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Green Building Bible, Fourth Edition
Green Building Bible, fourth edition (both books)
These two books are the perfect starting place to help you get to grips with one of the most vitally important aspects of our society - our homes and living environment.

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      CommentAuthornigel
    • CommentTimeAug 11th 2017
     
    Well my 5 bed Georgian farmhouse was rated as F in 2014 , I have install EWI, Double glazing, Heat recovery, solar DHW, PV, draught proofed etc etc.

    Energy Costs per annum are Pellets £550 Briquettes for stove £200 Electricity £400 and I have a plug in hybrid on the electricity.

    The EPC says it will cost £3000 per annum just to heat my house. Its only wrong by a factor of 3.

    Most people take absolutely no notice of the EPC, not because its inaccurate but because they don't think its important.
  1.  
    The most useful number from an EPC is the Floor Area !
    • CommentAuthorgravelld
    • CommentTimeAug 11th 2017 edited
     
    Posted By: nigelThe EPC says it will cost £3000 per annum just to heat my house. Its only wrong by a factor of 3.
    LOL. Interesting, because according to the AECB (https://www.aecb.net/wp-content/uploads/2013/02/Combined_PHPP_SAP_FINAL.pdf) they found SAP often underestimated the space heating requirement for low energy houses - PHPP giving something more accurate.

    Ah - but in your case was the EPC derived from a visit and assumed values? Guess they won't count the EWI because the people who installed it were wearing the wrong badge?

    Wonder what @djh has found?
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      CommentAuthornigel
    • CommentTimeAug 11th 2017
     
    They did visit and they did count the EWI as I made sure they did.

    The assessor was observed standing on a ladder holding open the loft hatch, ipad in hand photographing the loft insulation whilst as the same time holding a tape measure to prove that the stated level of insulation was installed.

    The floor area they came up with was about 2/3rds of the actual so the whole thing was worryingly inaccurate.

    Part of the problem was also down to the boiler not being on the right list so was treated as being 65% efficient.

    The whole thing is so random as not be worth bothering with unless you have to meet a certain score for a reason.
    • CommentAuthorMackers
    • CommentTimeAug 11th 2017
     
    Good luck with the sale.
  2.  
    Posted By: gravelld SAP often underestimated the space heating requirement for low energy houses - PHPP giving something more accurate.


    I found that to be the case also. My SAP estimated 8kWh/m2/year and PHPP estimated 11kWh/m2/year.
    •  
      CommentAuthordjh
    • CommentTimeAug 12th 2017
     
    SAP and PHPP use different measures of floor area, so it's perhaps more interesting to compare the overall heating total than the /m² figures.
  3.  
    Thanks for the words of support all . Property details here:

    http://www.harryharper.co.uk/property/?ref=00001571
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