Suburb guide · 2153
Can I build a duplex or granny flat in Bella Vista?
Bella Vista sits in The Hills Shire Council's area under The Hills Local Environmental Plan 2019. We ran 25 real Bella Vista addresses through the checker: the typical block is 699 m² with 18.8 m of frontage, 17 of the 25 could add a granny flat, and 22 could carry two separate homes today.
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The typical Bella Vista block
The middle block of the 25 we checked is 699 m² with 18.8 m of street frontage. The smallest was 287 m² and the largest 890 m². Zones in the sample: R2 (21), R3 (4).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2153
Median sale prices for the whole of postcode 2153, January to March 2026. These cover every suburb sharing the postcode, not Bella Vista alone, and they are not a value for any one block.
- Houses: $1.95m (109 sales)
- Units and apartments: $955k (86 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
17 of the 25 blocks we checked could take one. The Hills 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 Bella Vista
22 of the 25 blocks we checked could carry two or more separate homes today.
Under The Hills Local Environmental Plan 2019 a dual occupancy needs 600 m² — this LEP sets no frontage minimum, so Council's DCP governs width.
Of the 18 ordinary R2 blocks in our sample sitting outside the Low and Mid-Rise area, 16 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
5 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 Bella Vista 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 Bella Vista. 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.