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Extension costs - double storey + wraparound

Discussion in 'Building' started by Cji27, 19 Sep 2021.

  1. Cji27

    Cji27

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    Hi all,

    I'm looking for an idea of extension costs. I've heard various amounts per sqm, but it's never clear to me what that actually includes.

    We are based in the South West near Bristol.

    We're considering turning our 2 bed into a 3 bed + office (or 4th bedroom/box room depending on how you look at it) with an open plan kitchen diner, a downstairs bathroom and a utility room.

    The ideal option is a 2 story side extension, plus wraparound extension at the back, and porch at the front with garage to the side. This exact extension is on another house of the same style several doors down. It was done quite a few years ago, but I've found the plans online. (see pictures).

    Rear single wraparound would be 8.12m x 3.5m, side double story would be about 3m x 7.58m, front single porch/garage entrance would be about 4.7m x 1.5m.

    Our internal plans would be a bit different though, we would just have a big kitchen diner with bifold doors at the back, and a downstairs shower room & utility room on the side/ the side part of the wraparound, maybe sacrificing some garage space.
    Upstairs we would have 1 small office space and 1 family bathroom in the side extension, and turn our existing bathroom into a double bedroom.

    Any ideas what sort of cost this would be all in? I know it's dependent on kitchen/bathroom choices too though, but just an idea of cost.

    We plan on doing this in a few years time if possible, but we need to understand if what we want to do is cost effective over just moving house. At the moment we're holding off doing other work on the house because we're not sure how long we'll be here, and have no idea if the cost of something like this is plausible. If we can see it working and commit to staying, it means we can make it more enjoyable to live in whilst we save up for the extension.

    An alternative cheaper idea is not to do a wraparound, but just a side double with porch/garage single, and the sing rear kitchen extension but not including the space at the side (so probably about 5m x 3.5m), leaving a square gap between the two extensions.

    Only issue with both ideas is it will remove side access...
    Any other ideas welcome! Thanks

    Screenshot_20210919-154505_Drive.jpg Screenshot_20210919-153509_Drive.jpg
     
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  3. KenGMac

    KenGMac

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  4. mikeey84

    mikeey84

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    £150-£200k, but that is a pretty much worthless estimate given the variables. Might be less, likely to be more.
     
  5. Notch7

    Notch7

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    Do you think you would get planning?

    I’d guess that may exceed % volume increase noted in planning policy framework.
     
  6. Cji27

    Cji27

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  8. Cji27

    Cji27

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    Thanks fof your input, that's a lot more than I thought it would be. That would probably make it unworkable, I think we'd be much better off just moving if that is the case.
     
  9. Cji27

    Cji27

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    We haven't got to that point to be honest, we just wanted to assess costs for feasibility. I assumed we would, as the exact same extenion exists on the house down the road. I washt aware of a limit on volume increase though, I'll look into it. Thanks.
     
  10. JP_

    JP_

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    Get a few local builders to quote using those plans, then go chat with your neighbour and say you like the look of their extension, and ask if they can give you an idea of cost, as you want to compare with some quotes.

    And if all seems OK, you could also contact the person that did the plans and see if they can do you a good deal by reusing them - can't nick them as they might kick up a fuss re copyright. But you could be "inspired" by them and do something very very similar ...
     
  11. mikeey84

    mikeey84

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    It's a lot of m2 in total.

    If my maths is right, about 75m2 extra. Rule of thumb is approx £2k per m2, plus bathroom and kitchen.

    Obviously if I've misread or added up wrong then my number is even more meaningless!!
     
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