Suburb guide · 2570
Can I build a duplex or granny flat in Brownlow Hill?
Most of Brownlow Hill is land this tool does not answer for. 19 of the 25 blocks we checked sit in rural, conservation, industrial or special-purpose zones rather than a residential one, and Block Checker covers residential zones only. The counts below are what it could assess — they are not a finding that nothing can be built. For land like this, a planner reads the LEP for the zone directly.
Brownlow Hill sits in Wollondilly Shire Council's area under Wollondilly Local Environmental Plan 2011. We ran 25 real Brownlow Hill addresses through the checker: the typical block is 44,448 m² with 132.4 m of frontage. Most of them are not residential land, so see the note below before reading the counts.
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The typical Brownlow Hill block
The middle block of the 25 we checked is 44,448 m² with 132.4 m of street frontage. The smallest was 209 m² and the largest 3,713,180 m². Zones in the sample: RU2 (11), C4 (6), RU1 (4), SP1 (3), RU4 (1).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2570
Median sale prices for the whole of postcode 2570, January to March 2026. These cover every suburb sharing the postcode, not Brownlow Hill alone, and they are not a value for any one block.
- Houses: $1.23m (198 sales)
- Units and apartments: $770k (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
6 of the 25 blocks we checked could take one. Wollondilly LEP cl 5.4(9) — the greater of 60 m² or 25% 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 Brownlow Hill
0 of the 25 blocks we checked could carry two or more separate homes today.
Under Wollondilly Local Environmental Plan 2011 a dual occupancy needs 800 m² — this LEP sets no frontage minimum, so Council's DCP governs width.
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 Brownlow Hill 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
24 of 25 were on bushfire-prone land; 3 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 Brownlow Hill 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 Brownlow Hill. 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.