Suburb guide · 2570
Can I build a duplex or granny flat in Cobbitty?
Cobbitty sits in Camden Council's area under Camden Local Environmental Plan 2010. We ran 25 real Cobbitty addresses through the checker: the typical block is 888 m² with 20.1 m of frontage, 12 of the 25 could add a granny flat, and 0 could carry two separate homes today.
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The typical Cobbitty block
The middle block of the 25 we checked is 888 m² with 20.1 m of street frontage. The smallest was 310 m² and the largest 103,724 m². Zones in the sample: R1 (11), R5 (6), C4 (4), RU1 (4).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2570
Median sale prices for the whole of postcode 2570, January to March 2026. These cover every suburb sharing the postcode, not Cobbitty alone, and they are not a value for any one block.
- Houses: $1.23m (198 sales)
- Units and apartments: $770k (11 to 30 sales, a small sample)
Source: NSW Government Rent and Sales Report (Department of Communities and Justice), sales tables by postcode, NSW Government. Updated each quarter.
A granny flat
12 of the 25 blocks we checked could take one. Camden LEP cl 5.4(9) — the greater of 60 m² or 25% of the house’s total floor area, parking excluded. Separately, the state Housing SEPP allows a granny flat of up to 60 m² through the ten-day complying-development route on a lot of 450 m² or more with a 12 m frontage, where the land is not flood, bushfire or heritage constrained.
Dual occupancy (duplex) rules in Cobbitty
0 of the 25 blocks we checked could carry two or more separate homes today.
Under Camden Local Environmental Plan 2010 a dual occupancy needs 600 m² and 18 m of frontage.
Low and Mid-Rise
None of the 25 blocks we checked fell inside the state Low and Mid-Rise area, so in this part of Cobbitty the LEP minimums are what count. The boundary is a walking distance from a listed centre, so it can cut through a suburb — the checker reads which side of it your own address sits on.
What else turned up
11 of 25 were on bushfire-prone land. Any of those takes a block out of the fast-track routes and into a full DA, so it changes the answer more than the lot size does.
How we got these numbers
We took 25 real Cobbitty street addresses from the NSW geocoder and ran every one through the same engine this site runs for you, reading the planning controls live. Nothing here is modelled or estimated.
It is a sample, not a census. The addresses are a spread across what the geocoder returns, so treat these as "of the 25 blocks we checked" rather than a figure for every block in Cobbitty. Your own block is the only one that answers for itself — that is what the box on the right is for.
Enter the address — lot, frontage, zone, constraints and what it can carry.