Suburb guide · 2322
Can I build a duplex or granny flat in Lenaghan?
Lenaghan sits in City of Newcastle's area under Newcastle Local Environmental Plan 2012. We ran 21 real Lenaghan addresses through the checker: the typical block is 79,741 m² with 177.2 m of frontage, 12 of the 21 could add a granny flat, and 0 could carry two separate homes today.
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The typical Lenaghan block
The middle block of the 21 we checked is 79,741 m² with 177.2 m of street frontage. The smallest was 8,240 m² and the largest 380,037 m². Zones in the sample: C4 (12), C2 (9).
The 21 blocks we checked, by land size.
What homes sell for in postcode 2322
Median sale prices for the whole of postcode 2322, January to March 2026. These cover every suburb sharing the postcode, not Lenaghan alone, and they are not a value for any one block.
- Houses: $857k (103 sales)
- Units and apartments: $755k (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 21 blocks we checked could take one. Newcastle LEP cl 5.4(9) — the greater of 60 m² or 20% 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 Lenaghan
0 of the 21 blocks we checked could carry two or more separate homes today.
Newcastle LEP sets no minimum lot size or frontage for a dual occupancy — R2 permits ‘residential accommodation’ as a group term, so it is judged on Council's DCP; a split needs 200 m² per lot for a house or semi (cl 4.1A), otherwise the Lot Size Map
Low and Mid-Rise
None of the 21 blocks we checked fell inside the state Low and Mid-Rise area, so in this part of Lenaghan 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
21 of 21 were on bushfire-prone land; 6 of 21 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 21 real Lenaghan 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 21 blocks we checked" rather than a figure for every block in Lenaghan. 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.