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Purpose The purpose of this paper is to discuss the relation between building conservation and circular economy (CE), which are often erroneously seen as inherently contradictory to one another. Design/methodology/approach The work draws from a comparative approach. The paper reviews a body of literature on architectural conservation and CE to establish an understanding on the state-of-the-art for both disciplines separately. Then, the relation between thereof is developed through a theoretical discourse. Findings Both architectural conservation and CE aim at safeguarding value, although they define “value” differently. Fabric-focused conservation and CE favor minimal intervention to material, albeit they arrive at this conclusion from different bases. Consequently, both approaches struggle with the low cost of virgin resource extraction and waste production and the high cost of human labor in contemporary Western societies. CE could be harnessed for building conservation by adopting its vocabulary and methodology, such as lifecycle assessment and material flow analysis. Transitioning toward CE can help increase the preservation of built heritage while redefining what is meant by “heritage” and “waste.” Originality/value Prior to this paper, there have been no articles addressing the relationship of the concepts explicitly and to this extent. The paper provides a theoretical basis for further discourse and outlines some implications of CE for the construction and built heritage disciplines.

Research has identified cities as potential urban mines for recovering secondary construction materials. Studies typically focus on stocks or flows of bulk materials on high abstraction levels. To enable a shift of focus toward higher levels of circular economy, such as waste minimization, there is a need for a more detailed understanding of the dynamics that contribute to the waste flows, building replacement in particular. This paper examines the characteristics and location of the stocks and flows of buildings, both residential and non-residential, in the city of Tampere, Finland, over the last 20 years. Statistical and geographical analyses are performed on the building stock, new construction, and demolition in Tampere to unveil patterns pertaining to stock change and building replacement. The study shows that these patterns vary significantly between buildings of different function. Spatially confined redevelopment areas within the city structure, that is, brownfields and grayfields, whose industrial and commercial functions yield to housing and mixed residential-commercial use, make up major arenas for replacement. Policy-making should acknowledge that urban planning stirs these waste flows and incorporate their conscious prevention and management on its agenda. K E Y W O R D Sbuildings, cities, industrial ecology, material flow analysis (MFA), urban metabolism, urban planning INTRODUCTIONSocieties are growing more interested in the circularity of production and consumption for sustainability reasons. Construction is one of the sectors to consume the most virgin raw materials (Bourguignon & Orenius, 2018) and to produce the most waste (European Commission, 2019). Consequently, building stocks are attracting attention as potential deposits for secondary resources, typically understood as secondary raw materials.Extraction from these "urban mines" is considered to be more environmentally friendly than the extraction of virgin resources.Most of the urban mining research focuses on bulk materials (Lanau et al., 2019), but the secondary resources embedded in building stocks can in fact take up many forms and scales. Huuhka and Vestergaard (2019) have conceptualized them against the hierarchy of circular economy (CE), echoing the EU waste hierarchy (European Union, 2008). As these hierarchies prioritize life-cycle extension and waste prevention, the first andThis is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

Adaptability is one key aspect in making housing more sustainable. One major approach to adaptability is internal transformability of buildings, i.e. the possibility to make modifications to the spaces and their equipment within the existing building envelope. This aspect is often taken into consideration in the design and implementation of office buildings. However, in housing the situation is different, and internal transformability is very seldom implemented in apartment buildings. There is a lack of studies for the reasons for this. In this article we take a look at the barriers to internal transformability of apartment buildings in two Nordic countries, Finland and Denmark. We compare the situations in both countries, and highlight their similarities and differences. The research is based on interviews of Finnish and Danish architects who have been involved in designing such buildings within the last 20 years. The interviews show that the disinterest of housing developers has been the main barrier to implementing internal transformability. Another important barrier is the developers’ cost-optimization. Secondary barriers were related to lack of solutions in building services that would support internal transformability. Additionally, secondary barriers were related to common construction techniques, regulations, and building conventions. Major barriers were similar in both countries. However, some differences in the secondary and other barriers between the two countries also exist.

When dwellings fail to respond to residents' needs, housing will suffer from segregation and buildings will possibly be demolished ahead of their time. This paper focuses on the lack of variation in the sizes of dwellings as a factor in residential segregation. It examines this issue in the context of Finnish mass housing built in the 1960s and 1970s. The aim of the article is to review how mass housing layouts can be adapted to produce the currently absent flat sizes.