Suburb guide · 2135
Can I build a duplex or granny flat in Strathfield?
Strathfield sits in Strathfield Council's area under Strathfield Local Environmental Plan 2012. We ran 25 real Strathfield addresses through the checker: the typical block is 681 m² with 15.8 m of frontage, 21 of the 25 could add a granny flat, and 2 could carry two separate homes today.
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The typical Strathfield block
The middle block of the 25 we checked is 681 m² with 15.8 m of street frontage. The smallest was 400 m² and the largest 1,265 m². Zones in the sample: R2 (23), R3 (1), R1 (1).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2135
Median sale prices for the whole of postcode 2135, January to March 2026. These cover every suburb sharing the postcode, not Strathfield alone, and they are not a value for any one block.
- Houses: $3.86m (11 to 30 sales, a small sample)
- Units and apartments: $780k (54 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
21 of the 25 blocks we checked could take one. Strathfield 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 Strathfield
2 of the 25 blocks we checked could carry two or more separate homes today.
dual occupancies are not in the R2 land-use table of the Strathfield LEP, so outside the state Low and Mid-Rise catchment they are not permitted; inside it, cl 4.1B (inserted 2025) sets 560 m² (800 m² on land in ‘Area A’ on the Lot Size for Dual Occupancy Development Area Map) — a planner confirms how the state rule and the LEP figure interact on your lot
Low and Mid-Rise
2 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
2 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 Strathfield 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 Strathfield. 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.