DIPL. ING. WILHELM SEDLAK GESELLSCHAFT M. B. H.

What DIPL. ING. WILHELM SEDLAK GESELLSCHAFT M. B. H. does

DIPL. ING. WILHELM SEDLAK GESELLSCHAFT M. B. H. is a Vienna-based, privately held construction company and real estate developer operating across four integrated service pillars: Bauen (general construction covering residential, commercial, and specialized buildings such as hospitals and laboratories), Instandhaltung & Sanierung (maintenance, renovation, and heritage restoration), Planung (BIM-based integral planning as general or total contractor), and Immobilien- & Standortentwicklung (real estate development through wholly-owned Sedlak Immobilien GmbH). Founded in 1945 and employing approximately 270 people across the corporate group, the firm serves individual property buyers, institutional clients (healthcare and education), property managers, and real estate investors, primarily in Vienna and Lower Austria.

The company's underlying technology stack centers on Building Information Modeling (BIM) for integral planning, Lean Construction methodology implemented via weekly Last Planner System workshops, and proprietary tools including the IMMOSCAN inspection software certified to ÖNORM B 1300/1301 and the GreenLine sustainability standard. It co-founded Smart Construction Austria in 2019 and acquired a co-shareholding in SCALE GmbH in July 2023 to embed sustainability consulting and EU Taxonomy-aligned advisory into project delivery, exemplified by the 2023 Van der Nüll Gasse 22 circular renovation pilot.

Sedlak generates revenue through a vertically integrated mix: project-based construction contracts (as general or total contractor), direct property sales and rentals through Sedlak Immobilien on a commission-free developer-direct basis, recurring technical building services for property managers and institutional investors, and certified property inspection services via IMMOSCAN. The firm holds ISO 37001, ISO 37301, and ISO 14001 certifications and pursues ÖGNI/DGNB Gold building certifications. Distribution is purely direct, with sales offices and a construction yard all located within Vienna's 10th district.

Name

DIPL. ING. WILHELM SEDLAK GESELLSCHAFT M. B. H.

Legal name

Dipl. Ing. Wilhelm Sedlak Gesellschaft m.b.H.

Website

https://sedlak.co.at

Company type

Private

Founded year

1945

Operating status

Operating

Headcount range

1–10 employees

Short description

Dipl. Ing. Wilhelm Sedlak is a Vienna-based, privately held construction company and real estate developer founded in 1945, employing ~270 people across construction, BIM-based planning, maintenance, and developer-direct property sales. It serves residential buyers, institutional clients, and property managers primarily in Austria.

Ownership category

akta.pro rank

Product category

Construction and Real Estate Development

NAICS

Residential Remodelers (236118), New Housing For-Sale Builders (236117), Nonresidential Building Construction (2362)

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

Systems Engineering & Technical Program Management (BPAHAIAI), Mixed-Use Property Management (BPAJAGAE)

Keywords

• Construction services
• Real estate development
• BIM-based planning
• Building renovation
• Property inspection

Headquarters

HQ city

Vienna, Vienna

HQ country

Austria

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Construction Services: General construction and specialized construction services for residential, commercial, and industrial buildings. Revenue generated through project-based contracts as main contractor (Generalunternehmer) or Totalunternehmer.
2. Real Estate Development (Bauträger): Property development and sales through Sedlak Immobilien subsidiary. The company develops residential properties and sells/rents them directly to end customers without intermediaries (provisionsfrei).
3. Technical Building Services (Technisches Hausservice): Maintenance and repair services for property managers, commercial and industrial clients, and institutional investors. Small to medium construction and partial general contractor services.
4. Property Scanning Services (Immoscan): Certified property inspection services according to Austrian standards, including safety inspections, building documentation, and water meter verification.

Pricing tiers

Go-to-market motion2 records

Distribution channels3 records

Marketing channels4 records

Core offering

Dipl. Ing. Wilhelm Sedlak Gesellschaft m.b.H. is a Vienna-based construction company and real estate developer offering vertically integrated services spanning general construction (residential, commercial, and industrial buildings), maintenance and renovation, BIM-based integral planning as general or total contractor, and real estate development from land acquisition through property handover. The company operates through its subsidiaries including Sedlak Immobilien for direct property sales and rentals, GreenLine for sustainable building, Immoscan for certified property inspections, and SCALE for environmental consulting.

Product overview

DIPL. ING. WILHELM SEDLAK GESELLSCHAFT M. B. H. is a Vienna-based construction company and real estate developer operating as a unified construction-to-keys platform. The company offers four integrated service pillars: Bauen (general construction including residential, commercial, and industrial building), Instandhaltung & Sanierung (maintenance and renovation including heritage restoration), Planung (BIM-based integral planning as GU/TU contractor), and Immobilien- & Standortentwicklung (real estate development and project management). The portfolio includes proprietary service tools (Immoscan for property inspection), sustainability sub-brands (Greenline for eco-building, SCALE for environmental consulting), and Lean Construction methodology. The company also operates Sedlak Immobilien as its real estate sales and rental arm, managing residential projects across Vienna and Lower Austria.

Differentiator

Problem solved

Functional benefit

Brands

• Greenline: A sustainable and ecological construction approach with individual solutions adapted to each location. Buildings meet required minimum standards while offering a healthy home to feel comfortable in.
• Immoscan
• SCALE

Products and services

• Bauen (Construction Services) Full-service construction offering including residential housing (Wohnbau), commercial office building construction (Bürohausbau), and industrial/special construction (Industrie- & Sonderbau) for institutional clients, property developers, and government entities.
• Instandhaltung & Sanierung (Maintenance & Renovation) Building maintenance and renovation services including remodeling, thermal insulation upgrades, heritage building restoration (Denkmalschutz), and technical house services for property managers and institutional clients.
• Planung (BIM-Based Integral Planning) Integral planning services using Building Information Modeling (BIM) methodology, offered as general contractor (GU) or total contractor (TU). Covers the entire building lifecycle from concept through demolition for institutional and developer clients.
• Immobilien- & Standortentwicklung (Real Estate Development) Comprehensive real estate development from land acquisition through project completion and handover, operating as both developer (Bauträger) and project manager. Includes technical house services and property inspection services.
• Immoscan Property Inspection Service Certified property inspection service using proprietary software that conducts safety inspections according to ÖNORM B 1300/1301 standards, creates building manuals, and performs water meter inspections for property owners and managers.
• Greenline Sustainable Building Package Sedlak's proprietary sustainable building package encompassing eco-friendly construction with certified pollutant-tested materials, renewable energy systems (heat pumps, photovoltaic), circular economy principles, and biodiversity promotion in residential developments.
• Sedlak Immobilien Property Sales and Rentals Real estate development arm offering apartments for sale and rent, developed with GreenLine sustainability principles across Vienna and surrounding areas, sold directly without intermediaries (provisionsfrei).

Quantifiable outcome

• 80 years of successful business operations
• +2 more outcomes

Named customers5 records

Segments4 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• SCALE GmbHcoreStrategic or Co-development Partner · 1 July 2023SCALE GmbH is a co-shareholder entity (Mitgesellschafter) established July 2023, providing consulting and innovative solutions for sustainable planning, construction, and renovation of buildings. They support Sedlak's circular economy initiatives and the EU Taxonomy-aligned renovation projects.
• Smart Construction Austria (SCA)coreStrategic or Co-development Partner · 1 January 2019Consortium of 6 Austrian mid-sized construction companies formed in 2019 to drive digitalization and innovation in construction. Members: Hillebrand Bau GmbH (Salzburg), Handler Holding GmbH (Lower Austria), Tomaselli Gabriel Bau GmbH (Vorarlberg), Sedlak (Vienna), Wimberger Bau GesmbH (Upper Austria), RIEDERBAU GmbH (Tyrol).
• Digital Findet StadtcoreStrategic or Co-development PartnerFFG-funded innovation laboratory conceived by IG Lebenszyklus Bau and Austrian Institute of Technology, with founding partners including Austrian Association of Civil Engineers, Smart Construction Austria, and Facility Management Austria. Serves as interface between research and industry.
• WieNeu+minorGTM or Marketing PartnerVienna urban renewal program providing funding support for circular renovation pilot projects such as the Van der Nüll Gasse 22 project.

Scale indicators6 records

Recent moves6 records

Expansion highlights5 records

Broad incumbents

• Strabag SE: Austria's largest construction company with a full general contracting, civil engineering, and real estate development portfolio across Europe. Comparable as a broad incumbent general contractor operating in the same Austrian market, though far larger and more diversified than Sedlak.
• Porr AG: Major Austrian general contractor with significant residential, commercial, and infrastructure construction plus real estate development. Closely comparable in vertical integration (build + develop) and Austrian geographic focus, but at substantially larger scale.

Direct peers

• Granit Group: Austrian construction and real estate group operating general contracting and development services. Comparable as a private Austrian construction-and-development peer serving residential and commercial segments.
• Swietelsky Baugesellschaft m.b.H. Privately-held Austrian general contractor and developer operating across residential, commercial, and infrastructure projects in Austria and CEE. Most directly comparable mid-to-large Austrian mid-market peer with similar integrated construction-and-development model.
• Hillebrand Bau GmbH: Salzburg-based general contractor and developer, also a Smart Construction Austria founding member. Direct comparable on regional mid-sized integrated construction plus property development in Austria.
• Wimberger Bau GesmbH: Upper Austrian general contractor and developer, fellow Smart Construction Austria consortium member with Sedlak. Direct peer on mid-sized integrated construction and real estate development in the Austrian market.
• RIEDERBAU GmbH: Tyrolean general contractor and developer, Smart Construction Austria founding member with Sedlak. Direct comparable Austrian mid-sized peer combining general contracting with property development.
• Handler Holding GmbH: Lower Austrian general contractor and developer, Smart Construction Austria founding member. Direct comparable as regional Austrian mid-market construction company with integrated developer arm.
• Tomaselli Gabriel Bau GmbH: Vorarlberg-based general contractor and developer, fellow Smart Construction Austria founding member alongside Sedlak. Direct regional mid-sized peer in Austrian integrated construction-and-development.
• Leyrer + Graf Baugesellschaft m.b.H. Privately-held Austrian general contractor active in commercial, industrial, and residential construction across Lower Austria and Vienna. Comparable mid-market peer with similar regional Austrian construction focus.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat5 records

Key risks5 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/dipl.-ing.-wilhelm-sedlak-gesellschaft-m.-b.-h.

Compliance5 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Subsidiaries2 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 DIPL. ING. WILHELM SEDLAK GESELLSCHAFT M. B. H.