Granny Flat / Minor Dwelling cost in Wellington (2026)
Typical Wellington range
$32,000 – $368,000
Most Wellington projects land around $158,000 – $263,000. Prices run around the national average, with site costs the swing factor.
Why Wellington differs
Wellington's Very High and Extra High wind zones and seismic foundations add bracing and engineering most flat sites elsewhere don't need.
Usually included
- Foundation & build
- Cladding & roof
- Kitchen & bathroom (for a self-contained unit)
- Interior fit-out
Usually excluded
- Services connection to the main house
- Site works & retaining
- Driveway & landscaping
- Consent fees (where required)
Sometimes needs a building consent
Under recent rule changes (2025–2026), a standalone single-storey dwelling up to 70m² may be built without a full building consent if it meets the Building Code, is designed and built or supervised by Licensed Building Practitioners, meets boundary and height limits, and you first obtain a Project Information Memorandum (PIM). Larger or non-complying builds still need consent — confirm the current rules with your council. Read the consent rules →
Questions to ask before you sign
- Does this build qualify for the 70m² consent exemption, or do we need consent?
- What's included for connecting services to the main house?
- Is an LBP supervising, as the exemption requires?
Wellington granny flat / minor dwelling: common questions
- How much does a granny flat cost to build in NZ in 2026?
- A self-contained minor dwelling typically costs $150,000–$280,000 — around $3,000–$5,000 per m². A 50m² unit is roughly $250,000 including consents and services. A sleepout with no kitchen or bathroom can be far less.
- Do I need a building consent for a granny flat in 2026?
- From 15 January 2026, a single-storey standalone dwelling up to 70m² can be built without a building consent if it meets the Building Code, is LBP-supervised, sits 2m+ from boundaries and is under 4m high. This can save $5,000–$15,000 and several weeks.
Before you pay anyone, check who they are.
Check the company that quoted you: company status, registration and what's on the public record, from the official NZ sources.
Check a builderActually starting this build? Keep watch on your builder for the whole build →