Can I build a duplex or granny flat in Five Dock?

The typical Five Dock block

The middle block of the 25 we checked is 401 m² with 12.7 m of street frontage. The smallest was 289 m² and the largest 887 m². Zones in the sample: R2 (22), R3 (2), E3 (1).

What homes sell for in postcode 2046

Median sale prices for the whole of postcode 2046, January to March 2026. These cover every suburb sharing the postcode, not Five Dock alone, and they are not a value for any one block.

• Houses: $3.36m (11 to 30 sales, a small sample)
• Units and apartments: $1.17m (62 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

8 of the 25 blocks we checked could take one. Canada Bay LEP cl 5.4(9) — the greater of 60 m² or 43% 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 Five Dock

9 of the 25 blocks we checked could carry two or more separate homes today.

Under Canada Bay Local Environmental Plan 2013 a dual occupancy needs 450 m² and 14 m of frontage.

Only 3 of the 25 blocks we checked were ordinary R2 land outside the Low and Mid-Rise area, which is too few to read anything into — most of Five Dock in our sample was zoned or mapped some other way.

Low and Mid-Rise

22 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 Five Dock 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 Five Dock. Your own block is the only one that answers for itself — that is what the box on the right is for.