Bad drainage is the number one reason councils knock back residential plans. We design stormwater systems that meet your council's specific requirements — for new builds, granny flats, duplexes and major renovations.
Fixed-fee quote within 3 business days. Designed by in-house hydraulic engineers.
Council-compliant drainage that won't get your project red-flagged.
Whether you're a homeowner, builder or developer, the stormwater design either passes council or it doesn't. We design to your specific council's policy from day one — so the rest of your project doesn't get held up waiting on drainage redraws.
"I'd been burned by a previous architect on a duplex DA that got knocked back twice. Nemco redrew it, talked us through what council actually wanted, and got it through first try. Fixed fee, no surprises."
Most rejected DAs aren't rejected because of the building. They're rejected because the stormwater design doesn't meet council's drainage policy — and every council writes their own policy. Fix this at the design stage and your approval is dramatically faster.
A full hydraulic scope handled in-house, coordinated with the architectural and structural drawings from day one.
OSD thresholds, rainfall intensities and discharge points vary across Canterbury-Bankstown, Inner West, Sutherland Shire, Parramatta, Liverpool, Fairfield and the rest of Sydney metro. We design to the actual council policy — not a generic template — and we keep an internal reference for every council we regularly work in.
Custom Home 
Duplex 
Custom Home Send us the site, the council, and what's planned. We'll come back with a fixed-fee quote within 3 business days.