By Alan McMahon*
Affordable housing is in the news again as the government responds to the Productivity Commission’s 2010 report and the associated debates around the RMA, intensification, land supply, development contributions and so on.
The land supply argument rests on the contention that developers will sell their product more cheaply if the cost to develop is reduced and there is more competition from other developers offering similar products.
An examination of the market throws this assertion into doubt.
Our knowledge gathered through independent research, which involves examining historic data on house sales and rentals, suggests that the government response touches on all the key issues, and will help nudge the market towards some solutions.
However one of the key planks of the strategy, increasing land supply, may do little to help on its own.
Currently the most commonly sold dwelling in Auckland is a three bedroom standalone dwelling. But, the predominant type being built for sale is a four bedroom standalone dwelling.
Similarly, records of houses being rented show that more three bedroom houses are rented in greater Auckland than any other type, except in the former Auckland City area where two bedroom dwellings are more commonly rented than any other type.

The reason why larger houses are continuing to dominate the new build landscape is that they are the most profitable.
Single storey construction is cheapest, and there are enough people in the market at any time to absorb the new houses being offered for sale.
However we can be pretty certain that the buyers of these large new houses are already property owners.
It is not the responsibility of private property developers to provide affordable housing. Their job is to maximise profits, and they do that very effectively by giving that section of the market that can afford to buy, what it wants.
The vast majority of potential house buyers who can’t afford big new houses are not catered for at present to any significant extent.

So the danger is that as new land is released, particularly greenfield sites some distance from urban nodes, it will be developed in a style and at a price point that only enables existing house owners to buy. Generally speaking these sites are well suited to this form of dwelling as the market will not find medium or high density housing attractive in these somewhat remote locations.
What we should be attempting is to prioritise the release of sites for which the highest and best use is medium or high density dwellings. These will typically be brownfields sites close to urban nodes or to the CBD.
Developers will not reduce their prices unless they have to.
If the consequence of more efficiently processed resource consent applications is less overall cost and time to develop, then the initial impact will be that developers make more profit, and the secondary effect, perversely, may be increasing land costs.
Relying on competition to reduce prices and increase choice in a market which looks to be chronically undersupplied for some years hence, is optimistic.
Decreasing development costs need to be accompanied by real and significant increased brownfield and greenfield land supply if this unintended consequence is to be avoided.
Council or government’s ability to control these unintended consequences is through regulation.
In Auckland that is most clearly going to be via the new Unitary Plan. The balancing act facing Auckland Council in particular is to direct development towards providing choice and affordability through zoning while not unduly restricting developers’ ability to do their job.
Affordability can be calculated using house price or rental cost information and household income data, for any suburb or area. This directs developers (and councils) to the dwelling types and price points that will be feasible in any given location.
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Alan McMahon is the national director for research and consulting at Colliers International. You can contact him here »
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