For over 30 years, researchers and practitioners from diverse fields of knowledge aimed to improve the efficiency and effectiveness of the New Product Development process (NPD), addressing complex design and production issues. At the end of the 90's Kagioglou et al. (1998) stated that the manufacturing industry was under transformation due to increased globalised competition, which reflected on a need for companies to search for fast responses to changing customers' requirements. The ability of companies to respond to those requirements relies on communication with customers and the capacity to translate their requirements into finished products and services, which is the main concern of NPD. This has also been the main focus of lean design and construction initiatives and remain as current today as it was more than 25 years ago.

Mass customization is a strategy to improve value generation for customers, by offering product variety and, at the same time, maintaining costs and delivery time to an acceptable level. A key problem for applying this strategy in the housebuilding sector is the definition of the solution space, i.e. the range of product alternatives that will be offered. This paper proposes an adaptation of conjoint analysis to identify customer preferences regarding customizable attributes in low-cost housing projects. The utility of this adaptation is illustrated by a case study, which was carried out in a construction company that had delivered low-income housing projects, and offered some degree of product flexibility. Results indicate that this technique was effective to understand customers' preferences out of a range of housing attributes, by providing a ranking of those attributes chosen by customers. Therefore, this technique can support decision-making when dealing with trade-offs between customers' preferences, product flexibility and costs, which is an important concern for companies that deliver customized housing units.

Mass customization (MC) is a business strategy that stands for the ability to develop high value-added products within short time frames and at relatively low costs. It emerged from the manufacturing industry and has been applied to several industrial sectors, including housing. However, the segment of affordable housing programs in developing countries has been criticized for having a high degree of product standardization, and failure to meet customers’ specific needs. The aim of this paper is to propose guidelines for implementing mass customization in affordable house-building projects. It is based on a design science research study carried out in a small-sized company, which explored the possibility of adopting mass customization ideas to offer some flexibility for customers while maintaining low costs. The main contributions of this research study are concerned with expanding the current understanding of the components that enable MC to be implemented in the context of house-building companies that adopt traditional construction technologies. From a practical perspective, this investigation outlines several practices that can be introduced for the implementation of MC strategies at a relatively low cost by small-sized house-building companies.

Mass customisation is a business strategy that aims to deliver a variety of products that fulfil customer requirements and, at the same time, keep price and delivery time within acceptable limits. It has been adopted in different sectors to increase value generation, including house building. A major challenge in mass customisation is customer integration, i.e., how to improve value generation by understanding and considering requirements from different customers, and defining their involvement in product development. Most studies on this topic tend to be technology-focused, often being limited to methods and digital tools to generate and display product alternatives. The aim of this paper is to propose a framework of decision categories for customer integration and for devising the scope of customisation to support the definition of mass customisation (MC) strategies. Design science research was the methodological approach adopted in this investigation. It was based on a literature review about mass customisation practices and also on an empirical study developed in a residential building company from Brazil. The main contribution of this paper is a framework for customer integration, which contains a set of decision categories related to the definition of the scope of customisation and customer integration, and a list of practices that are applicable to house building. A secondary contribution of this investigation is a set of constructs that have been used to describe the decision categories and their relationships.

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