Source
https://www.building.govt.nz/assets/Uploads/getting-started/tiny-houses/tiny-houses-guidance-mbie.pdf — original source (opens in a new tab; the file is not redistributed)
Summary
MBIE Building Performance Tiny Houses Guidance (V5, January 2026) is the authoritative NZ government guidance document covering the regulatory framework for tiny houses across three legislative regimes: the Building Act 2004, the Resource Management Act 1991 (RMA), and the Land Transport Act 1998 (LTA). The central regulatory question is whether a tiny house is a “building” or a “vehicle” — a determination that dictates which act applies and what compliance is required. For tiny houses that are buildings, the document maps four consent pathways, five consent exemption tiers (including the Schedule 1A granny flat exemption new in V5 allowing up to 70m² without a building consent), and the interaction between Building Code compliance, RMA district plans, and council-specific minor dwelling rules. The RMA and Building Act use different definitions of “dwelling” — a THOW may be a vehicle under the Building Act but still a dwellinghouse under a local district plan, requiring resource consent. Rules vary materially by council; Tasman District Council must be checked specifically for the Neobiome pilot.
Key claims
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Building vs vehicle is the primary regulatory gateway — A tiny house is a “building” under the Building Act if it is immovable, permanently installed on land, and occupied long-term; a THOW that retains mobility and is not permanently connected is a “vehicle” subject to Land Transport Act requirements (WoF, registration) rather than building consent. The MBIE flowchart makes the determination explicit: connection to site services + immovability + long-term occupation = building even if on wheels. The regulatory consequences are fundamentally different: buildings require building consent (or an exemption); vehicles do not, but may still require resource consent under the RMA. REG_001
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Four consent pathways for tiny houses as buildings — (1) Standard building consent — available for any tiny house classified as a building; (2) Minor dwelling consent — self-contained unit on same site as a primary dwelling, often ≤60m², commonly a permitted activity under district plans; (3) MultiProof — MBIE pre-approved plans that streamline consent, and any qualifying BCA must accept them; (4) Relocated dwelling — s.112 Building Act applies and building consent is required for the relocation. For a community pilot seeking to construct multiple standardised units, MultiProof is the strongest pathway to reduce per-unit consent cost and processing time. REG_001
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Schedule 1 consent exemptions — four tiers, up to 30m², for standalone detached buildings — Exemption 3 (≤10m², no sanitary facilities, no potable water storage): no building consent, no LBP. Exemption 3A (10–30m², lightweight materials): no building consent, no LBP. Exemption 3B (10–30m², any materials): no building consent, LBP required. Exemption 43 (10–30m², kitset/prefab): no building consent if a chartered professional engineer reviewed the design. Critical limitation: Schedule 1 exempt buildings cannot contain sanitary facilities or potable water storage — ruling all four tiers out as standalone self-contained dwellings. REG_001
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Schedule 1A granny flat exemption (new in V5) — up to 70m² without a building consent — The most significant V5 change: standalone dwellings up to 70m² may be built without a building consent if classified as Housing (detached dwelling), designed and built under LBP supervision, and council is notified both before construction begins and after completion. All Building Code requirements must still be met. This is the most practically relevant consent-free pathway for community housing: a well-designed 70m² dwelling is viable as a full primary residence and qualifies under Schedule 1A. REG_001
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Building Code compliance is mandatory regardless of consent pathway — All building work, including consent-exempt work under Schedule 1 and Schedule 1A, must comply with the Building Code (structural stability, fire safety, access, moisture control, durability, services, and energy efficiency). Waivers and modifications of specific clauses are available via territorial authority consent conditions — for example, Clause F4.3.1/F4.3.4 (barrier height may not be practical in very small spaces) and G7.3.2 (visual awareness of the outside environment may not be achievable in tiny sleeping spaces). Building Code compliance without consent does not reduce quality obligations. REG_001
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Specified intended life (s.113 Building Act) — legally consented transitional housing — TAs may grant building consent for a building with less than a 50-year intended life, on condition the building is altered, removed, or demolished before the end of that period. This pathway enables legally consented temporary or trial housing arrangements — directly relevant to a phased community pilot seeking temporary-use approvals as a precursor to permanent establishment. REG_001
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RMA and Building Act carry separate definitions — dual compliance risk — The RMA s.2 defines “dwellinghouse” as “any building, whether permanent or temporary, that is occupied in whole or in part as a residence” — broader than the Building Act’s definition of “building.” A THOW cleared under the Building Act as a vehicle may still constitute a dwellinghouse under a local district plan and require resource consent. District plan rules differ materially by council; a design compliant under one council’s plan may require resource consent under another’s. REG_001
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Minor dwelling rules — self-contained units as permitted activity — Minor dwellings (self-contained residential units on the same site as a primary dwelling) commonly fall within district plans as permitted activities, requiring no resource consent. Specific size limits and conditions vary by council. This is a direct pathway for ancillary community units where a primary dwelling already exists on site — but Tasman District Council rules must be confirmed separately. REG_001
Research targets
Documents to retrieve
- RT_083 (doc): Tasman District Council district plan — tiny house, minor dwelling, and papakāinga rules applicable to the pilot location (Lower Moutere area). Required to confirm which consent pathways are available and whether minor dwellings are permitted activities in the relevant zone. REG_001
Research gaps
- RT_084 (gap): Tasman District Plan: specific conditions for minor dwelling permitted activity status — maximum floor area, setback rules, density limits, and servicing requirements. Required for NI D04 consent pathway recommendation for the Tasman pilot. REG_001
EDT connections
- D04 Sustainable Habitat & Building Technology — all key claims directly feed D04 regulatory analysis for tiny house construction pathways in NZ. Schedule 1A granny flat exemption, MultiProof, and s.113 specified intended life are the three most relevant mechanisms for Neobiome pilot design.
Connections
Referenced by
Sources (3): OT_102 · OT_129 · OT_136
EDT domains (1): D04: Sustainable Habitat & Building Technology