Suburb guide · 2761
Can I build a duplex or granny flat in Colebee?
Colebee sits in Blacktown City Council's area under Blacktown Local Environmental Plan 2015. We ran 25 real Colebee addresses through the checker: the typical block is 467 m² with 14.8 m of frontage, 11 of the 25 could add a granny flat, and 10 could carry two separate homes today.
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The typical Colebee block
The middle block of the 25 we checked is 467 m² with 14.8 m of street frontage. The smallest was 375 m² and the largest 873 m². Zones in the sample: R3 (25).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2761
Median sale prices for the whole of postcode 2761, January to March 2026. These cover every suburb sharing the postcode, not Colebee alone, and they are not a value for any one block.
- Houses: $1.14m (68 sales)
- Units and apartments: not published (10 or fewer sales this quarter)
Source: NSW Government Rent and Sales Report (Department of Communities and Justice), sales tables by postcode, NSW Government. Updated each quarter.
A granny flat
11 of the 25 blocks we checked could take one. Blacktown LEP cl 5.4(9) — the greater of 60 m² or 5% 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 Colebee
10 of the 25 blocks we checked could carry two or more separate homes today.
Under Blacktown Local Environmental Plan 2015 a dual occupancy needs 500 m² — this LEP sets no frontage minimum, so Council's DCP governs width.
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 Colebee 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
4 of 25 were on bushfire-prone land; 2 of 25 were flood-mapped; 2 of 25 carried a heritage listing or conservation area. 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 Colebee 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 Colebee. 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.