Tasmania Granny Flat Rules: The 90sqm Proposal in 2026

Tasmania’s proposed 90 m² granny flat allowance was still recorded as an amendment under assessment when we checked the Commission record on 2 October 2026. Don’t treat the proposal as an operative permission for a larger secondary residence. Confirm the provisions applying to your property and application.

By The Granny Flat Guide Team. Updated 2 October 2026. About our research.

What the amendment record shows

The Commission record for SPP amendment 01/2026 describes a proposed increase in allowable gross floor area from 60 to 90 m². Exhibition ran from 10 June to 22 July 2026. The record subsequently lists September hearing dates and directions; its decision section contained no published decision at our check.

That is a statement about the record we inspected, not a guarantee that the page captures every later development. Follow the official record and ask the planning authority which provisions are in force when preparing an application. The article’s URL mentions 90sqm because that is the reform readers are following; the wording of a URL is not evidence that a change has commenced.

Check the existing property requirements

Give the council a property address, site plan and description of the intended use. Ask whether the proposal meets the current definition of a secondary residence and which assessment route applies. Establish the floor-area measurement method before selecting a supplier model.

Don’t assume that a dwelling under an area threshold is automatically approved. The location on the lot, existing buildings and mapped constraints still need investigation. Keep the written advice with your proposed drawings.

Explore a larger layout without committing to it

A larger footprint can provide more room for circulation, storage or a second bedroom. But it also occupies more of the site and changes the building and service scope. Begin with the needs of the intended occupants rather than filling every possible square metre.

If you want to compare a design under the current framework with a larger option, ask the designer to quote that comparison explicitly. Two full drawing packages can cost more than one. Decide how much preliminary work is useful before the planning position is settled.

Our two-bedroom layout guide helps compare room arrangements. Its concepts are not Tasmanian approval drawings. Test furniture, bathroom access and privacy within the actual permitted footprint.

Separate the building specification from planning reform

Ask a building surveyor which building requirements and approval process apply to the project. Confirm the relevant National Construction Code edition and energy compliance route, plus the structural and service information required for the site. A proposed planning-size change does not answer those questions.

For a prefab unit, establish who prepares the foundation and installation design and who coordinates inspections. For a kit, identify the assembly contractor and any additional engineering. Browse our prefab directory or kit directory once the supply scope is clear.

Price the address and document the assumptions

We don’t have a verified Tasmanian finished-build average. Request quotes for the selected design with delivery, foundations, connections, approvals and fit-out separated. A Hobart hillside and an accessible level site can involve different work even with an identical module.

If a quote assumes a future planning change, make that condition explicit. Ask what happens to deposits, drawings, production slots and price validity if the change is delayed or differs from the draft. Don’t rely on a verbal assurance that the larger dwelling will be permitted by delivery day.

Use the cost calculator to organise assumptions and our quote guide to compare scope. Replace estimates with written prices as the property investigation progresses.

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