Suburb guide · 2250
Can I build a duplex or granny flat in Somersby?
Most of Somersby is land this tool does not answer for. 25 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.
Somersby sits in Central Coast Council's area under Central Coast Local Environmental Plan 2022. We ran 25 real Somersby addresses through the checker: the typical block is 20,052 m² with 139.1 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 Somersby block
The middle block of the 25 we checked is 20,052 m² with 139.1 m of street frontage. The smallest was 72 m² and the largest 1,282,487 m². Zones in the sample: E4 (8), RU1 (8), RU2 (5), SP2 (2), C3 (1), C2 (1).
The 25 blocks we checked, by land size.
What homes sell for in postcode 2250
Median sale prices for the whole of postcode 2250, January to March 2026. These cover every suburb sharing the postcode, not Somersby alone, and they are not a value for any one block.
- Houses: $1.12m (195 sales)
- Units and apartments: $710k (173 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
0 of the 25 blocks we checked could take one. Central Coast LEP cl 5.4(9) — the greater of 60 m² or 30% 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 Somersby
0 of the 25 blocks we checked could carry two or more separate homes today.
Under Central Coast Local Environmental Plan 2022 a dual occupancy needs 550 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 Somersby 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
25 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 Somersby 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 Somersby. 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.