Nearly every first conversation I have with someone about a new build arrives at the same question, usually about ten minutes in. They've got a block, a rough idea, maybe a set of plans from a designer, and what they really want to know is when they can start. I've been pricing and running new dwelling jobs around Sydney and the Illawarra for fifteen years, and my answer has never once been a date. It's a question back: has anyone told you whether this is complying development or a DA?
That single fork decides your timeline, a decent slice of your budget, and how much freedom you have with the design. It's worth understanding properly, because almost every guide on our blog ends up leaning on it and none of them stop to explain it.
There are three levels, not two
Most people arrive thinking the choice is council or no council. It's closer to three tiers.
Exempt development is minor work that needs no approval at all, as long as it stays inside the limits set for it. A small garden shed, some fencing, a low deck. You still have to build it properly and to the standards, you just don't lodge anything.
Complying development is the middle tier, and it's the one worth understanding. It covers a surprising amount of residential work, including plenty of new houses. The rules sit in the State Environmental Planning Policy (Exempt and Complying Development Codes) 2008, which everyone in the industry just calls the Codes SEPP. Inside it there are separate codes for different kinds of work: one for new houses, one for alterations and additions, one for dual occupancies and terraces, and a general one for smaller structures.
A development application is the top tier. Council assesses your proposal on its merits against the local environmental plan and the development control plan, and decides.
What a CDC actually is
A Complying Development Certificate is a combined approval. It rolls the planning consent and the construction approval into one certificate, issued by either your council or a registered private certifier.
The important thing about it is that it isn't a judgement call. It's a checklist. Your block and your design either meet every standard in the relevant code or they don't. Nobody weighs up whether your house is nice, or whether the neighbours would prefer something lower. If you comply, you get the certificate. The statutory clock is short, generally around 20 days from a complete application, and in practice the delay is almost always your own documents rather than the certifier.
The flip side is that there's no negotiating. Miss a standard by a small margin and there's no partial credit and nobody to appeal to. You either change the design to comply or you go to council.
Your neighbours are notified in writing before work starts, but they don't get a say in whether the certificate is issued. That surprises people on both sides of the fence.
What a DA actually is
A DA goes to council, gets assessed on merit, and can be approved, approved with conditions, or refused. It's lodged through the NSW Planning Portal along with your plans and whatever reports your site calls for.
Merit assessment sounds worse than complying development, and for a straightforward house on a straightforward block it usually is: slower, more expensive, less certain. But merit assessment is also the only path where you get to make an argument. If your block has an odd shape, or you want a design that steps outside a numerical control for a good reason, a DA is where you put that case. Councils can and do accept variations to their own standards where the proposal still meets the objective behind the control.
Council also notifies the neighbours and has to consider what they say. That's a real risk on some streets and a non-event on others.
Timeframes vary enormously between councils and between jobs. Weeks for something simple, many months where the site is complicated or the assessment stalls waiting on a referral. Anyone who quotes you a firm DA timeline before they've seen the site is guessing.
What pushes a block off the fast path
This is where most people find out which path they're on, and it usually has nothing to do with the house they want to build. It's the land.
- Heritage. A heritage-listed item, or a block inside a heritage conservation area, generally rules out complying development.
- Environmentally sensitive land, foreshore areas, and various protected zones.
- Flood and bushfire. Some constrained land can still qualify under conditions, some can't. This one genuinely needs checking rather than assuming.
- Lot size, frontage and shape. Undersized blocks, battleaxe lots and skinny frontages fail the code standards more often than anything else. Our guide on narrow block house designs goes into what that does to a design.
- Significant cut and fill. The code caps how much you can carve up a site, which is why steep land so often ends up at council. There's more on that in building on a sloping block.
- The design itself. Setbacks, height, floor area, landscaped area, privacy. Any one of them out of range and you're off the list.
Two blocks on the same street can land on different paths. Don't take your neighbour's approval as evidence about yours.
Where the Construction Certificate fits
More owners come unstuck here than anywhere else in the approval process, and it's the reason "what is a construction certificate" gets typed into Google as often as it does.
If you go the DA route, the consent you get from council is planning approval only. It says you're allowed to build that thing there. It doesn't say your slab, your frame or your waterproofing are up to standard. Before any work starts you need a Construction Certificate, which checks the detailed construction drawings and specifications against the National Construction Code and against the conditions on your consent. Council or a registered certifier can issue it.
So the DA path is two approvals: consent, then CC.
The CDC path is one. A Complying Development Certificate already contains the construction approval, so there's no separate Construction Certificate to chase. That's a real saving in both time and fees, and it's a big part of why the fast path is worth trying for.
Either way, you appoint a Principal Certifier before work starts, they inspect at set stages through the build, and at the end they issue an Occupation Certificate. Nobody moves in before that.
So which one is better?
Neither pathway is better in the abstract. Complying development is better when your block already suits it, and worse when it doesn't.
I've watched people bend a floor plan into an awkward shape purely to squeeze under a code standard, then live in a compromised house to save a few months. I've also watched people default to a DA out of habit when their block would have sailed through a CDC, and lose most of a year for nothing. Both are avoidable with an hour of checking at the start.
The order I'd work in: confirm what your zone permits, check the block against the code standards for the work you're planning, and only then start drawing. Design first and approval second is how people end up paying to redraw.
A private certifier or your council's duty planner can tell you where you stand, and it's the cheapest hour in the whole project. If you're weighing up a contract after that, the NSW building and renovating guidance cover the licensing and insurance side.
How we handle it
We sort the approval pathway as part of the job rather than handing you a set of plans and wishing you luck. That means checking the block against the code early, telling you straight if a CDC is realistic, and running the design toward whichever path gives you the better house rather than the faster certificate. For granny flats specifically, most blocks do qualify for the fast path, and do you need council approval for a granny flat in NSW covers that in detail.
If you've got a block and you're not sure which path it's on, see how we work on new homes, then call us on 0434 037 851 or get in touch through the contact page. We'll look at the land, the controls and the idea together, and tell you what's realistic before you spend money on drawings.
Want a hand with this at your place? Get a free quote or call 0434 037 851.