Suburb guide · 2029
Can I build a duplex or granny flat in Rose Bay?
Rose Bay sits in Waverley Council's area under Waverley Local Environmental Plan 2012. We ran 25 real Rose Bay addresses through the checker: the typical block is 508 m² with 12.1 m of frontage, 12 of the 25 could add a granny flat, and 20 could carry two separate homes today.
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The typical Rose Bay block
The middle block of the 25 we checked is 508 m² with 12.1 m of street frontage. The smallest was 180 m² and the largest 703 m². Zones in the sample: R2 (14), R3 (8), E1 (3).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2029
Median sale prices for the whole of postcode 2029, January to March 2026. These cover every suburb sharing the postcode, not Rose Bay alone, and they are not a value for any one block.
- Houses: not published (10 or fewer sales this quarter)
- Units and apartments: $1.60m (31 sales)
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. Waverley LEP cl 5.4(9) — the greater of 60 m² or 30% 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 Rose Bay
20 of the 25 blocks we checked could carry two or more separate homes today.
Waverley LEP sets no minimum lot size or frontage for a dual occupancy — permitted with consent in R2 and judged on Council's DCP and the sliding floor-space ratio in cl 4.4A
Low and Mid-Rise
11 of the 25 blocks sat inside the state Low and Mid-Rise area — within about an 800 m walk of a listed centre or station. Inside it the Housing SEPP overrides the LEP minimums: a dual occupancy on 450 m² with a 12 m frontage, terraces on 500 m² / 18 m, townhouses on 600 m² / 12 m and a manor house on 500 m² / 12 m, up to 9.5 m. That is what lifts the two-homes figure above; a block one street outside the line gets the LEP figure instead.
What else turned up
None of the blocks we checked came back bushfire-prone, flood-mapped or heritage-listed. 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 Rose Bay 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 Rose Bay. 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.