The new building consent exemptions are:

Single-storey detached buildings: Single-storey detached buildings that include sleep outs, sheds, greenhouses and other similar structures. The new exemptions increase the size of a single-storey detached building to a maximum of 30 square metres.
Ground-mounted solar array panels: These exemptions depend on whether you live in an urban or rural area. If in a rural zone, there will be no restrictions in panel size that can be built without a professional.
Carports: Carports up to 40 square metres in size.
Awnings: Awnings of up to 30 square metres on a ground floor.
Verandas and porches: Verandas or porches of up to 30 square metres on a ground floor.
Outdoor fireplaces or ovens: No consent is needed for an outdoor fireplace or oven built up to a maximum height of 2.5 metres, and with a maximum cooking surface of 1 square metre. The fireplace or oven must also be at least one metre away from any legal boundary or building.
Flexible water storage bladders: You won’t need consent for flexible water storage bladders, for irrigation or firefighting purposes up to 200,000 litres in storage capacity.
Small pipe supporting structures: These can be built without consent if they only carry water and are on private land.
Short-span (small) bridges: Can be built without a consent if the general public cannot access it, and it doesn't span a road or rail area.
Single-storey pole sheds and hay barns: A single-storey pole shed or hay barn in a rural zone can be built with a maximum floor area of 110 square metres.