Researchers Unveil Free Granny Flat Plans to Aid Families

Homeowners in New Zealand will soon benefit from free architectural plans for granny flats, thanks to a new initiative led by researchers at Auckland University. The project aims to leverage the recently enacted Building and Construction (Small Stand-alone Dwellings) Amendment Act 2025, which allows homeowners to construct these smaller dwellings without the need for standard building consent starting from January 15, 2026. The initiative, funded by Branz with a grant of $220,000, will provide open-source designs aimed at enhancing intergenerational living options.

Leading the project is Professor Anthony Hōete, who is of Ngāti Awa descent. According to Hōete, these plans, which will accommodate buildings up to 70 square metres, are designed to meet the needs of various family structures. He notes, “They could be for kaumātua [respected elders], it could be transitional housing. Maybe the kids want a couple of extra rooms outside.” This initiative addresses the issue of overcrowding in main residences, providing a viable living option for families.

The research team will start by analyzing 1,000 different properties to better understand current living arrangements and land usage. They plan to develop a selection of designs, complete with detailed drawings and specifications, which will be available for download at no cost. Hōete’s team is collaborating with Context Architects, known for their experience in creating affordable housing solutions for Kāinga Ora.

The anticipated construction cost for these granny flats is estimated to range from $3,500 to $4,000 per square metre, keeping the total for a typical flat under $300,000. Some designs will specifically focus on universal accessibility, ensuring that they cater to individuals with disabilities and the elderly.

Hōete expressed enthusiasm about the timing of the project, stating, “This is going to give people tangible options where they can be a little bit self-empowered. They can choose from a suite of schemes.” He believes this initiative will empower families to take control of their housing solutions, especially following the economic challenges experienced in recent years.

The granny flat project is part of a broader funding initiative that allocates $11.5 million from the Building Research Levy to support various innovative housing projects. The Building Research Levy, set at 0.1% of all building consents over $20,000, is administered by an independent group that selects projects aimed at reducing construction costs and improving sustainability in New Zealand’s housing sector.

Other notable projects funded in this round include “Whakamaru i te Rangatahi,” which focuses on housing solutions for young people and families, and “Architecture for All,” which aims to enhance equity in housing design using artificial intelligence and family-centered approaches.

The new granny flat legislation is expected to significantly increase housing supply, with projections estimating the construction of approximately 13,000 granny flats over the next decade. This initiative was part of the coalition agreement between the National and New Zealand First parties, reflecting a commitment to addressing housing shortages in the country.

Overall, the initiative by Auckland University and Branz represents a proactive step toward creating affordable and sustainable housing options for families in New Zealand. By making architectural plans readily available, the project aims to facilitate better living arrangements and foster intergenerational connections within communities.