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Rear Dormer "additional Roof Space"

Discussion in 'Building Regulations and Planning Permission' started by lizpearce82, 28 Jul 2014.

  1. lizpearce82

    lizpearce82

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    Hi

    We are looking at doing a loft conversion but need a dormer on the back for the height of the bedroom & bathroom we are adding.
    The roof is currently a pitched roof - only used for storage.
    We are looking for clarification of what "additional roof space" actually means in Class B. Is it;
    1. the extra space we are adding, on top of the volume in the pitch already - i.e. the cubic capacity of the added dormer only; or
    2. the extra space we are adding to the house - i.e. the cubic capicity of the existing pitch (which is not currently habitable) and the dormer?

    Sorry of this has been answered in other threads, I just cannot find a definative answer anywhere!
    Many thanks in advance
     
  2. tony1851

    tony1851

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    It is your point 1 - additional roof volume.
     
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  4. lizpearce82

    lizpearce82

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    Tony1851

    Many thanks - that's how I read it, but cubic capacity of 50m3 or less must cover most dormer extensions so we just wanted to check.

    Thanks again
     
  5. clifford1

    clifford1

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    Unless of course you mean an inverted dormer, which would reduce roof space :)
     
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  7. DevilDamo

    DevilDamo

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    It probably does for most semi-detached and some detached buildings but not when you're talking about larger detached houses. I've done a lot of roof extensions (i.e. hip to gable and rear dormers) that have come under the 40 cu.m threshold for terraced houses.
     
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