecycle: project development (Molitor), building construction (Gemünden), technical building services (GTR), energy supply (EVI), property management (I.H.R.), facility management (FMR), real estate brokerage (Molitor select), hospitality (TT Hospitality), and specialist trades (electrical, metalwork, timber). Group companies generate revenue from property sales, rental management, and ongoing service contracts.

Go-to-market motion2 records

Distribution channels5 records

Marketing channels10 records

Core offering

Bauunternehmung Karl Gemünden is a German family-owned general contractor that builds residential homes (single-family, semi-detached, multi-family, villas), commercial and mixed-use properties, research and laboratory buildings, and special-purpose real estate (hotels, medical centers, synagogues, historic restorations), also performing renovation and conversion of existing buildings. Projects are delivered under turnkey (Schlüsselfertig), shell (Rohbau), or pre-planned (Schlüsselfertig mit Molitor) service models, with renewable-energy systems (geothermal, photovoltaic, cold district heating), smart-home controls (Sm@rtHome, myQuapp, SmartTOM) and the BetterCharge solar carport integrated into the delivery. The company operates as the construction arm of the 14-company TT1884 Holding group, providing single-source responsibility across planning, construction, and post-construction operations.

Product overview

Bauunternehmung Karl Gemünden is a full-service construction company offering residential, commercial, and specialized building construction services. The company operates an integrated business model (Bauen aus einer Hand) combining development, planning, construction, and facility management through subsidiary companies including J. Molitor Immobilien (real estate development), GTR GmbH (building technology), Elektro Grunow (electrical), Metallbau Roehn (metal construction), Holzbau Ammann (wood construction), and FMR/I.H.R. (facility management). Core construction products include house building (single-family, semi-detached, villas), residential and commercial real estate, research/laboratory buildings, and special-purpose properties, offered in turnkey (Schlüsselfertig), shell (Rohbau), or renovation (Umbau im Bestand) models. Technology products include BetterCharge (sustainable EV carport), SmartTOM (energy monitoring), Sm@rtHome (building automation), Focused.AI (AI email management), ESKIMO (AI construction site monitoring), PACTA 4.0 (digital contract management), and Kaltes Nahwärmenetz (geothermal district heating). The company also provides building greening, species protection, and sustainable construction services including geothermy, photovoltaics, and climate-friendly concrete.

Differentiator

Problem solved

Functional benefit

Products and services

• Hausbau (Residential home building) Construction of single-family homes, semi-detached houses, modern city villas, and free-standing family homes on the client's own land, targeted at private homeowners across Rheinhessen and the Rhein-Main region.
• Wohnimmobilien (Multi-family residential construction) Construction of multi-family residential buildings and larger housing projects, delivered under the Schlüsselfertig turnkey model with coordination by Gemünden Bau, often marketed via sister company J. Molitor Immobilien.
• Gewerbeimmobilien (Commercial real estate construction) General-contractor construction of office parks, retail centres, mixed-use business complexes, and other commercial buildings for developers and corporate clients.
• Forschungs- und Laborgebäude (Research and laboratory building construction) Construction of specialised research and laboratory facilities, including high-specification pharmaceutical and biotech buildings such as the BioNTech laboratory in Mainz and the Novo Nordisk German headquarters.
• Spezialimmobilien (Special real estate construction) Construction of special-purpose properties including hotels, medical centres, religious buildings such as the Mainz Synagogue for the Jewish Community, and other non-standard building types.
• Umbau im Bestand (Renovation and conversion of existing buildings) Renovation, conversion, and modernisation of existing structures, including historic building restoration, targeted at private owners, commercial clients, and the public sector.
• Schlüsselfertig (Turnkey construction) service model Full turnkey construction package from planning to handover, with Gemünden coordinating all trades under one contract and delivering a ready-to-move-in home; available for row houses, semi-detached houses, city villas, and free-standing single-family homes.
• Rohbau (Shell construction) service model Structural shell-construction service for clients who choose their own architects and coordinate remaining trades themselves; Gemünden delivers only the Rohbau (shell).
• Schlüsselfertig mit Molitor (Molitor pre-planned home) service model Pre-planned Eigenheim (own home) offered in collaboration with sister company J. Molitor Immobilien, ranging from single-family homes to residential estates with row and semi-detached houses and senior-appropriate apartments, with options to customise finishes during construction.
• BetterCharge solar carport Turnkey, modular solar carport combining PV modules, wooden construction with low-CO2 geopolymer concrete, an integrated wallbox (11–22 kW) for EV charging, and smart load management — supplied to property owners and developers as a single-day installation.
• Kaltes Nahwärmenetz (Cold district heating network) Geothermal cold district heating network (~150 m deep probes) delivering cost-stable heating and passive summer cooling for residential estates, deployed in group-built projects such as 'An der Saalmühle'.

Quantifiable outcome

• Up to 91% CO2 reduction when using HVO synthetic diesel (vs. conventional diesel) in the vehicle fleet.
• +4 more outcomes

Named customers6 records

Segments4 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature7 records

Partnerships

16 partnerships are on record, tiered core and minor.

• Roomstone GmbH (Simmern)coreStrategic or Co-development PartnerJoint product development partner for BetterCharge — a climate-friendly solar carport combining PV, wood construction, and geopolymer concrete. Gemünden and Roomstone co-developed the all-in-one charging solution. Gemünden provides construction expertise and market access; Roomstone contributes product design and materials expertise.
• Hochschule MainzcoreStrategic or Co-development PartnerOngoing research and development partnership covering multiple projects: SmartTOM (energy monitoring device), ESKIMO (AI-based construction site monitoring), dynamic construction acceptance, and PV-based EV parking solutions. The collaboration also extends to educational content (Gemünden Akademie tutorial videos) and dual study programme partnerships (Bauingenieurwesen, BWL, Technisches Immobilienmanagement).
• Hochschule DarmstadtminorStrategic or Co-development PartnerResearch cooperation in building technology and energy-efficient building operations. Partner in the ongoing development of building equipment and systems.
• ESKIMO consortium partnerscoreTechnology or IntegrationGemünden is a project partner in the ESKIMO research initiative — a nationwide research project applying AI (artificial intelligence) to construction site monitoring. The AI system uses helmet-mounted cameras to compare the as-built site against the digital 3D building model and automatically detect defects, missing components, and deviations.
• J. Molitor Immobilien GmbHcoreStrategic or Co-development PartnerSister company and the group's project development arm. Develops residential and commercial properties on its own account and as a service to clients. Gemünden serves as the preferred general contractor for Molitor-developed projects. Molitor also offers pre-designed residential units (Schlüsselfertig mit Molitor) as a third housing model for Gemünden customers.
• GTR Gebäudetechnik Rheinstraße GmbHcoreImplementation/ SI/ Consulting PartnerTechnical building services planning company within the group. Responsible for designing the technical building infrastructure (HVAC, electrical, geothermal, smart home systems) for all Gemünden construction projects. Also conducts applied research in cooperation with Hochschule Mainz.
• EVI Energieversorgung Ingelheim GmbHcoreImplementation/ SI/ Consulting PartnerEnergy supply company within the group. Operates and manages energy infrastructure including the cold district heating network (Kaltes Nahwärmenetz) at the 'An der Saalmühle' project and other residential estates. Responsible for long-term operation of renewable energy systems installed in group-built buildings.
• Elektroanlagen Grunow GmbH & Co. KGcoreImplementation/ SI/ Consulting PartnerSpecialist electrical contracting company within the group, handling electrical installations for all Gemünden projects. Plans and installs electrical systems, smart home solutions (KNX), and building automation. Also provides electrical maintenance services via its own workshop.
• ROEHN Metallbautechnik GmbHminorImplementation/ SI/ Consulting PartnerMetal construction company based in Simmertal, part of the group. Produces custom metal components and assemblies for Gemünden construction projects, including facade elements, steel structures, and architectural metalwork.
• Holzbau Ammann GmbH & Co. KGcoreImplementation/ SI/ Consulting PartnerTimber construction specialist within the group, with over 190 years of experience in the trade. Supplies and installs timber structures, roof trusses, wooden facades, and timber hybrid construction systems for Gemünden projects. Also produces timber-based products for carports (BetterCharge) and other prefabricated timber elements.
• I.H.R. GmbH (Immobilienverwaltung)coreChannel Partner/ Reseller/ DistributorProperty management company within the group. Handles the ongoing management and administration of residential and commercial properties after construction completion. Acts as a distribution channel for ongoing property management mandates derived from Gemünden's construction projects.
• F.M.R. GmbH (Facility-Managementgesellschaft Rheinstraße)coreChannel Partner/ Reseller/ DistributorFacility management and building cleaning service within the group. Provides ongoing facility management for multi-family residential and commercial properties built by Gemünden, covering maintenance, repair, and cleaning services.
• Molitor select GmbHcoreChannel Partner/ Reseller/ DistributorIn-house real estate brokerage subsidiary operating in Rheinhessen and the Rhein-Main area. Markets residential and commercial properties developed and built by group companies. Creates direct sales channels to end-buyers for completed and in-development group properties.
• TT Hospitality GmbH & Co. KGminorChannel Partner/ Reseller/ DistributorHospitality management company within the group, operating hotels (including Hofgut Wißberg — Weinberghotel) and developing new hotel projects (Kiedrich, Rheingau). Gemünden constructs the hotel properties; TT Hospitality operates them. Also holds the 'Best of Wine Tourism Award 2022'.
• Mainz 05 (1. FSV Mainz 05 e.V.)minorGTM or Marketing PartnerFootball club sponsorship. Gemünden Bau sponsors the main stand ('Gemünden Bau-Haupttribüne') of the Mainz 05 stadium. The company also holds 'Sponsor of the Day' events and provides free match tickets to employees and trainees. The partnership serves employer branding and regional brand awareness.
• zündung GmbH (Frankfurt am Main)minorImplementation/ SI/ Consulting PartnerCreative and digital agency responsible for the conception, design, and technical implementation of the Gemünden Bau website. Listed as the agency's contact details on the impressum page.

Scale indicators7 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• GOLDBECK GmbH: German family-owned construction company (Bielefeld) specializing in system-based commercial, hall, and residential buildings with strong in-house engineering and digital processes. Highly comparable as another multi-generational German design-build contractor investing in BIM and industrialized construction.
• Zech Group SE: German family-owned construction group with national footprint across real estate development, general contracting, and facility management. Comparable as a privately held, diversified German construction group operating across the full property lifecycle.
• Köster GmbH: German general contractor focused on turnkey commercial, residential, and industrial construction with proprietary process and digital project-management tools. Comparable as a German design-build firm emphasizing integrated single-source delivery similar to Gemünden's 'Bauen aus einer Hand'.
• Leonhard Weiss GmbH & Co. KG: Family-owned German construction company operating across building construction, civil engineering, and road construction with regional depth. Comparable as a multi-generation German private construction firm with similar geographic concentration and broad building scope.
• Firmengruppe Max Bögl: Family-owned German construction and technology company active in high-rise, infrastructure, modular construction, and renewable energy (wind, geothermal). Comparable as a German family-owned builder with strong renewable energy / sustainability profile and proprietary engineering capabilities.

Broad incumbents

• Ed. Züblin AG: Major German general contractor, subsidiary of Strabag SE, serving commercial, residential, and civil engineering markets across Germany. Comparable as a large German general contractor overlapping on building construction and complex project delivery.
• HOCHTIEF AG: Germany's largest construction company with global operations across building, infrastructure, and PPP projects. Comparable as a German-headquartered incumbent general contractor operating in the same building-construction category, though at much larger scale and broader geographic scope.

Regional players

• Heitkamp & Thumann Group / Heitkamp Bau: German family/group-owned regional general contractor with strengths in turnkey construction, renovation, and infrastructure. Comparable as a privately held German contractor with similar mid-size regional operating model and private ownership structure.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat6 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/channel/UCPHWXsC-8xWYEyTWR680gQw
• Instagraminstagram.com/karl_gemuenden

Revenue estimate

Valuation estimate

Number of profiles

Profiles4 records

Subsidiaries10 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments1 record

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Bauunternehmung Karl Gemünden