Foundation

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Building a room to back of house 14x9 doing foundation myself, build said it should be 3 ft deep and 3ft wide, this sounds a little to big to me, someone said 2 ft width is enough but do go down 3 ft or until u hit hard ground, Main Q is the width is 3 ft to wide cheers
 
Be careful with this project you've undertaken mistakes made in the beginning can cost you much more money to rectify later.
If you know anybody in the building trade then ask for their help/advice I will be undertaking an extension of my own soon but am lucky enough to have Dad the builder managing the build.
Heres a handy reference for you and good luck with your build ;)

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Is the development exempt from planning permission or something? If not then you should follow the plans that were approved to the letter!
 
Generally, you will not need planning permission for:
  • Building an extension to the rear of the house which does not increase the original floor area of the house by more than 40 square metres and is not higher than the house. The extension should not reduce the open space at the back of the house to less than 25 square metres which must be reserved exclusively for the use of the occupants of your house. If your house has been extended before, the floor area of the extension you are now proposing and the floor area of any previous extension (including those for which you previously got planning permission) must not exceed 40 square metres. (There are also other height restrictions.)
  • Converting a garage attached to the rear or side of the house to domestic use so long as it has a floor area of less than 40 square metres. Building a garage at the back or side of a house so long as it does not extend out in front of the building line of the house and does not exceed 4 metres in height (if it has a tiled/slated pitched roof) or 3 metres (if it has any other roof type). This building will be exempt from planning permission once the floor area is limited to 25 square metres. Garages or sheds to the side of the house must match the finish of the house and may not be lived in, used for commercial purposes or for keeping pigs, poultry, pigeons, ponies or horses.
  • Building a front porch so long as it does not exceed 2 square metres in area and is more than 2 metres from a public road or footpath. If the porch has a tiled or slated pitched roof, it must not exceed 4 metres in height or 3 metres for any other type of roof.
  • Capped walls made of brick, stone or block, wooden fences but not security fences can be erected as long as they do not exceed 1.2 metres in height or 2 metres at the side or rear. Gates may be build provided they do not exceed 2 metres in height. Permission is always required to if you wish to widen or create new access to the public road.
  • A central heating system chimney, boiler house or oil storage tank (up to 3,500 litres capacity).
  • Car parking spaces, garden paths etc
  • A TV aerial on the roof so long as it is less than 6 metres higher than the roof
  • A satellite dish (up to 1 metre across the below the top of the roof) at the back or side of the house (a dish on the front needs planning permission). Only one dish may be erected on a house.
These are guidelines only; it is most important to check with your local authority before starting to make any changes
 
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