Basement and Loft Conversions Restrictions

Something that you probably think about when it comes to your UK home is the space available.

loft and basement conversions

It seems as if everyone is opting for basement and loft conversions, but what are the restrictions on these. Do you need planning permission before you can get to work? A registered building company will be able to advise you on the restrictions and regulations for loft or basement conversions. We have included some information below that might assist.

Loft conversions

  • There is normally no planning permission required for this type of home alteration if limits and conditions are adhered to. You will only need to obtain planning permission if you alter the roof space and it exceeds the following limits and conditions
  • No extensions are allowed beyond the plane of the existing roof slope.
  • For terraced houses there is a 40 cubic metres additional roof space volume allowance.
  • For detached and semi detached houses there is a 50 cubic metres additional roof space allowance.
  • Your extensions may not exceed the height of the highest point of the existing roof.
  • The materials used for the alterations must be similar to the appearance of the house.
  • Conversions and extensions may not include raised platforms, balconies or verandas.
  • Any openings must be 1.7m above the floor and any windows on the side need to be obscure-glazed.
  • Extensions to the roof are not allowed in certain areas – it is best to check with your builder.
  • Any roof enlargements made cannot overhang the outer face of the wall of the original house.
  • Allowed roof extensions must be set at least 20cm back from the original eaves.

Basement conversions

Basement conversions that require very little in terms of structural alterations will, in most cases, require no planning permit. You will however require planning permission for your basement conversion if you plan to carry out any of the following alterations:

  • Excavation to enlarge the basement or create a new basement space.
  • The alterations will change the external appearance of the house.
  • Addition of a light well.

Building regulations apply to basement conversions and include the following:

  • Provisions must be made for fire escapes, ventilations, damp control, water supplies and electrical wiring.
  • Underpinning and foundation work must be carried out by a professional and registered building company.
  • If your property shares walls with other properties, the Party Wall Act of 1996 must be adhered to.

To ensure that you are carrying out your loft and basement conversions according to the regulations in place, make sure that you consult with a professional building company in the UK. Contact us at OBC Building for more information, advice and guidance today.