December 16, 2025
Dual Occupancy Stormwater: Duplex Design in Western Sydney
What a duplex stormwater package really involves in Western Sydney — OSD, easements, clay soils, subdivision traps and what certifiers check at…
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Updates from Contrive Consultants.
May 13, 2025
Proprietary Device vs Bioretention for Duplex & Townhouse Sites
Cartridge device or rain garden? Cost, footprint, maintenance and MUSIC modelling compared for NSW duplex and townhouse stormwater treatment.
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March 4, 2025
NSW Low and Mid-Rise Reforms: Dual Occs and Terraces Expand
Stage 2 of the NSW low and mid-rise housing reforms commenced 28 February 2025. What the dual occupancy and terrace standards mean…
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May 28, 2024
Telecoms Design for Multi-Dwelling Projects: Duplex to Townhouse
How telecommunications infrastructure design works for duplexes, dual occupancies and townhouse projects in NSW — lead-ins, conduits and the NBN process.
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April 9, 2024
Torrens vs Strata Subdivision for Duplexes in NSW: Which Is Best?
Torrens or strata title for your NSW duplex? Compare the process, cost drivers, buyer appeal and site requirements before you commit to…
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January 16, 2024
The Duplex Development Process in Sydney: A Step-by-Step Guide
Every stage of a Sydney duplex project explained — feasibility, design, approvals, construction and subdivision, plus the consultants you need at each…
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January 17, 2023
When Do You Need OSD in Sydney? Triggers by Development Type
New dwelling, duplex, granny flat or commercial build — when do Sydney councils require on-site detention? The common triggers explained.
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December 6, 2022
Duplex Stormwater & Roof Drainage Plans in Sydney: Dual Occupancy
Dual occupancy stormwater requirements explained — shared drainage, easements, detention and roof drainage plans certifiers expect for Sydney duplexes.
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