ABJ Architekten

What ABJ Architekten does

abj Architekt:innen GmbH is a Hamburg-based architectural practice (GmbH, HRB 129268) operating since 1989 with a 40+ person multidisciplinary team. The firm delivers integrated architectural services across three Schwerpunkte: Bildung (education buildings — primary schools, secondary schools, gymnasiums, vocational colleges, sports halls), Wohnraum (housing — primarily large-scale residential refurbishment such as the 166-unit Bornheide high-rise), and Sonderbauten (special buildings — listed-monument conversions such as the Kaifu Solebad brine spa and Hotel am Dom). Its technology stack centres on BIM, ArchiCAD, Life Cycle Assessment (LCA) methodology and a structured internal "abj Academy" comprising twelve Theme-Labs (Sustainability, Inclusion, Fire Protection, Acoustics, Façade, Roof, Interior Design, Digitalisation, BIM, etc.) that feed expertise into project delivery.

The firm operates a professional-services revenue model billed under the German HOAI (Honorarordnung für Architekten und Ingenieure) fee scale, covering service phases 1–9 and an optional Phase 10 post-occupancy user-participation process. Practically all revenue flows from public-sector clients — municipal school-building authorities (notably SBH | Schulbau Hamburg), cities (Cologne, Rendsburg) and Samtgemeinden (Zeven, Horneburg) — acquired through formal VgV and ÖPP/PPP procurement procedures, often in partnership with general contractors such as GOLDBECK, AUG. PRIEN and Depenbrock. Project scope is supra-regional across Hamburg, Schleswig-Holstein, Lower Saxony and North Rhine-Westphalia, with project sizes ranging from ~1,300 m² sports halls to 8,878 m² secondary schools. Geographic exposure outside Germany is limited to one humanitarian school-build in Mae Sot, Thailand.

Name

ABJ Architekten

Legal name

abj Architekt:innen GmbH

Website

https://abj.eu

Company type

Private

Founded year

1989

Operating status

Operating

Headcount range

11–50 employees

Short description

abj Architekt:innen is a Hamburg-based architecture practice (since 1989, 40+ staff) delivering site-specific design across education, housing and special buildings for public-sector clients in Germany, billed under HOAI fees and procured through VgV/ÖPP competitions.

Ownership category

akta.pro rank

Product category

Architectural Services

NAICS

Architectural Services (54131)

akta.pro industry

PRIMARYBPAHAKAA

Architectural Design Services

Business & Public Services/Professional Services (Legal, Accounting, Consulting)/Architecture, Design & Planning Services

SECONDARYHSAPAEAB

Architectural Reconfiguration & Structural Alterations

Home & Personal Services/Residential Renovation Services/Whole-Home Renovation & Remodel

SECONDARYHSAPAMAC

Garage-to-ADU Conversion

Home & Personal Services/Residential Renovation Services/Garage Conversion & ADU Construction

SECONDARYHSAPADAH

Primary Suite / Bedroom & Closet Additions

Home & Personal Services/Residential Renovation Services/Room Additions & Home Extensions

SECONDARYHSAPAMAF

ADU Design, Architecture & Engineering

Home & Personal Services/Residential Renovation Services/Garage Conversion & ADU Construction

SECONDARYHSAFAJAC

Entryway & Foyer Organization

Home & Personal Services/Home Organization & Decluttering/Specialty Space Organization (Laundry Room, Mudroom, Entryway)

Keywords

• Educational architecture
• School building design
• Residential refurbishment
• Heritage preservation
• Public sector architecture

Headquarters

HQ city

Hamburg

HQ country

Germany

HQ region

Europe

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Architectural design and project management services: Core revenue stream derived from fee-based architectural services under HOAI (Honorarordnung für Architekten und Ingenieure) performance phases 1 through 9 (and Phase 10 user participation). Services span new build, refurbishment, and listed-building projects across education, housing and special buildings. Engagement is project-based with long lead times and milestone-driven billing.
2. ÖPP / Public-Private Partnership project contracts: Several school projects (e.g., Grundschule Zeven, Grundschule Bliedersdorf-Nottensdorf) are delivered via ÖPP (PPP) procedures with construction partners such as AUG. PRIEN. Revenue is generated through integrated planning services bundled within the PPP framework.

Pricing tiers

Go-to-market motion3 records

Distribution channels3 records

Marketing channels8 records

Core offering

abj Architekt:innen is an integrated architectural practice founded in 1989 in Hamburg, delivering site-specific architecture across three Schwerpunkte: Bildung (education buildings), Wohnraum (housing), and Sonderbauten (special buildings). Services span new builds, extensions, refurbishments and listed-building conversions, executed under HOAI service phases 1–9 and supplemented by a Performance Phase 10 post-occupancy user-participation process. Practice is supported by in-house Theme-Labs covering BIM, fire protection, acoustics, sustainability, façade, roof and interior design.

Product overview

abj Architekt:innen is an integrated architectural practice (not a modular software product) operating since 1989 from Hamburg, focused on three Schwerpunkte: Bildung (education buildings), Wohnraum (housing) and Sonderbauten (special buildings). Its service offering is delivered through a single unified practice that combines the three Schwerpunkt service lines (Education, Housing, Special Buildings) with the internal abj Academy (which includes Theme-Labs on Sustainability, Inclusion, Fire Protection, BIM, Acoustics, Façade, Roof, Interior Design, etc.), the Performance Phase 10 post-occupancy user-participation service, and shared CAD/BIM/QM technical expertise. Individual building projects — e.g. Grundschule Zeven, BLINO, BILLE Gymnasium, Gymnasium Herderschule, Johann-Gottfried-Herder-Gymnasium Köln, Sporthalle Neumünster, Bornheide 80/82, Kaifu Solebad, Hotel am Dom — sit under these Schwerpunkte and progress through HOAI service phases 1–9.

Differentiator

Problem solved

Functional benefit

Products and services

• Architecture for Education (Bildung) Site-specific architecture for educational facilities including new builds, extensions and refurbishments of primary schools, secondary schools, vocational colleges, grammar schools and campus ensembles, covering HOAI service phases 1-9. Notable projects include Grundschule Zeven, BLINO, BILLE Gymnasium, Gymnasium Herderschule, Johann-Gottfried-Herder-Gymnasium Köln, Berufskolleg Rheine and the Lüneburg sports halls.
• Architecture for Housing (Wohnraum) Architectural services for residential developments including new construction and large-scale refurbishment of existing housing stock. Notable project: Bornheide 80/82 high-rise in Osdorf (Hamburg) — refurbishment of a 16-/18-storey, 166-unit prefabricated housing estate with a 17,855-panel iridescent metal façade.
• Architecture for Special Buildings (Sonderbauten) Architecture for non-standard building typologies including listed/heritage-protected conversions, hospitality, public baths, market halls, fire stations and listed-monument refurbishments. Notable projects: Kaifu Solebad (brine-thermal spa conversion in a listed building), Rindermarkthalle (former slaughterhouse to market hall), Hotel am Dom (DGNB Gold), Feuerwache Zeven.
• Performance Phase 10 – Post-Occupancy User Participation A dedicated post-completion service in which abj engages in dialogue with students and teachers at the schools it has built, capturing feedback that feeds into the next generation of school design. Goes beyond traditional HOAI phases 1-9.

Quantifiable outcome

• 17,855 individually produced metal façade panels installed across 7,800 m² of façade surface in six months at Bornheide high-rise
• +4 more outcomes

Named customers8 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Partnerships

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

• GOLDBECKflagshipStrategic or Co-development Partner · 15 December 2025Strategic construction partner for the Achter de Weeden school centre project. abj delivers architectural design while GOLDBECK acts as partner in rethinking the learning environment that houses two schools (a comprehensive school and a grammar school) under one roof via a four-storey modular extension.
• AUG. PRIEN BauunternehmungflagshipImplementation/ SI/ Consulting PartnerÖPP (PPP) construction partner for several school projects, including the Grundschule Zeven new build and the Grundschule Mühlenberg in Hanover (multi-phase construction with daycare, family centre and sports hall). Joint construction-site visits and project tours.
• DepenbrockcoreImplementation/ SI/ Consulting PartnerConstruction partner for the extension new build of the Johann-Gottfried-Herder-Gymnasium in Cologne (two stacked sports halls plus classroom wing, 4,708 m² BGF, 1st place ÖPP procedure).
• MRLV ArchitektenminorStrategic or Co-development PartnerClient / contracting architectural partner for the Kaifu Solebad refurbishment in Hamburg-Eimsbüttel. abj delivered performance phases 6-8 HOAI; project completed in collaboration with Bäderland Hamburg as building owner.
• Hahn Hertling von HantelmannminorImplementation/ SI/ Consulting PartnerLandscape-architecture partner for the Bille-Gymnasium new build in Hamburg-Bergedorf.
• MERA - Landschaftsarchitektur für Mensch und RaumminorImplementation/ SI/ Consulting PartnerLandscape-architecture partner for the Bornheide high-rise refurbishment in Hamburg-Osdorfer Born.
• moka-studio GbRminorImplementation/ SI/ Consulting PartnerLandscape-architecture partner for the Grundschule Bliedersdorf-Nottensdorf (BLINO) new build.
• JUNO (juno-hamburg.com)coreTechnology or IntegrationWeb design and programming partner for the abj.eu corporate website; also involved in corporate-design work for abj's new office (corporate architecture via colours, materials and furniture).
• 22quadrat (22quadrat.com)minorGTM or Marketing PartnerStorytelling partner supporting abj's corporate-culture visualisation and communications.
• Diakonie-Stiftung MitMenschlichkeit (Diakonie-Haus Münzviertel)minorOthersRecipient of abj's 2025 Christmas donation; non-profit partner providing sheltered housing for homeless people with ~30 small flats and an on-site medical practice. abj's social engagement programme has supported regional social initiatives every Christmas since 1999 in lieu of client gifts.

Scale indicators8 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• HPP Architekten: HPP is a long-established German full-service architecture firm with a strong track record in education, housing and special buildings across DACH. Like abj, HPP competes in public-sector VgV procedures for schools and housing cooperatives, but operates at significantly greater scale and geographic breadth.
• KSP Engel: KSP Engel is a major German architecture firm with a substantial education and public-building portfolio, including school and university commissions. Like abj, KSP participates in VgV/ÖPP procedures for municipal clients, but operates with a larger national footprint and broader service offering.
• gmp Architekten: gmp is one of Germany's largest and most internationally recognised architecture practices, with a deep portfolio in cultural, public and education buildings. Comparable to abj on public-sector competition experience, scale and HOAI-style project delivery, though materially larger and broader in scope than abj's mid-sized Hamburg practice.

Others

• Drees & Sommer: Drees & Sommer is a major German real-estate consulting, planning and project-management firm frequently partnered on large public-sector ÖPP/PPP school and infrastructure projects alongside architecture practices like GOLDBECK and abj. They are an adjacent ecosystem participant rather than a direct competitor, but highly relevant to abj's delivery model in PPP tenders.

Regional players

• Barkow Leibinger: Berlin- and Munich-based internationally active practice known for competition-winning public, educational and cultural buildings in Germany. Comparable to abj in their reliance on public-sector competition wins and emphasis on innovative building technology, though more internationally oriented and design-celebrity-driven.

Direct peers

• kbnk Architekten: Hamburg-based mid-sized practice with deep experience in school construction, housing and listed-building refurbishment across Northern Germany. Direct peer to abj on geography, project typology and public-procurement GTM; kbnk was Nina Svensson's most recent employer before her return to abj.
• Hascher Jehle Architekten: Berlin-based architecture firm with a strong portfolio in education, research and special buildings, frequently awarded through public competition procedures. Comparable to abj in Schwerpunkt mix, HOAI delivery model and emphasis on sustainable building certifications.
• hammeskrause architekten: Stuttgart-based practice with comparable focus on educational and public-sector architecture in Germany, including school and sports-hall commissions. Similar mid-sized structure and design-led profile to abj, making it a close analogue for project mix and competition-driven GTM.
• Heinle, Wischer und Partner Freie Architekten: Dresden-based practice with longstanding expertise in educational architecture, urban housing and competition-driven public commissions. Comparable to abj in their emphasis on pedagogically meaningful school design and on winning VgV procedures for municipal clients.
• ppp architekten (formerly pmp): Stuttgart-area practice focused on sustainable educational, social and special-purpose buildings, frequently delivered via public competition. Comparable to abj on Schwerpunkt mix (Bildung/Sonderbauten), sustainability credentials and mid-sized German-competition-driven profile.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/abj-architekten
• Instagraminstagram.com/abj.architekt_innen

Compliance9 records

Revenue estimate

Valuation estimate

Number of profiles

Profiles5 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 ABJ Architekten