Main finding
Auckland's broad upzoning approximately doubled dwelling permits per capita within five years relative to a synthetic comparison.
43,500 of 97,000 permits over six years were attributed to reform
Can Zoning Reform Increase Housing Construction? Evidence from Auckland
Greenaway-McGrevy
Most important limitation
Permits are not completed homes, and the reform-attributed quantity is a counterfactual estimate.
From the publication
Inspect the authors' figure directly
Figure 5 · Synthetic and actual permits per thousand residents
Permits per resident tracked the synthetic comparison before reform, then rose sharply above it.
How this study is used
Claims this evidence supports
Reference
Greenaway-McGrevy (2026). “Can Zoning Reform Increase Housing Construction? Evidence from Auckland.”