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Housing - New Build: How to get an A rated EPC for new build

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  1.  
    • CommentAuthortony
    • CommentTimeFeb 23rd 2014
     
    A friend is going tf it should get U values around 0.15 or even 0.14. The most worrying thing is for me that even with all this upgraded insulation we are still going to fail even the building regulations with an lpg boiler and with a air source heat pump we only just scrape through with a C on the EPC. How on earth is one to achieve an A? he pleads with me -- I said solar pv but it is a speculative house and that wont add value sadly.
  2.  
    £6k for 4kwp pv . What percentage of the budget would that be? Same price as a mid price kitchen.
    • CommentAuthorpmusgrove
    • CommentTimeFeb 24th 2014
     
    Why worry? If you keep the fuel bills for when it is time to sell they can be used to show the inadequacy of the EPC model.
    • CommentAuthordickster
    • CommentTimeFeb 24th 2014
     
    Sadly our new house only just got through with an EPC acceptable to the building society. Reason, underfloor heating driven by LPG combi boiler. We had UFH put in during the build in case one day we run out of logs or are too infirm to use the clearview log burning stove.

    The fact that we don't use UFH and all our space heating and a lot of our hot water (3 x 2.5 l kettles) comes from the stove does not wash with the powers that be. The boiler is seen as the primary heat source.
    • CommentAuthorPaulJ
    • CommentTimeFeb 24th 2014
     
    The best I have achieved is 87 (B) for EER and 88(B) for Env Impact (CO2), and that was with a small solar HW. Without renewables I don't think A is doable.
    •  
      CommentAuthordjh
    • CommentTimeFeb 24th 2014
     
    Why does your friend want to get an A? Aren't there enough examples around to have thoroughly discredited the system yet?
    • CommentAuthorTriassic
    • CommentTimeFeb 24th 2014
     
    The builders of the EPC system software must have modelled an A rated house, mustn't they? So there must be a description of it somewhere?

    Regarding the EPC rating of the speculative build, from recent experience suggests the buyers won't give a hoot as to the EPC rating.
    • CommentAuthorskyewright
    • CommentTimeFeb 24th 2014
     
    Posted By: PaulJThe best I have achieved is 87 (B) for EER and 88(B) for Env Impact (CO2), and that was with a small solar HW. Without renewables I don't think A is doable.

    camillitech's new build managed 104 & (I think is says) 105, but that's off-grid with renewables.

    http://www.navitron.org.uk/forum/index.php/topic,15679.0.html
    • CommentAuthorJonti
    • CommentTimeFeb 24th 2014
     
    Posted By: tonyA friend is going tf it should get U values around 0.15 or even 0.14. The most worrying thing is for me that even with all this upgraded insulation we are still going to fail even the building regulations with an lpg boiler and with a air source heat pump we only just scrape through with a C on the EPC. How on earth is one to achieve an A? he pleads with me -- I said solar pv but it is a speculative house and that wont add value sadly.


    How do the bigger building companies manage it then taking into account the rubbish that they build? Is it a case of the plan being rated rather than the building itself?

    Jonti
    • CommentAuthorborpin
    • CommentTimeFeb 24th 2014
     
    Chatting with my architect this week and he was saying that a PV system makes a disproportionate difference. You can downgrade the insulation and still get A with PV included. Not even sure if the SW takes any notice of the actual yeild (shading, direction etc) or if it is just done on the Peak capacity.
    • CommentAuthorFred56
    • CommentTimeFeb 24th 2014
     
    Floor 0.11, roof 0.1, walls 0.14, I ACH, 2kWp PV, natural gas combi zoned TRVs, 4 x DMEV, not very good DG = 93 A rated on SAP 2010.

    Airtightness makes almost no difference on SAP, system favours natural gas so off-grid disadvantaged.

    Q - Why is there no compressed natural gas supply chain? Is the energy density of methane so low that it is not viable?
    • CommentAuthormarkocosic
    • CommentTimeFeb 25th 2014
     
    SAP favours coal actually as it's dirt cheap. ;-)

    http://www.confusedaboutenergy.co.uk/index.php/domestic-fuels/fuel-prices#

    Try a coal fired CHP for maximum SAP points.


    Bigger building companies use allowable solutions to cheat the regs cheaply.

    http://www.solarblogger.net/2014/01/zero-carbon-homes-hierarchy.html


    Biomass is the other favourite. If you engage in energy laundering - burning diesel in order to deliver wood which you then burn - that's all ok apparently.
    • CommentAuthorSeret
    • CommentTimeFeb 25th 2014
     
    Posted By: Fred56
    Q - Why is there no compressed natural gas supply chain? Is the energy density of methane so low that it is not viable?


    The infrastructure for gas was already there, it was originally put in (and sized) for town gas. When natural gas came along it hugely increased the amount of energy that network could carry with minimal modification.

    Some countries do have a CNG infrastructure, it's used for vehicles. Chicken and egg problem though.

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