Suburb guide · 2225
Can I build a duplex or granny flat in Oyster Bay?
Oyster Bay sits in Sutherland Shire Council's area under Sutherland Shire Local Environmental Plan 2015. We ran 25 real Oyster Bay addresses through the checker: the typical block is 693 m² with 14.5 m of frontage, 15 of the 25 could add a granny flat, and 7 could carry two separate homes today.
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The typical Oyster Bay block
The middle block of the 25 we checked is 693 m² with 14.5 m of street frontage. The smallest was 525 m² and the largest 1,711 m². Zones in the sample: R2 (14), C3 (10), C4 (1).
The 25 blocks we checked, by land size.
A granny flat
15 of the 25 blocks we checked could take one. Sutherland Shire 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 Oyster Bay
7 of the 25 blocks we checked could carry two or more separate homes today.
Under Sutherland Shire Local Environmental Plan 2015 a dual occupancy needs 600 m² — this LEP sets no frontage minimum, so Council's DCP governs width.
Of the 14 ordinary R2 blocks in our sample sitting outside the Low and Mid-Rise area, 7 had the 600 m². There is no LEP frontage test to pass here, but Council's DCP still judges width, setbacks and private open space, so clearing the area alone does not settle it.
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 Oyster Bay 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
2 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 Oyster 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 Oyster 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.