Extension Types Possibilities

Single Storey Extension

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

Permitted Development for single storey extension conditions:

  1. Designated land exterior cladding not permitted (Designated Land – designated land (Article 2(3)) includes national parks and the broads, Areas of Outstanding Natural Beauty, Conservation Area and World Heritage Sites)
  2. Designated land side extensions not permitted
  3. Rear extensions of more than one storey not permitted
  4. No more than half the area of land around the ‘original house'(means the house as it was first built or as it stood on 1st July 1948) would be covered by the additions or other buildings. (Sheds and other outbuildings must be included when calculating the 50% limit).
  5. Extension to the front or side elevation not permitted
  6. materials used in the exterior work to be similar in appearance to those on the exterior of the existing house.
  7. the width no more than half the width of the original house.
  8. maximum height of 4 meters
  9. extension to be within 2 meters of a boundary maximum eaves height no higher than 3 meters.
  10. extension must not extend beyond the rear wall of the original house by more than 4 meters if detached or 3 meters for a semi or terraced house/the limits are increased to 8 meters for a detached house or 6 meters for a semi or terraced house.(These increased limits are subject to the neighbour consultation scheme)
  11. extension to the rear to have a maximum height of 4 meters.

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, in a conservation area or in a designated area.

Two Storey Extension

An extension or addition to your house in the form of a two storey extension is considered to be permitted development, not requiring an application for planning permission, provided certain limits and conditions are met. This was brought into place in August 2020.

Permitted Development for two storey extension conditions:

  1. extensions of more than one storey are not permitted in designated areas.
  2. extensions and other buildings must not exceed 50% of the total area of land around the ‘original house’. Sheds and other outbuildings must be included when calculating the above 50% limit.
  3. maximum eaves and ridge height to be no higher than the existing house (exception to be made when the extension is to be within 2 meters of the boundary maximum height to be 3 meters.
  4. extension must not extend beyond the rear wall of the ‘original house’ by more than 3 meters or be within 7 meters of any boundary opposite the rear wall of the house.
  5. roof pitch should match the existing house as is practicably possible.
  6. materials used should be similar in appearance to those of the existing house.
  7. any upper floor windows within the wall or roof slope and on a side elevation must be obscure glazed and non openable unless the openable part is more than 1.7 meters above the floor of the room that it is installed.
  8. Balconies or verandas not permitted

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.

Loft Conversions

An extension or addition to your house in the form of a loft conversion is considered to Permitted development. not requiring an application for planning permission, provided certain limits and conditions are met.

Permitted Development for loft conversion conditions:

  1. loft conversions on designated land, listed buildings and conservation areas are not permitted.
  2. Additional roof space created must not exceed 40 cubic meters for terraced houses and 50 cubic meters for detached and semi detached properties. Any previous roof additions must be included within this volume allowance. 
  3. any extension to the loft space which alters the front plane of the existing roof slope fronting a highways is not permitted.
  4. materials must be similar in appearance to the existing house
  5. No part of the extension to be higher than the highest part of the existing roof.
  6. Verandas, balconies and raised platforms are not permitted.
  7. any side facing windows must obscure glazed and non openable unless the openable parts are over 1.7 meters from floor level.
  8. roof extensions apart from hip to gable ones to be set back 20cm from the original eaves. The 20cm distance is measured along the roof plane. The roof enlargement cannot overhang the outer face of the wall of the ‘original house’
  9. work on a loft or roof may affect protected species. A survey may be required and a licence may need to be issued.

Garage / Outbuilding Conversions

An extension or addition to your house in the form of a loft conversion is considered to be Permitted development. not requiring an application for planning permission, provided certain limits and conditions are met.

Permitted Development for two storey extension conditions:

  1. outbuildings to the side of the house are not permitted.
  2. outbuildings within  the grounds of a listed building are not permitted.
  3. In national parks, the broads, Areas of Outstanding Natural Beauty and World Heritage Sites the total area to be covered by any outbuildings more than 20 meters from any wall of the house must not exceed 10 square meters.
  4. outbuildings are not permitted if they are forward of the front elevation of the ‘original house’.
  5. outbuildings and other additions must not exceed 50% of the total area of the land around the ‘original house’. Sheds and all other outbuildings and extensions to the original house must be included when calculating this 50% limit.
  6. any new building must not be separate, self contained, living accommodation and must not have an microwave antenna.
  7. outbuildings must be single storey with a maximum eaves height of 2.5 meters and a maximum overalll height of 4 meters for a duel pitched roof or 3 meters in any other cases.
  8. if the outbuilding is within 2 meters of the property boundary the whole building should not exceed 2.5 meters in height.
  9. Balconies and Verandas are not permitted.
  10. Containers such as those used for domestic heating must not exceed 3500 litres capacity.

Conservatories

An extension or addition to your house in the form of a conservatory is considered to be Permitted development, not requiring an application for planning permission, provided certain limits and conditions are met

Permitted Development for Conservatories conditions:

  1. On designated land cladding of any part of the exterior of a dwelling (and extensions and/or conservatories) with stone, artificial stone, pebble dash, render, timber, plastic or tiles is not permitted development.
  2. On designated land conservatories extending beyond any side wall of the original house are not permitted development.
  3. Area Permitted – conservatories (including previous extensions) and other buildings must not exceed 50% of the total area of land around the original house. NOTE: sheds and other outbuildings must be included when calculating the above 50% limit.
  4. Conservatories to the principle (front) elevation or side elevation of the original house and fronting a highway are not permitted development.
  5. Side Conservatories must not have a width greater than half the width of the original house.
  6. conservatories to have a maximum height of four meters.
  7. if constructing a conservatory within 2 meters of the rear or side boundary the maximum eaves height is 3 meters to be classed as permitted
  8. Depth of rear conservatory must not extend beyond the rear wall of the original house: if in designated land by more than 4 meters if detached; or more than 3 meters for a semi or terraced property/the limits are increased to 8 meters for a detached house or 6 meters for a semi or terraced house.(These increased limits are subject to the neighbour consultation scheme)
  9. Height of conservatory must not exceed 4 meters.
  10. Maximum eaves height should be no higher than the eaves of the existing house. The tallest part of the conservatory must not extend higher than the roof ridge line of the existing house.

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
 

 

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