Free tool
Does my retaining wall need a building permit?
Victoria exempts one narrow class of retaining wall from needing a building permit — item 15 of Schedule 3 to the Building Regulations 2018, and it is a three-condition test, not a height rule. Answer the questions and the checker walks them in the order that settles it fastest.
The checker
Interactive checker
The step-by-step checker runs in your browser and needs JavaScript. Everything it asks is written out below in the tests in full — the same conditions, the same thresholds, in the same order.
Question 1 of 4
The rule itself
The tests in full.
Item 15 is one sentence with three conditions, and every one of them has to hold at once. Miss a single condition and the exemption is gone — at any height, in any material.
The opening words
The work has to be constructing a retaining wall
Item 15 exempts "any retaining wall" meeting its conditions — the structure in its finished state. Replacing a wall outright is construction and is tested the same way. Repairing part of an existing wall sits under item 3 instead, which requires like-for-like materials and excludes underpinning, replacement of footings, any change to height, and any work removing or altering an element that supports another — which is why so many wall "repairs" are really replacements. Taking a wall down is demolition under item 2, on different tests again.
"less than 1 m in height"
Under 1 metre — strictly
Less than, so a wall built to exactly 1 m is outside the exemption. The Regulations give no measuring rule for a retaining wall — the defined "height" terms cover buildings, building walls and fences, none of which fits — so in practice height runs from natural ground level at the base of the wall on its exposed side to the top of the wall, at the highest point along the run. Natural ground level is the ground in its pre-development state, not the top of the fill the wall holds. Regulation 7 applies the prescribed values subject to tolerances, so a wall on the line is a matter for the surveyor rather than a tape measure. Terraced walls stepped close together on one slope can act, and be assessed, as a single wall of their combined height.
"not associated with other building work"
It has to stand alone
A wall of any height is outside the exemption when it is associated with other building work: the cut or fill for a house, garage or shed slab, a swimming pool or spa, a deck, a driveway that belongs to a building job — or supporting any of them. A 600 mm wall under a garage slab needs a permit; a 600 mm garden bed wall in the middle of the yard generally does not. "Associated with" is broad, and it is judged on what the wall is actually for, not on what the invoice says.
"or with protection of adjoining property"
It cannot be protecting the neighbour's property
The third limb removes any wall associated with protection of adjoining property. The everyday case is a wall holding up the neighbour's ground — the standard arrangement on subdivided and cut-and-fill estate blocks, where two house pads meet at a step — but the words are wider than that paraphrase, and they sit alongside the protection-work regime in Part 7 of the Building Act. It is the title boundary that decides whose ground the wall retains, and the title boundary does not always follow the fence.
Column 3 — "Parts 3 to 19 except regulation 119"
What an exempt wall keeps
Item 15's column 3 is narrower than the shed exemption's "All Parts", and the difference is the point. An exempt wall is still subject to Part 2 — the Part that adopts the Building Code of Australia — and to regulation 119, under which the municipal building surveyor may require the owner of an allotment to provide retaining walls or other means of maintaining the stability of the soil where the ground on the allotment or an adjoining property has been, or may be, adversely affected by excavation or filling of soil on the allotment. An owner must comply with such a requirement — unless the owner is instead required to provide protection work in relation to the adjoining property under regulation 111. Regulation 23 is what removes the building permit requirement for work the Schedule lists; the Schedule's own heading cites regulations 23, 185 and 279.
The free check
Close to any line? Send it in.
You do not need a permit to ask whether you need one. Send the heights along the wall (a photo with a tape measure in shot does it), a site plan or marked-up aerial showing boundaries and easements, what sits on or behind the wall, and the address — a registered building surveyor will tell you where the wall lands, at no charge. Or ring the surveyor on (03) 9802 9459. Mon–Fri, 9:00 am – 5:00 pm. We aim to reply within one business day.
Get a quote
Wall needs a permit? One fixed fee, quoted first.
Send the heights, a site plan and the engineer's drawings if you have them. We confirm whether a permit is needed and, where it is, quote a fixed fee for the permit and the inspections.