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Housing - New Build: Passivhaus in Yorkshire

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  1.  
    • CommentAuthorcaliwag
    • CommentTimeOct 8th 2009
     
  2.  
    certified or not certified that's the question.

    J
    • CommentAuthormenzies
    • CommentTimeOct 8th 2009
     
    • CommentAuthorsipman
    • CommentTimeOct 8th 2009
     
    Caliwag

    do you have an air pressure test result

    Sipman
    • CommentAuthorcaliwag
    • CommentTimeOct 8th 2009
     
    Sorry, I just picked this up from yesterday's Yorkshire Post. Whilst there are asdsorted blogs and diaries on the attachment (with quite a few comments, I note) the photo accompanying the newspaper article indicates that the house is not complete...so a test to follow I guess!!
  6.  
    £1200 / sqm = inexpensive eh...?

    J
    • CommentAuthorjamesingram
    • CommentTimeOct 8th 2009 edited
     
    what youbuilding your 2 for James? £/m2
    £1200/m2 sounds ok , whats the ballpark figure currently for small new build developers
    ( I thought it was around a £1k/m2)
    I do mainly refurb and its often £2000/m2 +

    cheers Jim
  8.  
    Posted By: jamesingramwhats the ballpark figure currently for small new build developers
    ( I thought it was around a £1k/m2)


    so £1200 is not inexpensive. Not exorbitant and comparable with upper end development but not inexpensive.

    (me about 950 inc lots of free stuff).

    J
  9.  
    ...I should shut up really, well done them!

    :bigsmile:

    J
  10.  
    Ouch. Our newbuild came in at around £590/m2 - guess that just confirms the UK 2X price differential compared to things on this side of the Atlantic.
  11.  
    GIA of course.

    J
  12.  
    Having said that, checking the text the £140k doesn't seem to include the high end appliances and PV required by PH or solar thermal, any external works, flooring other than kitchen, decoration, garage, solar shades, utility connections, statutory fees, financing costs, consultants fees, (not least the PHPP man....)...

    ...methinks more like £170k or £1450/m2...

    Its the cost of climbing up that curve of diminishing returns. PH is a worthy goal and in my view better than spending £1400/m2 on integrated hi-fis and vacuum cleaners and tasteless expensive finishes + fittings etc but "inexpensive" it isn't.

    J
    • CommentAuthorjamesingram
    • CommentTimeOct 8th 2009 edited
     
    Read in GBM Passivhaus costs in Germany initially 10% above normal costs reducing to 0-4%
    Netherlands 8-12% due to few peojects
    Not that up on large scale house builders build costs , but I find it hard to believe these figures
    I'd have thought it would be higher . Especially if backup heating is fitted.
    •  
      CommentAuthordjh
    • CommentTimeOct 8th 2009
     
    Posted By: James NortonHaving said that, checking the text the £140k doesn't seem to include the high end appliances and PV required by PH or solar thermal, any external works, flooring other than kitchen, decoration, garage, solar shades, utility connections, statutory fees, financing costs, consultants fees, (not least the PHPP man....)...

    Well there's a primary energy budget that is generally agreed to be too high - Carbonlite reduces it further - so I don't think top-of-the-range appliances are needed though careful selection is on order. PH says nothing at all about renewables, least of all PV. Feist even recommends heat pump 'compact units' so is on the side of the anti-christ in some eyes. PHPP is just a spreadsheet that costs £130. Dunno about the rest, that could definitely mount up.

    Cheers, Dave
  15.  
    Well done Geoff and Kate, I remember exchanging a few emails with them this time last year, I'm delighted they succeded. If you think about it a Passive House needn't be that much more expensive when you calculate the extra insulation at €7k. Better windows for €7k and extra time and tape doing the Airtightness.
    You can easily save this by not having a heating system.

    For PassivHaus you need 3 things, 15Kw/m2, 120Kw/m2 overall and an airtightness test of 0.6.
  16.  
    Posted By: James NortonGIA of course.
    What does GIA mean?
  17.  
    GIA ="Granny in the attic "?
    •  
      CommentAuthorfostertom
    • CommentTimeOct 8th 2009
     
    God is Angry
  19.  
    PiM

    Gross internal area.

    Dave,
    With a certified PH you need an accredited assessor to not just the spreadsheet (the manual to which is about an inch thick), this costs small no.s of £ks alone.

    As to PV I think you'll struggle to get the primary energy down without either top of the range appliances/lighting or PV... so you have to include at least one of these in the build costs. To be honest the bigger costs are in the other omissions:

    Posted By: James Nortonany external works, flooring other than kitchen, decoration, garage, solar shades, utility connections, statutory fees, financing costs, consultants fees,


    PH need not be exorbitant but should be compared with other upper end specification choices I mentioned. As such good on them for putting their money where their mouth is...

    But we should all still at least aspire to PH or AECB.

    :bigsmile:

    Generally I'd reckon on about 10-20% above average or = to a upper end house. But what I'm interested in is the incremental cost above something around AECB Silver or around CfSH 4 ish which really can be achieved for a minimal increase if designed well. I think this is probable the sweet spot on the afore mentioned curve.

    J
    •  
      CommentAuthordjh
    • CommentTimeOct 12th 2009
     
    Posted By: James NortonAs to PV I think you'll struggle to get the primary energy down without either top of the range appliances/lighting or PV... so you have to include at least one of these in the build costs.

    FWIW, PHPP does not subtract any PV that you have from the primary energy total. So adding PV does not get you home free if the house uses too much energy. Unless there's a bug in PHPP :confused:
  21.  
    Ah interesting... ...was pretty sure it did, but last time I looked at PHPP was a year or so ago! But if it doesn't then you're into the appliances again?

    J

    (off to go and have a proper look at PHPP) :wink:

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