Zoning & yield check
Lot qualification & feasibility
Duplex viability is written into planning instruments, not sales brochures. The zone, the minimum lot size for dual occupancy in that LGA, the frontage width and the mapping overlays jointly decide whether two dwellings are permissible, and whether they can later sit on separate titles.
Scope
What this covers
Zoning and LEP review confirming dual occupancy is permissible on the lot
Measurement of lot area and minimum lot width against the controls that apply
Check of overlays (flood, bushfire, heritage, character) that could alter or block the pathway
An honest early read on attached versus detached configurations for the shape of the block
Yield discussion: keep both, sell one, or hold both as rentals, and what each implies for design
Timing
When it's needed
Run this check before purchase where you are buying for a duplex outcome, and before design where you already own the land. Frontage is the classic trap, plenty of Sydney lots carry the area for dual occupancy but miss the width requirement by less than a metre.
Redevelopment sites are working construction zones: stay outside the fencing, never let children explore cleared lots, and treat any suspected asbestos-containing material in an old dwelling as a matter for licensed assessors rather than a weekend job. Report unsecured fencing or open excavations to the site contact straight away.
Quote variables
What shapes the scope
Which LEP or state code controls apply to the address
Lot geometry: width at the building line matters as much as total area
Slope and drainage direction, which shape earthworks and design cost
Any covenant on title restricting dwelling numbers
Dual occupancy construction is residential building work under NSW law: it requires a contractor licence issued by NSW Fair Trading, written contracts in the prescribed form, and home building compensation cover for contracts above the statutory threshold before any deposit changes hands. Verify licences on the official register, and route subdivision, title and contract questions to registered surveyors and qualified legal advisers.
Duplex services
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