On the fast approval pathway, a Sydney granny flat typically runs about 6 to 9 months from first enquiry to handover. Roughly 2 months of that is design and documentation, 1 to 2 months is approval, and 3 to 4 months is construction. On the council approval pathway, add 3 to 6 months.
The part people underestimate is not construction. It is everything that has to happen before construction can start.
BlueGum’s published figures are 4 to 6 weeks for CDC approval and 12 to 16 weeks for construction.
Add it up on the fast pathway and you get roughly 6 to 9 months. On the council pathway, roughly 9 months to a year.
You cannot lodge an approval application until the survey, soil test, engineering drawings and BASIX certificate are done. Those are separate professionals with their own schedules.
This stage is where most of the avoidable delay lives. It is also almost entirely front-loaded, which means the sooner it starts, the sooner everything else can follow.
On the complying development pathway, a certifier is checking your plans against a fixed list. There is no discretion, so once the documents are complete and compliant, it moves.
You will see this quoted as 10 to 20 business days. That figure comes from certifier practice rather than legislation, and it assumes a complete application. If something is missing, the clock effectively restarts when you supply it.
On the development application pathway, council is assessing on merit. That involves notification periods, internal referrals, and often requests for further information. Three to 6 months is normal, and it can run longer on a complex site.
Twelve to sixteen weeks is a realistic range for a straightforward granny flat.
The pattern is worth noticing. Most of the preventable delays happen before a single trade turns up, and most of them come down to how thoroughly the early work was done.
Construction alone can be 12 to sixteen weeks, so roughly 3 to 4 months. But that is measured from slab to handover, not from your first phone call. Design, documentation and approval come first, and they typically add 3 to 5 months on the fast pathway.
On the complying development pathway it is construction. On the development application pathway it is council approval, which can take 3 to 6 months on its own.
Wet weather affects the early stages most, particularly excavation and the slab pour, because those need reasonably dry conditions. Once the roof is on, weather matters much less.
Yes, in almost all cases. There will be noise, trades and machinery, and access to part of your yard will be restricted, but the main house stays liveable.
Final inspections are completed, an occupation certificate is issued, and you get the keys. Ask your builder what warranty period applies and how defects are handled after handover, because that varies.
Building granny flats since
Since 2012
Builder licence
247388C, verifiable through NSW Fair Trading
Industry body
Housing Industry Association member
MBA NSW Excellence in Housing Awards
Winner 2021, Winner 2023, Finalist 2020
Completed granny flats documented on this site
70+
Approvals
CDC and DA, both managed in-house
Pricing
Fixed price after a site assessment, 2-bedroom from $134,990
Building granny flats since
Since 2012
Builder licence
247388C, verifiable through NSW Fair Trading
Industry body
Housing Industry Association member
MBA NSW Excellence in Housing Awards
Winner 2021, Winner 2023, Finalist 2020
Completed granny flats documented on this site
70+
Approvals
CDC and DA, both managed in-house
Pricing
Fixed price after a site assessment, 2-bedroom from $134,990
