TAS Land & Water Rules: What the State Actually Sets

Tasmania's shed rules stand out as more generous than most of the mainland — up to 108m² of outbuildings can be exempt from a planning permit on rural land. Dams and irrigation follow a more familiar pattern: a Water Management Act 1999 licensing system with narrow stock-and-domestic exemptions. This article covers what the state actually sets for dams, irrigation, and farm structures, before your specific council's planning scheme layers its own requirements on top.

Tasmania runs a single set of State Planning Provisions that apply consistently across the state (with council-specific local variations layered on in a schedule), which is why its shed exemptions are clearer and more generous than most mainland states. Water follows the more familiar Water Management Act licensing model. Each is covered as its own section below.

Dams & water storage: a specific small-dam exemption

Constructing, modifying or removing a dam in Tasmania generally needs a Permit to Undertake Dam Works under Part 8 of the Water Management Act 1999, administered by NRE Tas. A specific exemption applies for small, low-risk dams: dam works don't need a permit if the dam isn't situated on a watercourse, has a capacity under 1 megalitre, and there's no public or private infrastructure within 100m downhill of the works. This is a clear, numeric threshold rather than a case-by-case assessment.

A water licence is a separate requirement again: needed for taking water for agricultural or other commercial purposes from a watercourse or dam. Stock and domestic use is generally exempt from licensing, but with a genuine nuance worth knowing — that exemption for taking stock-and-domestic water from a dam only applies if a stream actually runs through or borders your property; non-riparian properties may need a licence even for basic stock and domestic use.

Irrigation & water extraction: a licence plus an allocation

Taking water for irrigation from a watercourse or dam for farming or other commercial purposes needs both a water licence and a water allocation — the allocation states a specific megalitre limit on the licence, and can come from establishing a new right to take water at a particular location, or by transferring an existing allocation from another licence. Conditions on the allocation can restrict where the water is taken from, where it's used, and what it's used for. A Dam Works Permit only covers constructing the dam itself — a separate water licence is still needed if you intend to fill that dam directly from a stream or by pumping from another water source.

Farm sheds & structures: generous rural exemptions

Tasmania's shed exemptions under the State Planning Provisions are notably more generous than Victoria's, Queensland's or WA's. For any zone, a small outbuilding is exempt from a planning permit if its roofed area is no more than 10m² (or up to 20m² combined if there's one other outbuilding on the lot), with no side longer than 3.2m. On Rural Living, Rural, or Agriculture zoned land with an existing dwelling, the exemption is far larger: total outbuilding floor area up to 108m² is exempt from a planning permit, provided height stays at 6m or under (wall height 4m or under) and setbacks meet the zone's standard. A further exemption applies specifically to genuine farm buildings tied to an agricultural use. Both exemptions fall away if the Local Historic Heritage Code applies to the land.

Planning approval and building approval are still separate questions, though: even a planning-exempt shed may need a Category 1 building approval, though a prefabricated farm shed under 200m² generally doesn't need a building permit or surveyor at all. At 200m² or larger, a building surveyor must issue a Certificate of Likely Compliance before work starts.

An important disclaimer, worth taking seriously

The Water Management Act licensing framework, the small-dam works exemption thresholds, and the State Planning Provisions shed exemption clauses (4.3.7–4.3.9) are all verifiable, state-wide facts. But whether your property is riparian, whether the Local Historic Heritage Code applies to your land, and how your specific council's local provisions schedule treats your shed all depend on your individual circumstances. Confirm directly with NRE Tas and your council before building a dam, applying for a water licence, or putting up a shed — our TAS land & water rules by council tool covers a growing number of them directly.

Frequently Asked Questions