Purpose: Customization is a paradox in architecture, providing necessary modernization for buildings but potentially damaging their architectural integrity. In this paper, the authors introduce the Inhabitant-Driven Customization approach for avoiding this paradox; this approach lets inhabitants design the customization from options created by architects that safeguard architectural rules. As a first implementation of the Inhabitant-Driven Customization approach, the MyChanges tool is presented. The authors assess whether the approach avoids the customization paradox by a qualitative stakeholder evaluation of the MyChanges tool and by a comparison of the Inhabitant-Driven Customization approach with existing approaches to housing customization. Design/methodology/approach: MyChanges is a shape grammar-based design tool developed to enable inhabitants of the Álvaro Siza Vieira Malagueira housing complex to customize their houses in accordance with the architectural language of the complex. In this study, the authors qualitatively evaluated MyChanges with architects and other professional stakeholders. MyChanges is used in this paper to assess if the Inhabitant-Driven Customization approach avoids the paradox of customization. The initial reception of MyChanges produced diverging outcomes, suggesting that Inhabitant-Driven Customization is also unable to avoid the customization paradox. For analyzing this possibility further, this paper describes the main existing approaches to housing customization, including the Inhabitant-Driven Customization approach, formulates nine conditions for these approaches, and provides a qualitative comparative assessment of the approaches. Findings: The customization paradox is demonstrated in the outcomes of the interviews with professional stakeholders on the MyChanges customization tool for the Malagueira housing complex. An argument is given that makes plausible that the Inhabitant-Driven Customization approach avoids the customization paradox by creating a co-design process in which inhabitants and architects alternately shape customization. Originality/value: The originality of this paper lies in the introduction and discussion of the paradox of customization in housing. The paper identifies the conditions advanced in architecture for assessing housing customization approaches. Additionally, the authors propose a new customization approach and a design tool that to a large extent fulfills those conditions and avoids the customization paradox.

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In this paper we present and assess tools for visualizing architectonic modifications of existing housing in co-design projects with inhabitants. These tools should enable inhabitants to explore and understand design variations of alterations of their houses. This contribution is part of ongoing research on the use of artificial realities for supporting the transformations of existing housing in architectonically responsible ways. Such transformations may be needed after the delivery of housing, say after five years or later, due to changed regulation, the need of updates or changed living conditions of inhabitants. For arriving at architectonically responsible transformations, we use shape grammar system for defining possible modifications of the housing. For empowering inhabitants to understand and explore these modifications to their housing, we develop a transformation grammar tool—MyChanges—to visualize the modifications by three visualization modes, from fully immersive to non-immersive. Interviews and tests with real inhabitants were performed, and preliminary conclusions show that a tool like the MyChanges would have a good acceptance among inhabitants.

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In this chapter we consider computer tools for architectural design based on shape grammar design systems, and evaluate the advantages and disadvantage of handing over these tools to inhabitants for the design of their apartments. This evaluation is qualitative by considering the values of inhabitants, architects, and cities that are affected by this hand-over. Shape grammar design systems when applied to architecture enable computer tools to generate new designs and adjustments of existing designs of apartments on the basis of design rules. First, focussing on individual housing, it is argued in this chapter that the use of shape grammar design systems by inhabitants for designing their apartment realises the values of customisation and inhabitant autonomy without compromising design quality and structural safety. Second, focussing on cities, it is argued that a wide-spread use of these grammar design systems creates for cities a bottom-up inhabitant-led renewal of neighbourhoods and urban structures that maintains the social fabric in neighbourhoods and the architectural identity of cities. Values that are less realised by the hand-over are financial feasibility and ecological sustainability. Third, shifting to philosophy of technology, we present shape grammar design systems as a technology for design for values in architecture that allows for flexibility in the values designed for over the longer time periods characteristic to architecture. These systems are a technology that enables the incorporation of values of inhabitants, architects, and cities by the designs of apartments, and they are a technology that enables inhabitants to adjust their apartments through time to their developing needs and wishes.

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This paper presents a post-handover shape grammar for introducing inhabitants wishes in the transformation of individual houses of the Malagueira housing complex by Álvaro Siza Vieira in Évora, Portugal. The presented research includes a case study developed in the context of the workshop Gramática da Forma em estudos de habitação - análise, geração e customização at the Universidade Federal do Rio de Janeiro, Brazil. In this paper we present the first developments of the Malagueira transformation grammar, including corpus of analysis, shape rules, and derivations, and we discuss the opportunities that shape grammar brings to user-centered design.@en

This paper compares the quality of designs generated by shape grammar systems with designs created by professional architects. It describes an experiment in which evaluators ranked the quality of preliminary designs for refurbishing Lisbon’s rabo-de-bacalhau apartments. The result showed that the design quality of the grammar solutions for the task was similar to that of the designs by professional architects. Thus, this paper argues that shape grammars can be used as stand-alone design systems in architecture. The practical value is that shape grammar systems become alternative means of taking up design challenges that currently require too much effort by architects to be economically feasible, such as refurbishing all of Lisbon’s rabo-de-bacalhau apartments.@en