Overcoming the “fear of density”: Vegetational diversity in residential developments in the densifying city

The pressure for more affordable housing has resulted in intensification of residential development and biodiversity loss. Using seven medium-density housing developments in three New Zealand cities, we explore the relationship between medium-density and greenspace quality. We also compare the sites pre- and post-development to determine the extent of loss of permeable space.

In six developments for which we had pre and post-data, percentage loss ranged from 12% to 67%. The development with the highest housing density (82 units/ha) had very poor vegetation quality. However, there was no correlation between density and vegetation quality for those with less than 60 units/ha, indicating potential for improving the ecological value of permeable areas. Medium-density developments prioritising communal space had the highest provision of permeable space.

We offer some recommendations on the application of biodiverse-sensitive design and planning principles to support biodiverse human living environments.