Tree Fox · Adelaide arborists

Bushfire Tree Management Adelaide: 20m Rule & Clearance

By Tree Fox · Published 5 May 2026 (updated 8 October 2026)

Last updated: 8 October 2026.

Bushfire tree management on Adelaide Hills and foothills properties is governed by three regimes that overlap: the regulated tree rules under SA planning law, the Native Vegetation Act 1991, and the Bushfire Protection Overlay. The most useful single rule for owners is the 20-metre exemption — a regulated or significant tree within 20 metres of an existing dwelling in a Medium or High Bushfire Risk area of the Hazards (Bushfire Protection) Overlay can generally be removed without development approval (SA Law Handbook). Confirm with council before relying on it — particularly for a large tree or one individually listed in the Planning and Design Code. Native Vegetation Act consent can still be required even where the regulated-tree exemption applies, particularly on rural and semi-rural blocks.

The exemption is real, the limits are also real, and getting it wrong can attract heavy penalties.

This is the fire-zone companion to the Adelaide Hills permits guide and the Mitcham foothills guide.

Where the Bushfire Protection Overlay applies

The overlay covers most of the Adelaide Hills, the Mitcham foothills (Belair, Blackwood, Eden Hills, Stonyfell, Beaumont edge), parts of Tea Tree Gully (Houghton, Inglewood, Highbury), and parts of Onkaparinga (Clarendon, Kangarilla). You can check your property’s overlay status on the PlanSA mapping portal — search the property address and look for “Bushfire” in the overlay list.

The overlay has internal categories:

General Bushfire Risk — the lighter risk band; fewer compliance constraints
Medium Bushfire Risk — the suburban-edge band; the 20 m exemption is available here
High Bushfire Risk — the highest-risk band; additional construction and clearance rules apply, and the 20 m exemption is available
Outside the overlay — the standard regulated-tree rules apply with no bushfire carve-out

Where you sit on this map determines which exemptions are available. A Belair property in Medium Bushfire Risk has the 20 m exemption available; the same trees on a Walkerville property outside the overlay don’t.

The 20-metre exemption — what it lets you do

The exemption, in plain English: a regulated or significant tree within 20 metres of an existing dwelling, in a Medium or High Bushfire Risk area of the Hazards (Bushfire Protection) Overlay, is generally exempt from the need for development approval (SA Law Handbook).

What’s covered:

Removal of a tree that would otherwise be regulated or significant, within the 20 m zone
Pruning of such a tree within the 20 m zone

What’s NOT covered:

Trees more than 20 metres from the existing dwelling (the carve-out is geographically tight)
Trees individually listed in the Planning and Design Code — confirm with council first
Trees on a property outside the Bushfire Protection Overlay
Native Vegetation Act-regulated clearance — even within the 20 m zone, some clearance still requires Native Vegetation Council consent on rural and semi-rural blocks (see below)

Keep records. If council asks about the work afterwards, you’ll want to show the tree was within 20 m of the dwelling and inside the overlay. Photos, measurements, the overlay map and any CFS advice or arborist notes all help. On larger Hills blocks, aerial property documentation across rural South Australia before and after the fuel-load work makes the rationale visible — particularly useful when the same trees are visited annually.

CFS site assessments and Bushfire Survival Plans

The Country Fire Service runs a free advisory service for property owners in fire-risk areas. The two key pieces of paperwork:

Bushfire Survival Plan. A document the property owner prepares (CFS provides the template) that records the property’s fire risk, the household’s response plan, equipment, evacuation triggers and stay-or-go decisions. Useful in its own right; also useful as evidence supporting the rationale for vegetation work.

CFS site assessment. A free on-site visit by a CFS officer who walks the property, identifies fuel-load issues, suggests vegetation work and discusses defensive space. The visit is non-binding advice — the CFS doesn’t issue compliance certificates — but the visit notes are useful as part of the documentation supporting any later vegetation work.

Neither document by itself authorises tree removal. Both are evidence that the work that follows is genuine fire-protection work, not landscaping under a fire pretext.

For arborist work specifically tied to a CFS-aligned plan, see arborist reports and the land clearing service page.

Annual fuel-load reduction work

What “annual fuel-load reduction” actually involves on a Hills property:

Crown lifting of trees within the defensive space — removing the lowest 2–3 metres of canopy so a ground fire can’t ladder up into the tree crown
Thinning out dense low understorey within the defensive space (acacias, native shrubs that have grown into a continuous fuel layer)
Deadwood removal from any tree within the 20 m zone
Long grass and fine fuel management — separate from arborist work, owner-managed
Maintenance of escape routes — keeping driveways and access tracks clear of low overhanging vegetation

Typical Adelaide Hills cost ranges for annual work:

Property profile	Typical annual cost
1/4-acre Hills block, single dwelling, moderate vegetation	$400–$900
Half-acre to 1-acre block, multiple mature trees	$900–$2,000
Larger Hills/rural property with extensive tree cover	$2,000–$5,000+
First-year intensive clearance (catch-up on years of neglect)	2–3× the ongoing annual rate

These ranges assume the work falls within an exemption (or involves trees that don’t need one at all). Trees outside the 20 m zone and Native-Vegetation-Act-protected vegetation sit outside this regime and are quoted separately.

Native Vegetation Act overlap in the Hills

The third regime — and the one that catches most Hills property owners by surprise.

The Native Vegetation Act 1991 (SA) protects native vegetation across most rural and semi-rural land in the state. “Native vegetation” includes individual native trees, native shrubs, and native ground cover that grew there naturally — not species you planted, not introduced ornamentals, not fruit trees, not hedges.

Where the Act applies: generally, anywhere outside the metropolitan Adelaide council area boundary. Hills properties are almost always inside the Act’s coverage. Foothills properties on the metro side of the council boundary (Burnside, Mitcham, Tea Tree Gully) are usually outside it.

The interaction with the bushfire exemption: the regulated-tree 20 m exemption operates under SA planning law. The Native Vegetation Act operates under separate legislation. Both can apply to the same tree.

A practical example: a 70 cm-diameter manna gum on a Native-Vegetation-Act property, 15 metres from the dwelling, in the Bushfire Protection Overlay.

Trunk circumference is roughly 2.2 metres — a significant tree under SA planning law
Within the 20 m zone — the planning-law bushfire exemption may apply (confirm with council)
Native vegetation under the 1991 Act — clearance may still require Native Vegetation Council consent

In this scenario, the planning exemption alone doesn’t settle it. The owner needs to confirm the Native Vegetation Act position too before any clearance.

The Native Vegetation Council process. Application via the Department for Environment and Water. Allow several weeks or more for an application. Bushfire-protection clearance is a recognised purpose, but it still requires the right approval unless an exemption applies.

A few clearance categories are exempt from Native Vegetation Council consent for bushfire purposes — see the Native Vegetation Regulations 2017 schedule of exemptions for the precise list. The exemptions are narrower than most owners expect.

Common mistakes

The recurring patterns that lead to compliance trouble:

Clearing beyond the 20 m zone. A row of mature gums at the back of the block, all removed in one weekend, some of them well past 20 m from the house. The exemption doesn’t stretch that far. The fix: measure first, and document what you removed and why.

Ignoring the Native Vegetation Act. The 20 m planning exemption doesn’t override the Native Vegetation Act 1991. An owner who clears native gums on a rural block relying on the planning exemption alone can still be in breach.

Assuming the exemption applies everywhere in the Hills. It doesn’t. The Bushfire Protection Overlay is mapped — properties outside the overlay have no bushfire exemption. Check before assuming.

No documentation. The owner who removes a regulated tree relying on the bushfire exemption, without photos or measurements showing it qualified, has little to point to if challenged.

Native Vegetation Act blindspot. Hills property owners commonly know about the regulated-tree rules and the bushfire exemption but have never heard of the Native Vegetation Act. The Act applies to most Hills properties and adds a separate consent requirement for clearance of native vegetation.

DIY chainsaw work in fire season. Total fire ban days restrict the use of tools like chainsaws outdoors — check the CFS rules before any work in fire season. Schedule fuel-load reduction work for autumn (late March through May) — the standard pre-season window.

For the broader regulatory picture see tree removal permits in Adelaide. For species-specific care of the eucalypts that dominate Hills properties, see eucalyptus tree care — most of the Hills’ “regulated trees” are gums.

When to call an arborist for fire-zone work

The cases where it’s worth getting professional help:

Any tree work near a powerline (see our trees near powerlines guide)
Any tree over 4 metres on a sloped Hills block
Any work on a regulated or significant tree, with or without the bushfire exemption
Pre-season fuel-load reduction across a multi-tree block
Documentation work — arborist reports, fire-protection rationale, work-plan documents
Storm-damaged tree work after a high-wind event

For routine work see the land clearing service page. For the broader Hills regulatory context including the Native Vegetation Act, see the Adelaide Hills location page.

FAQs about bushfire tree management in Adelaide

Can I clear trees near my house for fire safety? In a Medium or High Bushfire Risk area of the Hazards (Bushfire Protection) Overlay, a regulated or significant tree within 20 metres of an existing dwelling is generally exempt from development approval. Outside the 20 m zone, or outside those risk areas, the standard regulated-tree rules apply. Confirm with council before relying on the exemption. Native vegetation on rural and semi-rural blocks may also need separate Native Vegetation Council consent.

Does the 20 m rule apply to all my trees? No. It only covers trees within 20 metres of an existing dwelling, in Medium or High Bushfire Risk areas. Trees further from the dwelling need approval if they’re regulated or significant, and trees individually listed in the Planning and Design Code should be checked with council. And on Native-Vegetation-Act-covered properties, native vegetation may need separate Native Vegetation Council consent in addition to (or instead of) the regulated-tree process.

Do I need CFS approval for tree clearing? The CFS doesn’t issue clearance approvals — they provide free site assessments and Bushfire Survival Plan support, but the formal approval pathway is via PlanSA (regulated and significant trees), the council (development applications) and the Native Vegetation Council (where the Act applies). A CFS site visit is useful evidence that the work is genuinely fire-protection-related.

Are eucalypts within 20 m of my house exempt? Generally yes, if the property is in a Medium or High Bushfire Risk area. The eucalypt exclusion attaches to the 3-metre dwelling exemption, not the 20-metre bushfire exemption (SA Law Handbook). Confirm with council first, and check the Native Vegetation Act position on rural blocks.

What does annual bushfire compliance cost? Typical annual fuel-load reduction work runs $400–$900 for a quarter-acre Hills block, $900–$2,000 for a half-acre to one-acre property with multiple mature trees, and $2,000–$5,000+ for larger Hills/rural blocks. First-year intensive clearance (after several years of neglect) is typically 2–3 times the ongoing annual rate.

Sources

This article is general guidance for bushfire-protection tree work in South Australian conditions. For specific advice on a regulated or significant tree in a fire-zone property, get a qualified arborist and the council’s planning team involved before work starts.