Whatever you choose to call it: granny flat, studio, tiny home, home office – if you’ve been thinking about adding a small dwelling to your property, 2026 is the year to act.
New legislation that came into effect on 15 January this year has quietly changed the game for Kiwi homeowners. You can now build a self-contained granny flat of up to 70 square metres on your property without needing a building consent or a resource consent.
In this guide, we’ll walk you through everything you need to know – from the rules and what they mean, to why 70sqm is actually a brilliant size, and what a well-designed floor plan looks like.
What are the new 70sqm granny flat rules in NZ?
With the change in the Building and Construction (Small Stand-alone Dwellings) Amendment Bill, it’s now easier, quicker and less costly to build a small standalone granny flat in Auckland or anywhere in New Zealand without a consent.
Here’s what the rules require:
The design must be ‘simple’, a stand alone, single storey, 70sqm or less, using lightweight materials for the roof and frame, as well as straightforward plumbing and drainage systems. The dwelling must comply with every aspect of the Building Code, must be at least 2m from all boundaries and residential buildings and not exceed 4m and all building work must be carried out or supervised by licensed building professionals.
Before starting, you must apply for a Project Information Memorandum (PIM) to notify your council. This helps the council assess whether the proposed dwelling meets the exemption conditions and flag any natural hazards or bylaws. On completion, which must be within 2 years – you must submit final ‘Record of Works’, certificates, and plans, and notify the council. So they can keep records of the Contractors who completed the works ie Builders, Architects, Electricians etc.
One thing to be aware of:
While the 2026 changes remove the need for building and resource consents, they do not remove other council charges. Councils may still charge Development Contributions for an additional dwelling, to account for increased demand on local infrastructure.
Why 70sqm is the perfect size
A well designed 70sqm granny flat can offer far more than its footprint suggests, it’s a remarkably liveable amount of space. It’s enough room to include a decent kitchen, bathroom, living area, and one or two bedrooms. Without the build cost, maintenance, and complexity of a larger home.
With careful planning, natural light, clever storage and good indoor-outdoor flow to a deck or garden can make the 70sqm granny flat feel surprisingly spacious and welcoming.
A space for aging parents to live, a hangout space for kids, growing teenager, or adult children saving for their first home or guest accommodation for friends/family. It also makes a great home office away from the busy house somewhere you can leave your things just as you left them.
Building costs in New Zealand are significant, and every extra square metre adds up. Keeping your build at or under 70sqm not only meets the new consent exemption, it also keeps your project financially manageable.
Adding a well-designed 70sqm dwelling also adds long-term value to your property. Whether you eventually rent it out, Airbnb it, house family, or sell the property, a thoughtfully built secondary dwelling is an asset that keeps giving.
So what can I fit into 70sqm granny flat?
You may be surprised just how much can be achieved with thoughtful planning and clever design, making the footprint feel larger than it is. To give you a sense of what’s possible, here are two floor plan ideas…
Option 1 – One Bedroom:
For a single occupant or couple, a one-bedroom layout lets you be really generous with the living and dining space. Think open-plan kitchen and living that flows out to a deck, a proper-sized bedroom, walk in wardrobe and a well-appointed bathroom. Nothing feels compromised — it just feels like a thoughtfully designed small home.
Option 2 – Two Bedroom:
Two bedrooms within 70sqm is absolutely achievable with smart design. The key is keeping the layout efficient — bedrooms that are right-sized rather than oversized, an open-plan kitchen and living area, and a bathroom that works hard. This layout suits young couples, siblings, or a parent and live-in carer.
*These are indicative layouts only, and can be tailored to suit your specific section, orientation, and lifestyle needs.
Ready to build your Auckland Granny Flat? Let’s talk
A well-designed granny flat is more than just an extra building in your backyard—it’s an investment in your lifestyle, your family, and the future potential of your property. The rules have changed, the timing is right, and 70sqm is more than enough space to create something genuinely special on your property.
At X2 Interior Design & Construction, we’ve been helping Kiwi families design and build in Auckland for years — and a well-designed granny flat is one of the most rewarding projects we get to work on. Whether you’re housing family, creating a rental, or just making the most of your section, we’ll help you get it right from the ground up.
Got an idea brewing? Get in touch with the X2 Interior Design & Construction team — we’d love to hear about your project.