Incremental densification: impacts of deregulated planning on residential and urban morphologies in London, UK

This paper examines how deregulated planning, particularly Permitted Development Rights (PDR), has reshaped residential and urban morphologies in London through incremental adaptations. Using morphological and visual analysis across two contrasting London districts, the study documents how small-scale extensions–rear, side, and rooftop–accumulate over time to generate new hybrid typologies. While intended to remain invisible, these interventions produce a form of morphological informalisation within a formally regulated context. The findings reveal how soft densification transforms dwelling types, block structures, and visibility in the cityscape, highlighting the role of residents as co-producers of urban form.