Tiny Home Laws Western Australia 2026: Guide

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Western Australia is currently the most permissive state for secondary dwellings and tiny homes in Australia. In 2024, WA removed the planning approval requirement for ancillary dwellings under 70m² — a reform that has made WA the easiest state in the country to build a secondary dwelling. This guide covers everything WA tiny home owners need to know in 2026. For the national overview, see our Australian tiny home laws guide.

WA’s 2024 Secondary Dwelling Reform

In 2024, the Western Australian government removed the requirement for planning approval for ancillary dwellings (the WA term for secondary dwellings or granny flats) under 70m². This means homeowners in most residential zones can now build a secondary dwelling without any council involvement at all — just a building permit from a private building certifier. This reform makes WA the most straightforward state in Australia for building a secondary dwelling. For full details on WA’s building framework, see the WA Department of Building and Energy.

WA Ancillary Dwelling Rules 2026

  • Maximum floor area of 70m² — the largest fast-track limit of any Australian state
  • Must comply with the National Construction Code including energy efficiency requirements — see NatHERS for energy rating scheme details

Building Permit Still Required

Removing the planning approval requirement does not mean you can build without any approval at all. A building permit from a registered building certifier is still required for all fixed ancillary dwellings in WA. This covers structural safety, fire safety, energy efficiency and NCC compliance. Always verify your builder holds a current registration before signing any contract.

Tiny Houses on Wheels in WA

A THOW in Western Australia is classified as a caravan and does not require a building permit. Permanent residential occupation of a THOW on a standard residential lot is not generally permitted without specific council approval. See our national THOW guide for options across WA.

Renting Out Your Ancillary Dwelling in WA

Approved ancillary dwellings in WA can be rented to anyone — there are no occupancy restrictions. The Residential Tenancies Act 1987 (WA) governs tenancy arrangements for secondary dwellings rented to long-term tenants.

WA Approval Costs and Timeframes 2026

Approval Stage Cost Timeframe
Building Permit (Certifier) $1,500 – $4,000 2–4 weeks
Planning Approval (if triggered by overlay) $1,500 – $5,000+ 4–12 weeks

Related Guides

Last updated: April 2026. Always verify current WA requirements with your local council and a registered building certifier before proceeding with construction.