The draft Spatial Plan assumes that about 14% of property owners in upzoned areas will build additional homes on their properties. This means we need to upzone a larger area in order to ensure enough housing gets built to meet Wellington’s needs.  The 14% is because the government cannot force owners to sell their property and / or make the large capital investment to develop it into housing. The conditions have to be right for people to choose do so. Further, all areas that can be 15-minute neighbourhoods – close to amenities and able to offer people a good life – should accommodate lots of people. So these areas should be upzoned unless there’s an extremely strong public-good reason not to.