Suburb guide · 2219
Can I build a duplex or granny flat in Sans Souci?
Sans Souci sits in Bayside Council's area under Bayside Local Environmental Plan 2021. We ran 25 real Sans Souci addresses through the checker: the typical block is 513 m² with 13.5 m of frontage, 17 of the 25 could add a granny flat, and 13 could carry two separate homes today.
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The typical Sans Souci block
The middle block of the 25 we checked is 513 m² with 13.5 m of street frontage. The smallest was 185 m² and the largest 1,038 m². Zones in the sample: R2 (20), SP2 (2), MU1 (1), R3 (1), R4 (1).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2219
Median sale prices for the whole of postcode 2219, January to March 2026. These cover every suburb sharing the postcode, not Sans Souci alone, and they are not a value for any one block.
- Houses: $2.11m (11 to 30 sales, a small sample)
- Units and apartments: $1.07m (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
17 of the 25 blocks we checked could take one. Bayside 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 Sans Souci
13 of the 25 blocks we checked could carry two or more separate homes today.
Bayside LEP sets no minimum lot size or frontage for a dual occupancy — permitted with consent in R2 and judged on Council's DCP; a split into two titles needs 350 m² per lot with one home on each (cl 4.1(3B)), the access handle of a battle-axe not counted
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 Sans Souci 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
1 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 Sans Souci 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 Sans Souci. 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.