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Adaptive reuse processes aim to preserve heritage values while creating new values through the architectural interventions that have become necessary. This claim provokes a discussion about the meaning of values, how we can preserve them in practice and how we can translate them into architectural qualities that users experience. Riegl's understanding of the different perspectives of heritage values in the past and present opens up the possibility of identifying present values as a reflection of current social, material and political conditions in the architectural discourse.

This qualitative and practical study compares two Belgian projects to trace the use of values in adaptive reuse projects from an architectural design perspective. The Predikherenklooster, a 17th-century monastery in Mechelen that now houses the public library, and the C-Mine cultural centre in Genk, a former 20th-century coal mine, are compared. The starting point is Flemish legislation, which defines significance through values, distinguishing between 13 heritage values.

The study demonstrates the opportunities that axiological questions offer during the design process of an adaptive reuse project. They provide an overarching framework for tangible and intangible aspects that need to be discussed, particularly in terms of the link between what exists, the design strategy and their effect.

Adaptive reuse can draw on approaches from both heritage conservation and contemporary architecture and explore values as a tool for “re-designing” built heritage.

This paper acknowledges the limitations of conventional heritage conservation, where the reuse of iconic modern houses as museums or exhibits often sacrifices their original residential function. We explore four aspects of the narrative approach – significance, reversibility, expandability and craftsmanship – to assess its potential for preserving and allowing change over time in the modern house.

Four iconic modern houses are analysed in this study: Villa Tugendhat-Brno frozen as a museum house, Chabot Museum-Rotterdam refunctioned as an art museum, Haus Schminke-Löbau used as a guest house and Maison Guiette-Antwerpen still in use. Employing aspects of the narrative approach (Walter, 2020a, b), the analysis evaluates recent heritage management practices in preserving the building’s multifaceted history and associated perspectives.

The narrative approach in heritage conservation values the evolving significance of cultural heritage by recognising different perspectives and preserving the traces of past changes. It promotes sustainability by enabling adaptive reuse while preserving historical integrity by respecting past and future heritage. Despite its obvious weaknesses, such as potential subjectivity, the dilution of valuations and the loss of historic fabric, it particularly responds to the ephemeral nature and challenges of modernity.

The cross-case analysis of practical conservation approaches, encompassing varied strategies for conservation and adaptive reuse, offers valuable insights for theorizing the significance of modernist architecture for both the present and future.