Duffys Forest is a small locality of about 500 people in NSW’s Northern Beaches, made up almost entirely of houses. With a median weekly rent of $625 and family-sized households averaging 3.2 people, this page brings together verified ABS Census measures to help you gauge the local market and where Duffys Forest blocks may hold value. Then audit a specific block to see its exact value and development potential.
Source: ABS Census 2021 · Reference: August 2021 · Suburb-level
We don't publish current Duffys Forest sale prices yet. Individual sale records are not published here. Figures shown are suburb-level medians from ABS/Census sources — audit an exact address for property-specific analysis. The figures above are ABS Census measures; for a current, address-specific estimate and value-add scenarios, audit the exact property.
Source: OpenStreetMap · as of August 2026 · indicative, counted within the suburb boundary
General value-add directions — none of these imply approval for any specific site. Exact feasibility depends on the block and its planning controls.
Refresh kitchens, bathrooms and finishes to lift value without structural change.
Audit your addressAdd living space upward where the existing dwelling and site allow.
Audit your addressTwo dwellings on one lot can be viable on suitable blocks under the right controls.
Audit your addressLarger or wider lots may support subdivision, subject to minimum-lot rules.
Audit your addressReplacing an older dwelling can unlock a site’s full potential.
Audit your addressDuffys Forest is made up of a mix of planning zones (below); residential development potential depends on the exact site.
Planning instrument: Warringah Local Environmental Plan 2011.
NSW's low- and mid-rise housing reforms are progressively lifting what's permissible near centres and transport across the state, so a Duffys Forest site's potential today can differ from its history. Exact controls — zone, height, floor-space ratio, minimum lot size, heritage and any coastal or environmental overlays — vary by address, planning instrument, site and proposal. Confirm them for a specific site.
Zoning source: NSW ePlanning (EPI Primary Planning Layers) · as of August 2026. General and qualified — verify controls for any specific address.
It depends on the specific lot. dual occupancy is only permissible on suitable sites that meet the zone, minimum lot size and other controls in the local plan. Audit an exact Duffys Forest address to see whether a duplex is feasible there.
A secondary dwelling (granny flat) is often possible on suitably sized residential lots under NSW housing rules, but it depends on lot size, setbacks and the site. Audit your Duffys Forest address to check feasibility.
Subdivision hinges on the zone and the minimum lot size that applies to your block — larger or wider lots have more potential. Audit an exact address to see whether subdivision is on the table.
We don't publish current sale prices on this page yet — the figures shown are measured ABS Census medians, not live sale data. For a current, address-specific value estimate, run a free Upblock audit.
Population, dwelling and median figures are from the ABS 2021 Census; amenity counts from OpenStreetMap; zoning from the NSW ePlanning planning layers. Each is labelled with its source.
Public suburb pages never expose an individual owner's identity, contact details or selling intent. Address-specific analysis runs inside Upblock's private audit flow.
Enter your address to see what yours could become.
Disclaimer: Upblock provides indicative property insights for research purposes only. All information should be verified independently with qualified professionals. This is not financial, legal, or professional advice. Estimates and scenarios are indicative only and do not constitute property valuations.
