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building control query-(new regs)

  • 17-12-2007 2:58pm
    #1
    paulmallon
    Registered Users, Registered Users 2 Posts: 104 ✭✭


    I have submitted a plan to building control,an extension to a dwelling
    comprising a lounge plus a utility. The lounge has quite a lot of window opening/door openings. They keep hitting me with this "area of window opening not to exceed 25% of floor area" rule. If I call this lounge a sun room,does that get me round this problem?


Comments

  • #2
    sydthebeat
    Subscribers Posts: 42,312 ✭✭✭✭sydthebeat


    paulmallon wrote: »
    I have submitted a plan to building control,an extension to a dwelling
    comprising a lounge plus a utility. The lounge has quite a lot of window opening/door openings. They keep hitting me with this "area of window opening not to exceed 25% of floor area" rule. If I call this lounge a sun room,does that get me round this problem?

    In order to achieve elemental u values as per regs, ie floor = 0.25 walls = 0.27 etc... an assumption is made that the amount of openings does not exceed 25% of the floor area. this is probably what the building control is referring to. AFAIK this is not a restriction that you need to adhere to, once you can furnish them with u value calculations to show the development complies with the 'overall' heat loss method as per Part L TDG 2005.
    Get your architect / engineer to supply you with these calculations (and pray he doesnt look at you as though you have two heads and say 'what are you talking about'....!!)


  • #3
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    25% rule applies if u value of glazing is 2.2

    If you get better windows then follow figs below where
    A = u value and B = % area

    By the way , why did you submit anything to building control - were you asked to . It's not un heard of but it's not a common occurance


    A
    B
    1.4 42.7
    1.6 36.3
    1.8 31.5
    2.0 27.9
    2.1 26.4
    2.2 25.0
    2.3 23.8
    2.4 22.7
    2.5 21.6
    2.6 20.7
    2.7 19.9
    2.8 19.1
    2.9 18.3
    3.0 17.7
    3.1 17.0
    3.2 16.5
    3.3 15.9


  • #4
    muffler
    Registered Users, Registered Users 2 Posts: 46,607 ✭✭✭✭muffler


    sinnerboy wrote: »
    By the way , why did you submit anything to building control - were you asked to . It's not un heard of but it's not a common occurance
    I was just going to ask this.


  • #5
    Mellor
    Registered Users, Registered Users 2 Posts: 40,064 ✭✭✭✭Mellor


    paulmallon wrote: »
    I have submitted a plan to building control,an extension to a dwelling
    comprising a lounge plus a utility. The lounge has quite a lot of window opening/door openings. They keep hitting me with this "area of window opening not to exceed 25% of floor area" rule. If I call this lounge a sun room,does that get me round this problem?
    As pointed out the 25% glazed area refers to the minimum allowable u-value of glazing.

    There are however regulations regarding the size and position of windows. They are included in TGD Part A. The diagram on page 10 and the text on page 11.
    1.1.3.18 The number, size and position of openings
    should not impair the stability of a wall or the lateral
    support provided by a buttressing wall to a
    supported wall.


  • #6
    paulmallon
    Registered Users, Registered Users 2 Posts: 104 ✭✭paulmallon


    Should have mentioned,im in Northern Ireland so i had to submit it to building control.
    Thanks for all that info guys


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  • #7
    smashey
    Registered Users, Registered Users 2 Posts: 21,676 ✭✭✭✭smashey


    paulmallon wrote: »
    Should have mentioned,im in Northern Ireland so i had to submit it to building control.
    Thanks for all that info guys
    You'll be seeing them quite often then. :D


  • #8
    ardara1
    Closed Accounts Posts: 495 ✭✭ardara1


    paulmallon wrote: »
    Should have mentioned,im in Northern Ireland so i had to submit it to building control.
    Thanks for all that info guys

    Paul - you're allowed 25% opening to floor area PLUS the area of any openings that was lost when you put on the extension. If your still over the alloted area - you will have to upgrade the other elements (Walls floors or roof U-values) to compensate (easy enough to do on a spread sheet - Area x U-value - remember the elemental U-value of the glazing is 2.0 - it will probably be better - put the better value in the calc)

    If it STILL doesn't work - you'll have to taken the EXISTING house into account and do a full SAP assessment - and make improvements in the existing part (New boiler - extra insulation in loft etc)


  • #9
    sinnerboy
    Closed Accounts Posts: 5,433 ✭✭✭sinnerboy


    A1 , can't OP simply up the glazing spec a la TGD Part L ( ROI ) . Or are NI regs different ?


  • #10
    ardara1
    Closed Accounts Posts: 495 ✭✭ardara1


    sinnerboy wrote: »
    A1 , can't OP simply up the glazing spec a la TGD Part L ( ROI ) . Or are NI regs different ?

    Merry Christmas Sinner!!

    No sliding scale in North

    Way I would do it is create a spread sheet Area x Uvalue for each element then total.

    Then add actual glazing area X actual U-value and compare Total - adjust other elemental U-values to match original AxU-value total


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