Granny flat
Christchurch is gearing up for a granny flat boom as consent rules change.
Following landmark changes to national planning and building regulations that came into effect last month, property owners can now build new standalone homes of up to 70 square metres dwellings – commonly known as granny flats – without needing formal building or resource consents, provided they meet specific criteria.
The changes stem from the Building and Construction (Small Stand-alone Dwellings) Amendment Act 2025 and accompanying national direction under the Resource Management Act. Together, these reforms remove two of the biggest impediments to granny flat construction: lengthy consent processes and the associated costs. Homeowners must still ensure that the structure meets the New Zealand Building Code, and that all work is carried out or supervised by licensed building practitioners, with the local council notified both before work begins and after completion.
For Christchurch residents, where demand for flexible housing options has soared in recent years, the reforms offer fresh opportunities. Minor residential units, now permitted throughout residential zones when conditions are met, can house family members, generate rental income, or provide adaptable spaces for home offices and studios.
However, the changes have prompted caution from some corners. There is a concern that without careful adherence to the new standards, poorly constructed or non-compliant units could emerge, potentially undermining safety and neighbourhood character.
Despite this, supporters argue the overhaul will help ease housing pressures and unlock tens of thousands of additional dwellings nationwide over the next decade, while giving Christchurch families more control over their properties.
WHAT YOU NEED TO KNOW
- As of 15 January 2026, construction of, or additions to, granny flats up to 70 square metres in Canterbury do not require building or resource consents.
- These dwellings must be single-story, detached, and meet the Building Code.
- Owners must still notify their local council before starting, use qualified professionals, and comply with zoning.
- For more information, go to the Christchurch City Council website at ccc.govt.nz.
