May 20, 2025
Basement Drainage and Pump-Out Systems Sydney Councils Accept
How basement drainage and pump-out systems are designed to satisfy Sydney councils - gravity first, dual pumps, storage, alarms and the approvals…
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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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May 6, 2025
Greenfield vs Infill Development in Sydney: Engineering Costs
Comparing greenfield and infill development in Sydney? A civil engineer breaks down the real cost drivers: earthworks, stormwater, services and approvals.
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April 15, 2025
Which Surveys Does Your Development Need? A NSW Builder’s Guide
Detail, identification, level, set-out and WAE surveys explained - what each one is for, when your NSW project needs it, and what…
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April 8, 2025
Blue Mountains Council Stormwater & Drainage Requirements
Blue Mountains DCP 2015 stormwater and WSUD requirements for builders - ridge-top development, World Heritage catchments and sensitive discharge design.
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March 25, 2025
Granny Flat Stormwater & Site Rules Across NSW Councils
How stormwater disposal, OSD and site rules affect granny flat approvals across NSW councils, and how to avoid the traps on downstream…
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March 18, 2025
WAE Surveys & OSD Certification: Get Your OC Without Delays
What a works-as-executed survey must show, how OSD certification works, and how builders avoid the as-built failures that stall occupation certificates.
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March 11, 2025
Cumberland Council Stormwater & OSD Rules for Duplex Builds
Cumberland DCP 2021 stormwater and OSD requirements - a practical guide for duplex and townhouse builders in Merrylands, Granville and Guildford.
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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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February 18, 2025
Driveway Design and Drainage: NSW Gradient and Crossover Rules
Driveway gradients, transitions, scraping checks and council crossover approvals in NSW - how to design access that cars can use and councils…
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