Solid Modulbau

What Solid Modulbau does

Solid Modulbau GmbH is a German modular construction company founded in 2016 and headquartered in Ahaus, North Rhine-Westphalia. The company designs, prefabricates, and delivers turnkey residential, commercial, and healthcare buildings using a proprietary hybrid modular system that combines concrete and wood components. Its customers are primarily municipalities, housing cooperatives (Genossenschaften), social housing providers, commercial real estate developers, healthcare operators, and individual investors located across at least seven German states including North Rhine-Westphalia, Lower Saxony, Hamburg, Baden-Württemberg, Rhineland-Palatinate, and Saarland.

The company's core offering is the Hybrid-Modulbau system, built around its proprietary Smartbeton (smart concrete) technology that enables 30–60% material savings, 100% recyclability, and separation of load-bearing structure from building envelope for flexible repurposing. Delivered buildings achieve KfW-40 to KfW-40-Plus energy standards and integrate infrared ESHC heating, decentralized heat-recovery ventilation (>90% efficiency), photovoltaic systems, BIM-based 5D planning, and a proprietary Smart-Home system controlling blinds, lighting, heating, ventilation, door communication, and EV charging. Complementary product lines include the Solid.box tiny-house range (seven models, 23–108 m²) and Sonnenhaus buildings targeting 50–80% energy autarky without fossil-fuel technology.

Solid Modulbau earns revenue primarily through one-time project-based construction contracts, supplemented by long-term managed-service maintenance agreements and direct sales of Solid.box tiny houses. Pricing is quote-based and project-specific, with the company marketing guaranteed budget adherence and up to 50% reduction in planning and execution time versus conventional construction. Go-to-market combines enterprise field sales, competition wins (Wettbewerbe) — particularly under the GdW framework agreement where Solid Modulbau is the only provider offering KfW-40-Plus standard — and direct inquiries via its website. The firm has approximately 20 employees, is expanding production capacity with a new facility planned within 24 months, and is led by Managing Director Hermann Stegink.

Name

Solid Modulbau

Legal name

Solid.Modulbau GmbH

Website

https://solid-modulbau.de

Company type

Private

Founded year

2016

Operating status

Operating

Headcount range

1–10 employees

Short description

Solid Modulbau is a German modular construction company founded in 2016 that designs, prefabricates, and delivers turnkey sustainable residential, commercial, and healthcare buildings using proprietary Smartbeton and hybrid concrete-wood technology for municipalities, housing cooperatives, developers, and healthcare operators across Germany.

Ownership category

akta.pro rank

Product category

Modular Construction

NAICS

Prefabricated Wood Building Manufacturing (321992), New Multifamily Housing Construction (except For-Sale Builders) (236116), Nonresidential Building Construction (2362)

SIC

Prefabricated Wood Bldgs & Components (2452), General Bldg Contractors - Residential Bldgs (1520), General Bldg Contractors - Nonresidential Bldgs (1540)

akta.pro industry

PRIMARYIMAFABAF

Residential Modular & Prefabricated Home Construction

Industrials, Manufacturing & Construction/Construction & Civil Engineering/Residential Building Construction

SECONDARYIMAFAAAK

Modular/Offsite General Contracting & Installation

Industrials, Manufacturing & Construction/Construction & Civil Engineering/General Contracting & Construction Management

SECONDARYIMAFABAH

Residential Green / High-Performance Home Construction (Net-Zero, Passive House)

Industrials, Manufacturing & Construction/Construction & Civil Engineering/Residential Building Construction

Keywords

• Modular construction
• Prefabricated buildings
• Hybrid building systems
• Residential modular housing
• Sustainable construction

Headquarters

HQ city

Ahaus

HQ country

Germany

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Modular Building Construction - Residential: Design, fabrication, and turnkey delivery of prefabricated modular residential buildings including multi-family housing, senior living facilities, and care homes. Revenue is project-based with comprehensive services from planning through handover.
2. Modular Building Construction - Commercial: Construction of commercial modular buildings including office spaces, hotels, motels, and retail facilities. Includes specialized solutions like fully furnished hotel rooms and drive-in facilities.
3. Building Maintenance and Service Contracts: Long-term building service contracts for technical and structural maintenance, providing recurring revenue from completed projects.
4. Tiny Houses (Solid.box Product Line): Seven tiny house models ranging from 25-100 sqm for living, working, vacation, or commercial use, sold through dedicated subsidiary solid-box.net.

Pricing tiers

Go-to-market motion3 records

Distribution channels4 records

Marketing channels9 records

Core offering

Solid.Modulbau designs, prefabricates in factory conditions, and delivers turnkey modular residential and commercial buildings using its proprietary Smartbeton concrete and Hybrid-Modulbau (concrete-wood hybrid) construction systems. The company provides complete project delivery from initial concept and BIM-based planning through on-site assembly and handover, with buildings meeting KfW-40 and KfW-40-Plus energy efficiency standards. Products span multi-family housing, senior and care facilities, commercial spaces, and a Solid.box tiny house product line (25-100 sqm).

Product overview

Solid.Modulbau is a modular construction company offering prefabricated residential and commercial buildings through its core Hybrid-Modulbau system. The product portfolio includes Solid.box (tiny houses), Sonnenhäuser (energy-efficient sun houses), and commercial modular buildings. Key proprietary technologies include Smartbeton (sustainable concrete) and a Smart-Home-System. Buildings achieve KfW-40 to KfW-40 Plus energy standards with up to 80% energy autarky. The company provides complete solutions from planning to turnkey handover.

Differentiator

Problem solved

Functional benefit

Brands

• Solid.box: Tiny houses product line - modular small houses from 25-100 square meters for living, working, holidays, or commercial use. Represented by Florian Stemmer. Website: solid-box.net
• Sonnenhäuser (Sun Houses)

Products and services

• Hybrid-Modulbau (Hybrid Modular Construction) Signature hybrid modular construction system combining concrete and wood materials strategically based on application requirements. Achieves CO2 reductions of over 50% compared to conventional construction while delivering up to 80% reduction in on-site construction time and 50% faster total project completion. Used for residential and commercial buildings for developers, municipalities, and housing cooperatives in Germany.
• Beton-Modulbau (Concrete Modular Construction) Concrete-based modular construction method for residential and commercial buildings. Delivers energy-efficient buildings (KfW-40 and KfW-40 Plus standards) with the durability and earth-contact performance of concrete.
• Elementiertes Bauen (Element-Based Construction) Modular element-based construction for residential and commercial projects offering faster build times than conventional construction with predictable costs.
• Sonnenhäuser (Sun Houses) Energy-efficient building concept using 100% regenerative energy carriers, achieving 50-80% energy autarky through integrated photovoltaic systems, infrared heating, and demand-controlled ventilation with heat recovery. Delivered without fossil fuel heating technology.
• Solid.box (Tiny Houses Product Line) Product line of seven modular tiny house models ranging from approximately 25 to 100 square meters (website cites 23-108 sqm) for living, working, vacation, or commercial use. Built with the innovative Hybrid-System and delivered with full prefabrication including interior fit-out and technical building equipment. Sold directly to individuals across Germany through solid-box.net.
• Lückenbebauung (Gap-Infill Construction)

Quantifiable outcome

• Up to 80% reduction in on-site construction time through prefabrication
• +7 more outcomes

Named customers7 records

Segments5 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature6 records

Partnerships

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

• DGNB (Deutsche Gesellschaft für Nachhaltiges Bauen)coreStrategic or Co-development PartnerPartnership with German Sustainable Building Council for certification and sustainability expertise in modular construction projects.
• Bundesverband Bausysteme (Federal Association of Building Systems)coreStrategic or Co-development PartnerMembership in federal association representing building system providers, advocating for modular and serial construction.
• IG Infrarot (Infrared Technology Association)coreTechnology or IntegrationPartnership for infrared heating technology expertise and implementation in modular buildings.
• HDH Ingenieure (Engineering Firm)minorImplementation/ SI/ Consulting PartnerEngineering partnership for structural and technical building planning.
• CEWI (Circular Economy Innovation Project)coreStrategic or Co-development PartnerActive participant in CEWI circular economy initiative alongside Stiftung 2°, WWF, Federal Ministry for Environment, and Wuppertal Institute. Company demonstrates how KfW-40 buildings serve as key strategy for climate-neutral, resource-efficient economy through modular construction.
• DBU (Deutsche Bundes Umweltstiftung)coreStrategic or Co-development PartnerResearch partnership with German Federal Environmental Foundation for developing sustainable modular construction methods, including hybrid wood-concrete approach.
• TU Dortmund - Fachbereich ArchitekturcoreStrategic or Co-development PartnerAcademic partnership with Technical University of Dortmund's Architecture department for research on sustainable building methods.
• IAB Weimar (Institut für angewandte Bauforschung)coreStrategic or Co-development PartnerPartnership with Institute for Applied Building Research for scientific validation and development of modular construction techniques.
• GdW (German Housing Association)flagshipStrategic or Co-development PartnerFramework agreement partner and GdW competition winner (twice). Only framework agreement providing KfW-40-Plus standard for sustainable social housing.

Scale indicators13 records

Recent moves7 records

Expansion highlights5 records

Others

• DGNB (Deutsche Gesellschaft für Nachhaltiges Bauen): German Sustainable Building Council — Solid.Modulbau is a partner and benefits from DGNB certification positioning, making it an enabling ecosystem participant rather than a competitor.
• GdW (Bundesverband deutscher Wohnungs- und Immobilienunternehmen): Germany's largest housing association — Solid.Modulbau is a framework agreement partner via GdW competitions, making it a key customer/channel partner rather than a direct competitor.

Direct peers

• ALHO Systembau GmbH: German modular building manufacturer producing factory-prefabricated steel/concrete modules for housing, education, healthcare, and offices — competes head-to-head with Solid.Modulbau in turnkey modular construction for German housing cooperatives and municipalities.
• Kleusberg GmbH & Co. KG: One of Germany's largest modular construction specialists serving residential, commercial, educational, and healthcare clients with factory-prefabricated buildings — direct competitor to Solid.Modulbau across multifamily, care, and commercial segments in Germany.
• Cadolto Modulbau GmbH: Specialist in factory-built modular buildings (hotels, hospitals, residential) using a high degree of prefabrication — comparable technology approach and customer profile to Solid.Modulbau's hybrid modular buildings.
• FAGSI Vertriebs- und Service GmbH: Provides modular container-based buildings for residential, educational, and commercial use in Germany — comparable prefab construction method and German customer base to Solid.Modulbau.
• Zeppelin Rental GmbH (Container-/Modularbau): Operates a significant modular/container building business for schools, offices, and housing across Germany — competes with Solid.Modulbau on speed, scalability, and price for prefab temporary and permanent building solutions.

Emerging players

• WeberHaus GmbH & Co. KG: One of Germany's largest prefabricated single-family home builders with significant prefab/modular capabilities — overlaps with Solid.Modulbau's Solid.box tiny-house line and broader residential prefab market.
• Bien-Zenker AG: Major German prefabricated home manufacturer with a focus on sustainable, energy-efficient residential construction — adjacent competitor in the prefab/sustainable building space where Solid.Modulbau competes.

Broad incumbents

• GOLDBECK GmbH: Large established German construction company with a strong systems/modular product line for commercial, logistics, and increasingly residential builds — broader portfolio but overlapping modular multifamily and commercial project space.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Facebookfacebook.com/solidmodulbau
• LinkedInlinkedin.com/company/solidmodulbau
• Instagraminstagram.com/solidmodulbau

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 records

Subsidiaries1 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 Solid Modulbau