Browse Forums Owner Builder Forum 1 Aug 23, 2013 8:20 pm Hi all, We are building a 330m2 house and 6x6m shed on P Class soil and so far it has cost $100,000 to get to the stage where the slab is poured and we are ready to build. The house is elevated on one end about a meter and yeah it's pretty bad soil but $100k sounds stupidly excessive. I hear figures or $50,000-$60,000 for a slab on bad P class soils so I must say I'm a bit concerned. Having said that I don't know what people include when they say "slab costs" on here as I'm talking about total spend up to the point of whacking wall frames up. What are people's thoughts? Re: $100k down up to the slab 2Aug 24, 2013 7:48 am Hi Wowzers, Although our soil was classed as H, not P. we spent about $45k for our slab. This included excavation, survey, engineer, drainage and all materials ie: crusher dust, rio, cement, labor etc for the slab. We were fairly lucky that when they were excavation they didn't come across too many obstacles ( just an area on one corner had a chunk of sandstone that they had to minimise) I can't think of any other costs that we incurred to get to that stage..... Our total slab area is 391sqm and that included an attached garage that they poured as a raft slab, whereas the rest of the area was waffle pod. Owner Building on 1800sqm Sanity Intact so far Locked up March 2012 Re: $100k down up to the slab 3Aug 24, 2013 10:28 am A P class site is not a "bad" site. P is not a soil type either. The P means it could be a problem site, either due to trees, or uncontrolled fill, etc. Such problems can be readily addressed at an extra cost (thats the real Problem) There are a myriad of things that can contribute to a costly slab, so unless you give us a blow by blow detail of your works, no one could accurately comment on whether your money is well, or poorly spent. Re: $100k down up to the slab 4Aug 24, 2013 5:25 pm qebtel There are a myriad of things that can contribute to a costly slab, so unless you give us a blow by blow detail of your works, no one could accurately comment on whether your money is well, or poorly spent. No worries. Here is the break down. Engineering - $4,730.00 Cable and Pipe Detection - $154.00 General Hardware Store (bits and Pieces) - $9259.31 Plumbing Supplies - $1,476.43 Concrete/Rio etc - $15,391.25 Concrete Blocks - $5,769.15 Brick Laying - $5,616.00 Excavating - $5846.50 Electrician - $3,405.13 $51,647.77 Labour Project Admin - 46 hours Rough set out etc. - 8 hours Excavation and tree removal - 69 hours Dig Footings 27 - 30 hours Run and dig mains power, footings - 18 hours Box shed & Steel prep - 27 Hours Prep Footings - 63 hours Blocks delivery an stack - 36 hours Garage slab prep, clean site - 12 hours Lay steel - 12 hours Core fill - 18 hours Slab fill - 63 hours Slab prep - 24 hours Foundation bracing - 24 hours Fix storm damage fence (wire). Tree removal - 43 hours Dig fill and jelly - 21 hours Slab prep, plumber prep, dig out, combat weather - 85 hours Slab prep - 200 hours Slab Drain - 22 hours Slab rebates - 30 hours $34,180 Other labour plus cash expenses (still waiting for reconciliation) $20,820.00 Re: $100k down up to the slab 5Aug 25, 2013 12:08 pm 46 hours project mamagement? $9,200 hardware bit and pieces? $20,000 other ? Just the Concrete and reo for a 330m2 slab costs about $4 - 5000, not $15,000. Why is bricklaying included - its a post slab item? What is the soil type? And what is the topography of your block? If youve paid $6000 for excavation you must be on a slope? The hours you've been billed seem grossly exaggerated. Unless you're on some strangely difficult site, you've definitely been done like a dinner on the labour costs, as every item seems to be more than double the actual hours required. Re: $100k down up to the slab 6Aug 27, 2013 10:46 pm It actually reads like you have some kind of retaining wall in there. Blocks, core fill, rebates, foundation bracing, dig and fill jelly and your engineering cost tell me its no a standard flat slab with small rebates for the bathrooms, portico or garage. If that is the case then I doubt you could really compare it with a standard slab, even on P soil. Most slabs are waffle pod design and it reads (looking at hours) that there is a fair amount of reo work and boxing done. Makes me think it is a raft slab on compacted and controlled fill. Is that the case? I would definitely ask for a break down on the "general hardware" and your concrete prices. How long is a "long period"? For a few weeks, it should be ok. 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