On 15 January 2026, new legislation came into effect which now makes it easier for Christchurch homeowners to add a small, standalone “granny flat” without needing a building or resource consent — provided strict criteria are met. These consent-exempt dwellings must be single-storey, no larger than 70sqm, purpose-built, and constructed to full New Zealand Building Code standards under the supervision of a Licensed Building Practitioner. This change could be a great opportunity for homeowners looking to accommodate family or create flexible living space, guest accommodation or workspace, while reducing some of the time and cost traditionally associated with consents.
Things to consider
Importantly, “consent-exempt” does not mean unregulated. Converted garages, sleepouts, cabins, or additions to the main home generally do not qualify, and design limitations around height, setbacks, services, drainage, and construction methods still apply. Factors specific to Christchurch such as ground conditions, flood management areas and infrastructure capacity must also be considered. Homeowners are also required to obtain a Project Information Memorandum (PIM) from council before building, which outlines site constraints and hazards, placing responsibility firmly on owners and their professionals to ensure compliance.
Plan to succeed
For many property owners, the new rules create a genuine opportunity to add value and flexibility — but success depends on early planning and understanding whether a consent-exempt build is right for the site and intended use. Seeking advice upfront helps avoid costly mistakes, protects future insurability and resale, and ensures any new dwelling is a sound long-term asset.
For more information, check out the Christchurch City Council website here.