Großhaus

What Großhaus does

Großhaus GmbH is a family-owned IT services provider headquartered in Duisburg, Germany, operating under the legal name Ing. Büro für Informationstechnik Karl-Heinz Großhaus GmbH since its founding around 1992. The company functions as a full-service IT department replacement for small and medium-sized businesses (SMBs) across the Duisburg and broader Ruhr metropolitan area, serving approximately 40+ named reference customers in verticals including logistics, healthcare, automotive, financial services, legal, manufacturing, retail, and public administration. Its core service portfolio spans network installation and administration, network security (exclusively Sonicwall-based), printer/plotter/label-printer repair and preventive maintenance, hardware resale (AVM FRITZ!Box, Wortmann Terra, Fujitsu, Synology NAS), custom .NET and Java software development, Azure PaaS solutions, Telegram bot development, responsive web design (Orchard, WordPress, TYPO3), and AI integration consulting. The current managing director is Sven Ipers.

The business model combines recurring managed-IT contracts and the recently launched WLAN-as-a-Service subscription (€10 net per EAP772 access point per month) with project-based professional services (custom software, web design, network installation) and transactional hardware sales. Distribution is direct and regional: on-site field service across 15+ Ruhr-area cities plus TeamViewer-based remote support, with inbound leads generated through the company's website, a free non-binding "IT-Check" diagnostic offer, blog content, and a Facebook page. Marketing is predominantly content-driven via cybersecurity advisories, GDPR reminders, and technology-trend articles on grosshaus-gmbh.de, with no paid advertising or marketplace/reseller channels.

Strategically, Großhaus exited its 20+ year in-house hardware workshop operation in 2018 to focus on managed services and software, deepened its vendor partner ecosystem (Microsoft, Sonicwall, AVM, Wortmann Terra, Synology, TeamViewer), and in 2024-2025 added two new product lines — AI solutions and WLAN-as-a-Service — to move further into recurring-revenue territory. The company has no disclosed institutional investors, parent company, subsidiaries, or M&A activity, and is wholly owned and controlled by its founder family.

Name

Großhaus

Legal name

Ing. Büro für Informationstechnik Karl-Heinz Großhaus GmbH

Website

https://grosshaus-gmbh.de

Company type

Private

Founded year

1992

Operating status

Operating

Headcount range

11–50 employees

Short description

Großhaus GmbH is a family-owned Duisburg-based IT services provider offering managed IT, network security, printer maintenance, custom .NET software, Azure PaaS, web design, and WLAN-as-a-Service to 40+ SMB and mid-market customers across the Ruhr metropolitan region.

Ownership category

akta.pro rank

Product category

Managed IT Services for SMBs

NAICS

Computer Systems Design Services (541512), Custom Computer Programming Services (541511), Other Computer Related Services (541519)

SIC

Services-Computer Integrated Systems Design (7373), Services-Computer Programming Services (7371), Services-Facilities Support Management Services (8744)

akta.pro primary industry

ITSM Managed Services (Run/Operate/Optimize) (BPAEAJAN)

akta.pro secondary industries

Managed Print Hardware (Fleet/Departmental Printers) (HDACAEAK), Collaboration & Productivity Platforms (M365/Google Workspace, Email, Chat/Meetings) (BPAEAIAD)

Keywords

• Managed IT services
• Network installation
• Printer repair service
• Custom software development
• WLAN-as-a-Service

Headquarters

HQ city

Duisburg

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Managed IT Services & Support: Ongoing IT support contracts and managed services including network monitoring, system administration, maintenance, and remote/field support. Revenue is generated through recurring service arrangements, with remote support enabling accurate, per-minute billing transparency.
2. WLAN-as-a-Service Subscription: Monthly flat-rate subscription model for managed wireless infrastructure. Customers pay a fixed fee per access point per month, inclusive of hardware, cloud management, and device replacement service.
3. Hardware Sales & Resale: Sales and resale of IT hardware including Fujitsu/Fujitsu Wortmann Terra PCs, AVM FRITZ!Box routers, Synology NAS systems, and related peripherals. Revenue recognized on a one-time transactional basis.
4. Custom Software Development: Bespoke .NET and Java software development services, including web applications, desktop apps, mobile apps, Telegram bots, and Azure PaaS projects. Billed on a project or time-and-materials basis.
5. Web Design & Development: Design and development of responsive websites using modern CMS platforms (Orchard, WordPress, TYPO3), including SEO optimization, CMS integration, and content management system training. Billed as project engagements.
6. Printer Repair & Maintenance Services: On-site and workshop-based repair and preventive maintenance services for laser printers, plotters, and Zebra label printers. Revenue recognized per service call or maintenance contract.

Pricing tiers

Go-to-market motion1 record

Distribution channels4 records

Marketing channels5 records

Core offering

Großhaus GmbH provides comprehensive IT services for small and medium-sized businesses in the Duisburg/Ruhr area, including managed IT support (network installation, Active Directory, server/client administration, Windows Server and Sonicwall updates), on-site printer repair and preventive maintenance for laser printers, plotters, and Zebra label printers, custom .NET/Azure software development, Telegram bot integration, responsive web design with CMS (Orchard, WordPress, TYPO3), network security solutions, and WLAN-as-a-Service on a flat monthly subscription. It also resells hardware from AVM, Wortmann Terra, Fujitsu, and Synology, and bundles Office 365 with Synology NAS as a digital office package.

Product overview

Großhaus GmbH is an IT service company offering comprehensive IT services for small and medium businesses in the Duisburg region. Their portfolio includes IT-Service (network, hardware, software, security), Druckerservice (printer/plotter repair and maintenance), Netzwerk-Komplettservice (network planning, installation, security via Sonicwall, WLAN-as-a-Service), and Software/Webdesign services (custom .NET/Java development, Azure Cloud PaaS, Telegram Bots, Firmen-Wiki, KI-Lösungen/AI solutions, website design with CMS including Orchard/WordPress/TYPO3, responsive mobile design). Hardware offerings include AVM FritzBox products, Wortmann Terra PCs, and bundled Office 365 with Synology NAS packages. Additional services include free IT-Check assessments and downloadable tools like TeamViewer remote support, PingLog network monitoring, and the Orchard.HttpsCanonical CMS module. The offering functions as a full-service IT department replacement for SMEs, combining managed services with custom development and hardware procurement.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• 20–40% reduction in toner consumption through regular laser printer maintenance
• +2 more outcomes

Named customers25 records

Segments3 records

Ideal customer profiles2 records

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

AI capability2 records

Feature6 records

Partnerships

Six partnerships are on record, tiered core.

• AVMcoreTechnology or IntegrationGroßhaus GmbH is an official AVM Partner specializing in FRITZ!Box products. The partnership enables the company to offer DSL, cable, LTE, LAN, WLAN, and All-IP solutions including ISDN PBX integration, analog phone support, fax2mail, and email-based answering machine notifications. The company recommends the FRITZ!Box 7490 for its versatility in handling legacy ISDN and analog devices alongside modern All-IP connections.
• Wortmann TerracoreTechnology or IntegrationGroßhaus GmbH is an official Service Partner for the Wortmann Terra PC series. The partnership provides access to business-grade PCs tailored for office, home-office, and field use. The company offers selection advice, configuration, and troubleshooting support, using only original replacement parts to ensure reliability.
• SonicwallcoreTechnology or IntegrationGroßhaus GmbH exclusively deploys Sonicwall hardware solutions for network security across all customer installations. Sonicwall provides next-generation firewall, intrusion prevention, VPN, WAN optimization, anti-spam, and anti-malware capabilities. The company has used Sonicwall for years, citing favorable price-to-performance ratio and continuous product development.
• Microsoft (Azure, Office 365)coreTechnology or IntegrationGroßhaus GmbH develops solutions on Microsoft Azure Platform as a Service and resells/configures Office 365 Business Premium as part of its digital office package. The company leverages Azure Active Directory for centralized identity management, Azure PaaS for scalable application hosting, and offers complete Office 365 migration and deployment services including data migration and user training.
• SynologycoreTechnology or IntegrationSynology NAS systems are a core component of the company's digital office package. Synology NAS provides secure local data storage, automated backup, IP camera integration, multimedia server, web hosting, and cloud gateway capabilities. The company offers bundled Office 365 + Synology NAS packages with installation, configuration, data backup setup, training, and ongoing support.
• TeamViewercoreTechnology or IntegrationTeamViewer is the primary remote support tool used by the company's technicians. The company provides pre-configured TeamViewer downloads for customers to enable controlled, secure remote maintenance without exposing the customer's IP address. Remote support via TeamViewer allows fast resolution of most issues without a physical site visit.

Scale indicators4 records

Recent moves6 records

Expansion highlights5 records

Direct peers

• DATAGROUP SE: German IT outsourcing and managed services firm operating regional service centers across Germany, including in the Rhine/Ruhr area. Closely comparable operating model (CORBOX-style outsourced IT for SMEs/regional enterprises) with Greater scale and public reporting.
• Ratiodata GmbH: German IT system house specializing in managed services, datacenter, and workplace IT for SMEs and financial/public sector customers. Comparable target customer profile (including Sparkasse/financial references, similar to Großhaus's Stadtsparkasse Krefeld customer).
• GOB Software & Systeme GmbH & Co. KG: German IT system house in the Münsterland/lower Saxony region offering managed services, custom development (.NET), and Microsoft-based solutions to SMEs. Closely comparable in size, structure, and Mittelstand SMB focus to Großhaus.
• SIEVERS-SNC IT-Services GmbH & Co. KG: Lower Saxony–based German IT system house delivering managed services, hardware, and customized solutions to SME and mid-market customers. Directly comparable in regional SMB model, vendor stack, and full-service IT department-replacement offering.
• SVA System Vertrieb Alexander GmbH: German IT system house providing managed services, infrastructure, and software development to mid-market and enterprise customers. Closely comparable in offering mix (managed services, custom dev, vendor partnerships) to Großhaus, though at significantly larger scale.

Emerging players

• acmeo GmbH: German cloud distributor and managed services enabler targeting SMB MSPs with procurement, cloud, and recurring services. Comparable to Großhaus on the SMB managed IT / cloud services axis but operates as a distributor rather than a system integrator.

Broad incumbents

• Computacenter plc: UK-headquartered but with major German operations, Computacenter provides enterprise managed services, workplace, security, and infrastructure support. Comparable business model and vendor stack (Microsoft, Cisco-style networking), though serving much larger customers than Großhaus's SMB base.
• CANCOM SE: German managed services and cloud transformation provider with strong Microsoft Azure and Workplace focus. Directly comparable to Großhaus on the Microsoft 365 / Azure / managed services axis, though at much larger scale and with national reach.
• Bechtle AG: Largest German IT system house and MSP, offering managed services, hardware/software resale, and IT solutions across all of Germany and Europe. Overlaps with Großhaus on IT-Service, hardware resale (Fujitsu/Wortmann tier), and managed support, but operates at vastly larger scale and broader geographic reach.
• Allgeier SE: German IT services group covering managed services, software development (.NET/Java-style legacy modernization), and enterprise solutions. Similar service mix to Großhaus but operating at group level with multiple subsidiaries.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/profile.php

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

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 Großhaus