You can help expand this article with text translated from the corresponding article in Spanish. (July 2023) Click [show] for important translation instructions. View a machine-translated version of the Spanish article. Machine translation, like DeepL or Google Translate, is a useful starting point for translations, but translators must revise errors as necessary and confirm that the translation is accurate, rather than simply copy-pasting machine-translated text into the English Wikipedia. Do not translate text that appears unreliable or low-quality. If possible, verify the text with references provided in the foreign-language article. You must provide copyright attribution in the edit summary accompanying your translation by providing an interlanguage link to the source of your translation. A model attribution edit summary is Content in this edit is translated from the existing Spanish Wikipedia article at [[:es:Ildefonso Cerdá]]; see its history for attribution. You may also add the template {{Translated|es|Ildefonso Cerdá}} to the talk page. For more guidance, see Wikipedia:Translation.

This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. Find sources: "Ildefons Cerdà" – news · newspapers · books · scholar · JSTOR (July 2023) (Learn how and when to remove this message)

Ildefons Cerdà Sunyer
Portrait by Ramon Martí Alsina, 1878
Born	23 December 1815 Centelles, Catalonia, Spain
Died	21 August 1876(1876-08-21) (aged 60) Las Caldas de Besaya, Los Corrales de Buelna, Cantabria, Spain
Nationality	Spanish
Citizenship	Spain
Known for	Designed expansion of Barcelona known as the "Eixample"
Scientific career
Fields	Urban planner, civil engineer, politician
Signature

Ildefons Cerdà Sunyer^[1] (Catalan pronunciation: [ildəˈfons səɾˈða i suˈɲe]; Spanish: Ildefonso Cerdá Suñer; 23 December 1815, Centelles – 21 August 1876, Caldas de Besaya) was a Spanish urban planner and civil engineer who designed the 19th-century "extension" of Barcelona called the Eixample. Because of his extensive theoretical and practical work, he is considered the founder of modern town planning as a discipline, having coined the word "urbanization".^{[2] [3]}

Cerdà was born in Centelles, Catalonia, Spain, in 1815.^[4] He trained as a civil engineer at the Escuela de Ingenieros de Caminos, Canales y Puertos [es], in Madrid. He joined the Corps of Engineers and lived in various cities in Spain before settling in Barcelona in 1848 and marrying Clotilde Bosch. After the death of his brothers, Cerdà inherited the family fortune, and left the civil service. He became interested in politics and the study of urban planning.^[5]

When the government of the time finally gave in to public pressure and allowed Barcelona's city walls to be torn down, he realized the need to plan the city's expansion so that the new extension would become an efficient and livable place, unlike the congested, epidemic-prone old town within the walls. When he failed to find suitable reference works, he undertook the task of writing one from scratch while designing what he called the Ensanche or Eixample, borrowing a few technological ideas from his contemporaries to create a unique, thoroughly modern integrated concept that was carefully considered rather than whimsically designed.^{[citation needed]}

He continued to create projects and improve existing designs throughout his lifetime, as well as to develop his theories taking on larger planning scopes (at the regional planning level), until the very end. In the process, he lost all his family's inheritance and he died in 1876 a heavily indebted near-pauper, never having been paid for his chief masterpiece, the design of Barcelona's Eixample.^{[citation needed]}

Cerdà was a multi-faceted man who, in pursuit of his vision, gave up a steady job in the civil engineering service, stood for election and became a member of the Cortes (the Spanish Parliament); drafted useful ground-breaking legislation, drew up a detailed topographical survey map of Barcelona's surroundings, and wrote a theoretical treatise to support each of his major planning projects. He actually coined a number of important words in Spanish, including urbanización.^{[citation needed]}

Cerdà focused on key needs: chiefly, the need for sunlight, natural lighting and ventilation in homes (he was heavily influenced by the sanitarian movement), the need for greenery in people's surroundings, the need for effective waste disposal including good sewerage, and the need for seamless movement of people, goods, energy, and information.^{[citation needed]}

His designs belie a network-oriented approach far ahead of his time. His street layout and grid plan were optimized to accommodate pedestrians, carriages, horse-drawn trams, urban railway lines (as yet unheard-of), gas supply and large-capacity sewers to prevent frequent floods, without neglecting public and private gardens and other key amenities. The latest technical innovations were incorporated in his designs if they could further the cause of better integration, but he also came up with remarkable new concepts of his own, including a logical system of land readjustment that was essential to the success of his project, and produced a thorough statistical analysis of working-class conditions at the time, which he undertook in order to demonstrate the ills of congestion.^{[citation needed]}

This section does not cite any sources. Please help improve this section by adding citations to reliable sources. Unsourced material may be challenged and removed. (October 2021) (Learn how and when to remove this message)

Cerdà's plan for Barcelona underwent two major revisions; the second version, approved by the Spanish government at the time, is the one still recognizable in the layout of today's Eixample, though the low height of buildings and the gardens within every city block were soon dispensed with by politicians inclined toward property speculation.^[who?] In addition, only one of the two planned diagonal streets was realized. Culturally, the Eixample was (and still is) inhabited by the well-to-do, instead of integrating social classes. Many of the Catalan architects of his time opposed Cerdà's ideas, even accusing him of promoting socialism; in the end, however, they designed the Modernista façades that brought fame to the district.^{[citation needed]}

Political developments in Spain and Catalonia eventually led to the enshrinement of a revisionist version of how Cerdà secured official approval of his plan. Cerdà actually drew up his plan under the commission of the then competent authority, the Spanish central government, with the support of the city council. A political reversal led to a change in local government, and the new council sought to preempt the previous central government's decision by holding a project competition in 1859, which Cerdà lost; nevertheless, Cerdà's design prevailed, much to the chagrin of the major property owners. ^{[citation needed]}

• Teoría de la Construcción de Ciudades ("Theory of City Construction", 1859), written to support his 1855 preliminary project for the Barcelona Extension.
• Teoría de la Viabilidad Urbana y Reforma de la de Madrid ("Theory of Urban Roadspace and Reform of That of Madrid", 1861), to support his inner-city reform designs for the capital of Spain.
• Teoría del Enlace del Movimiento de las Vías Marítimas y Terrestres ("Theory of the Linkage of movement on Landways and Seaways", 1863), to accompany a Preliminary Project for a road-rail-sea intermodal system at the port of Barcelona, evidence of which is conclusive though most of the content has not yet been found.
• Teoría General de la Urbanización ("General Theory of Urbanization", 1867), to support his 1859 project for the Barcelona Extension (digizalization: Volume 1 and Volume 2).
• Teoría General de la Rurización ("General Theory of Ruralization")

• Urban planning of Barcelona

• Arturo Soria y Puig (ed): Cerdá: the five bases of the general theory of urbanization, Electa, 1999 ^{[ISBN missing]}
• Pallares-Barbara, Montserrat; Badia, Anna; Duch, Jordi (2011). "Cerdà and Barcelona: The need for a new city and service provision". Urbani Izziv. 22 (2): 122–136. doi:10.5379/urbani-izziv-en-2011-22-02-005.
• Aibar, E., & Bijker, W. E. (1997). Constructing a City: The Cerdà Plan for the Extension of Barcelona. Science, Technology, & Human Values, 22 (1), 3–30. doi:10.1177/016224399702200101

Wikimedia Commons has media related to Ildefons Cerdà.

• Ildefons Cerdà. Personalitat i ideologia
• Biography
• Fifteen articles on Ildefons Cerdà, his work and its impact on the City of Barcelona, Barcelona Metropolis, Autumn 2009.