Karl und Bremhorst Architekten

What Karl und Bremhorst Architekten does

Karl und Bremhorst Architekten ZT GmbH is a privately held Austrian architecture firm headquartered at Linke Wienzeile 4 in Vienna, registered as a Ziviltechniker-GmbH and led by founding partners Christoph Karl and Andreas Bremhorst. The firm provides architectural and general-planning services across five practice areas: Culture/Education/Sports, Health and Social (senior care), Offices and Administration, Industry/Trade, and Residential/Urban Planning. Its core technical differentiator is the design of sustainable, energy-efficient and in several cases plus-energy or near-energy-autonomous buildings, achieved through integrated combinations of geothermal, photovoltaic, solar-thermal, and building-component activation systems.

The firm's revenue model is professional-services fees for architectural design and general planning, sourced from project-based commissions won either through architectural competitions (EU-wide open and invited) or via direct negotiation with public and private clients. Customer mix is heavily weighted toward Austrian public-sector and quasi-public entities (Stadt Wien via MA51, Stadt Wien education department, KWP, GWG Linz, Pensionsversicherungsanstalt, Wirtschaftskammer Salzburg, GEWOG, Sozialbau AG) with a smaller roster of private enterprise clients (Raiffeisen Bank, TIGER Coatings). Notable delivered projects include Sport Arena Wien (completed 2025, 13,600 m², klimaaktiv Gold 948/1,000 points), Bildungscampus Liselotte Hansen-Schmidt (2021, ~1,400 students, near-energy-autonomous), Sporthalle Liefering (Austria's first plus-energy sports hall), and Tourismusschule Klessheim Salzburg.

Distribution is direct: competition entries, negotiated procedures, and invitations from Austrian municipalities and corporate clients. Marketing is conducted through a project portfolio website (kub-a.at), LinkedIn and Instagram channels, earned media in architecture publications (Architektur Aktuell), and active participation in industry events (TURN ON Architekturfestival, Architekturtage). The firm has accumulated a concentrated cluster of 2025–2026 accolades including klimaaktiv Gold, Österreichischer Solarpreis 2025, Aluminium-Architektur-Preis 2025, best architects 27 Award, and a Bauherr:innenpreis 2026 nomination, predominantly tied to the Sport Arena Wien as signature reference.

Name

Karl und Bremhorst Architekten

Legal name

Karl und Bremhorst Architekten ZT GmbH

Website

https://kub-a.at

Company type

Private

Operating status

Operating

Headcount range

1–10 employees

Short description

Karl und Bremhorst Architekten is a Vienna-based Austrian architecture firm specializing in sustainable, energy-efficient public buildings — including education campuses, sports venues, senior care facilities, and housing — delivered via architectural competitions and direct commissions for Austrian public-sector and private clients.

Ownership category

akta.pro rank

Product category

Architecture Services

NAICS

Architectural Services (541310), Architectural Services (54131), Interior Design Services (54141), Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Architectural Design Services (BPAHAKAA)

akta.pro secondary industries

Urban Planning & Master Planning (BPAHAKAD), Interior Design Services (BPAHAKAB), Senior Living & Assisted Living Facility Construction (IMAFACAJ), Residential Luxury / High-End Home Construction (IMAFABAJ)

Keywords

• Sustainable architecture services
• Public building design
• Energy-efficient architecture
• Architectural competition design
• Urban and residential planning

Headquarters

HQ city

Vienna

HQ country

Austria

HQ region

Europe

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Architecture and planning services: The firm generates revenue through fees for architectural design, general planning (Generalplanerleistung), and associated professional services on construction projects. Revenue comes from public sector clients (cities, municipalities, government agencies) and private developers through project-based commissions won via competitions or direct awards.

Go-to-market motion2 records

Distribution channels3 records

Marketing channels6 records

Core offering

Karl und Bremhorst Architekten provides architectural and general planning services for sustainable public and private buildings. Its portfolio spans five service areas: cultural, educational and sports facilities; healthcare and senior-care facilities; offices and administration; industrial and commercial buildings; and residential buildings and urban planning. The firm is engaged via architectural competitions (EU-wide open and invited) or direct commissions from public-sector clients, housing associations, healthcare operators, and private corporations.

Product overview

Karl und Bremhorst Architekten ZT GmbH is an Austrian architectural firm (ZT = Ziviltechniker, civil engineer) based in Vienna. The firm operates as a single unified practice offering architectural and urban planning services rather than a software product company. Their portfolio is organized into five service categories: Kultur/Bildung/Sport (Culture/Education/Sports), Gesundheit und Soziales (Health and Social), Büros und Verwaltung (Offices and Administration), Industrie und Gewerbe (Industry and Trade), and Wohnbauten und Städtebau (Residential Buildings and Urban Planning). The firm has delivered notable projects including Sport Arena Wien, Bildungszentrum Pregarten, Tourismusschule Klessheim Salzburg, multiple senior care facilities, educational campuses, and residential complexes across Austria. The practice emphasizes sustainability, energy-efficient design, and barrier-free architecture, with recent recognition including klimaaktiv Gold certification, Solarpreis 2025, and best architects 27 Award for the Sport Arena Wien.

Differentiator

Problem solved

Functional benefit

Products and services

• Kultur, Bildung und Sport (Culture, Education and Sports) Architectural and general planning services for cultural, educational, and sports facilities — including schools, kindergartens, universities, sports arenas, and multi-purpose halls — delivered to public-sector clients, private schools, and sports organizations.
• Gesundheit und Soziales (Health and Social) Architectural design services for healthcare and social facilities including nursing homes, senior centers, care facilities, and residential care buildings, typically delivered to non-profit operators and municipalities.
• Büros und Verwaltung (Offices and Administration)

Quantifiable outcome

• Sport Arena Wien achieved 948 of 1,000 possible points in klimaaktiv certification with maximum points in energy category
• +2 more outcomes

Named customers10 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

Feature3 records

Partnerships

Four partnerships are on record, tiered core and minor.

• Sozialbau AG WiencoreStrategic or Co-development Partner · 1 January 2025Joint partnership in Bauträgervergabeverfahren for Häuser zum Leben project, winning 1st prize for development of Haidehof and Maria Jacobi nursing home and residential complexes in Vienna.
• Delta PodsedensekminorImplementation/ SI/ Consulting Partner · 1 January 2021Architecture joint venture (ARGE) for PVA Wien general renovation project combining architectural expertise.
• Schoch2 ZT-GmbH / KWI EngineersminorImplementation/ SI/ Consulting Partner · 1 January 2016Architecture joint venture (Arge) for Haus Penzing general renovation project combining architecture and engineering expertise.
• Woschitz EngineeringminorStrategic or Co-development Partner · 1 January 2012Architecture joint venture (Arge) partner for Cluster Testbase project, combining architectural and engineering services.

Scale indicators3 records

Recent moves5 records

Expansion highlights5 records

Emerging players

• BIG (Bjarke Ingels Group): Danish-headquartered firm known for sustainability-forward public, educational, and sports facilities. Comparable on the plus-energy / sustainable architecture positioning relevant to klimaaktiv-style programs, though at much greater scale and international reach.
• Snøhetta: Norwegian-rooted practice with strong sustainability credentials and a portfolio spanning cultural, educational, and public buildings across Europe. Compares on its sustainability positioning and EU-wide competition wins, though at significantly larger scale.
• 3XN / GXN: Danish architecture firm with strong portfolio in sports, education, and cultural buildings emphasizing sustainability. Comparable through its European competition-winning public projects and sustainability emphasis.
• Studio Boeri Architetti: Milan-based practice recognized for integrating sustainability, vegetation, and energy concepts into residential and public buildings. Comparable on the plus-energy / sustainability differentiation angle relevant to the firm's positioning.

Direct peers

• Coop Himmelb(l)au: Vienna-headquartered architectural practice with globally recognized cultural, public, and sports building work. Direct competitor in Austrian and international architecture competitions and in city-of-Vienna commissions.
• Delugan Meissl Associated Architects: Vienna-based practice delivering cultural, educational, and transport-oriented public buildings across Austria and internationally. Direct competitor for major Austrian public commissions and recognition via awards circuits.
• Baumschlager Eberle Architekten: Austrian/European architecture firm with comparable focus on resource-efficient, sustainable architecture across education, residential, and public projects. Directly comparable as a similarly-sized Central European practice competing in the same competitions and public-sector commissions.
• Architektur Consult ZT GmbH: Vienna-based architecture firm active across cultural, educational, healthcare, and large-scale public projects in Austria. Direct competitor in EU-wide open competitions and in commissions awarded by Stadt Wien and other Austrian public clients.

Broad incumbents

• Henning Larsen (Ramboll): Now part of Ramboll, the practice designs civic, educational, and cultural buildings across Europe with a sustainability focus. Comparable as a broader incumbent offering overlapping capabilities for European public clients competing in similar competitions.

Regional players

• Pichler Ingenieurbüro GmbH (architecture division): Another Austrian-headquartered engineering-architecture group with public-sector building and infrastructure work in the DACH market. Comparable as a regional competitor active in Austrian educational and municipal construction projects.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/karl-und-bremhorst-architekten
• Instagraminstagram.com/karlundbremhorst

Compliance6 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles2 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 Karl und Bremhorst Architekten