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Guide

Battle-Axe Block Duplexes in NSW: Why CDC Is Difficult

Battle-axe blocks, the hatchet-shaped lots with a long access handle to a rear allotment, are a classic 'tricky site'. The Low Rise Housing Diversity Code excludes them from CDC, so a dual occupancy here almost always means a DA. Here's how to approach it.

Last updated: 20 June 2026

Why CDC is off the table

The Low Rise Housing Diversity Code specifically excludes battle-axe (hatchet-shaped) lots from complying development for dual occupancy. That means the fast-track isn't available, and a considered DA is the realistic path.

The design challenges of a handle lot

  • Access handle width for driveways, services, waste and emergency access.
  • Privacy and overlooking between the rear dwelling and surrounding backyards.
  • Solar access and private open space on a landlocked rear parcel.
  • Stormwater and services routed along a long, narrow handle.

How a DA-led design succeeds

A well-resolved DA addresses access, privacy and amenity head-on, with a design that sits quietly behind the street rather than dominating it. Battle-axe sites reward exactly the difficult-site experience we specialise in.

Frequently asked questions

Not for a dual occupancy under the Low Rise Housing Diversity Code, battle-axe lots are excluded. A DA is the path, and it's very achievable with the right design.

Authoritative sources: NSW Low Rise Housing Diversity Code, NSW Planning Portal.

Reviewed by Mounzer Mortada

Registered Architect (NSW 10697)

Registered Architect and Licensed Builder with 20+ years across 3000+ projects. Read more about NSW Terraces and Duplex.

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