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Difficult Duplex Sites Sydney, Architecture That Works Around Planning Constraints

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The constraint-by-constraint playbook

For each common issue: what it is, what we check, the possible design response, and when a consultant is needed. The Low Rise Housing Diversity Code excludes battle-axe lots and heritage from CDC, so those usually route to a DA.

Difficult-site case studies

Real Sydney projects, told as Issue → Strategy → Outcome. The render is the outcome; the story is how we got a workable, approvable design onto a constrained block.

Caringbah South · Sutherland Shire

Caringbah South dual occupancy on a constrained corner

Corner exposure & streetscape controls, DA · Side-by-side, two-storey

Blakehurst · Georges River

Blakehurst duplex balancing privacy and outlook

Overlooking & privacy controls, DA · Side-by-side, two-storey

Roselands · Canterbury-Bankstown

Roselands dual occupancy on a standard suburban lot

Setbacks, FSR & solar access, DA · Side-by-side, two-storey

Narwee · Georges River

Narwee dual occupancy designed for the streetscape

Streetscape & neighbour character, DA · Side-by-side, two-storey

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The constraint-by-constraint playbook

Narrow frontageUnder ~12m, a standard side-by-side duplex struggles to fit two dwellings, parking and setbacks.

Sloping landFall across the site complicates floor levels, parking, excavation and privacy.

Battle-axe & accessHatchet-shaped lots are excluded from CDC and raise access, privacy and amenity issues.

EasementsSewer, drainage or right-of-way easements can restrict where you build.

HeritageA heritage item or conservation area removes CDC and demands a context-sensitive design.

Flood-prone landFlood mapping sets minimum floor levels and stormwater requirements.

Bushfire (BAL)Bushfire-prone land triggers a BAL assessment, construction standards and setbacks.

Significant treesProtected trees can dictate where a duplex can sit and reduce buildable area.

Privacy & overshadowingOverlooking neighbours and casting shadow are common objection and refusal triggers.

StormwaterGetting water off the site legally can be difficult on flat or landlocked lots.