Browse Forums Building A New House Re: Stormwater design 2Jul 29, 2019 3:52 pm ![]() We are building a duplex with Champion Homes in Sydney. Our council has stipulated a storm water drain be built and the builder has quoted us $80K! We are stunned and not sure how to sense check whether that have over-engineered the solution. Any ideas? We are first time builders but this feels excessive. Like ⋅ Add a comment ⋅ Pin to Ideaboard ⋅ Should note that the volume is 15m3 Re: Stormwater design 3Jul 29, 2019 5:04 pm I've got nothing to add, but I'm not surprised at your shock. Storm water can really break a budget (and dreams). Especially for first timers who don't really consider it until you cop a quote like this. Ouch. Good luck and I hope it has been over engineered for your sake. Re: Stormwater design 6Aug 02, 2019 2:07 pm Hi laurenmillerconcord Without knowing the bigger picture of your land and other information, its a bit hard to make a judgement from your image as to whether this is the most efficient stormwater design. But it does seem odd draining to the right rather than downstream, unless easement have been refused from neighbours. However since you are building a duplex, and if you are building in metro areas, OSD will highly likely be required. Without knowing what the builder has allowed for, 80k does seem to be towards the higher end for this type of stormwater system. R.Koncept Architectural Design & Drafting Affiliate of the Building Designers Association Australia www.rkoncept.com.au Custom Home Designs | Additions & Alterations | Dual Occupancy Specialist Re: Stormwater design 7Mar 24, 2020 5:42 pm I did not proceed with CH a few years ago as they refused to include OSD in the contact due to uncertainty. Another builder sourced two OSD designs for me which were both rejected by Council. I ended up sourcing designs and obtaining DA myself so that I can have more certainty about the building cost down the track. The process was a real pain in the neck and I ended up paying close to $10k just for survey, design and amendment, tree assessment etc. alone. The guidance from the Council was very helpful and after receiving agreement from two departments of Council. The Council Engineer required relocation of the discharge point towards the very end of the process. I feel it is just the nature of the beast, a beast that can consume a lot of energy and dollars. I heard OSD can cost from $20k-100k depending on design. Maybe you can take the plans to the Council to have a quick review if your council has engineers on duty who can provide general comment on the Counter? Plumbers 'can be' plumbers, made all the worse by self certification which the building surveyor invariably accepts as proof of compliance! The good thing is that you know know. 3 4860 ![]() Grab a hose, insert it at the top of the inlet/down pipe and turn the water on and see where the water is escaping from. Then you'll know. 3 8467 in the stormwater pit or the drain? Those dont look like theyd fit in the drain. Separately, the pits do get stuff in them during the course of the build. For the most… 1 7933 |