Complying Development for Dual Occupancies
Dual occupancies - two dwellings on one lot, attached or detached - were traditionally assessed as a Development Application in most council areas. Statewide housing reforms have since opened a complying development pathway for dual occupancies in more residential zones than before, subject to satisfying the Codes SEPP criteria in full. Whether your lot qualifies depends on the zone, minimum lot size and frontage, and whether any overlay applies - we check this before you commit to a design or a purchase.
Free consultation
- 3–4 weeks where CDC eligible · DA typically 8–14 weeks where it is not
- From $3,200 + GST for a CDC package
- Quoted fixed after a free scope check
Why this changed
Dual occupancy has historically needed a merit-assessed DA in most council areas, with permissibility and lot size varying widely between local environmental plans. Statewide housing reforms have progressively standardised where dual occupancies are permitted and, in many R1, R2 and R3 zones, made complying development available where it previously was not. The practical effect is that more sites now qualify for the faster pathway than a few years ago - but "more" is not "all."
What we check before any design is commissioned
Whether the zone permits dual occupancy at all, and whether it is captured by the complying development provisions or requires a DA in your council area. Minimum lot size and frontage for the CDC pathway specifically, which can differ from the minimum for a DA. Any heritage, bushfire, flood or foreshore overlay, each of which commonly excludes the site from complying development even where the underlying zone permits the use.
Feasibility first, always
Two compliant dwellings need enough site area for setbacks, private open space and landscaped area to work for both - not just enough area on paper. We test this before you engage a designer, because a yield that looks achievable on a zoning map can fail once real setbacks are applied.
How it works
Zone and lot check
24–48 hours
Whether dual occupancy is permitted at all in your zone, and whether your lot meets the minimum size and frontage for the complying development pathway.
Design criteria assessment
3–5 days
Height, setbacks, floor space ratio, landscaped area, private open space and separation between the two dwellings.
Package preparation
2–3 weeks
Drawings, BASIX certificates for both dwellings, survey and supporting documentation.
Certification or lodgement
CDC 3–4 weeks · DA 8–14 weeks
Certified as CDC where eligible, or lodged as a DA where a variation is needed.
What we take off your hands
What EHUP handles
- Confirming whether your zone and lot currently permit a dual occupancy as complying development
- Minimum lot size, frontage and subdivision-potential checks before you commission a design
- A full design criteria check - setbacks, height, floor space ratio, private open space, landscaped area
- Preparing the CDC package to certifier standard
- Advising honestly when a DA is the only available pathway
What you don't have to deal with
- Buying a lot on the assumption a dual occupancy is achievable
- Designing to a yield the current controls do not support
Frequently asked questions
Can every dual occupancy now be approved as complying development?
No. The reforms expanded where dual occupancies are a permitted form of development and, in many zones, opened a complying development pathway, but the Codes SEPP design criteria still have to be met in full - minimum lot size and frontage, setbacks, height and site coverage among them. A lot that is permitted in principle can still fail on dimensions.
Is subdivision of a dual occupancy automatic?
No - Torrens title subdivision into two separate lots is a distinct approval from the development consent or CDC for the dwellings themselves, and it is assessed against separate minimum lot size and access requirements. Some dual occupancies are approved without ever being subdivided and remain in one ownership.
What is the difference between attached and detached dual occupancy?
An attached dual occupancy shares a common wall; a detached dual occupancy has two separate buildings on the one lot. Councils sometimes treat the two differently for setback and site coverage purposes, and detached forms generally need more site area to satisfy separation and private open space criteria for both dwellings.
My lot is heritage-listed or bushfire-prone - does that rule it out?
It generally takes the complying development pathway off the table, because those constraints sit outside the criteria a certifier can certify against. A DA remains available and is assessed on its merits, including any heritage or bushfire referral the site requires.
Related services
Complying Development (CDC)
A Complying Development Certificate is the fast-track approval pathway.
Low & Medium Density (LMR)
Low and medium density residential development - dual occupancies, manor houses, terraces, townhouses and multi-dwelling housing - sits in the most contested part of the NSW planning framework.
CDC - House & Granny Flat
A new single dwelling house on a standard lot, or a secondary dwelling - a granny flat - can frequently be approved as complying development rather than through a full Development Application, provided the lot and the design satisfy every criterion in the Codes SEPP in full: minimum lot size, maximum floor area, height, setbacks and landscaped area among them.
Why clients choose EHUP
- 10+
- 250+
- 14
- 1
Not sure which approval you need?
Tell us the address and what you want to do. We'll help identify the appropriate planning pathway, whether it is exempt development, complying development or a full DA. Your first conversation is free.