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heat loss calcs and maximum allowed area of glass

Discussion in 'Building Regulations and Planning Permission' started by browfish, 12 Apr 2012.

  1. browfish

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    I understand that the area of glass of an extension can be no more than 25% of the new floor area, however you can offset the area off window removed from the original building by the creation of the extension.

    Our extension (internally)will be 28.14 sqm
    the proposed amount of glazing is 12.9sqm
    The amount of glazing removed from old house is 7.4sqm
    Hence the additional glazing is 12.9-7.4 = 5.5sqm

    This as a percentage is 19% of the new floor are so i am ok. Is this right
     
  2. mikric

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    28.14m2 x 25% =7.03m2 allowable
    proposed glazing = 12.9m2
    7.03m2 + existing of 7.4m2 =14.43m2 allowable
    Your proposed amount is less therefore you are ok.
     
  3. browfish

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    Thanks.
    Just wanted to check I hadnt misunderstood it
     
  4. ^woody^

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    Just to be clear, its the area of the 'opening', and not the area of glass
     

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