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Guestimates for new garage dug into sloping block

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  1. #1
    Apprentice (new member)
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    Jun 2010
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    Sydney
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    Smile Guestimates for new garage dug into sloping block

    Currently living in a 3b/room double garage house. We plan to convert double garge to extra living plus a study. This means we will need a new garage.
    We live on a block that slopes up, with probably 2meters elevation above the street.

    Our current idea is to demolish the driveway, and dig into the hillside (my guess is approx 3m deep to allow for 2.4m ceiling and slab) to make the roof of the new garage (suspended slab) to be level with the front of the existing house. So imaging the new double garage to be where the cars used to sit onthe driveway infront of the current attached garage. I plan to use a concrete slab, besser block wall construction with waterproofing, and then a floating slab ontop to allow for a "split level" style situation above in the form of an open area with awning or whatever.

    By the way it will be a detached garage so no tying into the slab of the house or anything like that.

    Anyone done this before or have any guestimates of what a project like this would cost i.e excavation, concreting, bricklaying etc?

    Cheers
    Greg

  2. #2
    Senior Member
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    Sep 2008
    Location
    Melbourne
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    $60,000 - $100,000

  3. #3
    Old Chippy 6K
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    Mar 2007
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    Canberra
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    Depends what they hit when they dig! In Sydney that could be sandstone and the cost of excavation alone might be what Eastwing says. So guesses are pretty useless in that situation. In any case best to get a couple of real estimates for the cut (& I assume removal of fill too?) before looking at the structure. The structure might vary too depending what the geology is underneath it, but once that is known is a pretty straightforward thing to estimate.
    Advice from me on this forum is general and for guidance based on information given by the member posing the question. Not to be used in place of professional advice from people appropriately qualified in the relevant field. All structural work must be approved and constructed to the BCA or other relevant standards by suitably licensed persons. The person doing the work and reading my advice accepts responsibility for ensuring the work done accords with the applicable law.

  4. #4
    Apprentice (new member)
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    The general soil type in the area is just clay. Iknow this from some excavation work i had done in the back yard.
    You are correct in saying the cost of removing fill may be expensive but I used a guy previously that took away 10 tonnes of fill for $300 a load, so i'd probably use him.

    The alternative to this "dig in" would be for me to build a new 1.5 car garage infront of the origninal one, but this would involve digging up the driveway, pouring a slab and joining it to the roof anyway so im not sure if there would be much difference in the price in the end.

  5. #5
    Senior Member
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    Mar 2011
    Location
    Geelong
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    my mate did one 7m x 10m dug in... it cost him just over $80k. like bloss said though, it depends a lot on your geology. your best bet, is to get your soil test done because you will require it either way. once that is done, consult your engineer. this will help you firm up your estimates! hope this helps!

  6. #6
    Novice
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    Dec 2009
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    Sydney
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    I am in the finishing stages of doing just this sort of thing owner/builder on the north side of Sydney. Double garage (6.5m x 6.5m) built out the front of the house. So far about $65k. Major costs were: excavation $15k (7 truck and trailer loads of dirt as I dug down about 1.3m or so and 5 days excavation), $8k bottom slab, $14k suspended slab roof, $5k for bricks/blocks (block below ground, face brick above and commons for the double brick inside) and $8k brick laying and the rest is all the extras like sand, cements, pipes etc. Probably another $5k worth of tiling on the slab roof to finish it off. This cost doesn't include the drafting and DA costs.
    Happy to give you some referrals for the people I used.

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