Driven by land financialization, urban renewal often relies on demolition to unlock value. This essay proposes an Expanded Shearing Layer Model that enables vertical growth beyond existing envelopes. Using Gilbey’s Yard as a case study, it shows how non demolition renewal can increase density while preserving embodied energy and identity.

Driven by land financialisation, demolition and reconstruction have become the dominant strategies of urban renewal, treating buildings as static commodities to be replaced in order to unlock land value. Existing adaptation theories, such as Brand’s Shearing Layer Model, explain the evolution of internal building systems but assume that change occurs within a fixed envelope. As a result, they are ill-equipped to address the “volume crisis”, where demands for increased density exceed the volumetric and structural capacity of existing buildings.

To address this limitation, this paper proposes the Expanded Shearing Layer Model, which introduces an external growth layer that enables buildings to expand beyond the constraints of their original envelope. Using Gilbey’s Yard as a case study, the research identifies the adaptive limitations of the existing structure and evaluates the feasibility of vertical expansion. The proposed model is then applied as a framework for a speculative design strategy based on non-demolition renewal.

The paper argues that reimagining buildings as open and evolving infrastructures, rather than closed and finite objects, offers an alternative to demolition-led redevelopment. By enabling growth while retaining existing structures, the model supports increased urban density, preserves embodied carbon, and maintains urban identity.