Browse Forums Building A New House 1 Jan 09, 2015 7:39 am Hi everyone Apologies if a thread already exists for this- I am still learning. Our block has surprised us and while it looks pretty flat with a gentle slope- turns out there is 2m of fall across the entire block front to back (50m deep block) and probably 600mm-1m across the build area (4%). We also do not have a storm water easement at the back boundary and have been told we cannot connect up to the one at the front. We are wondering what this is likely to mean in terms of: -additional site costs inc drop edge beams -cut and fill -retaining walls -storm water pits/water tanks -whether we will need to have a step down at the back of the block I was hoping for some advice from someone who has been through something similar and has the real costs to show rather than a salesperson grossly underestimating the costs prior to tender. We are in the Sutherland Shire Council area if that makes a difference. Does cut and fill avoid additional slab costs/drop edge beams/retaining walls? Apologies if that is a stupid question. We like designs by Coral, Eden Brae and Rawson. We have found Rawson to be very open with pricing. EB has been pretty good but Coral only inc 600mm cut and fill in their quote and nothing for drop edge beams or additional slab costs. M Y C U S T O M C O R A L B R O N T E 43 ...............Kitchen! 16 Nov 2016 https://forum.homeone.com.au/viewtopic.php?f=31&t=79581 Re: Site costs for a 4% slope front to back 2Jan 09, 2015 3:30 pm With regards to drop edge beams you will need them to retain the fill under your slab (see http://www.anewhouse.com.au/2013/07/drop-edge-beams/) As far as the storm water connection goes. . . Is it you are not allowed to connect at all? OR. . .That you can only connect indirectly through a Detention Tank? If you need a detention tank it can easily add $20,000 to your site costs (see http://www.anewhouse.com.au/2014/06/on- ... n-storage/) for some more information. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Site costs for a 4% slope front to back 3Jan 09, 2015 6:32 pm Thanks bashworth. I think they were suggesting that we just couldn't connect to the existing storm water. The block looks flat in the yard. I know it's obviously not but wondered if we could possibly escape the need for detention tanks or whether I'm dreaming M Y C U S T O M C O R A L B R O N T E 43 ...............Kitchen! 16 Nov 2016 https://forum.homeone.com.au/viewtopic.php?f=31&t=79581 Re: Site costs for a 4% slope front to back 4Jan 09, 2015 8:13 pm Even with a detention tank you will still need to discharge to some storm water drain (unless you are building on sand and use soakwells) You really need to go and talk to the council yourself and find out what they suggest for stormwater. The Harder You Try - the Luckier You Get ! Web site http://www.anewhouse.com.au Informative, Amusing, and Opinionated Blog - Over 600 posts on all aspects of building a new house. Re: Site costs for a 4% slope front to back 5Jan 12, 2015 7:54 pm Hi MrsJM We are also in Sutherland Council area with a sloping block to the rear. Sutherland are quite specific about their requirements in regards to stormwater management. If you can't drain to the street we were advised that we had to seek easement through downstream properties to connect to existing stormwater, and if all these possibiliities were exhausted, only then would they consider other options such as detention/absorption pits etc. They have a section in their DCP about stormwater and standard letters you can use when talking to neighbours. After lengthy negotiations we have obtained easement though the property adjoining ours, but it has been quite a process!! If you have a survey of your block, go into Council and talk to the duty planner and also ask to speak to one of the engineers. It is much easier to talk through in person with them. Happy to explain in more detail if you like, or how our costs have panned out. Just pm me. Good luck! Re: Site costs for a 4% slope front to back 6Jan 12, 2015 8:27 pm BecD Hi MrsJM We are also in Sutherland Council area with a sloping block to the rear. Sutherland are quite specific about their requirements in regards to stormwater management. If you can't drain to the street we were advised that we had to seek easement through downstream properties to connect to existing stormwater, and if all these possibiliities were exhausted, only then would they consider other options such as detention/absorption pits etc. They have a section in their DCP about stormwater and standard letters you can use when talking to neighbours. After lengthy negotiations we have obtained easement though the property adjoining ours, but it has been quite a process!! If you have a survey of your block, go into Council and talk to the duty planner and also ask to speak to one of the engineers. It is much easier to talk through in person with them. Happy to explain in more detail if you like, or how our costs have panned out. Just pm me. Good luck! Our slope is 2m front to back (50m deep block). Do you mind if I ask what the slope on your block is? When you say seek easement through your neighbours block, what does that involve and what is the impact or risk to the neighbour? I'm guessing the neighbour can say no and it's game over? Was this solution cheap? The builder just suggested a pit could work for $2k (not a detention pit- something about digging a hole with gravel- is that what Sutherland council doesn't like?) I'm so scared this is gonna cost us a bomb for a yard that feels flat when you're in it! M Y C U S T O M C O R A L B R O N T E 43 ...............Kitchen! 16 Nov 2016 https://forum.homeone.com.au/viewtopic.php?f=31&t=79581 Re: Site costs for a 4% slope front to back 7Feb 28, 2015 10:47 am Hi, I've just stumbled across this post and I thought I'd add. We have been looking at building for about a year now in the sutherland shire. We have about 800mm cut in the back corner and 700mm fill in the front corner. (About 1.5m fall towards the road). One builder quoted about $10000 for the additional drop edge beams required and another quoted about $5000. Different designs but similar size DEB required. One builder didn't consider stormwater in their quote at all and the other had a provisional allowance of $10000 for onsite detention pits etc. in saying this though, our land does drain towards the street. I do know that sutherland council does require onsite detention for all rainwater runoff so their drainage system doesn't get overloaded. In our case it should just be as simple as a larger rainwater tank to hold the rain before it gets released into the councils system. A friend built in bankstown council and had slope to the rear of the block. They had to somehow get the water uphill toward the street. (Maybe they couldn't get an easement). This cost 10's of thousands I believe. As for retaining walls, we have had a quote (only one so far) for about $400/m2 for interlocking blocks. We are sooooo far from needing retaining walls we will hold off with getting more quotes for now. Not sure how much this helps?? Re: Site costs for a 4% slope front to back 8Feb 28, 2015 9:21 pm Quote: If you have a survey of your block, go into Council and talk to the duty planner and also ask to speak to one of the engineers. It is much easier to talk through in person with them. As per what BecD is saying. Face to face with a town planner and/or council engineer is the only way to get the correct info. Forget what the building company is saying to you. They have their vested own interest at heart not yours. Stewie A survey must’ve completed by a certified surveyor. This form part of every DA requirement 3 223588 Need advice on the backyard plan above. Should I excavate and cut all of the dirt to level with the house slab or semi-excavate as per photo above? Both left and right… 0 24831 Hi All, We have recently purchased a sloping block (3.5m fall building envelope, 6m overall). 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