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Ballpark $'s for extension

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  1. #1
    Golden Member HappyHammer's Avatar
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    Default Ballpark $'s for extension

    I have had plans drawn up for a two storey extension on my house. It is relatively simple with downstairs being a 10m x 4.8m garage with auto door and the upstairs being a verandah / balcony screened down the 10m side with timber slats. The is also an internal staircase from the garage up to the balcony. We will also be extending the existing roof to cover the balcony.

    I have given the plans to a builder and I'm waiting for the quote. Has anyone done something similar or able to give me a guesstimate range of where they think the quote will come. I have no clue whether I should be expecting $50K or $100K.

    HH.
    Always look on the bright side...

  2. #2
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    The price may Depend on many factors. Is the first floor a suspended concrete or timber framed? What are the floor finishes? What type of roof? It the site relatively level or will you require cut/fill and retaining walls?

  3. #3
    A Member of the Holy Trinity silentC's Avatar
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    Rough guide is about $1000 per square metre. Add 10% or so for two storey.
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  4. #4
    Golden Member HappyHammer's Avatar
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    Quote Originally Posted by TARLOX
    The price may Depend on many factors. Is the first floor a suspended concrete or timber framed? What are the floor finishes? What type of roof? It the site relatively level or will you require cut/fill and retaining walls?
    It's timber framed with 18mm sealed board which will be tiled. The site is level. I assumed the construction itself would be the major part of the cost so left these details out?

    The roof is this shape
    Attached Thumbnails Attached Thumbnails roof.jpg  
    Always look on the bright side...

  5. #5
    Golden Member HappyHammer's Avatar
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    Quote Originally Posted by silentC
    Rough guide is about $1000 per square metre. Add 10% or so for two storey.
    So roughly $55K......
    Always look on the bright side...

  6. #6
    Taxpayer again! Shedhand's Avatar
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    Default My extension ballpark cost

    My extension is single storey on a suspended polished concrete slab. Class "A" site (easiest to build on). Size approx 36m2.

    Ballpark 3300/m2 = 105k.
    My response? You're jokin'.:eek:
    Their (the architects ) response? Ok we'll sharpen the pencil.
    My response? You can start by knockin' 33.3% off! :mad:
    Their response ..OK!

    I reckon about 70k will pull it up and that includes a new kitchen, two 3metre wide trifold external doors, polished concrete deck and verandah, reroofing the original part of the house and landscaping.
    Cheers
    The Shedhand
    Hawks in 2008



  7. #7
    In with the new namtrak's Avatar
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    I reckon you could be looking at anything between $1000 and $2500 per sqm. Sort of depends on a squillion different things.

    Here's some costing estimates I came up with for our extension

    Renovation Costs etc

  8. #8
    Golden Member HappyHammer's Avatar
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    Thanks Namtrak looks like I'm back to between $50K and $100K.

    Great thread by the way, was it worth taking it all on yourself?

    HH.
    Always look on the bright side...

  9. #9
    Dextrophobe LineLefty's Avatar
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    We just paid a Quantity Surveyor $300 an hour to do some estimates on the cost of constructing a car park. It's bloody hard work obviously. If you can, get hold of a copy of the Rawlinsons Construction Cost Handbook thing. You're library might have it.

    Just checking......two storey.....residential......high standard finish..........1300-1375 per sqm. Thats construction, not extension though.
    Cheers,

    Adam

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  10. #10
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    New building costs are at present about $5000 per square.( 1 Square = to 9M2 )
    For extentions it could double depending on whats needed.

    Al

  11. #11
    A Member of the Holy Trinity silentC's Avatar
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    New building costs are at present about $5000 per square
    Jeez, builders up here are quoting $10k to $14k per square. I shoulda built the new house down there and had it shipped up!
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  12. #12
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    Quote Originally Posted by silentC
    Jeez, builders up here are quoting $10k to $14k per square. I shoulda built the new house down there and had it shipped up!
    I talking to a mate of mine last week whos a small time builder.
    I was telling him about the house we are thinking of building once the Craporioum is over and done with.

    And he said $5000 per sq is about the going rate.

    I think the volume sausage factory builder would do it for about $3000 per sq. ( that would be their cost price )


    Im in the procces of drawing up some plans, it'll be solid brick of course.

    Al

  13. #13
    A Member of the Holy Trinity silentC's Avatar
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    Your average 28-30 odd sq. brick veneer is $300,000+ up here. Even Masteron Homes charge over $200,000 + site costs for a 26 sq. MacMansion.

    The retirees from Melbourne must scream like stuck pigs when they get their dream homes built up here then!! Some of these retired people build mansions, don't know why they need such big houses when there's only two of 'em. Anyway, it's their fault that local people can't afford to build a house any more.
    "I don't practice what I preach because I'm not the kind of person I'm preaching to."

  14. #14
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    Here is a local paper clipping, showing new house prices on your land.

    It works out to $6000 per sq.

    Al
    Attached Thumbnails Attached Thumbnails house-prices.jpg   house-prices1.jpg  

  15. #15
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    $6000 per sq for a new project home sounds about right. But dont forget that price does not usually include floor coverings, curtains light fittings etc etc.

    You would probably pay at least double that price to get the average builder to do some work and even more again for an extension.

    Just out of interest, im working on a new house at the moment where the owners are paying the builder $5000 per square metre for their new 'weekender' in the country. Yes that rate is per square metre.

  16. #16
    1K Club Member journeyman Mick's Avatar
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    Quote Originally Posted by silentC
    Jeez, builders up here are quoting $10k to $14k per square. I shoulda built the new house down there and had it shipped up!
    Darren,
    freight charges currently are $5K to $7K per square.



    Quote Originally Posted by ozwinner
    Im in the procces of drawing up some plans, it'll be solid brick of course.
    Windows, doors, plumbing all in brick!

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  17. #17
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    Quote Originally Posted by journeyman Mick
    Windows, doors, plumbing all in brick!

    Mick
    Why not?
    Ill just leave a sledgy outside as the key..

    Al

  18. #18
    Golden Member HappyHammer's Avatar
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    The builder came around with the quote last night and it came to $70K. That's for a 10m x 4.8m garage (all brick) , doors at either end, a 10m x 4m veranda above the garage, extending existing roof by 4m and a staircase at the rear for access to the veranda. Price also includes all finishing off and tiling for the veranda, stainless steel cable fence at either end topped in timber with a timber screen the full length of the veranda. What do ya reckon?

    HH.
    Always look on the bright side...

  19. #19
    plane mad graydog's Avatar
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    i'm a certified QS and as a ballpark figure that seems OK to me.

  20. #20
    Golden Member HappyHammer's Avatar
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    OK looks like the planning permission is about to come through for the extension, went with the quote described previously in this thread.

    Once complete I'll have a garage measuring approx 4.8m x 9m and I now need to start thinking about how to set it up.

    The first picture is the blank canvas...

    My wife wants to put her car in the smaller of the two garages which means I'll have to put my tinny in the larger one which limits storage etc.

    One thing I would like is a long bench along one wall as per the second attachment with Chop Saw, Bench Drill press etc and a straight edge running the full length of the bench, any thoughts on this welcome.

    HH.
    Attached Thumbnails Attached Thumbnails garage-blank.jpg   garage-plan-1.jpg  
    Always look on the bright side...

  21. #21
    Taxpayer again! Shedhand's Avatar
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    Talking My suggestion

    Great plan but I reckon this looks better.
    First, dump the missus and give her the shopping trolley (tiny car).
    Then, put the washing machine in the bathroom, put the tinny where the ex's car was.
    Then put your dust collector and timber stock in the ex laundry and use the space formerly occupied by the tinny as a much bigger workshop.
    Then put a fishing rod rack where you have the Triton timber rack. The bonus is that you can put your beer fridge next to the rod rack.
    The Shedhand
    Hawks in 2008



  22. #22
    1K Club Member journeyman Mick's Avatar
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    HH,
    is it possible, headroom-wise to hoist the boat up to the rafters to make more space? When I had a boat I used to wheel it out of my workshop in order to work. Bit of a pain, especially when the weather was good .

    Mick
    "If you need a machine today and don't buy it,

    tomorrow you will have paid for it and not have it."

    - Henry Ford 1938

  23. #23
    Golden Member HappyHammer's Avatar
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    Unfortunately not Mick, I will be wheeling the boat out when I need the room although it's easy to move around by hand as it's pretty light on the trailer.

    Sorry Shedhand gotta keep the missus, who'll look after the kids so I can spend time in the workshop

    HH.
    Always look on the bright side...

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