Last year the Auckland Plan set a target for 70% of intensification to happen within the existing metropolitan urban area (note that includes greenfield land out to the imposed urban boundary). This was seen as a too radical step for many, something completely different from what Aucklander’s were used to and that would result in people being forced into apartments. The council ended up chickening out on the target and so included a fall-back position 60% intensification.
The debate on intensification heated up again earlier this year during the discussions on the Unitary Plan with again some people claiming that most people want to live on the
traditional mythical “quarter acre paradise”. However I’ve always been a bit sceptical about just how much sprawl has been occurring and back in January I looked at the building consent figures which showed that over 70% of the consents issued occurred within the existing urban area.
The first batch of detailed census data was released last week and as you would expect with the information, there is a lot of interesting results hidden within the figures. The first response of many when the data came out was understandably to look at where most of the growth has occurred – the answer to that was generally the CBD and some of the greenfield developments to in the Northwest and Southeast. The seemingly strong greenfield growth caused some to immediately question whether the councils compact city model was really the right direction for the city should be head – despite the compact city model being a forward looking plan and the census being a backward looking exercise.
However looking at where growth is occurring it can be very easy to overlook some key points. In particular a lot of low level growth across the suburbs may not look that important but it can easily add up to a significant amount when combined together. With that in mind and thinking about the intensification targets that were set I thought I would go have a look at what has happened population growth in a slightly different fashion to what has happened so far. To start with for each of the Auckland Census area units I have put them in to one of the following categories.
- City and Fringe – CBD, eastern Side of Ponsonby Rd, Newton, Grafton, Newmarket and Parnell.
- Metro Centres – e.g. Albany, Takapuna, Henderson, New Lynn, Manukau, Papakura.
- Suburban – Rest of the urban area.
- Mixed – Had some suburban development in 2006 however has also seen some greenfield development.
- Greenfield – Most of the population growth has through greenfield development.
- Rural – should be fairly self-explanatory.
- Rural towns – Settlements outside the existing urban area e.g. Pukekohe, Huapai, Warkworth etc.
Now admittedly it isn’t perfect and we really need the meshblock data to do this exercise properly but still it’s a useful indication. The results in the table below shows that while the suburban areas saw the least growth as a percentage increase figure, they did see by far the most overall growth and accounted for 51% of all the growth that did occur within the region. On the whole population growth within the existing urban areas of Auckland was 64% of all the growth that occurred while greenfield developments accounted for just 24% of the population growth. Perhaps unsurprisingly these results are similar to the building consent ones. What it does mean is that a target of 70% intensification is not only realistic but not that different from what has been happening in recent years.
Further, as you would expect this growth is having an impact on the density of the city. For each area unit I have rounded the density to the nearest 500 people per square km and use that to create a density profile for the region. The graph below shows that density profile for the entire region based on the percentage of people living in each of the density buckets. It indicates that the density curve is shifting higher while also flattening out with the change generally being less people living at lower densities and more people living at higher densities.
However the question is not just whether there are more people living at higher densities but whether the suburbs themselves are getting denser. To help answer this, the graph below shows the density profile based on the total number of people living in each density bucket. What this shows is that there are actually less people living in some of the lower density buckets. For example in 2001 almost 285,000 were living at a density of roughly 2500 people per km², by 2006 that had dropped to 247,500 and in 2013 is at just over 218,500.
What this suggests is that the density is changing due to the suburbs getting denser. It is important though to point out that at this stage that it’s unknown whether that is due to there being more dwellings, more people in each dwelling or less vacant dwellings. We will need to wait for future census data to come out before we can tell that.
One thing that is really noticeable is that there is an almost complete absence of people living in the medium-high densities. Something between the really high density seen in places like the CBD -which reaches over 10,000 people per km² and the low-medium densities in the suburbs. We should really be seeing a lot more people in the 4,500-6,000 range however we will need to address that in a separate post.
Based on what we know so far it is pretty clear that Auckland is getting denser and when you consider the change since 2001 the impact is quite substantial. One useful way of measuring density as a whole is to look at the weighted density which measures density based on what the average density that people experience rather than a simple calculation of total number of people divided by total land area. One of the reasons for using this metric is that otherwise you get some very odd results like that Auckland is more dense than the urban area of New York due to the large amounts of low density housing in places like New Jersey and Long Island. Based on the weighted density measure, the Auckland region comes in at roughly 2,650 per km² which is an increase of 17% over 2001.
One last point that is worth mentioning in all of this. Census area units are very broad and include parks, industrial areas and other pieces of land that can have negative impacts on density calculations. As such the figures in this post are very rough and we will need to wait for the more detailed meshblock data to emerge before giving more accurate results however it does mean that the density calculations are likely to increase. That more detailed data will also eventually allow us to look more closely at how we compare to other cities in NZ and overseas.
So Auckland has been getting denser already and the sky hasn’t fallen, someone should tell the residents of St Heliers and Milford that it’s ok to come out of their single storey houses now.