Extension Types & Possibilities

Single Storey Extension

When considering a single storey extension to your house it may be considered to be permitted development, not requiring an application for planning permission, provided certain limits and conditions are met.

The permitted development allowances described above apply to houses, not flats, maisonettes or other buildings. You should check with your Local Planning Authority whether permitted development rights apply with your property – some have been removed by an Article 4 directions. Sometimes property’s of certain types require additional permission for example if your house is listed or in a designated area.

  • Single Storey Extension

up to 20m2

single room

  • Single Storey Extension

20m2 to 40m2

made up of two rooms

  • Single Storey Extension

40m2 +

made up of two plus rooms

Two Storey Extension

An extension or addition to your house is considered to be permitted development, not requiring an application for planning permission, provided certain limits and conditions are met.

The permitted development allowances described above apply to houses, not flats, maisonettes or other buildings. You should check with your Local Planning Authority whether permitted development rights apply with your property – some have been removed by an Article 4 directions. Sometimes property’s of certain types require additional permission for example if your house is listed or in a designated area.

  • Two Storey Extension

up to 80m2

up to four rooms

  • Two Storey Extension

80m2 +

up to four rooms plus rooms

  • Other – Balcony / Loft Conversion etc

Please enquire for further information.

Is my proposal Even Possible?

Some points to consider before carrying out an extension project, please consider the below points. We offer a  initial consultation to help you decide on whether your proposed project is feasible and/or what style of extension would work best for you, your family and your property to fit within the environment sympathetically.

  1. Look at the % of ground that you would ideally like to extend on but be mindful that if you fill all amenity space with anew extension space the likelihood of approval will be slim. The extension must not exceed 50% of the existing floor plan when originally built.

  2. The extension will not be able to exceed a certain height or be located where neighbouring building light could be compromised.
  3. When adding additional space for example a conservatory the removal of any internal walls/windows and doors to the property will be prohibited due to Building Regulation Requirements due to heat loss.
  4. Natural light must be maintained to all habitable rooms.

  5. The ceiling height in your new extension should not be less than 2 meters. In rooms with sloping ceilings, the ceiling must be higher than 2 meters for 50% of the roof span.

  6. Consideration to be made to ensure that the privacy of your neighbours. For example windows to side elevations should have obscured glazing.
  7. All towns have a policy for which aids them to make decisions on applications for example: safety windows to side elevations.
  8. Consider the size of your garden as extending could make your garden quite small
  9. Consider how light will affect your proposed space and affect the mood of the space and warmth of natural sunlight
  10. Solar gain can be considered within the design to create designs that can reduce the solar glare and heat by over hangs or solar shading systems this can aid the welcome heat in the winter but reduce the discomfort in the summer