KSG

What KSG does

KSG (Kreiswohnungsbau- und Siedlungsgesellschaft mbH Siegen) is a municipal housing company headquartered in Siegen, Germany, wholly owned by the district of Kreis Siegen-Wittgenstein and its member municipalities. Founded in 1949 and registered as a GmbH under HRB 1133, it operates a unified portfolio of (i) residential rental of approximately 1,565 apartments across 273 buildings, including publicly subsidized units priced at €6.50-€7.55/m²; (ii) WEG property-owner association management covering ~70 communities and ~1,000 unit owners; (iii) third-party Mietfremdverwaltung for private and institutional landlords; (iv) brokerage; and (v) guest apartments, all concentrated in the Siegerland region from Hilchenbach to Burbach. A social-management and senior-housing dimension is built into the operating model, with barrier-free units in Burbach, Netphen-Dreis-Tiefenbach, and Siegen-Weidenau, and a dedicated Quartiersentwicklung function added in 2025.

The operational technology stack is deliberately modest: a WordPress website with Casavi as the tenant portal (rated 4.1/5, ~44% tenant registration), Google Analytics and self-hosted WP Statistics for traffic analytics, and ConsentManager, Complianz, and Friendly Captcha for GDPR-compliant consent and bot protection. Digital engagement is augmented by Facebook, Instagram, and LinkedIn channels, a bi-annual tenant magazine 'KSG wohnen aktuell' (transitioning fully online from 2026), and the company's website as the primary lead-generation surface. There is no AI/ML component to the platform, no external-facing API, and no native mobile app.

Revenue is generated through Netto-Kaltmieten on the owned housing stock, recurring WEG-Verwaltung and Mietfremdverwaltung management fees, brokerage commissions on residential transactions, guest-apartment rental income, and an emerging stream of social-infrastructure (Kindergarten / Kita) real-estate development. Growth-oriented capital expenditure (€7.85M Alte Filzfabrik, €2.5M Kita Sonnenfänger, plus additional Kita builds at Birkenweg and Aue-Wingeshausen) is materially de-risked through subsidies from NRW.BANK's 'Öffentliches Wohnen 2024-2027' program and KfW financing for KfW-40 energy-efficient new construction.

Name

KSG

Legal name

Kreiswohnungsbau- und Siedlungsgesellschaft mbH Siegen

Website

https://ksg-siegen.de

Company type

Private

Founded year

1949

Operating status

Operating

Headcount range

11–50 employees

Short description

KSG (Kreiswohnungsbau- und Siedlungsgesellschaft mbH Siegen) is a municipal housing company owned by Kreis Siegen-Wittgenstein that rents ~1,565 apartments, manages ~70 homeowner associations with ~1,000 units, and provides brokerage and social-infrastructure real-estate services across the Siegerland region of Germany.

Ownership category

akta.pro rank

Product category

Municipal Housing & Property Management Services

NAICS

Residential Property Managers (531311)

SIC

Real Estate Agents & Managers (For Others) (6531)

akta.pro industry

PRIMARYBPAJAFAB

Single-Family Rental (SFR) Property Management

Business & Public Services/Real Estate Services (Brokerage, Property Management)/Residential Property Management

Keywords

• Municipal housing
• Property management
• Apartment rental
• WEG administration
• Affordable housing

Headquarters

HQ city

Siegen

HQ country

Germany

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B and B2C

Offering type

Services

Cost components

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

Revenue model

1. Residential Rental Income: KSG generates primary revenue from renting out its own residential properties (over 1,500 apartments) to tenants across the Siegerland region, from single rooms to family homes.
2. WEG Property Management: Property management services for approximately 1,000 unit owners across 70 homeowner associations (WEG-Verwaltung), as well as rental property management for private and institutional investors.
3. Brokerage Services: Real estate brokerage services for buyers and sellers in the Kreis Siegen-Wittgenstein area (Maklertätigkeiten).
4. Guest Apartments: Short-term rental of guest apartments for tenants' visitors (Gästewohnungen).

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels6 records

Core offering

KSG is a municipal housing company that rents out its own portfolio of approximately 1,565 apartments across 273 buildings in the Siegen-Wittgenstein district, offers professional WEG (homeowner association) administration for about 70 owner communities (~1,000 owners), provides third-party rental management for private and institutional property owners, and brokers real estate transactions. The company also operates guest apartments, senior-friendly housing, and develops social infrastructure including daycare facilities.

Product overview

KSG (Kreiswohnungsbau- und Siedlungsgesellschaft mbH Siegen) is a municipal housing company serving Siegen-Wittgenstein district since 1949. The company operates a unified portfolio of housing and property management services, including rental of ~1,500 apartments (1-4 rooms, subsidized and market-rate), WEG management for ~70 owner communities (~1,000 owners), third-party rental management, and brokerage services. The portfolio includes specialized offerings: senior-friendly housing (Burbach, Netphen-Dreis-Tiefenbach, Siegen-Weidenau), guest apartments, and childcare facilities (Kita). Recent additions include an online tenant portal (Casavi), social management services (Quartiersentwicklung), and energy-efficient solutions (PV systems, heat pumps). The company develops new construction projects including the Alte Filzfabrik subsidized housing development. Key digital touchpoints include the Casavi tenant portal, customer login area, and dedicated senior housing website section.

Differentiator

Problem solved

Functional benefit

Products and services

• Wohnungsvermietung (Apartment Rental) Rental of apartments ranging from 1-room units to single-family homes for singles, single parents, couples, and families. Properties located across the Siegen-Wittgenstein district from Hilchenbach to Burbach, Freudenberg to Erndtebrück. Some apartments publicly subsidized requiring housing eligibility certificate.
• WEG-Verwaltung (Homeowner Association Management) Management of residential property ownership associations (WEG) following the German Wohnungseigentumsgesetz. Services include administrative, technical, and financial management for approximately 1,000 property owners across 70 owner communities.
• Mietfremdverwaltung (Third-Party Rental Management) Property management services for individual property owners and institutional investors renting apartments in Siegen and surrounding areas. Comprehensive administration for rental properties.
• Maklertätigkeiten (Real Estate Brokerage) Real estate brokerage services for buyers and sellers of residential properties in the Siegen-Wittgenstein district and neighboring regions.
• Gästewohnungen (Guest Apartments) Furnished guest apartments available for rent by tenants visiting family or friends. Modernized units including Bismarckstraße 50b with contemporary furnishings and amenities.
• Einzeldienstleistungen (Individual Property Services) Individual management services for small property owner communities and private landlords, offering flexible service packages beyond full management.
• Seniorengerechtes Wohnen (Senior-Friendly Housing) Barrier-free senior housing in Burbach, Netphen-Dreis-Tiefenbach, and Siegen-Weidenau. Features include elevators, wheelchair-accessible units, ground-level showers, and proximity to care services. Dedicated contact person for senior inquiries.
• Sozialmanagement (Social Management & Community Development) Social work and neighborhood development services including counseling, senior home visits, community events, breakfast meetings, and networking with local institutions. Coordinated by social worker Tanja Gutbier across multiple locations as part of Quartiersentwicklung (community development).

Quantifiable outcome

• Over 1,500 tenants served across 273 buildings and 1,565 apartments
• +1 more outcomes

Named customers1 record

Segments4 records

Ideal customer profiles5 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration11 records

Partnerships

Five partnerships are on record, tiered core.

• Bernshausen Bau GmbH & Co. KGcoreImplementation/ SI/ Consulting Partner · 1 July 2025Construction company executing the Alte Filzfabrik project in Hilchenbach-Allenbach. Located in Bad Laasphe.
• Berge-BaucoreImplementation/ SI/ Consulting Partner · 1 January 2024Construction company executing the Kita 'Sonnenfänger' project in Bad Berleburg. Located in Erndtebrück.
• DRK-Kreisverband Siegen-WittgensteincoreOthersGerman Red Cross local chapter acting as operator of the Kita 'Sonnenfänger' in Bad Berleburg Espeweg.
• AWO Kreisverband Siegen-Wittgenstein/OlpecoreOthersArbeiterwohlfahrt local chapter acting as operator of new daycares in Eiserfeld Birkenweg and Aue-Wingeshausen.
• Entwicklungsgesellschaft Alte Filzfabrik mbHcoreStrategic or Co-development PartnerDeveloper of the former industrial site 'Alte Filzfabrik' in Hilchenbach-Allenbach. Site was developed and handed over to KSG for housing construction.

Scale indicators7 records

Recent moves14 records

Expansion highlights5 records

Broad incumbents

• Deutsche Wohnen SE: Major German residential property company focused on urban apartments. Comparable portfolio composition (German multifamily rental), though different scale and predominantly urban versus KSG's regional footprint.
• Vonovia SE: Germany's largest listed residential property company (formerly Deutsche Annington) managing ~500,000+ units nationwide. Directly comparable to KSG as both operate German residential rental portfolios, though at vastly different scale, geographic breadth, and listing status.
• LEG Immobilien SE: NRW-based listed residential property manager with ~165,000 units. Directly comparable given the regional overlap with KSG's Siegen-Wittgenstein operating geography and similar focus on affordable/mid-market German rental housing.

Direct peers

• Nassauische Heimstätte | Wohnstadt: State-owned Hessian housing company with a kommunal/social mandate, similar to KSG's structure. Comparable business model combining owned residential portfolio, WEG-Verwaltung, and new construction with public-mission orientation.
• Siedlungswerk GmbH: Catholic-affiliated non-profit housing company in Baden-Württemberg managing ~20,000 units. Compares on social-mission housing, mid-sized portfolio scale, and mixed rental/WEG-Verwaltung service offerings similar to KSG.
• Vivawest GmbH: NRW municipal/union-affiliated housing company managing ~120,000 units. Strong peer match given shared kommunales Wohnungsunternehmen structure, social-mission focus, energy-efficient modernization programs, and NRW regional overlap.
• Bauverein AG: Regional German municipal housing company providing subsidized and market-rate rental housing. Closely matches KSG in scale (~thousands of units, regional single-Kreis scope) and kommunale ownership structure.

Others

• Casavi GmbH: Tenant portal platform already deployed by KSG. While not a direct competitor, comparable as a PropTech provider whose customer success and product roadmaps directly affect KSG's digital service capability.

Regional players

• GEWOBA Nord Wohnungsbau GmbH: Northern German municipal housing company. Comparable kommunale structure and rental-portfolio focus though serving a different regional market; useful benchmark for evaluating municipal housing company economics.
• Allgeier Wohnungsbau GmbH: Mid-sized German residential property developer and manager. Comparable regional-municipal focus on new construction and rental management, providing a benchmark for smaller-scale German housing company operating models.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/people/KSG-Siegen/100080691913739
• LinkedInlinkedin.com/company/ksg-siegen-mbh
• Instagraminstagram.com/ksg_siegen

Compliance3 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 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 KSG