Keeping your loft conversion within the law

You’ve decided on a loft conversion; you’re going to make the most of all that space in the roof to make an extra room – or maybe two – and can’t wait.  You’ve been in contact with Topflite Loft Conversions for a quote and you’re all set to go.

A loft conversion is usually considered a permitted development to a house and needs building regulations approval but not planning permission.  However it is best to check out our guidelines and then with your local council to make sure you have done everything you need to.

Building RegulationsIf you don’t have permission, when you come to sell you will not be able to class your loft conversion as an additional room and this will affect the selling price of your house.

Consider this list to stay within the planning regulations:

  • • It won’t increase your roof space by more than 40 m³ (terraced house)
  • • It won’t increase your roof space by more than 50 m³ (detached or semi-detached house)
  • • The extension won’t protrude beyond the slope of roof that faces the road
  • • … or above the height of the highest part of the roof
  • • Materials will be similar in appearance to those already in use
  • • The extension will not include balconies, verandas or raised platforms
  • • Any side-facing windows will be finished with obscure glazing
  • • Your area is not protected by any conservation order


Remember any previous roof extension measurements will be included in these regulations.  Topflite Loft Conversions will make sure that any work being carried out will be building regulations approved so that you know the following points are covered:

  • • The floor is structurally sound and can take the additional weight
  • • General stability of building is not at risk
  • • There is safe escape from fire
  • • New stairs are a safe design
  • • There is reasonable sound insulation from other parts of the house


All boxes checked, then you’re ready to go.  With more than 150 years experience between us Topflite Loft Conversions will have you converted in no time.  Visit our showroom or call us on FREEPHONE 0500 622 451 to discuss.

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