Main finding
A broad reform covering roughly three quarters of residential land produced a large increase in permitted homes relative to non-upzoned areas.
21,808 additional permitted homes over five years
The Impact of Upzoning on Housing Construction in Auckland
Greenaway-McGrevy & Phillips
Most important limitation
Permits are not the same as completed or net new occupied homes.
From the publication
Inspect the authors' figure directly
Figure 6 · Estimated treatment effects on dwelling permits
The estimated effects become positive after the reform for both attached and detached homes.
REDRAWN FROM STUDY DATAFigure 6 · Estimated treatment effects on dwelling permits
| Years relative to reform | All dwellings | Attached | Detached |
|---|---|---|---|
| −4 | -0.05 | 0 | -0.02 |
| −3 | 0 | -0.02 | 0 |
| −2 | 0.02 | 0 | 0 |
| −1 | 0 | 0 | 0 |
| 0 | 0.1 | 0.05 | 0.04 |
| +1 | 0.25 | 0.15 | 0.1 |
| +2 | 0.45 | 0.3 | 0.15 |
| +3 | 0.75 | 0.55 | 0.2 |
| +4 | 1.15 | 0.85 | 0.28 |
| +5 | 1.45 | 1.05 | 0.35 |
How this study is used
Claims this evidence supports
Reference
Greenaway-McGrevy & Phillips (2023). “The Impact of Upzoning on Housing Construction in Auckland.”