Why Some Cities Can Build And Others Cannot

Two markets facing identical demand growth can produce very different rent outcomes. The difference is usually how easily each can add new dwellings.

Physical constraints come first

Coastlines, mountains, water bodies and protected land physically limit where building can occur, and no policy change removes them.

A city constrained on several sides has a finite developable area, and once it is largely built out, additional supply requires building more densely rather than more widely.

Cities on open terrain face no such limit at the edge, which means supply can respond by expanding outward as long as infrastructure follows.

Regulation is the larger variable

Zoning determines what can be built where, and in many places the permitted density is well below what the market would support.

Approval processes add time and uncertainty, and the uncertainty matters as much as the delay because it affects whether projects are attempted at all.

Requirements attached to approval, including infrastructure contributions and design conditions, raise the cost threshold a project must clear to proceed.

Where approval can be challenged by third parties, the delay is open-ended, and that possibility alone deters projects that would otherwise be viable.

Infrastructure sets the practical boundary

Land beyond existing water, sewer and transport networks cannot be developed until those networks extend, and extension is a public investment decision.

This makes supply responsiveness partly a function of how willing and able local government is to fund expansion.

Where infrastructure lags, land that appears available on a map is not actually developable in any relevant timeframe.

Capacity limits inside existing networks have the same effect, since a treatment plant at capacity blocks connections regardless of how much land is zoned.

How this shapes rent behaviour

In a responsive market, rising demand produces construction, and the new supply moderates rent growth over the following years.

In a constrained market, the same demand meets a fixed stock, and the adjustment happens through price rather than through quantity.

The consequence is that constrained markets tend to show larger rent movements in both directions, since supply cannot absorb changes in demand.

Constraints are not permanent

Regulatory constraints can change, and a number of jurisdictions have revised zoning and approval processes with the express aim of increasing supply.

Changes of this kind take years to affect delivered supply, because the pipeline itself is long, so the effect appears well after the policy.

Assessing a market therefore means looking at both the current constraints and the direction of policy, since the two can point differently.