Do I need council approval for a retaining wall in NSW?
The NSW rules for retaining walls, cut and fill and other structural support, cited to the clause, and a free check of your lot.
In NSW a retaining wall needs no council approval if it is exempt development: no higher than 600 mm, cut or fill no more than 600 mm, at least 1 m from every boundary and from any easement, sewer main or water main, at least 2 m from any other retaining wall, at least 40 m from a natural waterbody, and it meets every other standard below. Anything higher needs a complying development certificate or a development application, and usually an engineer's design.
Exempt if it meets every standard
From Codes SEPP Part 2, Division 1, Subdivision 15 (clauses 2.29 and 2.30), plus the general requirements in clause 1.16 (it must meet the Building Code of Australia and must not be on State Heritage Register land, among others).
| Cut or fill no more than 600 mm below or above existing ground level | cl 2.30(a) |
| Wall no more than 600 mm high, measured from its base to its top | cl 2.30(f)(i) |
| At least 1 m from each lot boundary | cl 2.30(b) |
| At least 2 m horizontally from any other retaining wall on the site | cl 2.30(f)(ii) |
| At least 1 m from any registered easement, sewer main or water main | cl 2.30(f)(iii) |
| Drainage lines connected to the site's existing stormwater system | cl 2.30(f)(iv) |
| At least 40 m from a natural waterbody | cl 2.30(d) |
| Does not redirect surface or ground water or send sediment onto a neighbour's land | cl 2.30(e) |
| In a heritage conservation area: in the rear yard | cl 2.30(c) |
| Fill deeper than 150 mm covers no more than 25% of the lot | cl 2.30(g) |
| Imported fill is virgin excavated natural material (VENM), free of demolition waste | cl 2.30(h) |
| Rural or conservation zone: no more than 100 m³ of fill per lot | cl 2.30(i) |
Land where it is never exempt
| Not on or in a heritage item or a draft heritage item, on a flood control lot or in an environmentally sensitive area | Codes SEPP cl 2.29 |
If it does not meet the standards
A wall over 600 mm, or one on a flood control lot, needs approval: a complying development certificate (CDC) where a housing code covers the lot and the wall meets its earthworks standards (Housing Code cl 3.30), or otherwise a development application (DA). Walls this size are usually designed by an engineer.
Other projects
Rules current to the version in force from 23 October 2026: State Environmental Planning Policy (Exempt and Complying Development Codes) 2008 and State Environmental Planning Policy (Housing) 2021. Plain-English summaries; the legislation is the authority. The address check uses the NSW zoning, cadastre, heritage, bush fire prone land, acid sulfate soils and flood planning maps we hold, which can lag the council's. It is a guide, not a planning certificate or legal advice. Based on content from the New South Wales Legislation website at 12 November 2026. For the latest information on New South Wales Government legislation please go to https://www.legislation.nsw.gov.au. © State of New South Wales. Licensed under CC BY 4.0: https://creativecommons.org/licenses/by/4.0/
Common questions
Do I need council approval for a retaining wall in NSW?
In NSW a retaining wall needs no council approval if it is exempt development: no higher than 600 mm, cut or fill no more than 600 mm, at least 1 m from every boundary and from any easement, sewer main or water main, at least 2 m from any other retaining wall, at least 40 m from a natural waterbody, and it meets every other standard below. Anything higher needs a complying development certificate or a development application, and usually an engineer's design.
What if it does not meet the standards?
A wall over 600 mm, or one on a flood control lot, needs approval: a complying development certificate (CDC) where a housing code covers the lot and the wall meets its earthworks standards (Housing Code cl 3.30), or otherwise a development application (DA). Walls this size are usually designed by an engineer.
Where do these rules come from?
From the NSW Codes SEPP Part 2, Division 1, Subdivision 15 (clauses 2.29 and 2.30). The rules are statewide, so they are the same in every council area, but the lot's zone, size and planning overlays change which ones apply.