Do I Need a DA to Build a Fence or Retaining Wall?

If you’re planning to build a fence or retaining wall in NSW, you might be wondering whether you need a development application (DA).

The answer depends on a few factors, including the height, location, and type of structure. As a town planner in NSW, I often help clients navigate this grey area. Here’s what you need to know to avoid delays or costly mistakes.

Fence or Wall: What Triggers a DA Approval?

Not every fence or retaining wall requires formal DA approval. In many cases, small-scale works are considered exempt development under the NSW planning framework.

For example, if you are building a rear or side boundary fence under 1.8 metres in height using standard materials, you may not need to lodge a development application.

However, if the fence is on a corner block, near a road, within a flood-prone area or heritage-listed site, it likely falls outside exempt rules. The same goes for retaining walls over one metre high or close to neighbouring boundaries.

In these situations, consulting a town planning consultant is essential to determine whether you’ll need a planning permit in NSW.

Real-World Scenarios: When Clients Get Caught Out

A recent client in Marrickville installed a brick front fence over two metres high without checking building regulations NSW.

It blocked sightlines at a driveway and triggered a compliance notice. We had to prepare a statement of environmental effects for NSW DA, liaise with council, and support a Clause 4.6 variation request NSW to justify the breach.

Another homeowner in Camden wanted to build a tiered retaining wall on a sloping site.

Because it affected stormwater flow and boundary conditions, we handled the full council submission for secondary dwelling NSW and secured the necessary permits with tailored planning advice.

Heritage, Flood Zones and Zoning Considerations

If your property is in a heritage conservation area, even a basic timber fence might require approval. A heritage impact statement NSW town planning may be required to assess visual and structural impact.

Likewise, if you live in bushfire-prone or flood-affected areas, fence or wall works may need to be reviewed as part of broader DA approval conditions.

In these cases, you’ll need help from a town planner near me specialising in NSW DCP and familiar with zoning overlays.

When to Engage a Planning Consultant

The key is not guessing. Councils apply NSW planning rules based on location, land use and zoning.

A qualified NSW town planning consultant for subdivision approval can confirm whether your fence or wall falls under exempt development or if you’ll need formal planning advice for dual occupancy NSW or otherwise.

Our firm offers town planning services for residential development NSW and commercial projects.

Whether it’s a backyard retaining wall or a commercial change of use, our team can prepare your statement of environmental effects, manage council approval, and support you through the full DA process.