Browse Forums Building A New House 1 Nov 09, 2009 9:21 am Hi all, Can anyone give me an idea of how much an M class or H class slab would cost for a 44square house? We have had the soil report come back recommending an M class slab. The builder is costing in $16000 for a H class slab saying they will need to do another soild test after we demolish so the amount is only provisional. Our site costs in total will be over $32000 as we have a P site. Does this sound reasonable? I don't think we should sign the contract until they change the pricing to the M class slab. How much cheaper would M class be? Any help would be greatly appreciated! Re: SLAB costs M vs H 2Nov 09, 2009 9:40 am I had to had an H slab due to the soil being clay. The slab is pretty huge -- if if had a pure rectangular form, it would be 14x21 metres (in reality it's areas is a bit less due to a more sophisticated perimeter but I believe it should be enough to give you a rough idea). You could check exact dimensions by looking at the picture in my thread. So, it my tender, the variation for upgrading an M-class slab to a 32 Mpa H-class slab was $4,655.00. My personal opinion is that the better foundation you get is better. ... built a Promenade with Clarendon. viewtopic.php?f=31&t=25104 20-10-09 - excavation and piering completed ... 12-04-10 - Basins fixed. Connecting to the electrical grid 23-04-10 - PCI 07-05-10 - HANDOVER! Re: SLAB costs M vs H 4Nov 09, 2009 11:17 am I wished I could answer that question. The slab M was a part of standard site costs of $15,860.00 while the upgrade from M to H was a variation costed separately. The standard site costs included the following: - 60 linear metres of piering (400 mm diameter, 900mm deep) - sewer connection - stormwater constructions and connection - water connection - concrete handling - earthworks - slab Class M - underground Power - 3 phase provision + a Telstra lead. I could be guessing that the slab alone was around 10K mark.. But this just a guestimate ... built a Promenade with Clarendon. viewtopic.php?f=31&t=25104 20-10-09 - excavation and piering completed ... 12-04-10 - Basins fixed. Connecting to the electrical grid 23-04-10 - PCI 07-05-10 - HANDOVER! Re: SLAB costs M vs H 5Nov 10, 2009 8:01 am mmm....donuts Homer Simpson 1956- Links: Site Costs Ready Reckoner | H1 Addiction Medical Advice | Château TDL: The Backyard Re: SLAB costs M vs H 6Nov 10, 2009 11:13 pm If the soil test report recommends M class slab then I would advise you to go for M class. I've no choice but to pay $10k more for H slab because of the highly reactive soil condition for my block. H class is required to guard against the high ground movement from moisture changes. There is this very good article I would recommend you have a read: Foundation Maintenance and Footing Performance: A homeowner's guide by CSIRO. See if you can get a copy from CSIRO. No point to pay more for something you don't need, go for M. Re: SLAB costs M vs H 7Nov 11, 2009 6:31 am You want the right slab for your soil conditions, or you're going to get movement and cracking and possibly worse. A provisional cost is a maximum amount allowed "just in case". I'm assuming that access under your existing house for soil testing isn't available? In which case, if the new house is to be built on that part of the block, additional soil testing after demolition makes sense...theoretically, the soil under the house may have different characteristics to elsewhere on the block. Usually what happens is that if the upgrade to the slab isn't required, you don't pay the extra (or you may have to pay some extra, if some additional work is needed). We needed an H-class slab, because of reactive soil, but we were told we might also need piering due to fill and proximity to the sewer, so site costs of $14500 were allowed for. In the end, the piering required was less than expected, and total cost ended up at $12,000. That was the cost of the upgraded slab, which included our al fresco room and porch (those were not included in an M-class slab), plus piering for part of the slab. We were sent a post-contract variation for the difference and the amount was refunded to us out of our final progress payment. M-class slabs plus site scrape, minimal excavation, connections for a standard-sized block etc are usually included in the house price and not costed separately. It's only upgraded costs that you'll be given a price on. We weren't thrilled about paying extra, but we don't want our house falling apart due to soil movement either. Besides, I think you'll find that builders simply won't do the job with an unsuitable foundation, as there would be warranty implications for them, so it's not like you get a choice. If you think you're being ripped off, you can always get your own soil tests done independently. Re: SLAB costs M vs H 8Nov 13, 2009 12:17 pm Thanks everyone of the helpful replies. To clarify, it is not the soil test results that I am questionining. In fact I am happy to go with what is recommended. However, the builder is charging me for a slab that is an upgrade to what is recommended in the soil test report. The builder, relunctantly has now agreed to reflect in the contract, what is recommended in the report ie an M class, so for now I am happy The current house is on a slab, so once we demolish, we will have to do another soil test. I am happy to pay the extra upgrade costs IF the soil test report recommends a different slab. Re: SLAB costs M vs H 9Apr 29, 2016 12:33 pm Just reviving an old thread because we have the same question at the moment. For a 21-square house (building in Sydney), does anyone know the cost difference (approximately) between M and H1 Slab? TIA for responses. skyler *o* Re: SLAB costs M vs H 10Aug 04, 2016 11:19 am Hi skyler! We were charged $3420 to upgrade from M to H1. How much was charged to you? skyler Just reviving an old thread because we have the same question at the moment. For a 21-square house (building in Sydney), does anyone know the cost difference (approximately) between M and H1 Slab? TIA for responses. Re: SLAB costs M vs H 11Aug 04, 2016 1:45 pm I think you will find that because it is a KDRB (knock down and rebuild) that the H class will get recommended because of the disturbed soil conditions of the previous builds. I think I read that somewhere. I am on reactive clay and went with the engineers H2 engineering of my slab plus I went with recommended (Not essential) extra steel and went with a 100mm top versus the minimum 80mm top. Mine is a waffle pod slab. The extra steel and extra 20mm top was on my coin but I feel it was worth it. I am not sure whether Perth has its own way of doing things in regards to this. Most of Perth has class A (sandy soil), except for some areas near rivers or hills. 2 13091 Looking to tile the facade pillars rather than rendering. Builder is quoting 2500$ laying cost for upto 10msq. The 2 pillars come to be 16msq. So laying costs are 5000$… 0 7542 10 15744 |