It’s claimed that Cologne built more social housing than any other German city in the 1920s. The city’s housing programme deserves study in own right therefore but it also provides a fascinating case study in the interwar evolution from an arts and crafts-inspired architecture to a more functionalist modernism. In Cologne, we see an explicit shift from the Gartenstadt to Neues Bauen – from the Garden City to a type of ‘New Building’ (sometimes termed New Objectivity) that emphasised simpler, plainer forms and modern materials. We’ll see this played out particularly in the career of the city’s leading architect, Wilhelm Riphahn.

Cologne had been an independent Free City until the French invasion of 1796, part of Prussia from 1815 and, from 1871, a city of the newly unified German Reich. In the nineteenth century, it grew exponentially as a commercial and industrial centre and railway hub; its population increased from around 42,000 at the beginning of the century to over 372,000 by its end and to almost 517,000 by 1914. This rapid urbanisation caused housing problems common to all European cities during the Industrial Revolution.
In the years leading up to the First World War, Cologne was governed by the Deutsche Zentrumspartei (the German Centre Party), a moderate Catholic political organisation; the city’s deputy mayor from 1909 was Konrad Adenauer. It was Adenauer who, in 1913, founded the Gemeinnützige Wohnungs-und Siedlungs-AG, a public limited non-profit housing and settlement company, generally known then and now as GAG. It was endowed with a share capital of around 1.22 million Reichsmarks (about £61,000 at the time), roughly half from private investors and half from the City of Cologne which controlled 52 percent of its shares. (1)
Bickendorf
In the year of its foundation, GAG organised an architectural competition to design a new eleven-hectare (27-acre), 600-home settlement in Cologne-Bickendorf. It was won by Caspar Grod, Lothar Kaminski and Wilhelm Riphahn with an entry titled (in dialect) ‘Lich, Luff un Bäumcher’ – light, air and trees.

It took its initial inspiration from Britain’s Garden City movement. Ebenezer Howard had published Garden Cities of To-Morrow in 1902; the German Garden City Society was founded the same year though with a more practical emphasis on smaller garden settlements. The more immediate inspiration for the winning entry was the model housing provided for the workforce of the Krupps factories in Essen.
Construction of a planned 575 single-family houses began in 1914. Each was provided an ornamental front garden; more practical allotment-style plots were located to the rear. The timing – as the First World War erupted- was inauspicious and just 80 homes had been completed by 1918. Riphahn was entrusted with the completion of the settlement after the war and by 1921 a total of 544 houses had been built along eleven, suitably bucolically named, thoroughfares.
Grüner Hof
The GAG’s next project and Riphahn’s next commission was Grüner Hof (Green Court), built between 1922 and 1923. As the name suggests, the scheme maintained the organisation’s emphasis on light, air and trees but it took as its model contemporary Dutch social housing and a favoured residential courtyard form that arrayed housing blocks around green open space. JJP Oud’s Tusschendijken scheme, 1920-23, in Rotterdam is cited as a particular influence.

In this, the Cologne estate anticipated Bruno Taut’s better-known Hufeisensiedlung (Horseshoe Estate) in Berlin, built between 1925 and 1927. In Cologne, the three courtyard spaces were interspersed between the estate’s four four-storey housing blocks in GAG’s first multi-storey development.
Oud is seen as an early exponent of the ‘New Building’ style; here in Cologne it can be recognised in the use of simple, often cubic, forms and new materials such as steel and concrete. In this respect, early modernism represented less a revolutionary break and more an evolution from existing forms. (3)
Bickendorf II/Rosenhofsiedlung
GAG’s next major scheme was a new estate built on the northern edge of the existing garden suburb of Bickendorf, sometimes known as the Bickendorf II, more often as Rosenhofsiedlung.
This was a large estate of over 1100 homes, of eleven types, built along gently curving roads radiating from a central square. Riphahn was once more in charge of the overall development while the painter and sculptor Franz Wilhelm Seiwert provided a unifying colour scheme, a palette of yellows and whites. The first houses built, along Akazienweg, followed established styles but later building took on a more functionalist form.
Social housing in Germany at this time, as in Britain, was disproportionately confined to the better-off working class who could pay its relatively higher rents regularly. Rosenhofsiedlung also had a significant number of lower middle-class and middle-class tenants, including artists, doctors and academics. Strict selection criteria applied and even into the 1980s prospective tenants were interviewed personally by GAG’s board of directors. (4)
This was an ambitious and innovative era in European social housing in which new ideas and models were widely shared. In 1925, Riphahn travelled with twelve colleagues to the Netherlands where they met Michel de Klerk and Piet Kramer and Willem Dudok, responsible for major schemes in Amsterdam and Hilversum respectively.
Blauer Hof
The influence of this visit might be seen in the layout of Blauer Hof (Blue Court), Riphahn’s next major work alongside his colleague Caspar Maria Grod, in its use of the courtyard arrangement typical of Dutch social housing. The local artist Heinrich Hoerle devised a colour scheme of coral red window frames on light grey facades.
At the time, a swathe of lower-income homes had been cleared to build the Mülheim Bridge over the Rhine completed in 1929. To cope with the new pressure on housing from those displaced, GAG had acquired 18 hectares (around 45 acres) of land in Kalkerfeld to the south of Mülheim. The site was convenient to Buchforst railway station and was planned to cater for a poorer, less mobile population that lived and worked on the Rhine’s right bank.
Small apartments, averaging 50 m² (540 sq ft) were another means of building more cheaply for this lower-income population. Whilst each home had an inside toilet, only the larger ones also included a bathroom. The north-south disposition of some blocks and the loggias and balconies provided for each apartment were intended to maximise the light and fresh air enjoyed by residents.
As the contest between modernist architects and their traditionalist counterparts sharpened, the scheme witnessed its own version of the Dächerkrieg (Roof War) that erupted notoriously in Zehlendorf, Berlin, in 1928. (On one street, Am Fischtal, pitched roof houses were built in direct challenge to their modern, flat-roofed counterparts on the other side of the road.) In Buchforst, Riphahn’s fellow architect Otto Müller-Jena was found, in Riphahn’s absence, adding pitched roofs to some of the architectural drawings before being hastily redeployed to another project. (5)
The vanguard of modernist design, however, was seen in the Dammerstock scheme commissioned by the City of Karlsruhe in 1928. Karlsruhe invited Germany’s leading housing architects, including Riphahn, to compete for the role of master planner; their entries were assessed by a prestigious jury including, amongst others, such leading modernists as Ernst May and Ludwig Mies van der Rohe.
In the event, Walter Gropius and Otto Haesler were awarded the commission and Riphahn came third. Gropius had resigned his leadership of the Bauhaus School that year but its terraced (or row) housing model had already been pioneered in Dessau-Törten. Riphahn, now explicitly a follower of the Modernist Movement, had proposed just such a scheme in his own submission and it was this form that Gropius applied at Dammerstock. The scheme also emphasised the north-south disposition of blocks maximising sunlight favoured by Modernism, a Zeilenbau arrangement in German.
Weisse Stadt
Riphahn’s enhanced prominence ensured his next commission (once more with Caspar Maria Grod) from GAG – the design in unashamedly modernist form of what became known as Weisse Stadt (White City) in the Buchforst district of Cologne, largely built between 1928-29.
The principal feature of the new estate was a range of five-storey terraced blocks of flats, interspersed among generous shared green open space and deployed diagonally from the area’s main thoroughfares, Heidelberger Strasse and Waldecker Strasse. The flats, at around 80 sq m (860 sq ft) were larger than those in Blauer Hof and all enjoyed large balconies; those on upper storeys benefitted from roof terraces. This was a scheme, as André Dumont’s study of the new residents has shown, that was designed for disproportionately middle-class and professional occupation.
This commitment to social mix was amplified in the estate’s next phase of development, streets of terraced housing with private gardens. In a deliberate corrective to sometime criticism of the monotonous form of contemporary terraced schemes, these were juxtaposed in a 45-degree rotation to the five-storey blocks.
A range of shops was provided along Heidelberger Strasse to serve the local community. It’s a telling symbol of the divided politics of the Weimar Republic that two consumer cooperatives vied for trade; Eintracht was a Christian-conservative society, the KG Hoffnung socialist. (6)
Beyond this, perhaps the visually outstanding feature of the estate is the Church of St Peter Canisius designed by Riphahn and Maria Grod in basilica form and in striking functionalist, modernist style and construction, completed in 1931.
A community centre including a restaurant, kindergarten, mothers’ advice centre and library was completed in 1932. This was destroyed in 1945 and not replaced. (The church, also heavily damaged in the war, was rebuilt in 1948.)
Divided politics and wartime destruction remind us that the Nazis came to power in 1933. Riphahn’s work was considered ‘undeutsch’ in the new totalitarian state and he was excluded from any public contract until 1938 when, due to the good offices of friends, he secured some commercial work and even, in suitably conservative form, some contracts for a GAG now led by Nazi placemen.
Riphahn came into his own again in the period of post-war reconstruction when he designed, amongst other schemes, the new French and British cultural institutes and, most notably, the new Cologne Opera House completed in 1957. He died, aged 74, in December1963. He deserves to be better known but his modest demeanour and practical focus ensured a relatively low profile even at the height of his success. As one contemporary noted, he was ‘the one who built the most and spoke the least’. (7)
Just two months before Riphahn’s death, Konrad Adenauer, who we met as a deputy mayor of Cologne and founder, in 1913, of GAG, had resigned as German Chancellor, a post he had held since 1949. Briefly imprisoned by the Nazi regime and suffering a form of inner exile during the war, Adenauer would play a key role in West Germany’s reconstruction and rehabilitation after it.
GAG survives. With some 600 employees and owning and managing around 45,000 properties of various types, it is the city’s largest landlord. The City of Cologne owns around 88 percent of its shares. In the city itself, there are some 40,000 social rent homes, down from over 100,000 in the 1990s. (8)
The quality and architectural significance of these interwar estates is now widely recognised and the well-maintained estates have been appropriately modernised. Blauer Hof, for example, was registered as an architectural monument in 1988 and completely renovated between 2006 and 2010. GAG itself provides excellent information on the architectural and social history of the estates both for residents and others who are interested. (This is something that councils and housing associations in the UK might usefully emulate).
Despite financial and political pressures common to the sector throughout Europe, social housing continues to be a dynamic, innovative and much needed force in modern Germany. We can nevertheless look back to the ground-breaking idealism of the 1920s as a Golden Age and a model to which we might aspire.
Sources
(1) Andreina Milan, ‘Wilhelm Riphahn in Cologne (1913–1963): Urban Policies and Social Housing between Innovation and Conservation’, Urban Planning, vol 4, no 3, 2019. Other detail is drawn from this source.
(2) GAG, Von der Gartenstadt zur Gartensiedlung and Die erste GAG-Siedlung
(3) KuLaDig, Siedlung ‘Grüner Hof’ in Mauenheim
(4) GAG, Ein blühender Ort für das Gemeinschaftsleben
(5) GAG, Wo der Himmel für alle da ist and Rheinische Iindustriekultur, Köln, Waldecker Str. | Dortmunder Str. | Kasseler Str. (Buchforst) Gemeinnütziger Wohnungsbau, GAG-Siedlung
(6) GAG, Fortschrittlichste Siedlung ihrer Zeit
(7) GAG, Architektur für die Menschen
(8) International Observatory of Social Housing, Cologne Social Housing- Tale of a Growing City (September 2015)




















































































































































